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| 19-1462; Rev 0; 6/99 MAX618 Evaluation Kit General Description The MAX618 evaluation kit (EV kit) is a constant-frequency, 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 3A 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 68F, 20V low-ESR tantalum caps AVX TPSE686M020R0150 or Sprague 593D686X0020E2W 0.1F ceramic capacitor 4.7F, 10V X5R ceramic capacitor Taiyo Yuden LMK316BJ475ML 0.047F ceramic capacitor 1F, 25V X5R ceramic capacitors Taiyo Yuden TMK316BJ105KL 68pF ceramic capacitor 2A Schottky diode SGS-Thomson STPS2L25U, Nihon EC21QS03L, or Central Semiconductor CMSH2-40M 15H 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 0C to +70C IC PACKAGE 16 QSOP _________________________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 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 68F 20V C3 0.1F C7 L1 15H 1 SHDN 2 JU1 3 5 SHDN 10 IN 1F 25V LX LX 2 3 4 13 14 15 7 R1 715k 1% D1 VOUT +12V C2 68F 20V C6 1F 25V MAX618 11 VL C4 4.7F 10V 6 C5 0.047F COMP GND 1, 8, 9, 12, 16 VL LX PGND PGND PGND FB R2 100k 1% C8 68pF NOTE: HEAVY LINES INDICATE HIGH-CURRENT PATHS. Figure 1. MAX618 EV Kit Schematic 2 _______________________________________________________________________________________ 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 _______________________________________________________________________________________ 3 MAX618 Evaluation Kit Evaluates: MAX618 NOTES 4 _______________________________________________________________________________________ MAX618 Evaluation Kit NOTES Evaluates: MAX618 5 _______________________________________________________________________________________ MAX618 Evaluation Kit Evaluates: MAX618 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 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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