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| 19-0419; Rev 1; 9/95 MAX688-4A Evaluation Kit _______________General Description The MAX688-4A evaluation kit (EV kit) provides a regulated 3.3V output voltage while operating on input voltages from 3.5V to 11V. It delivers up to 4A output current from a 4.5V to 5.5V input, with low dropout. The MAX688-4A EV kit is a fully assembled and tested printed circuit board. The board comes with a 3.3V-output MAX688 IC installed, but can also be used to evaluate the MAX689 (3.0V output). ____________________________Features o 3.5V to 11V Input Supply Range o 3.3V Output Voltage o Up to 4A Output Current o <0.02A/MAX688 Shutdown Supply Current o 150A Quiescent Current o External PNP Pass Transistor o Adjustable Current Limit o Fully Assembled and Tested Evaluates: MAX688/MAX689 ____________________Component List DESIGNATION QTY C3 C4 1 1 DESCRIPTION 1F ceramic capacitor Marcon THCR30E1E105M 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2B 150F, 35V aluminum electrolytic caps. Nichicon UPL1V151MPH6 or Sanyo 35MV150GX 0.01F ceramic capacitor 1200F, 16V aluminum electrolytic cap. Nichicon UPL1C122MRH6 or Sanyo 16MV1200GX OR 1000F, 25V aluminum electrolytic cap. Sanyo 25MV100GX 10, 5% resistor 100k, 5% resistor 1k, 5% resistor PNP power transistor (TO-220) Motorola TIP42A PNP transistor, Motorola 2N4403 Heatsink, Thermalloy 6072B Maxim MAX688CSA (8-pin SO) 3-pin header 2-pin header Shunt PC board MAX688 data sheet ______________Ordering Information PART MAX688EVKIT-4A TEMP. RANGE 0C to +70C ______________Component Suppliers SUPPLIER AVX IRC Marcon Sanyo Sprague PHONE (803) 946-0238 (213) 772-2000 (708) 913-9980 (619) 661-6835 (508) 339-8900 FAX (803) 626-3123 (213) 772-9028 (708) 913-1150 (619) 661-1055 (508) 339-5063 C1, C2 C16 2 1 C5 1 _________________________Quick Start The MAX688-4A EV kit is a fully assembled and tested board. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) 2) 3) 4) Connect a 5V power supply to the pad marked VIN. The ground connects to the GND pad. Connect a voltmeter and load (if any) to the VOUT pad. Place one shunt across JU1 pins 2 and 3 and the other shunt across JU2 for normal operation. Turn on the power and verify that the output voltage is 3.3V. R4 R1 R3 Q1 Q2 None U1 JU1 JU2 None None None 1 1 1 1 1 1 1 1 1 2 1 1 Instructions for modifying the board for a 3.0V output appear in the section Evaluating the MAX689. ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. MAX688-4A Evaluation Kit Evaluates: MAX688/MAX689 _______________Detailed Description Shutdown Function The MAX688 has an active-low shutdown control input to turn its output on or off at any time. The 3-pin header JU1 selects the shutdown mode. Remove the shunt when driving shutdown with an external signal. Table 1 lists the jumper selectable options. Evaluating the MAX689 The MAX688 can be replaced with a MAX689 to generate a 3.0V output voltage with output current up to 4A. The only modification required is to replace the IC. Base-Current Limiting The output current can be limited by installing a currentlimiting resistor, R2, between BASE (pin 7) and BLIM (pin 6) of U1. This EV kit comes with a shunt across JU2, which limits base current to 20mA. For lower base current limit, refer to the MAX687/ MAX688/MAX689 data sheet for instructions on selecting the current-limiting resistor value. Table 1. Jumper JU1 Functions SHUNT LOCATION 2&3 2&1 SHDN PIN Connected to VIN Connected to GND MAX688 OUTPUT MAX6884A Enabled, VOUT = 3.3V Shutdown Mode, VOUT = 0V R3 1k, 5% VIN C4 4.7F 16V 3 2 1 JU1 SHDN PFO 3 PFO BLIM 6 C3 1F C1 150F C2 150F 1 IN Q1 TIP-42 Q2 2N4403 R4 10, 5% U1 CC MAX688 8 C16 0.01F 2 SHDN BASE 7 JU2 R2 OPEN, 5% 4 GND OUT 5 C5 1000F 25V C6* 220F 6.3V C7* 1F x 10 VOUT R1 100k * NOTE: RECOMMENDED FOR FAST 0.2A TO 4A TRANSIENT LOAD OPTIONAL * Figure 1. MAX688-4A EV Kit Schematic Diagram 2 _______________________________________________________________________________________ MAX688-4A Evaluation Kit Evaluates: MAX688/MAX689 Figure 2. Component Placement Guide--Component Side Figure 3. PC Board Layout--Component Side Figure 4. PC Board Layout--Solder Side _______________________________________________________________________________________ 3 MAX688-4A Evaluation Kit Evaluates: MAX688/MAX689 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. 4 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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