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| 19-1293; Rev 0; 10/97 MAX1649 Evaluation Kit ________________General Description The MAX1649 evaluation kit (EV kit) provides a regulated 5V output voltage from a 5.5V to 16.5V source. The circuit is configured to deliver up to 1.5A of output current using all surface-mount components. The MAX1649's low quiescent current and unique currentlimited PFM control scheme provide high efficiency over a wide range of load currents. The MAX1649 EV kit can also be used to evaluate the MAX1651 (3.3V output), MAX649, MAX651, and MAX652. However, the MAX1649/MAX1651 are improved versions of the MAX649/MAX651, and are recommended for new designs. ____________________________Features o +5.5V to +16.5V Input Supply Range o Over 90% Efficiency for 10mA to 1.5A Loads o 100A (max) Quiescent Supply Current o Fixed 5V or Optional Adjustable Output Voltage o 1.5A Output Current Capability o Fully Assembled and Tested Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651 ______________Ordering Information PART TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount MAX1649EVKIT-SO ____________________Component List DESIGNATION QTY C1, C6 C2 C3, C4 C5, C7 D1 JU1 L1 P1 2 1 2 0 1 1 1 1 DESCRIPTION 68F, 20V, low-ESR tantalum capacitors AVX TPSE686M020R0150 330F, 10V, low-ESR tantalum capacitor AVX TPSE337K010R0060 or Sprague 595D337X0010R 0.1F ceramic capacitors Not installed Schottky diode Nihon NSQ03A03 (3A) or SGS Thomson STP52L25L (2A) 3-pin header 47H inductor (SMT) Sumida CDRH125-470 P-channel MOSFET (SO-8) International Rectifier IRF7416 or Fairchild NDS8435A 0.05, 5% resistor (SMT) IRC LR2010-01-R050-J or Dale WSL-2010-R050-J Not installed MAX1649ESA Shunt MAX1649/MAX1651 data sheet ______________Component Suppliers Supplier AVX Dale-Vishay Fairchild International Rectifier IRC Motorola Nihon SGS Thomson Sprague Sumida-USA Phone (803) 946-0690 (402) 564-3131 (408) 721-2181 (310) 322-3331 (512) 992-7900 (303) 675-2140 (805) 867-2555 (617) 259-0300 (603) 224-1961 (847) 956-0666 Fax (803) 626-3123 (402) 563-6418 (408) 721-1635 (310) 322-3332 (512) 992-3377 (303) 675-2150 (805) 867-2698 (617) 259-9442 (603) 224-1430 (847) 956-0702 Note: Please indicate that you are using the MAX1649 when contacting these component suppliers. R1 R2, R3 U1 None None 1 0 1 1 1 ________________________ Quick Start The MAX1649 evaluation kit (EV) kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect a +5.5V to +16.5V power supply to the pad marked VIN. 2) Connect ground to the GND pad. 3) Connect a voltmeter and load (if any) to the VOUT pad. 4) For normal operation, place the shunt across pins 1 and 2 of jumper JU1. 5) Turn on the power supply and verify that the output voltage is 5V. 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 408-737-7600 ext. 3468. MAX1649 Evaluation Kit Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651 _______________Detailed Description Shutdown Control The MAX1649 provides a SHDN pin to disable the output. Table 1 lists the options available for shutdown control jumper JU1. An external controller can be used by removing the shunt on JU1 completely and connecting the external controller to the pad labeled SHDN. SHDN is a TTL/CMOS logic-level input. able. However, the input voltage must be high enough to avoid dropout (see the Typical Operating Characteristics section of the MAX1649/MAX1651 data sheet). Evaluating the MAX649/MAX651/MAX652 The MAX1649 EV kit can also be used to evaluate the MAX649/MAX651/MAX652. In addition to replacing the MAX1649 with a MAX649, change resistor R1 to 0.1. Contact Maxim for free samples of the MAX649CSA, MAX651CSA, or MAX652CSA. Note that the MAX1649/ MAX1651 are recommended over the MAX649/ MAX651/MAX652 for new designs. Output Voltage Adjustment The output voltage can be adjusted with minor modifications to the EV kit board. First, select output voltage divider resistors R2 and R3 (refer to the Setting the Output Voltage section of the MAX1649 data sheet). Second, open jumper JU3 and resistor R3 by cutting the thin PC board trace between their pads. Finally, install R2 and R3. The standard output filter capacitor is rated at 10V. Use a higher-rated capacitor if necessary. When using the MAX1651 or when adjusting the output of either device, an input voltage below 5.5V is accept- Table 1. Jumper JU1 Functions SHUNT LOCATION 1&2 2&3 SHDN PIN Connected to GND Connected to VIN MAX1649 OUTPUT MAX1649 enabled, VOUT = 5V Shutdown mode, VOUT = 0V VIN 5.5V to 16.5V C1 68F 20V 5 OFF 3 SHDN JU1 1 2 4 C3 0.1F ON C4 0.1F 3 V+ U1 CS 321 7 4 P1 8765 OUT 1 JU3 CUT HERE 8 GND FB 2 R2 OPEN D1 C2 330F 10V C7 OPEN C6 68F 20V 6 R1 0.05 GND MAX1649 SHDN EXT L1 47H VOUT REF R3 0 (PCB TRACE) C5 OPEN Figure 1. MAX1649 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1649 Evaluation Kit Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651 1.0" Figure 2. MAX1649 EV Kit Component Placement Guide-- Component Side 1.0" Figure 3. MAX1649 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX1649 EV Kit PC Board Layout--Solder Side _______________________________________________________________________________________ 3 MAX1649 Evaluation Kit Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651 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. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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