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| MAX1624 Evaluation Kit _______________General Description The MAX1624 evaluation kit (EV kit) provides a digitally programmable output voltage between 1.1V and 3.5V from a 5V input supply. It delivers up to 11.5A output current with greater than 90% efficiency. The MAX1624 EV kit features 1% output accuracy. The MAX1624 features a resistor-programmable switching frequency from 100kHz to 1MHz, as well as current-mode operation for superior load- and line-transient response. This EV kit is a fully assembled and tested circuit board. For a low-cost version of this kit that includes the Intel VRM connector and aluminum-electrolytic filter capacitors, order the MAX1624VRMEVKIT. ____________________________Features o 4.5V to 5.5V Input Voltage Range o 1.1V to 3.5V Output Voltage o 11.5A Output Current o Efficiency = 90%, VIN = 5V, VOUT = 2.5V @ IOUT = 10A o Selectable 0.5%, 1%, 2% AC Load Regulation o Power-OK Output o Glitch-CatcherTM Provides Excellent LoadTransient Response o 500kHz Switching Frequency o 24-Pin SSOP Package o Low-Profile Components Evaluates: MAX1624 ______________Ordering Information PART MAX1624EVKIT MAX1624VRMEVKIT TEMP. RANGE 0C to +70C 0C to +70C BOARD TYPE Surface Mount Through Hole _____________________________________________________________Component List DESIGNATION QTY C1, C2, C3 C4 C5, C6, C7 C8, C9, C10 C11, C12 3 0 3 3 2 DESCRIPTION 100F, 10V electrolytic capacitors Sanyo 10SL100M Open 220F, 4V electrolytic capacitors Sanyo 4SP220M 0.1F ceramic capacitors 4.7F, 16V tantalum capacitors Sprague 595D475X0016A2T 2.2F ceramic capacitor United Chemicon/Marcon THCR30E1E225Z 4700pF ceramic capacitors 1F ceramic capacitor 22F ceramic capacitor TDK C5650Y5U1E226M 1000pF ceramic capacitor 0.056F ceramic capacitor 1 Schottky diode Central Semiconductor CMPSH-3 0.5H power inductor Coiltronics UP4-R47 or Coilcraft DO5022P-501HC N-channel MOSFETs (D2PAK) International Rectifier IRL3103S R1, R2 2 DESIGNATION QTY U2 1 DESCRIPTION N- and P-channel MOSFET (SO-8) International Rectifier IRF7107 0.012, 1%, 1W resistors Dale WSL-2512-R012-F or IRC LR2512-01-R012-F 0.5, 5%, 1/2W resistor Dale WSL-2010-R5-J or IRC LR2010-01-R5-J 100, 5% resistor 40.2k, 1% resistor 100k, 5% resistors 39, 5% resistors Open 1k, 5% resistor MAX1624EAG 4-pin header 2-pin header Shunt Dip-10 dip switch MAX1624 PC board MAX1624 data sheet 1 R3 R4 R5 R6-R11 R12, R13 R14, R15 R16 U1 JU1 JU2 None SW1 None None 1 1 1 6 2 0 1 1 1 1 1 1 1 1 C13 C14, C15 C16 C17 CC1 CC2 D1 1 2 1 1 1 L1 1 N1, N2 2 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX1624 Evaluation Kit Evaluates: MAX1624 ______________Component Suppliers SUPPLIER* AVX Central Semiconductor Coilcraft Dale-Vishay International Rectifier IRC Motorola Sanyo Siliconix Sprague Sumida PHONE (803) 946-0690 (516) 435-1110 (708) 639-6400 (402) 564-3131 (310) 322-3331 (512) 992-7900 (602) 303-5454 (619) 661-6835 (408) 988-8000 (603) 224-1961 (847) 956-0666 FAX (803) 626-3123 (516) 435-1824 (708) 639-1469 (402) 563-6418 (310) 322-3332 (512) 992-3377 (602) 994-6430 (619) 661-1055 (408) 970-3950 (603) 224-1430 (847) 956-0702 0 0 0 0 0 0 0 0 1 1 1 1 - 1 0 - 1 1 - 1 0 - 1 1 - 1 0 - 0 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1 0 1 D4 D3 D2 D1 D0 1 1 1 0 0 - 0 0 - 0 0 - 0 1 - Table 1. MAX1624 Output-Voltage Adjustment Settings (Abbreviated) OUTPUT VOLTAGE (V) 3.5 3.4 Decreases in 100mV Intelincrements compatible codes 2.1 No CPU (off) 1.9 1.8 Decreases in 100mV increments 1.2 1.1 1.1 1.1 No CPU (off) Non-Intelcompatible codes COMPATIBILITY * Please indicate that you are using the MAX1624 when contacting these component suppliers. _________________________Quick Start The MAX1624 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) Turn on the power supply to the board. Verify that the output voltage is 0V. 4) Set switch SW1 per Table 1 to get the desired output voltage. Table 2. Jumper JU1 Functions SHUNT LOCATION 1&4 1&3 1&2 LG PIN Connected to GND Connected to REF Connected to VCC AC LOAD REGULATION (%) 0.5 1 2 _______________Detailed Description Jumper Selection The 3-pin header JU1 selects the loop gain. Table 2 lists the selectable jumper options. JU1 allows the user to trade off AC load regulation, transient response, and output filter capacitor size. Load regulation can be set to 0.5%, 1%, and 2%. The default value is 1%. The 2-pin header JU2 selects the shutdown mode. Table 3 lists the selectable jumper options. Table 3. Jumper JU2 Functions SHUNT LOCATION On Off REF PIN Connected to GND Connected to REF MAX1624 OUTPUT Shutdown mode, VOUT = 0V MAX1624 enabled 2 _______________________________________________________________________________________ VIN 4.5V TO 5.5V C8 0.1F R4 100 L R D1 1 CMPSH-3 2 C1 100F 10V C2 100F 10V C3 100F 10V VCC C11 4.7F, 16V C14 4700pF 9 20 VDD CSH C15 4700pF LG R2 0.012 4 R15 5 C9 0.1F L1 0.5H 2 21 22 19 2 1 12 R16 1k CC1 1000pF CC2 0.056F 7 8 U2A IRF7107 3 R14 1 N2 IRL3103S C4 OPEN C5 220F 4V C6 220F 4V C7 220F 4V R3 0.5 6 N1 IRL3103S U2B IRF7107 3 R1 0.012 C16 1F VCC C10 0.1F 8 JU1 R6 100k VIN 4 C12 4.7F 16V 3 R12 39 Figure 1. MAX1624 EV Kit Schematic U1 MAX1624 DH BST 1 2 PWROK REF LX DL DO PGND PDRV 6 7 NDRV R9 100k VIN FB 5 D2 CC1 CC2 FREQ D4 AGND 11 R5 40.2k 1% 15 14 13 8 17 D3 R11 VIN 100k 9 16 R10 VIN 100k 18 D1 23 10 VIN JU2 7 R8 100k VIN C13 2.2F 24 CSL 3 R13 39 C17* VOUT 22F VCC 2% 2 3 1% 1 4 0.5% PWROK ON/OFF R7 100k D0 5 6 SW1E D1 4 SW1D D2 3 SW1C D3 *MODELS LOCAL CPU BYPASS CAPACITORS. 2 SW1B D4 10 1 Evaluates: MAX1624 _______________________________________________________________________________________ SW1A MAX1624 Evaluation Kit 3 MAX1624 Evaluation Kit Evaluates: MAX1624 1.0" 1.0" Figure 2. MAX1624 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1624 EV Kit Component Placement Guide-- Solder Side 1.0" 1.0" Figure 4. MAX1624 EV Kit PC Board Layout--Component Side Figure 5. MAX1624 EV Kit PC Board Layout--Solder Side 1.0" 1.0" Figure 6. MAX1624 EV Kit PC Board Layout-- Internal GND Plane (layer 2) Figure 7. MAX1624 EV Kit PC Board Layout-- Internal Signal Plane (layer 3) 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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