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| MAX1625 Evaluation Kit _______________General Description The MAX1625 evaluation kit (EV kit) provides a 2.5V output voltage from a 4.5V to 5.5V input. It delivers up to 5A output current with greater than 90% efficiency. The MAX1625 features a resistor-programmable switching frequency from 100kHz to 1MHz, as well as currentmode operation for superior load- and line-transient response. This EV kit operates at a 500kHz switching frequency. It can also be used to evaluate other output voltages by changing feedback resistors R2 and R3. ____________________________Features o 4.5V to 5.5V Input Voltage Range o 2.5V Output Voltage (1.1V to 4.0V adjustable) o 5A Output Current o Efficiency = 91%, VIN = 5V, VOUT = 2.5V @ IOUT = 2.5A o Power-OK Output o 500kHz Switching Frequency o 16-Pin Narrow SO o Low-Profile Components o Fully Assembled and Tested Evaluates: MAX1625 ______________Ordering Information PART MAX1625EVKIT TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount _____________________________________________________________Component List DESIGNATION QTY C1 C2, C3 C4, C5, C9 C6 C7, C8 C10 C11, C12 CC1 CC2 D1 (optional) D2 1 2 3 1 2 0 2 1 1 1 DESCRIPTION 100F, 10V electrolytic capacitor Sanyo 10SL100M 220F, 4V electrolytic capacitors Sanyo 4SP220M 0.1F ceramic capacitors 2.2F ceramic capacitor 4.7F, 16V tantalum capacitors Sprague 595D475X0016A2T Open 4700pF ceramic capacitors 1000pF ceramic capacitor 0.056F ceramic capacitor Schottky diode Nihon NSQ03A02 or Motorola MBRS340T3 Schottky diode Central Semiconductor CMPSH-3 1.5H power inductor Coiltronix UP2-1R5, Coilcraft DO3316P-152, or Sumida CDRH127-1R3 R2 R3 R4 R5 R6 R7, R8 R9 U1 JU1 None None None 1 1 1 1 1 2 1 1 1 1 1 1 127k, 1% resistor 100k, 1% resistor 40.2k, 1% resistor 100k, 5% resistor 100, 5% resistor 39, 5% resistors 1k, 5% resistor MAX1625ESE 2-pin header Shunt MAX1625 PC board MAX1625 data sheet R1 1 DESIGNATION QTY N1, N2 2 DESCRIPTION N-channel MOSFETs (SO-8) International Rectifier IRF7413 or Siliconix Si4410DY 0.012, 1%, 1W resistor Dale WSL-2512-R012-F or IRC LR2512-01-R012-F 1 L1 1 ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX1625 Evaluation Kit Evaluates: MAX1625 ______________Component Suppliers SUPPLIER* AVX Central Semiconductor Coilcraft Dale-Vishay International Rectifier IRC Motorola Nihon Sanyo Siliconix Sprague Sumida Vishay/Vitramon PHONE (803) 946-0690 (516) 435-1110 (708) 639-6400 (402) 564-3131 (310) 322-3331 (512) 992-7900 (602) 303-5454 (805) 867-2555 (619) 661-6835 (408) 988-8000 (603) 224-1961 (847) 956-0666 (203) 268-6261 FAX (803) 626-3123 (516) 435-1824 (708) 639-1469 (402) 563-6418 (310) 322-3332 (512) 992-3377 (602) 994-6430 (805) 867-2698 (619) 661-1055 (408) 970-3950 (603) 224-1430 (847) 956-0702 (203) 452-5670 _______________Detailed Description The MAX1625 provides a 2.5V output from 4.5V to 5.5V input voltage. It delivers up to 5A and operates at 500kHz. Other output voltages can be programmed by changing the feedback resistor R2. R2 is given by: V R2 = R3 OUT - 1 1.1 where R3 = 100k. Jumper Selection The 2-pin header JU1 selects the shutdown mode. Table 1 lists the selectable jumper options. Table 1. Jumper JU1 Functions SHUNT LOCATION On Off REF PIN Connected to GND Floating MAX1625 OUTPUT Shutdown mode, VOUT = 0V MAX1625 enabled, VOUT = 2.5V * Please indicate that you are using the MAX1625 when contacting these component suppliers. _________________________Quick Start The MAX1625 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 voltage to the VIN pad. The ground connects to the GND pad. 2) Connect a voltmeter and load, if any, to the VOUT pad. 3) Remove the shunt from JU1. 4) Turn on the power supply to the board. Verify that the output voltage is 2.5V. 2 _______________________________________________________________________________________ VIN 4.5V TO 5.5V 1 2 L R D2 CMPSH-3 C11 4700pF 3 R7 39 C1 100F 10V R6 100 Figure 1. MAX1625 EV Kit Schematic C9 0.1F C12 4700pF C7 4.7F 16V 5 VCC VDD CSH 4 3 16 N1 1 C4 0.1F L1 1.5H N2 C10 OPEN D1 NSQ03A02 (OPTIONAL) R2 127k 1% C2 220F 4V C3 220F 4V VOUT 2.5V, 5A R8 39 R1 0.012 12 C5 0.1F CSL DH REF BST C8 4.7F 16V U1 MAX1625 ON/OFF 6 C6 2.2F R5 100k LX 2 PWROK DL 9 CC1 PGND CC2 FREQ AGND 7 FB 8 14 10 11 13 R11 1k 15 JU1 VIN PWROK CC1 1000pF CC2 0.056F Evaluates: MAX1625 _______________________________________________________________________________________ R3 100k 1% R4 40.2k 1% MAX1625 Evaluation Kit 3 MAX1625 Evaluation Kit Evaluates: MAX1625 1.0" 1.0" Figure 2. MAX1625 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1625 EV Kit PC Board Layout--Component Side 1.0" 1.0" Figure 4. MAX1625 EV Kit PC Board Layout--Two Internal Ground Planes Figure 5. MAX1625 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) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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