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| MAX608 Evaluation Kit _______________General Description The MAX608 evaluation kit (EV kit) provides a regulated 5V or adjustable output voltage from an input source as low as 1.8V. It drives loads up to 0.5A with greater than 80% conversion efficiency. This EV kit is a fully assembled and tested surfacemount circuit board. Additional pads on the bottom of the board accommodate the external feedback resistors for setting different output voltages. ____________________________Features o 5V or Adjustable Output Voltage o 1.8V to VOUT + 0.4V Input Range o Up to 0.5A Output Current o 5A Max Shutdown Current o 110A Max Supply Current (MAX608 I.C. only) o Up to 300kHz Switching Frequency o 8-Pin SO, Surface-Mount Construction o Fully Assembled and Tested Evaluates: MAX608 ____________________Component List DESIGNATION QTY C1 1 DESCRIPTION 68F, 20V tantalum capacitor Sprague 593D686X0020E2W AVX TPSE686M020R0150 100F, 16V tantalum capacitors Sprague 593D107X0016E2W AVX TPSE107M016R0100 0.1F ceramic capacitors Vitramon VT1206Y104KXA 3A, 40V Schottky diode Nihon NSQ03A04 Motorola MBRU340T3 22H inductor Sumida CDRH125-220 N-channel MOSFET (SOT-223) Motorola MMFT3055EL 0.050, 1% resistor (SMT) Dale WSL-2010-R050-F IRC LR2010-01-R050-F Maxim MAX608ESA (SO-8) 3-pin header Shunt Printed circuit board MAX608 data sheet ______________Ordering Information PART MAX608EVKIT-SO TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount C2, C3 C4, C5 D1 L1 N1 R1 U1 JU1 None None None 2 2 1 1 1 1 1 1 1 1 1 ______________Component Suppliers SUPPLIER AVX Dale IRC Motorola Nihon Sprague Sumida Vishay/Vitramon PHONE (803) 946-0690 (402) 564-3131 (512) 992-7900 (602) 303-5454 (805) 867-2555 (603) 224-1961 (708) 956-0666 (203) 268-6261 FAX (803) 626-3123 (402) 563-6418 (512) 992-3377 (602) 994-6430 (805) 867-2698 (603) 224-1430 (708) 956-0702 (203) 452-5670 ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. MAX608 Evaluation Kit Evaluates: MAX608 _________________________Quick Start The MAX608 EV kit is a fully assembled and tested surface-mount printed circuit board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect a 3V supply to the pad marked VIN. The ground connects to the GND pad. 2) Connect a voltmeter and load (if any) to the VOUT pad. 3) Place the shunt on JU1 across pins 1 and 2 for normal operation. 4) Turn on the power and verify that the output voltage is 5V. 5) Refer to the section Evaluating Other Output Voltages to modify the board for different output voltages. Table 1. Jumper JU1 Functions SHUNT LOCATION 2&3 1&2 SHDN PIN Connected to VIN Connected to GND MAX608 OUTPUT Shutdown mode, VOUT = VIN - 0.4V MAX608 enabled, VOUT = 5.0V Inductor Selection The 22H Sumida CDRH125-220 inductor mounted on the EV kit board is a low-resistance, shielded, mediumcurrent inductor. It provides excellent performance over the line and load ranges. Refer to the section Determining the Inductor in the MAX608 data sheet for instructions on selecting the inductor value. Evaluating Other Output Voltages The MAX608 is preset for a 5V output voltage. However, its output may also be adjusted via an external voltage divider formed by R2 and R3 (located on the bottom side of the board). The only other modification required is to cut the trace across R3. The section Setting the Output Voltage in the MAX608 data sheet gives instructions for calculating R2 and R3 values. For output voltages greater than 15V, use the MAX1771. _______________Detailed Description Jumper Selection The 3-pin header JU1 selects shutdown mode. Table 1 lists the selectable jumper options. VIN C1 68F 20V L1 22H D1 NSQ03A03 VOUT C2 100F 16V SHDN 3 JU1 1 GND C4 0.1F GND 3 2 4 SHDN U1 MAX608 EXT 1 N1 MMFT3055ELT1 R1 0.050 C3 100F 16V R2 OPEN C6 OPEN 5 REF CS+ 8 FB OUT 2 C5 0.1F GND R3 0 7 GND AGND 6 Figure 1. MAX608 EV Kit Schematic 2 _______________________________________________________________________________________ MAX608 Evaluation Kit Evaluates: MAX608 Figure 2. MAX608 EV Kit Component Placement Guide-- Component Side Figure 3. MAX608 EV Kit Component Placement Guide-- Solder Side Figure 4. MAX608 EV Kit PC Board Layout-- Component Side Figure 5. MAX608 EV Kit PC Board Layout-- Solder Side _______________________________________________________________________________________ 3 MAX608 Evaluation Kit Evaluates: MAX608 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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