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Part: MAX618EVKIT
Category:
Others
Description: Max618 Evaluation Kit
Company: Maxim Integrated Products
Datasheet: Download MAX618EVKIT datasheet File size : 443 kB
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Datasheet text preview:
19-1462; Rev 0; 6/99
MAX618 Evaluation Kit
General Description
The MAX618 evaluation kit (EV kit) is a constant-freq u e n c y , 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 surface-mount circuit board. o +3V to VOUT Input Voltage Range o 12V or Adjustable Output Voltage o Up to 500mA Output Current o Internal 2A, 28V MOSFET Switch o 3µA Shutdown Current o 250kHz Switching Frequency o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX618
Component List
DESIGNATION QTY C1, C2 C3 C4 C5 C6, C7 C8 2 1 1 1 2 1 DESCRIPTION 68µF, 20V low-ESR tantalum caps AVX TPSE686M020R0150 or Sprague 593D686X0020E2W 0.1µF ceramic capacitor 4.7µF, 10V X5R ceramic capacitor Taiyo Yuden LMK316BJ475ML 0.047µF ceramic capacitor 1µF, 25V X5R ceramic capacitors Taiyo Yuden TMK316BJ105KL 68pF ceramic capacitor 2A Schottky diode SGS-Thomson STPS2L25U, Nihon EC21QS03L, or Central Semiconductor CMSH2-40M 15µH power inductor Sumida CDRH6D38-150 (shielded), Sumida CR75-150 (unshielded), or Sumida CDH74-150 (unshielded) 715k ±1% resistor 100k ±1% resistor MAX618EEE 3-pin header Shunt MAX618 PC board MAX618 data sheet PART MAX618EVKIT
Ordering Information
TEMP. RANGE 0°C to +70°C IC PACKAGE 16 QSOP
_________________________Quick Start
T h e 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) C o n n e c t 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) F o r 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 compensation capacitors C5 and C8. Note: Input (C1) and output (C2) capacitors are rated at 20V.
D1
1
L1
1
R1 R2 U1 JU1 None None None
1 1 1 1 1 1 1
Jumper Selection
The 3-pin header JU1 selects shutdown mode. Table 1 lists the selectable jumper options in shutdown mode.
Table 1. Jumper JU1 Shutdown Function
SHUNT LOCATION 1&2 2&3 SHDN PIN Connected to GND Connected to VL MAX618 OUTPUT Shutdown mode, VOUT = VIN - VDIODE MAX618 enabled, VOUT = 12V 1
________________________________________________________________ Maxim Integrated Products
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.
MAX618 Evaluation Kit Evaluates: MAX618
VIN C1 68µF 20V
C3 0.1µF
C7 1µF 25V LX LX 2 3 4 13 14 15 7
L1 15µH
1 SHDN 2 JU1 3 5 SHDN
10 IN
D1 VOUT +12V C2 68µF 20V C6 1µF 25V
MAX618
11 VL C4 4.7µF 10V 6 C5 0.047µF COMP GND 1, 8, 9, 12, 16 VL
LX PGND PGND PGND FB
R1 715k 1%
R2 100k 1%
C8 68pF
NOTE: HEAVY LINES INDICATE HIGH-CURRENT PATHS.
Figure 1. MAX618 EV Kit Schematic
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MAX618 Evaluation Kit Evaluates: MAX618
1.0"
Figure 2. MAX618 EV Kit--Component Placement Guide
1.0"
Figure 3. MAX618 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX618 EV Kit PC Board Layout--Solder Side
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