_________________________Quick Start
The MAX618 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed.
1) Connect a +5V supply to the VIN pad. Connect
ground to the GND pad.
2) Connect a voltmeter and load, if any, to the VOUT
pad.
3) Place the shunt across JU1 pins 2 and 3.
4) Turn on the power supply to the board and verify
that the output voltage is 12V.
5) For other output voltages, refer to the
Output
Voltage Selection
section in the MAX618 data sheet
for instructions on selecting feedback resistors R1
and R2, inductor L1, output capacitor C2, and com-
pensation capacitors C5 and C8. Note: Input (C1)
and output (C2) capacitors are rated at 20V.
Jumper Selection
The 3-pin header JU1 selects shutdown mode. Table 1
lists the selectable jumper options in shutdown mode.
General Description
The MAX618 evaluation kit (EV kit) is a constant-fre-
quency, PWM, step-up switching regulator with an
internal 2A, 28V n-channel MOSFET. The EV kit accepts
a +3V to VOUT input and converts it to a 12V output for
currents up to 500mA. Conversion efficiency is greater
than 90%. The EV kit operates at 250kHz, allowing the
use of small external components.
The MAX618 EV kit is a fully assembled and tested sur-
face-mount circuit board.
Features
♦+3V to VOUT Input Voltage Range
♦12V or Adjustable Output Voltage
♦Up to 500mA Output Current
♦Internal 2A, 28V MOSFET Switch
♦3µA Shutdown Current
♦250kHz Switching Frequency
♦Surface-Mount Components
♦Fully Assembled and Tested
Evaluates: MAX618
MAX618 Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
19-1462; Rev 0; 6/99
Component List
PART
MAX618EVKIT 0°C to +70°C
TEMP. RANGE IC PACKAGE
16 QSOP
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Ordering Information
MAX618EEE1U1
100kΩ±1% resistor1R2
715kΩ±1% resistor1R1
15µH power inductor
Sumida CDRH6D38-150 (shielded),
Sumida CR75-150 (unshielded), or
Sumida CDH74-150 (unshielded)
1L1
2A Schottky diode
SGS-Thomson STPS2L25U,
Nihon EC21QS03L, or
Central Semiconductor CMSH2-40M
1D1
68pF ceramic capacitor1C8
DESIGNATION
1µF, 25V X5R ceramic capacitors
Taiyo Yuden TMK316BJ105KL
2C6, C7
4.7µF, 10V X5R ceramic capacitor
Taiyo Yuden LMK316BJ475ML
1C4
0.1µF ceramic capacitor1C3
68µF, 20V low-ESR tantalum caps
AVX TPSE686M020R0150 or
Sprague 593D686X0020E2W
2C1, C2
DESCRIPTIONQTY
MAX618 PC board1None
Shunt1None
3-pin header1JU1
MAX618 data sheet1None 1 & 2 Connected to
GND Shutdown mode,
VOUT = VIN - VDIODE
2 & 3 Connected to
VL MAX618 enabled,
VOUT = 12V
Table 1. Jumper JU1 Shutdown Function
SHUNT
LOCATION SHDN PIN MAX618 OUTPUT
0.047µF ceramic capacitor1C5
Evaluates: MAX618
MAX618 Evaluation Kit
2 _______________________________________________________________________________________
LX
IN
SHDN
VL
COMP
GND
2
5
11
6
3
4
13
14
15
7
VOUT
+12V
C6
1µF
25V
C2
68µF
20V
L1
15µH
C1
68µF
20V
10
C8
68pF
R1
715k
1%
R2
100k
1%
D1
C7
C3
0.1µF
JU1
2
3
1
VIN
SHDN
C4
4.7µF
10V
C5
0.047µF
VL
1µF
25V
LX
LX
PGND
PGND
PGND
MAX618
FB
1, 8, 9, 12, 16
NOTE: HEAVY LINES INDICATE HIGH-CURRENT PATHS.
Figure 1. MAX618 EV Kit Schematic
Evaluates: MAX618
MAX618 Evaluation Kit
_______________________________________________________________________________________ 3
Figure 2. MAX618 EV Kit—Component Placement Guide
Figure 3. MAX618 EV Kit PC Board Layout—Component Side Figure 4. MAX618 EV Kit PC Board Layout—Solder Side
1.0"
1.0" 1.0"
Evaluates: MAX618
MAX618 Evaluation Kit
4 _______________________________________________________________________________________
NOTES
Evaluates: MAX618
MAX618 Evaluation Kit
_______________________________________________________________________________________ 5
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluates: MAX618
MAX618 Evaluation Kit
NOTES
