TL497ACDRE4 - Texas Instruments High-Performance Analog



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

SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DHigh Efficiency...60% or Greater

DPeak Switch Current . . . 500 mA

DInput Current Limit Protection

DTTL-Compatible Inhibit

DAdjustable Output Voltage

DInput Regulation . . . 0.2% Typ

DOutput Regulation . . . 0.4% Typ

DSoft Start-Up Capability

DCan be Used in Buck, Boost, and

Inverting Configurations

description/ordering information

The TL497A incorporates all the active functions required in the construction of switching voltage regulators.

It also can be used as the control element to drive external components for high-power-output applications. The

TL497A was designed for ease of use in step-up, step-down, or voltage-inversion applications requiring high

efficiency.

The TL497A is a fixed-on-time variable-frequency switching-voltage-regulator control circuit. The switch-on

time is programmed by a single external capacitor connected between FREQ CONTROL and GND. This

capacitor, C T, is charged by an internal constant-current generator to a predetermined threshold. The charging

current and the threshold vary proportionally with VCC. Thus, the switch-on time remains constant over the

specified range of input voltage (4.5 V to 12 V). Typical on times for various values of CT are as follows:

TIMING CAPACITOR, CT (pF) 200 250 350 400 500 750 1000 1500 2000

ON TIME (µs) 19 22 26 32 44 56 80 120 180

The output voltage is controlled by an external resistor ladder network (R1 and R2 in Figures 1, 2, and 3) that

provides a feedback voltage to the comparator input. This feedback voltage is compared to the reference

voltage of 1.2 V (relative to SUBSTRATE) by the high-gain comparator. When the output voltage decays below

the value required to maintain 1.2 V at the comparator input, the comparator enables the oscillator circuit, which

charges and discharges CT as described above. The internal pass transistor is driven on during the charging

of CT. The internal transistor can be used directly for switching currents up to 500 mA. Its collector and emitter

are uncommitted, and it is current driven to allow operation from the positive supply voltage or ground. An

internal Schottky diode matched to the current characteristics of the internal transistor also is available for

blocking or commutating purposes. The TL497A also has on-chip current-limit circuitry that senses the peak

currents in the switching regulator and protects the inductor against saturation and the pass transistor against

overstress. The current limit is adjustable and is programmed by a single sense resistor, RCL, connected

between V CC and CUR LIM SENS. The current-limit circuitry is activated when 0.7 V is developed across RCL.

External gating is provided by the INHIBIT input. When the INHIBIT input is high, the output is turned off.

Simplicity of design is a primary feature of the TL497A. With only six external components (three resistors, two

capacitors, and one inductor), the TL497A operates in numerous voltage-conversion applications (step-up,

step-down, invert) with as much as 85% of the source power delivered to the load. The TL497A replaces the

TL497 in all applications.

The TL497AC is characterized for operation from 0°C to 70°C. The TL497AI is characterized for operation from

−40°C to 85°C.

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

COMP INPUT

INHIBIT

FREQ CONTROL

SUBSTRATE

GND

CATHODE

ANODE

VCC

CUR LIM SENS

BASE DRIVE†

BASE†

COL OUT

EMIT OUT

(TOP VIEW)

D, N, OR PW PACKAGE

NC − No internal connection

†BASE (11) and BASE DRIVE (12) are used for device testing

only. They normally are not used in circuit applications of the

device.

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        

SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

AVAILABLE OPTIONS

PACKAGED DEVICES

CHIP

TASMALL-OUTLINE

(D) PLASTIC DIP

(N)

SHRINK

SMALL-OUTLINE

(PW)

CHIP

FORM

(Y)

0°C to 70°C TL497ACD TL497ACN TL497ACPW TL497AY

−40°C to 85°C TL497AID TL497AIN — —

The D and PW packages are only taped and reeled. Add the suffix R to the device type (e.g.,

TL497ACPWR). Chip forms are tested at 25°C.

functional block diagram

BASE†11

BASE DRIVE†

CUR LIM SENS

FREQ CONTROL

INHIBIT

SUBSTRATE

COMP INPUT

CATHODE

Current

Limit

Sense

1.2-V

Reference

COL OUT

EMIT OUT

ANODE

Oscillator

†BASE and BASE DRIVE are used for device testing only. They normally are not used in circuit applications of the device.



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SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage, VCC (see Note 1) 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage, VO 35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, VI(COMP INPUT) 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, VI(INHIBIT) 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diode reverse voltage 35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power switch current 750 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diode forward current 750 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Notes 2 and 3): D package 86°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 101°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package 113°C/W. . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, Tstg −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values, except diode voltages, are with respect to network ground terminal.

2. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable

ambient temperature is PD = (TJ(max) − TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability.

3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace

length of zero.

recommended operating conditions

MIN MAX UNIT

Supply voltage, VCC 4.5 12 V

High-level input voltage, VIH INHIBIT pin 2.5 V

Low-level input voltage, VIL INHIBIT pin 0.8 V

Step-up configuration (see Figure 1) VI + 2 30

Output voltage Step-down configuration (see Figure 2) Vref VI − 1 V

Output voltage

Inverting regulator (see Figure 3) −Vref −25

Power switch current 500 mA

Diode forward current 500 mA

Operating free-air temperature range, TA

TL497AC 0 70

°C

Operating free-air temperature range, T

ATL497AI −40 85 °

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SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating conditions, VCC = 6 V (unless otherwise

noted)

PARAMETER

TEST CONDITIONS

TA†

TL497AC TL497AI

UNIT

PARAMETER

TEST CONDITIONS

†

MIN TYP‡MAX MIN TYP‡MAX

UNIT

High-level input current, INHIBIT VI(I) = 5 V Full range 0.8 1.5 0.8 1.5 mA

Low-level input current, INHIBIT VI(I) = 0 V Full range 5 10 5 20 µA

Comparator reference voltage VI = 4.5 V to 6 V Full range 1.08 1.2 1.32 1.14 1.2 1.26 V

Comparator input bias current VI = 6 V Full range 40 100 40 100 µA

Switch on-state voltage

VI = 4.5 V

IO = 100 mA 25°C 0.13 0.2 0.13 0.2

Switch on-state voltage VI = 4.5 V IO = 500 mA Full range 0.85 1 V

Switch off-state current

VI = 4.5 V,

VO = 30 V

25°C 10 50 10 50

Switch off-state current VI = 4.5 V, VO = 30 V Full range 200 500 µA

Sense voltage, CUR LIM SENS VI = 6 V 25°C 0.45 1 0.45 1 V

IO = 10 mA Full range 0.75 0.85 0.75 0.95

Diode forward voltage IO = 100 mA Full range 0.9 1 0.9 1.1 V

Diode forward voltage

IO = 500 mA Full range 1.33 1.55 1.33 1.75

Diode reverse voltage

IO = 500 µAFull range 30

Diode reverse voltage IO = 200 µAFull range 30 V

On-state supply current

25°C11 14 11 14

On-state supply current Full range 15 16 mA

Off-state supply current

25°C 6 9 6 9

Off-state supply current Full range 10 11 mA

†Full range is 0°C to 70°C for the TL497AC and −40°C to 85°C for the TL497AI.

‡All typical values are at TA = 25°C.

electrical characteristics over recommended operating conditions, VCC = 6 V, TA = 25°C (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

TL497AY

UNIT

PARAMETER

TEST CONDITIONS

MIN TYP MAX

UNIT

High-level input current, INHIBIT VI(I) = 5 V 0.8 mA

Low-level input current, INHIBIT VI(I) = 0 V 5µA

Comparator reference voltage VI = 4.5 V to 6 V 1.2 V

Comparator input bias current VI = 6 V 40 µA

Switch on-state voltage VI = 4.5 V, IO = 100 mA 0.13 V

Switch off-state current VI = 4.5 V, VO = 30 V 10 µA

IO = 10 mA 0.75

Diode forward voltage IO = 100 mA 0.9 V

Diode forward voltage

IO = 500 mA 1.33

On-state supply current 11 mA

Off-state supply current 6 mA



       

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SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

14 13 10 8

7654321

TL497A

R2 = 1.2 kΩ

BASIC CONFIGURATION

(Peak Switching Current = I(PK) < 500 mA)

RCL L

8101314

12345

EXTENDED POWER CONFIGURATION

(using external transistor)

TL497A

DESIGN EQUATIONS

I(PK) +2I

Omax ƪVO

VIƫ

L(mH) +VI

I(PK)ton (ms)

CT(pF) [12 ton (ms)

R1 +(VO–1.2V)kW

Choose L (50 to 500 µH), calculate

ton (25 to 150 µs)

RCL +0.5 V

I(PK)

CO(mF) [ton(ms)ƪVI

VOI(PK) )IOƫ

Vripple (PK)

R2 = 1.2 kΩ

RCL

Figure 1. Positive Regulator, Step-Up Configurations



        

SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

DESIGN EQUATIONS

I(PK) +2I

Omax

L(mH) +VI–V

I(PK) ton(ms)

CT(pF) [12 ton(ms)

R1 +(VO–1.2V)kW

Choose L (50 to 500 µH), calculate

ton (10 to 150 µs)

RCL +0.5 V

I(PK)

CO(mF) [ton(ms)ƪVI*VO

VOI(PK) )IOƫ

Vripple (PK)

RCL

8101314

TL497A

34567 R2 = 1.2 kΩ

RCL

14 13 10 8

123 4567

TL497A

R2 = 1.2 kΩ

EXTENDED POWER CONFIGURATION

(using external transistor)

BASIC CONFIGURATION

(Peak Switching Current = I(PK) < 500 mA)

Figure 2. Positive Regulator, Step-Down Configurations



       



SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

RCL

14 13 10 8

TL497A

12345

R2 = 1.2 kΩ

RCL

14 13 10 8 R1

12 3 45

DESIGN EQUATIONS

I(PK) +2I

Omaxƪ1)ŤVOŤ

VIƫ

L(mH) +VI

I(PK)ton(ms)

CT(pF) [12 ton(ms)

R1 +ǒŤVOŤ–1.2V

ǓkW

Choose L (50 to 500 µH), calculate

ton (10 to 150 µs)

RCL +0.5 V

I(PK)

CO(mF) [ton(ms)ƪVI

ŤVOŤI(PK) )IOƫ

Vripple (PK)

EXTENDED POWER CONFIGURATION

(using external transistor)

†

R2 = 1.2 kΩ

†

TL497A CO

BASIC CONFIGURATION

(Peak Switching Current = I(PK) < 500 mA)

†Use external catch diode, e.g., 1N4001, when building an inverting supply with the TL497A.

Figure 3. Inverting Applications

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SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

3-Term

Reg < 12 V

Switching

Circuit

Control

14 13

TL497A

VIVO

1 kΩ

10 mA

RCL

Vreg

14 13

TL497A

CURRENT LIMIT FOR EXTENDED INPUT CONFIGURATION

RCL +

VBE(Q1)

Ilimit (PK)

R1 )VI

IB(Q2)

R2 +ǒVreg *1Ǔ10 kW

Control

DESIGN EQUATIONS

Switching

Circuit

EXTENDED INPUT CONFIGURATION WITHOUT CURRENT LIMIT

3-Term

Reg < 12 V

Figure 4. Extended Input Voltage Range (VI > 12 V)

PACKAGING INFORMATION

Orderable Device Status (1) Package

Type Package

Drawing Pins Package

Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)

TL497ACD ACTIVE SOIC D 14 50 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACDE4 ACTIVE SOIC D 14 50 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACDG4 ACTIVE SOIC D 14 50 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACDR ACTIVE SOIC D 14 2500 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACDRE4 ACTIVE SOIC D 14 2500 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACDRG4 ACTIVE SOIC D 14 2500 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACN ACTIVE PDIP N 14 25 Pb-Free

(RoHS) CU NIPDAU N / A for Pkg Type

TL497ACNE4 ACTIVE PDIP N 14 25 Pb-Free

(RoHS) CU NIPDAU N / A for Pkg Type

TL497ACNSLE OBSOLETE SO NS 14 TBD Call TI Call TI

TL497ACNSR ACTIVE SO NS 14 2000 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACNSRE4 ACTIVE SO NS 14 2000 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACNSRG4 ACTIVE SO NS 14 2000 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACPWR ACTIVE TSSOP PW 14 2000 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACPWRE4 ACTIVE TSSOP PW 14 2000 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497ACPWRG4 ACTIVE TSSOP PW 14 2000 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AID ACTIVE SOIC D 14 50 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AIDE4 ACTIVE SOIC D 14 50 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AIDG4 ACTIVE SOIC D 14 50 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AIDR ACTIVE SOIC D 14 2500 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AIDRE4 ACTIVE SOIC D 14 2500 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AIDRG4 ACTIVE SOIC D 14 2500 Green (RoHS &

no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

TL497AIJ OBSOLETE CDIP J 14 TBD Call TI Call TI

TL497AIN ACTIVE PDIP N 14 25 Pb-Free

(RoHS) CU NIPDAU N / A for Pkg Type

TL497AINE4 ACTIVE PDIP N 14 25 Pb-Free

(RoHS) CU NIPDAU N / A for Pkg Type

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

PACKAGE OPTION ADDENDUM

www.ti.com 22-Sep-2009

Addendum-Page 1

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and

package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS

compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

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PACKAGE OPTION ADDENDUM

www.ti.com 22-Sep-2009

Addendum-Page 2

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

TL497ACDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1

TL497ACNSR SO NS 14 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.0 Q1

TL497ACPWR TSSOP PW 14 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1

TL497AIDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 14-Jul-2012

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

TL497ACDR SOIC D 14 2500 333.2 345.9 28.6

TL497ACNSR SO NS 14 2000 367.0 367.0 38.0

TL497ACPWR TSSOP PW 14 2000 367.0 367.0 35.0

TL497AIDR SOIC D 14 2500 333.2 345.9 28.6

PACKAGE MATERIALS INFORMATION

www.ti.com 14-Jul-2012

Pack Materials-Page 2

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