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| 19-1353; Rev 0; 4/98 MAX685 Evaluation Kit ____________________________Features o +15V Positive Output Voltage o -7.5V Negative Output Voltage o 2.7V to 5.5V Battery Input Voltage o 10mA Output Current o Single Inductor for Both Outputs o 0.1A Shutdown Current o 200kHz or 400kHz Fixed Frequency o Power-OK Output o Surface-Mount, Low-Profile Components o Fully Assembled and Tested ________________General Description The MAX685 evaluation kit (EV kit) provides dual-output +15V and -7.5V voltages from 2.7V to 5.5V input voltage. Each output regulates separately, and each can deliver 10mA output current. Both output voltages can be adjusted by changing the feedback resistor values. The MAX685 EV kit provides low quiescent current and high efficiency for maximum battery life. The EV kit operates at a fixed 200kHz or 400kHz frequency, which allows the use of a tiny surface-mount inductor. This EV kit is a fully assembled and tested surface-mount circuit board. Evaluates: MAX685 Component List DESIGNATION QTY C1 1 DESCRIPTION 10F, 10V tantalum capacitor Sprague 595D106X0010A2T or AVX TAJA106K010R 2.2F, 25V ceramic capacitors (1206) Marcon/United Chemi-Con THCR30E1E225ZT 0.22F ceramic capacitors 47pF ceramic capacitor Open 0.5A, 20V Schottky diodes Motorola MBR0520LT3 3-pin headers 22H inductor Murata LQH4N220K04M00 or TDK NLC453232 220K 1.0M, 1% resistor (1206) 90.9k, 1% resistor (1206) 750k, 1% resistor (1206) 124k, 1% resistor (1206) 100k, 5% resistor (1206) MAX685EEE Shunts MAX685 PC board MAX685 data sheet _______________Ordering Information PART MAX685EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP C2, C3 C4, C5 C6 C7 D1, D2 JU1, JU2, JU3 L1 R1 R2 R3 R4 R5 U1 None None None 2 2 1 0 2 3 1 1 1 1 1 1 1 3 1 1 __________________Component Suppliers SUPPLIER AVX Coilcraft Dale-Vishay Marcon/ United Chemi-Con Motorola Murata Sprague Sumida TDK Vishay/Vitramon PHONE (803) 946-0690 (847) 639-6400 (402) 564-3131 (847) 696-2000 (602) 303-5454 (814) 237-1431 (603) 224-1961 (847) 956-0666 (847) 390-4373 (203) 268-6261 FAX (803) 626-3123 (847) 639-1469 (402) 563-6418 (847) 696-9278 (602) 994-6430 (814) 238-0490 (603) 224-1430 (847) 956-0702 (847) 390-4428 (203) 452-5670 Note: Please indicate that you are using the MAX685 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX685 Evaluation Kit Evaluates: MAX685 _________________________Quick Start The MAX685 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 +2.7V to +5.5V power supply to the VIN pad. Connect ground to the GND pad. 2) Connect voltmeters and loads, if any, to the +VOUT and VOUT- pads. 3) Verify that the shunts are on JU1, JU2, and JU3 across pins 2 and 3. 4) Turn on the power supply and verify the positive output voltage is +15V and the negative output is -7.5V. 5) For other output voltages, refer to the Setting the Output Voltage section in the MAX685 data sheet for instructions on selecting the feedback resistors. Table 1. Jumper JU1 Functions SHUNT LOCATION 1 and 2 SHDN PIN MAX685 OUTPUT Shutdown mode, +VOUT = 0, VOUT- = 0 MAX685 enabled, VOUT = +15V, VOUT- = -7.5V Connected to GND 2 and 3 Connected to VIN Table 2. Jumper JU2 Functions SHUNT LOCATION 1 and 2 2 and 3 SYNC PIN Connected to GND Connected to VIN FREQUENCY (kHz) 200 400 _______________Detailed Description The MAX685 EV kit provides dual-output +15V and -7.5V voltages from 2.7V to 5.5V input voltage. Each output regulates separately and each can deliver 10mA output current. Both output voltages can be adjusted by changing the feedback-resistor values. The EV kit minimizes total circuit size and cost by using a single inductor for both output voltages. It operates at a fixed 200kHz or 400kHz frequency and includes a shutdown function and a power-OK output. Table 3. Jumper JU3 Functions SHUNT LOCATION 1 and 2 SEQ PIN POWER SEQUENCE Negative output powers up before positive output. Positive output powers up before negative output. Connected to GND __________________Jumper Selection The MAX685 EV kit features a shutdown mode that reduces quiescent current to 0.1A typical to preserve battery life. The 3-pin header JU1 selects the shutdown mode. Table 1 lists the selectable jumper options. The 3-pin header JU2 selects the switching frequency. Table 2 lists the selectable jumper options. The 3-pin header JU3 selects the power sequence. Table 3 lists the selectable jumper options. 2 and 3 Connected to VIN 2 _______________________________________________________________________________________ MAX685 Evaluation Kit Evaluates: MAX685 VOUT-7.5V C3 2.2F 25V D1 MBR0520L L1 22H D2 MBR0520L +VOUT +15V C2 2.2F 25V VIN 2.7V TO 5.5V C4 0.22F C1 10F 10V 8 3 2 VDD VP I.C. LXN 16 PGND R3 750k 1% 1 LXP 14 R1 1.0M 1% C7 OPEN 10 R4 124k 1% REF 1.25V VIN 3 SHDN JU1 2 1 3 SYNC VIN 3 SEQ JU3 2 1 VIN JU2 2 1 C5 0.22F 6 11 FBN PGND 13 JU4 U1 MAX685 R2 90.9k 1% REF FBP 12 R5 100k SHDN POK 4 VIN C6 47pF POK 7 SYNC GND 9 15 5 SEQ I.C. Figure 1. MAX685 EV Kit Schematic _______________________________________________________________________________________ 3 MAX685 Evaluation Kit Evaluates: MAX685 1.0" Figure 2. MAX685 EV Kit Component Placement Guide-- Component Side 1.0" Figure 3. MAX685 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX685 EV Kit PC Board Layout--Solder Side 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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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