S-8363 Series
www.sii-ic.com
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz
PWM / PFM SWITCHABLE SWITCHING REGULATOR
© Seiko Instruments Inc., 2010 Rev.2.0_00
Seiko Instruments Inc. 1
The S-8363 Series is a CMOS step-up switching regulator which consists of a reference voltage source, an oscillation
circuit, an error amplifier, a ph ase com pensation circuit, a c urrent limit circuit, an d a start- up circ uit.
Due to the operation of the PWM / PFM switching control, pulses are skipped under the light load operation and the
S-8363 Series prevents d ecrease i n efficienc y cause d by IC’s op erating c u rrent.
The S-8363 Series is capable of start-up from 0.9 V (IOUT = 1 mA) by the start-up circuit, and is suitable for applications
which use one dr y cell.
The output voltage is freel y settable from 1. 8 V to 5.0 V b y ext ern al parts.
Ceramic capacitors can be used for output capacitor. Small packages SNT-6A and SOT-23-6 enable high-density
mounting.
Features
• Low operation voltage : Start-up from 0.9 V (IOUT = 1 mA) guaranteed
• Oscillation frequency : 1.2 MHz
• Input voltage range : 0.9 V to 4.5 V
• Output current : 300 mA (VIN = 1.8 V, VOUT = 3.3 V)
• Reference voltage : 0.6 V±2.5%
• Efficiency : 85%
• Soft start function : 1.2 ms typ.
• Low current consumption : During switching-off, 95 μA typ.
• Duty ratio : PWM / PFM switching contro l
max.88%
• Power-off function : Current consumption during po wer-off 3.0 μA max.
• Current limit circuit : limits the peak value of inductor current
• Nch power MOS FET ON resistance : 0.25 Ω typ.
• Start-up function : Operation with fixed dut y pu lse under the V OUT voltage of 1.4 V or less
• Lead-free, Sn 100%, halogen-free*1
*1. Refer to “ Product Name Structure” for details.
Applications
• MP3 players, digital a udio pl a yers
• Digital cameras, GPS, wireless transceiver
• Portable devices
Packages
• SNT-6A
• SOT-23-6
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
2
Block Diagram
Error Amplifier
CIN
VIN
VOUT
VOUT
CONT
VSS
VIN
ON/OFF
Interna l
Power Supply
ON/OFF
Circuit
Reference
Voltage
Source
PWM
Comparator
V
IN
Σ V
OUT
R
FB2
R
FB1
SD
+
−FB
Current
Limit Circuit
Oscillation
Circuit SLOPE
Compensation
STU Mode
Circuit
MUX +
−
Start-up
Circuit
L = 2.2 μH
C
OUT
10 μF
Switching
Control
Circuit
C
FB
Figure 1
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 3
Product Name Structure
Users can select the packages for the S-8363 Series. Refer to “1. Product name” regarding the contents of product
name, “2. Package” regarding the pack age dra wings an d “3. Product list” regarding the pr oduct typ e.
1. Product name
S-8363B - xxxx U 2
Environmental code
U: Lead-free (Sn 100%), halogen-free
Package name (abbreviation) and IC packing specification
*1
I6T1: SNT-6A, Tape
M6T1: SOT -23-6, Tape
*1. Refer to the tape spec ific atio n.
2. Package
Drawing code
Package name Package Tape Reel Land
SNT-6A PG006-A-P-SD PG006-A-C-SD PG006-A-R-SD PG006-A-L-SD
SOT-23-6 MP006-A-P-SD MP006-A-C-SD MP006-A-R-SD −
3. Product list
Table 1
SNT-6A SOT-23-6
S-8363B-I6T1U2 S-8363B-M6T1U2
Remark Please select products of environmental code = U for Sn 100%, haloge n-free products.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
4
Pin Configurations
Table 2 SNT-6A
Pin No. Symbol Description
1
FB Output voltage feedback pin
2
VSS GND pin
3
CONT External inductor con nection pin
4
VIN IC power supply pin
SNT-6A
Top view
1
2
3 4
6
5
5
VOUT Output volt ag e pin
6
OFF/ON Power-off pin
“H” : Power-on (normal operation)
“L” : Power-off (standby)
Figure 2
Table 3 SOT-23-6
Pin No. Symbol Description
1
OFF/ON Power-off pin
“H” : Power-on (normal operation)
“L” : Power-off (standby)
2
VOUT Output voltage pin
3
VIN IC power supply pin
4
CONT External induct or connecti on pin
5
VSS GND pin
6
FB Output voltage feedback pin
6 4
1 3 2
SOT-23-6
Top view
5
Figure 3
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 5
Absolute Maximum Ratings
Table 4 Absolute Maximum Ratings
(Ta = +25°C, VSS = 0 V unless otherwise specified)
Item Symbol Absolute Maximum Ratings Unit
VIN pin voltage VIN V
SS−0.3 to VSS+5.0 V
VOUT pin voltage VOUT V
SS−0.3 to VSS+6.0 V
FB pin voltage VFB V
SS−0.3 to VOUT+0.3 V
CONT pin voltage VCONT V
SS−0.3 to VSS+6.0 V
OFFON/ pin voltage OFF/ONV VSS−0.3 to VIN+0.3 V
SNT-6A 400*1 mW
Power Dissipation SOT-23-6 PD 650*1 mW
Operating ambient temperature Topr −40 to +85 °C
Storage temperature Tstg −40 to +125 °C
*1. When mounted on bo ar d
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
050
100
150
400
200
0
Power Dissipation (P
D
) [mW]
Ambient Temperature (Ta) [°C]
700
300
100 SNT-6A
SOT-23-6
500
600
Figure 4 Package Power Dissipation (When Mounted on Board)
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
6
Electrical Characteristics
Table 5 Electrical Characteristics
(VIN = 1.8 V, VOUT = 3.3 V, Ta = +25°C unless otherwise specified)
Item Symbol Conditions Min. Typ. Max. Unit
Test
Circuit
Operating start voltage*1 VST IOUT = 1 mA, VOUT(S)*2 = 3.3 V ⎯ ⎯ 0.9 V 2
Operating input voltag e VIN ⎯ ⎯ ⎯ 4.5 V 2
Output voltage range VOUT(R) ⎯ 1.8 ⎯ 5.0 V 2
FB voltage VFB ⎯ 0.585 0.600 0.615 V 1
FB voltage temperature
coefficient ΔVFB
ΔTa
Ta = −40°C to +85°C ⎯ ±100 ⎯ ppm/°C1
FB pin input current IFB V
OUT = 1.8 V to 5.5 V, FB pin −0.1 ⎯ ＋0.1 μA 1
IIN1 ⎯ 6 15 μA 1 Current consumption dur in g
operation ISS1 During switching, at no load
VFB = VFB(S)*3 × 0.95 ⎯ 450 650 μA 1
IIN2 ⎯ 6 15 μA 1 Current consumption dur in g
switching off ISS2 During switching sto p
VFB = VFB(S)× 1.1 ⎯ 95 150 μA 1
Current consumption dur in g
power-off ISSS OFF/ONV= 0 V,
VIN = VOUT = 4.5 V ⎯ ⎯ 3.0 μA 1
Oscillation frequenc y fOSC ⎯ 1.0 1.2 1.4 MHz 2
Maximum duty ratio MaxDuty VFB = VFB(S) × 0.95 82 88 94 % 2
PWM / PFM switching dut y r atio PFMDuty ⎯ ⎯ 13 ⎯ % 2
Power MOS FET ON resistance*4 RNFET ⎯ ⎯ 0.25 ⎯ Ω 1
Power MOS FET leakage cu rrent ILSW OFF/ONV= 0 V ⎯ 0.01 0.5 μA 1
Limited current ILIM
⎯ 0.9 1.1 1.3 A 3
High level inpu t voltag e VSH VIN = 1.8 V to 4.5 V, OFFON/ pin 0.75 ⎯ ⎯ V 1
Low level input voltag e VSL VIN = 1.8 V to 4.5 V, OFFON/ pin ⎯ ⎯ 0.25 V 1
High level input current ISH VIN = 1.8 V to 4.5 V, OFFON/ pin −0.1 ⎯ 0.1 μA 1
Low level input current ISL VIN = 1.8 V to 4.5 V, OFFON/ pin −0.1 ⎯ 0.1 μA 1
Soft-start time*5 tSS ⎯ 0.6 1.2 1.8 ms 2
*1. This is the guaranteed value measured with external parts shown in “Table 6 External Parts List” and with test
circuits shown in Figure 6. The operating start voltage varies largely depending on diode’s forward voltage. Perform
sufficient evaluation with actual applicati on.
*2. VOUT(S) can be set by the ratio of VFB value and the output volta ge setting res istors (RFB1, RFB2). For details, refer to “
External Parts Selection”.
*3. VFB(S) is a setting value for FB voltage.
*4. Power MOS FET ON resistance lar gel y var ies depen ding o n the VOUT voltage.
*5. This is when the VOUT voltage startups from the STU release voltage or more. The soft-start time largely varies
depending on the load current and the input voltage when the S-8363 Series startups from the STU release voltage
or less, because the S-8363 Series once enters the start-up mode. Refer to “ 2. Low voltage start-up” for STU
release voltage.
External Parts List When Measuring Electrical Characteristics
Table 6 External Parts List
Element name Symbol Constants Manufacturer Part number
Inductor L 2.2 μH TDK Corporation VLF302510
Diode SD
－ TOSHIBA CORPORATION CRS08
Input capacitor CIN 1 μF TAIYO YUDEN Co., Ltd. EMK107B7105KA
Output capacitor COUT 10 μF TAIYO YUDEN Co., Ltd. LMK212BJ106KD
FB pin capacitor CFB 47 pF TA IYO YUDEN Co., Ltd. UMK10 5CH4 70JV
Output voltage setting resisto r 1 RFB1 68 kΩ ROHM Co., Ltd. MCR03 series
Output voltage setting resisto r 2 RFB2 15 kΩ ROHM Co., Ltd. MCR03 series
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 7
Test Circuits
1.
S-8363
Series
A
C
IN
CONTFB
VSS
VIN
A ON/OFF
VOUT
A
C
OUT
AA
Figure 5
2.
S-8363
Series
C
IN
CONT
FB
VSS
VIN
ON/OFF ↓
L
R
FB1
R
FB2
C
FB
C
OUT
V
SD V
OUT
I
OUT
VOUT
Figure 6
3.
CONT
FB
VSS
ON/OFF
C
OUT
VOUT
C
OUT
C
IN
S-8363
Series
VIN
Figure 7
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
8
Operation
1. Switching control method
The S-8363 Series switching regulator automatically switches between the pulse width modulation method (PWM)
and pulse frequency modulation method (PF M) according to the lo ad c urrent.
A low ripple power can be supplied by operating on PWM control for which the pulse width changes up to 88% in
the range where the o utput lo ad curr ent is la rge.
The S-8363 Series operates on PFM control when the output load current is small and the pulses are skipped
according to the amount of the load current. Therefore, the oscillation circuit intermittently oscillates, reducing the
self-current consumption. This prevents decrease in efficiency when the output load current is small. The ripple
voltage during the PFM control is very small, so that the S-8363 Series realizes high efficiency and the low-noise
power supply.
The point at which PWM control s witches to PFM control varies dependi ng on the ext ernal eleme nt (inductor, diode,
etc.), input voltage value, and output voltage value, and this method achieves high efficiency in the output load
current of about 100 μA.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 9
2. Low voltage start-up
2. 1 Start-up circuit
The S-8363 Series can startup from 0.9 V. When the VOUT voltage at OFF/ON = “H” does not reach the STU
release voltage, the start-up circuit starts the operation and outputs the fixed duty pulse to the CONT pin. By
this, the VOUT voltage starts step-up. After that, the VOUT voltage reaches the ST U release voltage and the ST U
mode circuit is set in STU release condition, therefore, the switching control circuit starts stable operation due
to the soft-start function. Simultaneously, the start-up circuit is set in disable condition, so that the S-8363
Series prevents exc essive cu rrent co nsumption.
2. 2 Start-up mode (STU mode) circuit
The STU mode circuit monitors the VOUT voltage, and switches the operation modes between start-up period
and normal control period of the switching control circuit. The STU release voltage is internally fixed at 1.4 V
(typ.), and has hysteresis of approx. 0.15 V. When the VOUT voltage decreases to 1.25 V (typ.) from release
condition, the STU mode circ uit is set in the STU detection condition, shif ting to the start-up period. Several μs
to several ten μs is taken to shift from STU release to PWM release. During this the step-up operation is not
performed, therefore, the VOUT voltage may l argel y d ecreas e depe ndi ng o n the siz e of load.
During applying OFF/ON = “L”, the STU mode circuit is set in disable condition, so that the S-8363 Series
prevents excessive current c onsu mption.
CONT
VOUT
MUX
Start-up
Circuit
VIN
VOUT
VIN
STU Mode Circuit
V
D
Load
SD
L = 2.2 μH
C
OUT
10 μF
Switching
Control Circuit
VSS
Figure 8 Start-up Circuit
Time [s]
Switching de lay
Output voltage
(VOUT)
Start-up period
CONT voltage
(VCONT)
PWM control period
STU detection
STU release
Figure 9 Start-up Sequence
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
10
2. 3 Schottky barrier diode
A schottky barrier diode (SD) is necessary to operate the S-8363 Series. The VOUT pin also works as the
power supply pin. T he voltage applied on the VOUT pin when OFF/ON = “L” is VIN − VD. VD is forward voltage
for step-down of SD, and l argely var ies depend ing on the f or ward current I f of SD and ambient temper ature, but
Vd is approx. 0.2 V to 0.5 V.
When the S-8363 Series startups from 0.9 V, use a SD with specially low VD. When using CRS08 for the
S-8363 Series, start-up is gua rante ed when T a = +25°C an d a load c urren t of 1 mA.
Satisfy the follo wing conditio ns when usin g other SD s.
• Low forward voltage (VD)
• High switching speed
• Reverse withstand v oltage of VOUT + spike voltage or mor e
• Rated current of IPK or more
Table 7 Typical Schottky Diodes
Manufacturer Name
CRS02
TOSHIBA CORPORATION CRS08
RB161M-20TR
RB051LA-40TR
RB070M-30TR
ROHM Co., Ltd.
RB161SS-20T2R
Remark Generally, in diodes with low forward volage VD, reverse leakage current Ir tends to increases.
Especially, increase of Ir in high temperature is significant. To prevent decrease in efficiency, choose a
diode with low Ir when low voltage start-up is unnecessar y.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 11
3. Soft-start function
The S-8363 Series has the built-in soft-start circuit. When power-on (connecting OFF/ON to VIN) or after
start-up at OFF/ON = “H”, the output voltage (VOUT) gradually rises, suppressing rush current and overshoot of
the output voltage. In the S-8363 Series, the soft-start time (tss) is from start-up to the time to reach 90% of the
VOUT output voltage setting value (VOUT(S)). A reference voltage adjustment method is adopted as the soft-start
method, the reference voltage gradually rises from 0 V simultaneously with start of the soft-start. The soft-start
circuit has two operation mo d es which is selected accor ding to the V OUT volta ge at start- up.
3.1 VOUT voltage at start-u p > STU release voltage
The soft-start starts when the reference v oltage gr adual l y rises after OFF/ON = “H”.
Reference voltage
from
error amplifier
Soft -start t ime (t
ss
)
Time [s]
0 V
0 V
V
OUT
× 0.90
0 V
Output voltage
(V
OUT
)
Input voltage
(V
IN
)
Soft-start period
ON/OFF
voltage
STU release
0 V
Figure 10
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
12
3. 2 VOUT voltage at st art-u p < ST U release voltage
After OFF/ON =“H”, step-up starts by the start-up operation. When the VOUT voltage reaches the STU release
voltage, the soft-start starts.
Since the length of the start-up period largely varies depending on the input voltage, load current, external parts
and ambient temperature, the soft-start time varies according to them. Perform sufficient evaluation with actual
application.
Reference voltage
from
error amplifier
Soft-start time (t
ss
)
Time [s]
0 V
0 V
V
OUT
× 0.90
0 V
Output voltage
(V
OUT
)
Input voltage
(V
IN
)
Soft-start period
ON/OFF
voltage
Start-up period
STU release
0 V
Figure 11
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 13
3. 3 Condition of performing soft-start again
The condition to reset after the refer enc e vo lt age onc e rise s (reference v oltag e from err or ampl ifier = 0 V) is to set
the OFF/ON pin voltage to “L”. S etting OFF/ON = “H” starts soft-start again. When the VOUT voltage drops and
decreases more than th e STU detection voltage by an ove rload, the soft-start circuit shifts to the start-up period.
When the VOUT voltage is rest ored by releas i ng ov erl oad, the soft-start function is performed.
If the VOUT voltage is not decreased less than the STU detection voltage, the soft-start function is not performed
when restoration.
Reference
voltage from
error amplifier
0 V
0 V
Output voltage(V
OUT
)
ON/OFF
voltage
Time [s]
0 V
STU release
STU detection
<1> Start-up period
<2> Soft-start period
<3> Normal operation period
<4> Reset period
<1> <1> <1> <2> <2> <2><3> <3> <4><4>
0 A
Load current
(I
OUT
)
V
OUT(S)
Figure 12 Reset Condition for Soft-Start
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
14
4. Power-off pin
This pin stops or starts step-up op erations.
When the OFF/ON pin is set to the low leve l, the inter nal driv er of the CONT pin is turne d off and all i nternal circ uits
stop substantially r ed ucing the curr ent con sumption.
The OFF/ON pin is set up as shown in Figure 13 and is internally pulled down by using the depression transistor,
so all circuits stop even if this pin is floating. Do not apply a voltage of between 0.25 V and 0.75 V to
the OFF/ON pin becaus e applyi ng suc h a voltag e in creas es the curr ent consum ption. If the OFF/ON pin is not used,
connect it to the VIN pin. Table 8
OFFON/ pin CR oscillation
circuit Output voltage
“H” Operates Set value
“L” Stops VIN − VD
VIN
ON/OFF
VSS
VIN
Figure 13
5. Current limit circuit
A current limit circuit is built in the S-8 363 Series.
The current limit circuit monitors the current that flows in the Nch power MOS FET and limits current in order to
prevent thermal destruction of the IC due to an o verl oad or magnetic sa turation of the induct or.
When a current exceeding the current limit detection value flows in the Nch power MOS FET, the current limit
circuit operates and turns off the Nch power MOS FET since the current limit detection until one clock of the
oscillator ends. The Nch power MOS FET is turned on in the next clock and the current limit circuit resumes
current detection operation. If the value of the current that flows in the Nch power MOS FET remains the current
limit detection value or more, the current limit circuit functions again and the same operation is repeated. Once
the value of the current that flows in the Nch power MOS FET is lowered up to the specified value, the normal
operation status restores.
The current limit detection value is fixed to 1.1 A (typ.) in the IC. However, under the condition that ON duty is
small, between the detection delay time of the current limit circuit and the ON time of the Nch power MOS FET,
the difference is small. Therefore, the current value which is actually limited is increased. Usually, when the
difference between the VIN pin and VOUT pin is small, on duty is decreased and the limited current value is
increased.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 15
Operation Principles
The S-8363 Series is a st ep-u p s witching regulat or. Figure 14 shows the basic circuit diagram.
Step-up switching regulators start current suppl y by the input voltage (VIN) when the Nch power MOS FET is turned
on and holds energy in the inductor at the same time. When the Nch power MOS FET is turned off, the CONT pin
voltage is stepped up to d ischarge the energy he ld in the induct or and the current is dis charged to VOUT through the
diode. When the discharged current is stored in COUT, a voltage is generated, and the potential of VOUT increases
until the voltage of the FB pin reaches the s ame potent ial as the i nternal reference v oltage.
For the PWM control method, the switching frequency (fOSC) is fixed and the VOUT voltage is held constant
according to the ratio of the ON time and OFF time (ON duty) of th e Nch power MOS FET in each period.
In the PWM control method, the VOUT voltag e is held c onst ant by control ling the ON tim e.
In the PFM control method, the Nch po wer MOS FET is turned on b y fixed duty. W hen ener gy is disch arged to VOUT
once and the VOUT potential exceeds the set value, the Nch power MOS FET stays in the off status until VOUT
decreases to t he set value or less due to t he load dischar ge. Time VOUT decreases to t he set value or less depe nds
on the amount of load curr ent, so, the s witching freque nc y v aries de pendi n g on this curr e nt.
VSS
FB
CONT
COUT
RL
VOUT
SD
IOUT
I2
VIN
L
I1
Nch power
MOS FET
Figure 14 Basic Circuit of Step-up Switching Regulator
The ON duty in the c urrent continuous m ode can be calc ul ated by usin g the equ ation belo w. Use the S -8363 Ser ies
in the range where the ON dut y is less than the maxim um dut y.
The maximum dut y is 8 8% (t yp.).
ON duty = ⎝
⎛⎠
⎞
1 − VIN
VOUT + VD*1 × 100 [%]
*1. VD : Forward voltage of di ode
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
16
1. Continuous current mode
The following explains the current that flows into the inductor when the step-up operation stabilizes in a certain
status and IOUT is sufficiently large.
When the Nch power MOS FET is turned on, current (I1) flows in the direction shown in Figure 14. The inductor
current (IL) at this time gradually increases in proportion with the ON time (tON) of the Nch power MOS FET, as
shown in Figure 15.
Current change of inductor within tON :
ΔIL(ON) = IL max. − IL min.
=
VIN
L × tON
When the Nch power MOS FET is turned off, the voltage of the CONT pin is stepped up to VOUT + VD and the
voltage on both en ds of the induct or becom es VOUT + VD − VIN. However, it is assumed here that VOUT >> VD and VD
is ignored.
Current change of inductor within tOFF :
ΔIL(OFF) = VOUT − VIN
L × tOFF
The input power equals the o utput power in an ideal situation where there is no loss by compo nents.
IIN(AV) :
PIN = POUT
IIN(AV) × VIN = IOUT × VOUT
∴IIN(AV) = VOUT
VIN × IOUT ....................... (1)
The current that flows in the inductor consists of a ripple current that changes due to variation over time and a
direct current.
From Figure 15 :
IIN(AV) :
IIN(AV) = IIN(DC) + ΔIL
2
= IIN(DC) + VOUT − VIN
2 × L × tOFF
= IIN(DC) + VIN
2 × L × tON.............. (2)
Above, the continuous mode is the operation mode when IIN(DC) > 0 as shown in Figure 15 and the inductor current
continuously flo ws.
While the output current (IOUT) continues to decrease, IIN(DC) reaches 0 as shown in Figure 16. This point is the
critical point of the continuo us mode.
As shown in equatio ns (1) an d (2), the direc t current com p onent (IIN(DC)) depends on IOUT.
IOUT(0) when IIN(DC) reaches 0 (critical point) :
IOUT(0) = tON × VIN2
2 × L × VOUT
When the output current decrease s below IOUT(0), the current flowing in the inductor stops flo wing in the tOFF per iod
as shown in Figure 17. This is the discontinuous mode.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 17
t
IIN(DC)
tOFF tON
t = 1 / fOSC
IL min.
IL max.
IIN(AV)
IL
Figure 15 Continuous Mode (Current Cycle of Inductor Current IL)
t
tOFF tON
t = 1 / fOSC
IL min.
IL max.
IL
Figure 16 Cr itical Point (Cu rrent C ycle o f Indu ctor Current IL)
t
tOFF tON
t = 1 /
f
OSC
IL min.
IL max.
IL
Figure 17 Discontinuous Mode (Current Cycle of Inductor Current IL)
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
18
External Parts Selection
1. Inductor
The recommended L val ue of the S-8 363 Se ries is 2. 2 μH.
Caution When selecting an inductor, be careful about its allowable current. If a current exceeding the
allowable current flows through the inductor, magnetic saturation occurs, substantially lowering
the efficiency and destroying ICs due to large current. Therefore, select an inductor such that IPK
does not exceed the allowable current. The following equations express IPK in the ideal statuses
in the discontinuous and continuous modes :
IPK = 2 × IOUT × (VOUT + VD*2 − VIN)
fOSC*1 × L (Discontinuous mode)
IPK = VOUT + VD*2
VIN × IOUT + (VOUT + VD*2 − VIN) × VIN
2 × (VOUT + VD*2) × fOSC*1 × L (Continuous mode)
*1. fOSC : oscillation frequency
*2. VD is the forward voltage of a dio de. T he ref erence va lue i s 0.4 V.
However, current exceeding the above eq uatio n flo ws because c on dition s are pr acticall y not id eal.
Perform sufficient evaluatio n with act ual ap plicati on.
Table 9 Typical Inductors
Manufacturer Name L value Direct resistor Rated current Size (L × W × H）[mm]
VLF302510-2R2M 2.2 μH 0.084 Ω max. 1.23 A max. 3.0 × 2.5 × 1.0
VLS3010T-2R2M 2.2 μH 0.116 Ω max. 1.2 A max. 3.0 × 3.0 × 1.0
VLS201610E 2.2 μH 0.276 Ω max. 0.94 A max. 2.0 × 1.6 × 0.95
TDK Corporation
MLP2012S2R2M 2.2 μH 0.300 Ω max. 0.8 A max. 2.0 × 1.25 × 1.0
Coilcraft, Inc LPS3010-222ML 2.2 μH 0.220 Ω max. 1.3 A max. 3.0 × 3.0 × 1.0
LQM2HPN2R2MG0 2.2 μH 0.080 Ω±25% 1.3 A max. 2.5 × 2.0 × 1.0 Murata Manufacturin g
Co., Ltd. LQH3NPN2R2NG0 2.2 μH 0.140 Ω±20% 1.25 A max. 2.7 × 3.0 × 1.0
NR3010T2R2M 2.2 μH 0.114 Ω max. 1.1 A max. 3.0 × 3.0 ×1.0
NR4010T2R2N 2.2 μH 0.180 Ω max. 1.15 A max. 4.0 × 4.0 ×1.0
TAIYO YUDEN Co., Ltd. BRL2518T2R2M 2.2 μH 0.1755 Ω max. 0.85 A max. 2.5 × 1.8 × 1.2
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 19
2. Diode
Use an externally mounted t hat meets th e follo wing con dit ions.
• Low forward voltage (Schott k y barrier di ode or simi lar t ypes)
• High switching speed
• Reverse withstand v oltage of VOUT + spike voltage or mor e
• Rated current of IPK or more
3. Input capacitor (CIN) and output capacitor (COUT)
To improve efficiency, an i nput capacitor (CIN) lowers the power supply impedanc e and averages the input current.
Select CIN according to the impedance of the power supply used. The recommended capacitance is 1 μF or more
for the S-8363 Series.
An output capacitor (COUT), which is used to smooth the output voltage, requires a capacitance larger than that of
the step-down type because the current is intermittently supplied from the input to the output side in the step-up
type. When the output voltag e is low or the load current is large, enlarging a n output capacitance va lue is required.
Moreover, when the output voltage is high, connecting a 0.1 μF ceramic capacitor in parallel is required. Mount
near a VOUT pin as possi ble.
The indication of an o utput capacit or to the setting v alue of V OUT voltage is sho wn in the t able 10. P erform thorough
evaluation usin g an ac tual ap plicatio n to set the co nstant when sel ecting parts.
A ceramic capacitor can be used for b oth the in put and o ut put.
Table 10 Recommended Output Capacitance
VOUT voltage Output capacitor (COUT)
< 2.5 V 10 μF × 2
2.5 V to 4.0 V 10 μF
4.0 V < 10 μF + 0.1 μF
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
20
4. Output voltage setting resistors (RFB1, RFB2), capacitor for phase compensation (CFB)
For the S-8363 Series, VOUT can be set to any value by using external divider resistors. Connect the divider
resistors between the VOUT and VSS pi ns.
Because VFB = 0.6 V typ., VOUT can be calculated by usi n g the fol lo wing equ ati on :
V
OUT = RFB1 + RFB2
RFB2 × 0.6
Connect divider resistors RFB1 and RFB2 as close to the IC as possible to minim ize the effects of noise. If noise has
an effect, adjust the values of RFB1 and RFB2 so that RFB1 + RFB2 < 100 kΩ.
CFB, which is connected in pa rall el with RFB1, is a capacitor for pha se com pens ation.
By setting the zero point (the phase feedback) by adding capacitor CFB to output voltage setting resistor RFB1 in
parallel, the phase margin increases, improving the stability of the feedback loop. To effectively use the feedback
portion of the phase bas ed on the zero point, defin e CFB by using the followin g eq uat ion :
C
FB ≅ L × COUT
3 × RFB1 × VOUT
VDD
This equation i s onl y a guid e.
The following explains the optimum setti ng.
To efficiently use the feedback portion of the phase based on the zero point, specify settings so that the phase
feeds back at the zero point frequency (fzero) of RFB1 and CFB according to the phase delay at the pole frequency
(fpole) of L and COUT. The zero point frequenc y is gen era lly set slig htly hig her than th e pol e frequency.
The following equations are used to determine the pole frequency of L and COUT and the zero point frequency set
using RFB1 and CFB.
fpole ≅ 1
2 × π × L × COUT × VDD
VOUT
f
zero ≅ 1
2 × π × RFB1 × CFB
The transient response can be improv ed by setting the zero point frequenc y in a lower frequency range. If, ho wever,
the zero point frequency is set in a significantly lo wer range, the gain increases in the range of high frequenc y and
the phase margin decreases. This might result in unstable operation. Determine the proper value after sufficient
evaluation with actual application.
The typical constants b ased on our eva luati on ar e sho wn in Table 11.
Table 11 Example of Constant for External Parts
VOUT(S) [V] VIN [V] RFB1 [kΩ] RFB2 [kΩ] CFB [pF]
1.8 1.2 30 15 82
2.48 1.2 47 15 68
3.32 1.8 68 15 47
4.2 1.8 90 15 39
5.0 1.8 110 15 39
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 21
Standard Circuit
Error Amplifier
CIN
VIN
VOUT
VOUT
CONT
VSS
VIN
ON/OFF
Internal
Power Supply
ON/OFF
Circuit
Switching
Control
Circuit Reference
Voltage
Source
PWM
Comparator
VIN
Σ
VOUT
SD
+
−
FB
Current
Limit Circuit
Oscillation
Circuit SLOPE
Compensation
STU Mode
Circuit
MUX
+
−
Start-up
Circuit
L = 2.2 μH
C
OUT
10
μ
F
Ground point
CFB
C
OUT
0.1
μ
F
RFB1
RFB2
Figure 18
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using an actual application to set the constants.
Precaution
• Mount external capacitors and inductor as c lose as possib le to the IC. Set single point groun d.
• Characteristics rippl e voltage and spike noise occur in IC c ontaining switching regul ators. Moreover rush current
flows at the time of a power supply injection. Because these largely depend on the inductor, the capacitor and
impedance of power supply used, perform sufficient evaluation with actual application.
• The 0.1 μF capacitor connected between the VOUT and VSS pins is a bypass capacitor. It stabilizes the po wer
supply in the IC when application is used with a heavy load, and thus effectively works for stable switching
regulator operatio n. Allocate the b ypass capacit or as cl os e to the IC as possi bl e, prioritized ov er oth er parts.
• Although the IC contai ns a static electricity protection circuit, static electricit y or voltage that exceeds the limit of
the protection circuit shou ld not be app lied.
• The power dissipat ion of the IC greatly varies depe nding on the size and mater ial of the board to be connected.
Perform sufficient evaluatio n usin g an actu al ap plic ation b ef ore desig ning.
• SII claims no responsibility for any disputes arising out of or in connection with any infringement by products
including this IC of patents owned b y a third part y.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
22
Application Circuits
Application cir cuits ar e e xam ples. T hey ma y always not guarantee successful o per atio n.
1. External parts for application circuits
Table 12 Ch aracteristic s of Extern al Pa rts
Part Part Name Manfuacturer Characteristics
VLF302510 2.2 μH, DCR*1 = 0.084 Ω, IMAX*2 = 1.23 A,
L × W×H = 3.0 × 2.5 × 1.0 mm
VLS201610E 2.2 μH, DCR*1 = 0.276 Ω, IMAX*2 = 0.94 A,
L × W × H = 2.0 × 1.6 × 0.95 mm
MLP2012S
TDK Corporation
2.2 μH, DCR*1 = 0.300 Ω, IMAX*2 = 0.8 A,
L × W × H = 2.0 × 1.25 × 1.0 mm
Inductor
BRL2518T2R2M TAIYO YUDEN Co., Ltd. 2.2 μH, DCR*1 = 0.1755 Ω, IMAX*2 = 0.85 A,
L × W × H = 2.5 × 1.8 × 1.2 mm
CRS02 VF*3 = 0.4 V typ., IF*4 = 1.0 A, VR*5 = 30 V,
L × W × H = 3.5 × 1.6 × 1.08 mm
CRS08 TOSHIBA CORPORATION VF*3 = 0.32 V typ., IF*4 = 1.5 A, VR*5 = 30 V,
L × W × H = 3.5 × 1.6 × 1.08 mm
RB070M-30TR
RB051LA-40TR
VF*3 = 0.44 V typ., IF*4 = 1.5 A, VR*5 = 30 V,
L × W × H = 3.5 × 1.6 × 0.9 mm
VF*3 = 0.35 V max., IF*4 = 3.0 A, VR*5 = 20 V,
L × W × H = 4.7 × 2.6 × 1.05 mm
RB161M-20TR
Diode
RB161SS-20T2R
ROHM Co., Ltd. VF*3 = 0.31 V typ., IF*4 = 1.0 A, VR*5 = 20 V,
L × W × H = 3.5 × 1.6 × 0.9 mm
VF*3 = 0.42 V, IF*4 = 3.0 A, VR*5 = 20 V,
L × W × H = 1.6 × 0.8 × 0.603 mm
LMK212BJ106KD 10 μF, EDC*6 = 10 V, X5R,
L × W × H = 2.0 × 1.25 × 0.95 mm
EMK107B7105KA T AIYO YUDEN Co., Ltd. 10 μF, EDC*6 = 16 V, X7R,
L × W × H = 1.6 × 0.8 × 0.90 mm
C1608X5R0J106M 10 μF, EDC*6 = 6.3 V, X5R,
L × W × H = 1.6 × 0.8 × 0.9 mm
Capacitor
C1608X7R1C 1 05K TDK Corporation 1 μF, EDC*6 = 16 V, X7R,
L × W × H = 1.6 × 0.8 × 0.9 mm
* 1. DCR : DC resi stance
* 2. IMAX : Maximum allowable current
* 3. VF : Forward voltage
* 4. IF : Forward current
* 5. VR : Reverse voltage
* 6. EDC : Rated voltage
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 23
2. A power supply started by 0.9 V
Following shows a power supply example which starts up by using the final voltage (0.9 V) of dry cells and its
characteristics.
L
S-8363
Series
VDD
VSS
ON/OFF FB
C
OUT
R
FB1
R
FB2
C
FB
V
OUT
C
IN
SD
CONTVOUT
0.1
μ
F
Figure 19 Circuit Example (For a power supply started by 0.9 V)
Table 13 Ext ern al Parts E x ampl es (Fo r a power supply start ed by 0.9 V)
Condition Output
Voltage IC Product
Name L Product
Name SD Product
Name COUT Product Name RFB1 R
FB2 C
FB
1 3.3 V S-8363B VLF302510 RB161M-2 0T R LMK212BJ106KD 68 kΩ 15 kΩ 47 pF
2 3.3 V S-8363B VLF302510 RB051L A-40T R LMK212BJ106KD 68 kΩ 15 kΩ 47 pF
3 3.3 V S-8363B VLF302510 RB070M-3 0T R LMK212BJ106KD 68 kΩ 15 kΩ 47 pF
4 3.3 V S-8363B VLF302510 RB161SS- 20T2R LMK212BJ106KD 68 kΩ 15 kΩ 47 pF
5 3.3 V S-8363B VLF302510 CRS02 LMK212BJ106KD 68 kΩ 15 kΩ 47 pF
6 3.3 V S-8363B VLF302510 CRS08 LMK212BJ106KD 68 kΩ 15 kΩ 47 pF
Caution The above connection will not guarantee successful operation. Perform thorough evaluation using an
actual application to set the constant.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
24
3. Output characteristics of power supply started by 0.9 V
Following shows the (1) Load current (IOUT) vs. Operating start voltage (VST), (2) Temperature (Ta) vs. Operating
start voltage (VST), (3) Load current (IOUT) vs. Efficiency (η), (4) Load current (IOUT) vs. Output voltage (VOUT),
characteristics for conditions 1 to 6 in Table 13.
(1) Load current (IOUT) vs. Operating start voltage (VST) (2) Temperature (Ta) vs. Operating start voltage (VST)
10
1100
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
V
ST
[V]
I
OUT
[mA]
Condition
3
Condition
5
Condition
6
Condition 2 Condition 4
Condition 1
0.4
1.1
Ta [°C]
−
40
0.5
0.6
0.7
0.8
0.9
1.0
V
ST
[V]
857550250
−
25
Condition
1
Condition
4
Condition
2
Condition
5
Condition
3
Condition
6
(3) Load current (IOUT) vs. Efficiency (η) (4) Load current (IOUT) vs. Output voltage (VOUT)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
Condition
2
Condition
3
Condition
1
Condition
4
Condition
6
Condition
5
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
Condition
4
Condition
5
Condition
2
Condition
6
Condition
3
Condition
1
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 25
4. Super-small power supply
Following shows a circuit e xampl e which gi ves top pr iori t y to reduc e the im plem ent atio n area by using the small
external parts and its characteristics.
L
S-8363
Series
VDD
VSS
ON/OFF FB
C
OUT1
R
FB1
R
FB2
C
FB
V
OUT
C
IN
SD
CONTVOUT
C
OUT2
Figure 20 Circuit Example (For super-small power supply)
Table 14 External Parts Examples (For super-small power supply)
Condition Output
Voltage IC Product
Name L Product
Name SD Product
Name C
OUT1
C
OUT2
R
FB1
R
FB2
C
FB
1 1.8 V S-8363B MLP2012S RB161SS-20 C1608X5R0J106M C1608X5R0J106M
30 k
Ω
15 k
Ω
82 pF
2 3.3 V S-8363B MLP2012S RB161SS-20 LMK212BJ106KD 0.1
μ
F
68 k
Ω
15 k
Ω
47 pF
3 1.8 V S-8363B VLS201610E RB161SS-20 C1608X5R0J106M C1608X5R0J106M
30 k
Ω
15 k
Ω
82 pF
4 3.3 V S-8363B VLS201610E RB161SS-20 LMK212BJ106KD 0.1
μ
F
68 k
Ω
15 k
Ω
47 pF
5 1.8 V S-8363B BRL2518T2R2M RB161SS-20 C1608X5R0J106M C1608X5R0J106M
30 k
Ω
15 k
Ω
82 pF
6 3.3 V S-8363B BRL2518T2R2M RB161SS-20 LMK212BJ106KD 0.1
μ
F
68 k
Ω
15 k
Ω
47 pF
Caution The above connection will not guarantee successful operation. Perform thorough evaluation using an
actual application to set the constant.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
26
5. Output characteristics of super-small power supply
Following shows the output current (IOUT) vs. efficiency (η), output current (IOUT) vs. output voltage (VOUT), and
output current (IOUT) vs. ripple voltage (Vr) ch aracter istics for cond itions 1 t o 6 in Table 14.
Condition 1
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
V
IN
= 0.9 V
VIN = 1.2 V
VIN = 1.5 V
0.01 1000
1.90
1.70
1.80
1.84
1.86
1.76
1.72
1.74
1.78
1.82
1.88
0.1 1 10 100
I
OUT
[mA]
V
OUT
[V]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.5 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
IOUT [mA]
V
r
[
mV
]
V
IN
= 1.5 V
V
IN
= 1.2 V
V
IN
= 0.9 V
Condition 2
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
Vr [
mV
]
VIN = 3.0 V
VIN = 2.4 V
VIN = 1.8 V
VIN = 1.2 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 27
Condition 3
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 1.2 V
VIN = 0.9 V
VIN = 1.5 V
0.01 1000
1.90
1.70
1.80
1.84
1.86
1.76
1.72
1.74
1.78
1.82
1.88
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.5 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
IOUT [mA]
V
r
[
mV
]
V
IN
= 1.5 V
V
IN
= 1.2 V
V
IN
= 0.9 V
Condition 4
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
Vr [
mV
]
VIN = 3.0 V
VIN = 2.4 V
VIN = 1.8 V
VIN = 1.2 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
28
Condition 5
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 1.5 V
VIN = 1.2 V
VIN = 0.9 V
0.01 1000
1.90
1.70
1.80
1.84
1.86
1.76
1.72
1.74
1.78
1.82
1.88
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.5 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
IOUT [mA]
V
r
[
mV
]
V
IN
= 1.5 V
V
IN
= 1.2 V
V
IN
= 0.9 V
Condition 6
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.5 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.5 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
Vr [
mV
]
VIN = 2.5 V
VIN = 1.8 V
VIN = 1.2 V
VIN = 0.9 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 29
Characteristics (Typical Data)
1. Examples of Major Power Supply Dependence Characteristics (Ta = +25°C)
(1) Current consumption during operation (IIN1) vs.
Operating input voltage (VIN)
Current consumption during switching off (IIN2) vs.
Operating input voltage (VIN)
(2) Current consumption during operation (ISS1) vs.
Output voltage (VOUT)
Current consumption during switching off (ISS2) vs.
Output voltage (VOUT)
4.54.03.53.02.52.01.51.00.50.0
12
0
10
8
6
4
2
VIN [V]
I
IN1
, I
IN2
[μA]
IIN1, IIN2
5.04.03.02.01.00.0 V
OUT
[V]
I
SS1
, I
SS2
[μA]
1000
0
500
700
800
300
100
200
400
600
900
I
SS1
I
SS2
(3) Current consumption during power-off (ISSS) vs. Operating input voltage (VIN), Output voltage (VOUT)
4.54.03.53.02.52.01.51.00.50.0 V
IN
,
V
OUT
[V]
I
SSS
[μA]
1.0
0
0.5
0.7
0.8
0.3
0.1
0.2
0.4
0.6
0.9
(4) Oscillation frequency (fOSC) vs.
Output voltage (VOUT) (5) Start-up oscillation frequency (fST) vs.
Operating input voltage (VIN)
5.04.54.03.53.02.52.01.5
1.38
1.02
1.34
1.30
1.26
1.22
1.18
1.14
1.10
1.06
VOUT [V]
fosc [MHz]
4.54.03.53.02.52.01.51.00.50.0 V
IN
[V]
f
ST
[kHz]
500
450
400
350
300
250
200
150
100
(6) Maximum duty ratio (MaxDuty) vs.
Output voltage (VOUT) (7) Soft-start time (tSS) vs. Output voltage (VOUT)
5.04.54.03.53.02.52.01.5
100
95
90
85
80
75
70
V
OUT
[V]
MaxDuty [%]
5.04.54.03.53.02.52.01.5
1.5
1.4
1.3
1.2
1.1
1.0
0.9
V
OUT
[V]
t
SS
[ms]
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
30
(8) PWM / PFM switching duty ratio (PFMDuty) vs.
Operating input voltage (VIN) (9) Output current at PWM / PFM switching (IPFM) vs.
Operating input voltage (VIN)
4.54.03.53.02.52.01.51.00.50.0 VIN [V]
25
0
20
15
10
5
PFMDuty [%]
VOUT = 1.8 V
VOUT = 3.32 V
VOUT = 5.0 V
4.54.03.53.02.52.01.51.00.50.0 VIN [V]
70
0
60
50
40
30
20
10
I
PFM
[mA]
VOUT = 1.8 V
VOUT = 3.32 V
VOUT = 5.0 V
(10) Limited current (ILIM) vs.
Operating input voltage (VIN) (11) Maximum load current (IOUTMAX) vs.
Operating input voltage (VIN)
4.54.03.53.02.52.01.51.00.50.0
1600
1400
1200
1000
800
600
400
V
IN
[V]
I
LIM
[mA]
V
OUT
= 1.8 V
V
OUT
= 3.32 V
V
OUT
= 5.0 V
4.54.03.53.02.52.01.51.00.50.0 V
IN
[V]
I
OUTMAX
[mA]
1000
0
500
700
800
300
100
200
400
600
900
V
OUT
= 1.8 V
V
OUT
= 3.32 V
V
OUT
= 5.0 V
(12) Power MOS FET leaka ge cu rrent (ILSW) vs.
Output voltage (V
OUT) (13) High level input voltage (VSH) vs.
Operating input voltage (VIN)
5.04.54.03.53.02.52.01.51.00.50.0
0.5
0.4
0.3
0.2
0.1
0.0
VOUT [V]
I
LSW
[μA]
0.8
0.7
0.6
0.5
0.4
0.3
V
SH
[V]
4.54.03.53.02.52.01.51.00.50.0 V
IN
[V]
(14) Low level input voltage (VSL) vs.
Operating input voltage (VIN) (15) FB voltage (VFB) vs. Output voltage (VOUT)
4.54.03.53.02.52.01.51.00.50.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
VIN [V]
V
SL
[V]
0.63
0.62
0.61
0.60
0.59
0.58
0.57
V
OUT
[V]
V
FB
[V]
5.04.54.03.53.02.52.01.5
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 31
2. Examples of Major Temperature Characteristics (Ta = −40 to +85°C)
(1) Current consumption during operation (IIN1) vs.
Temperature (Ta) (2) Current consumption during operation (ISS1) vs.
Temperature (Ta)
Ta [°C]
−
40
IIN1 [μA]
10.0
0.0
5.0
7.0
8.0
3.0
1.0
2.0
4.0
6.0
9.0
857550250
−
25
VIN = 0.9 V
VIN = 1.8 V
VIN = 4.2 V
VIN = 4.5 V
Ta [°C]
−
40
ISS1 [μA]
1000
0
500
700
800
300
100
200
400
600
900
857550250
−
25
VOUT = 5.0 V
VOUT = 3.3 V
VOUT = 1.8 V
(3) Current consumption during switching off (IIN2) vs.
Temperature (Ta) (4) Current consumption during switching off (ISS2) vs.
Temperature (Ta)
Ta [°C]
−
40
I
IN2
[μA]
10.0
0.0
5.0
7.0
8.0
3.0
1.0
2.0
4.0
6.0
9.0
857550250
−
25
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 4.2 V
V
IN
= 4.5 V
Ta [°C]
−
40
ISS2 [μA]
200
0
100
140
160
60
20
40
80
120
180
857550250
−
25
VOUT = 1.8 V
VOUT = 3.3 V
VOUT = 5.0 V
(5) Current consumption during power-off (ISSS) vs. Temperature (Ta)
Ta [°C]
−
40
ISSS [μA]
1.0
0.0
0.5
0.7
0.8
0.3
0.1
0.2
0.4
0.6
0.9
857550250
−
25
VIN = VOUT = 4.5 V
(6) Oscillation frequency (fOSC) vs. Temperature (Ta) (7) Start-up oscillation frequency (fST) vs. Temperature (Ta)
Ta [°C]
−
40
1.38
1.02
1.34
1.30
1.26
1.22
1.18
1.14
1.10
1.06
fosc [MHz]
857550250
−
25
VOUT = 1.8 V
VOUT = 3.3 V
VOUT = 5.0 V
Ta [°C]
−
40
fST [kHz]
500
450
400
350
300
250
200
150
100
857550250
−
25
VIN = 0.9 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
32
(8) Maximum duty ratio (MaxDuty) vs. Temperature (Ta) (9) Soft-start time (tSS) vs. Temperature (Ta)
Ta [°C]
−
40
100
95
90
85
80
75
70
MaxDuty [%]
857550250
−
25
VOUT = 1.8 V
VOUT = 3.3 V
VOUT = 5.0 V
Ta [°C]
−
40
1.6
0.6
1.1
1.3
1.4
0.9
0.7
0.8
1.0
1.2
1.5
tSS [ms]
857550250
−
25
VOUT = 1.8 V
VOUT = 3.3 V
VOUT = 5.0 V
(10) PWM / PFM switching duty ratio (PFMDuty) vs.
Temperature (Ta) (11) Output current at PWM / PF M switch ing (IPFM) vs.
Temperature (Ta)
Ta [°C]
−
40
25
0
20
15
10
5
PFMDuty [%]
857550250
−
25
V
OUT
= 1.8 V, V
IN
= 1.2 V
V
OUT
= 3.32 V, V
IN
= 1.8 V
V
OUT
= 5.0 V, V
IN
= 3.0 V
Ta [°C]
−
40
30
25
20
15
10
5
0
I
PFM
[mA]
857550250
−
25
V
OUT
= 5.0 V, V
IN
= 3.0 V
V
OUT
= 3.32 V, V
IN
= 1.8 V
V
OUT
= 1.8 V, V
IN
= 1.2 V
(12) Limited current (ILIM) vs.
Temperature (Ta) (13) Maximum load current (IOUTMAX) vs.
Temperature (Ta)
Ta [°C]
−
40
1600
1400
1200
1000
800
600
400
ILIM [mA]
857550250
−
25
VOUT = 3.32 V, VIN = 1.8 V
VOUT = 1.8 V, VIN = 1.2 V
VOUT = 5.0 V, VIN = 3.0 V
Ta [°C]
−
40
1000
0
500
700
800
300
100
200
400
600
900
IOUTMAX [mA]
857550250
−
25
VOUT = 3.32 V, VIN = 1.8 V
VOUT = 1.8 V, VIN = 1.2 V
VOUT = 5.0 V, VIN = 3.0 V
(14) Power MOS FET leaka ge cu rrent (ILSW) vs.
Temperature (Ta) (15) High level input voltage (VSH) vs.
Temperature (Ta)
Ta [°C]
−
40
0.5
−0.5
0.0
0.2
0.3
−
0.2
−
0.4
−
0.3
−
0.1
0.1
0.4
ILSW [μA]
857550250
−
25
VOUT = 1.8 V
VOUT = 3.3 V
VOUT = 5.0 V
Ta [°C]
−
40
0.60
0.55
0.50
0.45
0.40
0.35
0.30
VSH [V]
857550250
−
25
VIN = 1.8 V
VIN = 0.9 V
VIN = 4.5 V
VIN = 4.2 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 33
(16) Low level input voltage (VSL) vs Temperature (T a) (17) FB voltage (VFB) vs. Temperatu re (Ta)
Ta [°C]
−
40
0.60
0.55
0.50
0.45
0.40
0.35
0.30
VSL [V]
857550250
−
25
VIN = 0.9 V
VIN = 1.8 V
VIN = 4.2 V
VIN = 4.5 V
Ta [°C]
−
40
0.63
0.62
0.61
0.60
0.59
0.58
0.57
VFB [V]
857550250
−
25
VOUT = 3.3 V
(18) Operating start voltage (VST) vs.
Temperature (Ta) (19) Start-up mode release voltag e (VSTU+) vs.
Temperature (Ta)
Ta [°C]
−
40
1.2
1.0
0.8
0.6
0.4
0.2
0.0
V
ST
[V]
857550250
−
25
I
OUT
= 10 mA
I
OUT
= 1 mA
I
OUT
= 0.1 mA
Ta [°C]
−
40
V
STU
+
[V]
1.6
1.1
1.5
1.4
1.3
1.2
857550250
−
25
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
34
3. Output waveform
(1) VOUT = 3.3 V（VIN = 1.98 V）
IOUT = 1 mA IOUT = 10 mA
3.26
3.34
3.33
3.32
3.31
3.30
3.29
3.28
3.27
t [2 μs / div] 3.0
3.8
VOUT [V]
VCONT [V]
3.1
3.2
3.3
3.4
3.5
3.6
3.7
VOUT
VCONT
3.26
3.34
3.33
3.32
3.31
3.30
3.29
3.28
3.27 3.0
3.8
VOUT [V]
3.1
3.2
3.3
3.4
3.5
3.6
3.7
t [1 μs / div]
VCONT [V]
VOUT
VCONT
IOUT = 100 mA IOUT = 300 mA
3.26
3.34
3.33
3.32
3.31
3.30
3.29
3.28
3.27
3.8
VOUT [V]
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.0
t [1 μs / div]
VCONT [V]
VOUT
VCONT
3.26
3.34
3.33
3.32
3.31
3.30
3.29
3.28
3.27
3.8
VOUT [V]
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.0
t [1 μs / div]
VCONT [V]
VOUT
VCONT
(2) VOUT = 5.0 V（VIN = 3.0 V）
IOUT = 1 mA IOUT = 10 mA
VOUT [V]
5.04
4.90
5.02
5.00
4.98
4.96
4.94
4.92
12.0
−
2.0
10.0
8.0
6.0
4.0
2.0
0.0
t [2 μs / div]
VCONT [V]
VOUT
VCONT
VOUT [V]
5.04
4.90
5.02
5.00
4.98
4.96
4.94
4.92
12.0
−
2.0
10.0
8.0
6.0
4.0
2.0
0.0
t [1 μs / div]
VCONT [V]
VOUT
VCONT
IOUT = 100 mA IOUT = 300 mA
VOUT [V]
5.04
4.90
5.02
5.00
4.98
4.96
4.94
4.92
12.0
−
2.0
10.0
8.0
6.0
4.0
2.0
0.0
t [1 μs / div]
VCONT [V]
VOUT
VCONT
VOUT [V]
5.04
4.90
5.02
5.00
4.98
4.96
4.94
4.92
12.0
−
2.0
10.0
8.0
6.0
4.0
2.0
0.0
t [1 μs / div]
VCONT [V]
VOUT
VCONT
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 35
4. Examples of Transient Response Characteristics
Unless otherwise spec ified, th e used parts ar e thos e in T abl e 6 Ext ern al P arts List .
4.1 At power-on (VOUT(S) = 3.3 V, VIN = 0 V → 0.9 V, Ta = +25°C)
(1) IOUT = 1 mA
0
4.0
3.0
2.0
1.0
Time [μs] 3.2
2.21.20.2
−
0.8
V
IN
, V
OUT
[V]
V
OUT
V
IN
4.2 At power-on (VOUT(S) = 3.3 V, VIN = 0 V → 2.0 V, Ta = +25°C)
(1) IOUT = 1 mA (2) IOUT = 300 mA
0
4.0
3.0
2.0
1.0
Time [μs] 3.2
2.21.20.2
−
0.8
V
IN
, V
OUT
[V]
V
OUT
V
IN
0
4.0
3.0
2.0
1.0
Time [μs] 3.2
2.21.20.2
−
0.8
V
IN
, V
OUT
[V]
V
OUT
V
IN
4.3 Power-off pin response (VOUT = 3.3 V, VIN = 0.9 V, VON/OFF = 0 V → 0.9 V, Ta = +25°C)
(1) IOUT = 1 mA
0
4.0
3.0
2.0
1.0
Time [μs] 3.2
2.21.20.2
−
0.8
V
ON/OFF
, V
OUT
[V]
V
OUT
V
ON/OFF
4.4 Power-off pin response (VOUT = 3.3 V, VIN = 2.0 V, VON/OFF = 0 V → 2.0 V, Ta = +25°C)
(1) IOUT = 1 mA (2) IOUT = 300 mA
0
4.0
3.0
2.0
1.0
Time [μs] 3.2
2.21.20.2
−
0.8
V
ON/OFF
, V
OUT
[V]
V
OUT
V
ON/OFF
0
4.0
3.0
2.0
1.0
Time [μs] 3.2
2.21.20.2
−
0.8
V
ON/OFF
, V
OUT
[V]
V
OUT
V
ON/OFF
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
36
4.5 Power supply voltage fluctuations (VOUT = 3.0 V, IOUT = 100 mA, Ta = +25°C)
(1) VIN = 1.98 V→2.64 V (2) VIN = 2.64 V→1.98 V
Time [μs]
VOUT [V]
3.5
3.0
6.0
1.0
400
−
100 3002001000
3.4
3.3
3.2
3.1
5.0
4.0
3.0
2.0
VIN [V]
VOUT
VIN
Time [μs]
VOUT [V]
3.5
3.0
6.0
1.0
400
−
100 3002001000
3.4
3.3
3.2
3.1
5.0
4.0
3.0
2.0
VIN [V]
V
OUT
V
IN
4.6 Load fluctuations (VOUT = 3.3 V, VIN = 1.98 V, IOUT = 0.1 mA → 100 mA → 0.1 mA, Ta = +25°C)
(1) IOUT = 0.1 mA→100 mA (2) IOUT = 100 mA→0.1 mA
Time [μs]
VOUT [V]
3.5
3.0
500
0
4003002001000
−
100
−
200
3.4
3.3
3.2
3.1
400
300
200
100
IOUT [mA]
V
OUT
I
OUT
Time [μs]
VOUT [V]
3.5
3.0
500
0
6
−
2
3.4
3.3
3.2
3.1
400
300
200
100
IOUT [mA]
420
V
OUT
I
OUT
4.7 Load fluctuations (VOUT = 3.3 V, VIN = 1.98 V, IOUT = 100 mA → 200 mA → 100 mA, Ta = +25°C)
(1) IOUT = 100 mA→200 mA (2) IOUT = 200 mA→100 mA
Time [μs]
VOUT [V]
3.5
3.0
500
0
400
−
100 3002001000
3.4
3.3
3.2
3.1
400
300
200
100
IOUT [mA]
V
OUT
I
OUT
Time [μs]
VOUT [V]
3.5
3.0
500
0
400
−
100 3002001000
3.4
3.3
3.2
3.1
400
300
200
100
IOUT [mA]
V
OUT
I
OUT
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 37
Reference Data
Reference data is provided to determine specific external components. Therefore, the following data shows the
characteristics of the recommend ed external compone nts select ed for vari ous app licatio ns .
1. External parts
Table 15 Efficiency vs. Output Current Characteristics and Output Voltage vs. Output Current Characteristics for
External Parts (1 / 2)
Condition Product Name Output Voltage L Product Name SD Prod uct Name CIN
1 S-8363B 1.8 V VLF302510 CRS08 C1608X7R1C105K
2 S-8363B 3.3 V VLF302510 CRS08 EMK107B7105KA
3 S-8363B 5.0 V VLF302510 CRS08 EMK107B7105KA
4 S-8363B 3.3 V VLF302510 CRS08 C1608X7R1C105K
5 S-8363B 3.3 V VLF302510 CRS08 C1608X7R1C105K
6 S-8363B 3.3 V VLF302510 RB070M-30TR EMK107B7105KA
7 S-8363B 3.3 V VLF302510 RB051LA-40TR EMK107B7105KA
Table 15 Efficiency vs. Output Current Characteristics and Output Voltage vs. Output Current Characteristics for
External Parts (2 / 2)
Condition COUT1 C
OUT2 C
OUT3 R
FB1 R
FB2 C
FB
1 C1608X5R0J106M C1608X5R0J106M ⎯ 30 kΩ 15 kΩ 82 pF
2 LMK212BJ106KD 0.1 μF ⎯ 68 kΩ 15 kΩ 47 pF
3 LMK212BJ106KD 0.1 μF ⎯ 110 kΩ 15 kΩ 38 pF
4 C1608X5R0J106M C1608X5R0J106M ⎯ 68 kΩ 15 kΩ 47 pF
5 C1608X5R0J106M C1608X5R0J106M C1608X5R0J106M 68 kΩ 15 kΩ 47 pF
6 LMK212BJ106KD 0.1 μF ⎯ 68 kΩ 15 kΩ 47 pF
7 LMK212BJ106KD 0.1 μF ⎯ 68 kΩ 15 kΩ 47 pF
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
38
The properties of the e xternal parts are s hown below.
Table 16 Ch aracteristic s of Extern al Pa rts
Part Part Name Manfuacturer Characteristics
Inductor VLF302510 TDK Corporation 2.2 μH, DCR*1 = 0.084 Ω, IMAX*2 = 1.23 A,
L × W×H = 3.0 × 2.5 × 1.0 mm
CRS08 TOSHIBA CORPORATION
VF*3 = 0.32 V typ., IF*4 = 1.5 A, VR*5 = 30 V,
L × W × H = 3.5 × 1.6 × 1.08 mm
RB070M-30TR VF*3 = 0.44 V typ., IF*4 = 1.5 A, VR*5 = 30 V,
L × W × H = 3.5 × 1.6 × 0.9 mm
RB051LA-40TR VF*3 = 0.35 V max., IF*4 = 3.0 A, VR*5 = 20 V,
L × W × H = 4.7 × 2.6 × 1.05 mm
RB161M-20TR VF*3 = 0.31 V typ., IF*4 = 1.0 A, VR*5 = 20 V,
L × W × H = 3.5 × 1.6 × 0.9 mm
Diode
RB161SS-20T2R
ROHM Co., Ltd.
VF*3 = 0.42 V, IF*4 = 1.0 A, VR*5 = 20 V,
L × W × H = 1.6 × 0.8 × 0.603 mm
LMK212BJ106KD 10 μF, EDC*6 = 10 V, X5R,
L × W × H = 2.0 × 1.25 × 0.95 mm
EMK107B7105KA TAIYO YUDEN Co., Ltd. 10 μF, EDC*6 = 16 V, X7R,
L × W × H = 1.6 × 0.8 × 0.9 mm
C1608X5R0J106M 10 μF, EDC*6 = 6.3 V, X5R,
L × W × H = 1.6 × 0.8 × 0.9 mm
Capacitor
C1608X7R1C 1 05K TDK Corporation 1 μF, EDC*6 = 16 V, X7R,
L × W × H = 1.6 × 0.8 × 0.9 mm
* 1. DCR : DC resi stanc e
* 2. IMAX : Maximum allowable current
* 3. VF : Forward voltage
* 4. IF : Forward current
* 5. VR : Reverse voltage
* 6. EDC : Rated voltage
Caution The values sh own in the characteristics column of Table 16 abo ve are based on the materials provided
by each manufacture. However, consider the characteristics of the original materials when using the
above products.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 39
2. Output Current (IOUT) vs. Efficiency (η) Characteristics, Output Current (IOUT) vs. Output Voltage
(VOUT) Characteristics
Following shows the actual outp ut current (IOUT) vs. efficienc y (η) and output current (IOUT) vs. output voltage (VOUT)
characteristics for conditions 1 to 7 in Table 15.
Condition 1 S-8363B (VOUT(S) = 1.8 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.5 V
0.01 1000
1.90
1.70
1.80
1.84
1.86
1.76
1.72
1.74
1.78
1.82
1.88
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.5 V
Condition 2 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
V
OUT
[V]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
Condition 3 S-8363B (VOUT(S) = 5.0 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
V
IN
= 1.8 V
V
IN
= 2.4 V
V
IN
= 3.0 V
V
IN
= 4.2 V
V
IN
= 4.5 V
0.01 1000
5.10
4.90
5.00
5.04
5.06
4.96
4.92
4.94
4.98
5.02
5.08
0.1 1 10 100
I
OUT
[mA]
V
OUT
[V]
V
IN
= 1.8 V
V
IN
= 2.4 V
V
IN
= 3.0 V
V
IN
= 4.5 V
V
IN
= 4.2 V
Condition 4 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.5 V
VIN = 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.5 V
VIN = 3.0 V
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
40
Condition 5 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
V
OUT
[V]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
Condition 6 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.5 V
VIN = 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
VOUT [V]
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.8 V
VIN = 2.5 V
VIN = 3.0 V
Condition 7 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
100
0
50
70
80
30
10
20
40
60
90
0.1 1 10 100
I
OUT
[mA]
η [%]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
0.01 1000
3.40
3.20
3.30
3.34
3.36
3.26
3.22
3.24
3.28
3.32
3.38
0.1 1 10 100
I
OUT
[mA]
V
OUT
[V]
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.8 V
V
IN
= 2.5 V
V
IN
= 3.0 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_00 S-8363 Series
Seiko Instruments Inc. 41
3. Output Current (IOUT) vs. Ripple Voltage (Vr) Characteristics
Following shows the actual output current (IOUT) vs. ripple voltage (Vr) characteristics for conditions of 1 to 7 in
Table 15.
Condition 1 S-8363B (VOUT(S) = 1.8 V) Condition 2 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
V
r
[
mV
]
V
IN
= 1.5 V
V
IN
= 1.2 V
V
IN
= 0.9 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
V
r
[
mV
]
V
IN
= 1.8 V
V
IN
= 2.5 V V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 3.0 V
Condition 3 S-8363B (VOUT(S) = 5.0 V) Condition 4 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
Vr [
mV
]
VIN = 3.0 V
VIN = 2.4 V
VIN = 4.5 V
VIN = 4.2 V VIN = 1.8 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
Vr [
mV
]
V
IN
= 1.8 V
V
IN
= 1.2 V
VIN = 3.0 V
VIN = 2.5 V
V
IN
= 0.9 V
Condition 5 S-8363B (VOUT(S) = 3.3 V) Condition 6 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
V
r
[
mV
]
V
IN
= 1.8 V
V
IN
= 1.2 V
V
IN
= 3.0 V
V
IN
= 2.5 V V
IN
= 0.9 V
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
V
r
[
mV
]
V
IN
= 1.8 V
V
IN
= 1.2 V
V
IN
= 3.0 V
V
IN
= 2.5 V V
IN
= 0.9 V
Condition 7 S-8363B (VOUT(S) = 3.3 V)
0.01 1000
50
0
25
35
40
15
5
10
20
30
45
0.1 1 10 100
I
OUT
[mA]
V
r
[
mV
]
V
IN
= 1.8 V
V
IN
= 1.2 V
V
IN
= 3.0 V
V
IN
= 2.5 V V
IN
= 0.9 V
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series Rev.2.0_00
Seiko Instruments Inc.
42
Marking Specification
(1) SNT-6A
(1) to (3) : Product code (Refer to Product name vs. Pr oduct c ode)
(4) to (6) : Lot number
SNT-6A
Top view
1
2
3 4
6
5
(1)
(4)
(2)
(5)
(3)
(6)
Product name vs. Product code
Product code
Product name (1) (2) (3)
S-8363B-I6T1U2 I 9 B
(2) SOT-23-6
(1) to (3) : Product code (Refer to Product name vs. Pr oduct c ode)
(4) : Lot number
6 4
1 3
2
(1) (2) (3) (4)
SOT- 23-6
T op view
5
Product name vs. Product code
Product code
Product name (1) (2) (3)
S-8363B-M6T1U2 I 9 B
Remark Please select products of environment al code = U for Sn 100%, ha loge n- free pr oducts.
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-PKG Dimensions
PG006-A-P-SD-2.0
No. PG006-A-P-SD-2.0
0.2±0.05
0.48±0.02
0.08 +0.05
-0.02
0.5
1.57±0.03
123
45
6
Feed direction
4.0±0.1
2.0±0.05
4.0±0.1
ø1.5 +0.1
-0
ø0.5
1.85±0.05 0.65±0.05
0.25±0.05
5°
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
PG006-A-C-SD-1.0
SNT-6A-A-Carrier Tape
No. PG006-A-C-SD-1.0
+0.1
-0
1
2
4
3
56
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY.
No. PG006-A-R-SD-1.0
PG006-A-R-SD-1.0
Enlarged drawing in the central part
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-Reel
5,000
No.
TITLE
SCALE
UNIT mm
SNT-6A-A-Land Recommendation
Seiko Instruments Inc.
PG006-A-L-SD-4.0
No. PG006-A-L-SD-4.0
0.3
0.2
0.52
1.36
0.52
1
2
Caution 1. Do not do silkscreen printing and solder printing under the mold resin of the package.
2. The thickness of the solder resist on the wire pattern under the package should be 0.03 mm
or less from the land pattern surface.
3. Match the mask aperture size and aperture position with the land pattern.
4. Refer to "SNT Package User's Guide" for details.
1. (0.25 mm min. / 0.30 mm typ.)
2. (1.30 mm ~ 1.40 mm)
0.03 mm
SNT
1. Pay attention to the land pattern width (0.25 mm min. / 0.30 mm typ.).
2. Do not widen the land pattern to the center of the package ( 1.30 mm ~ 1.40 mm ).
1.
2.
※1. 䇋⊼ᛣ⛞Ⲭᓣⱘᆑᑺ(0.25 mm min. / 0.30 mm typ.)DŽ
※2. 䇋࣓ᇕ㺙Ё䯈ᠽሩ⛞Ⲭᓣ (1.30 mm ~ 1.40 mm)DŽ
⊼ᛣ1. 䇋࣓㛖ൟᇕ㺙ⱘϟ䴶ࠋϱ㔥ǃ⛞䫵DŽ
2. ᇕ㺙ϟǃᏗ㒓Ϟⱘ䰏⛞㝰ᑺ (Ң⛞Ⲭᓣ㸼䴶䍋) 䇋ࠊ0.03 mmҹϟDŽ
3. 㝰ⱘᓔষሎᇌᓔষԡ㕂䇋Ϣ⛞Ⲭᓣᇍ唤DŽ
4. 䆺㒚ݙᆍ䇋খ䯙 "SNTᇕ㺙ⱘᑨ⫼ᣛ"DŽ
2.9±0.2
0.15
1.9±0.2
123
4
65
0.35±0.15
0.95
+0.1
-0.05
0.95
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
No. MP006-A-P-SD-2.0
MP006-A-P-SD-2.0
SOT236-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
123
45
6
ø1.5 +0.1
-0 2.0±0.05
ø1.0 +0.2
-0 4.0±0.1
1.4±0.2
0.25±0.1
3.2±0.2
Seiko Instruments Inc.
No. MP006-A-C-SD-3.1
MP006-A-C-SD-3.1
SOT236-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
No.
TITLE
SCALE
UNIT mm
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY 3,000
Seiko Instruments Inc.
Enlarged drawing in the central part
No. MP006-A-R-SD-2.1
MP006-A-R-SD-2.1
SOT236-A-Reel
www.sii-ic.com
• The information described herein is subject to change without notice.
• Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
mass-production design.
• When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the appropriate governmental authority.
• Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.
• The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, vehicle equipment,
in-vehicle equipment, aviation equipment, aerospace equipment, and nuclear-related equipment, without prior
written permission of Seiko Instruments Inc.
• The products described herein are not designed to be radiation-proof.
• Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.
