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| 19-1886; Rev 0; 12/00 MAX1761 Evaluation Kit General Description The MAX1761 evaluation kit (EV kit) demonstrates a standard 2A application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage rail for use as chipset, I/O, and other low-voltage supplies in notebook computers and PDAs. The MAX1761 EV kit provides dual 1.8V and 2.5V output voltages from a +5V to +20V battery input range. It delivers up to a 2A output current for each output with greater than 90% efficiency. The EV kit operates at 300kHz switching frequency and has superior line- and load-transient response. This EV kit is a fully assembled and tested circuit board. It also allows the evaluation of other output voltages in the 1.0V to 5.5V range by changing feedback resistors R1-R4. o +5V to +20V Input Voltage Range o Preset 1.8V and 2.5V Output Voltages o Adjustable Output Voltages (1V to 5.5V, external divider) o 2A Output Current o 300kHz Switching Frequency o No Current-Sense Resistor o 4A V+ Shutdown Supply Current o 5A VL Shutdown Supply Current o 16-Pin QSOP Package o Low-Profile Components o Fully Assembled and Tested Features Evaluates: MAX1761 Ordering Information PART MAX1761EVKIT TEMP. RANGE 0 C to +70 C o o IC PACKAGE 16 QSOP Component List DESIGNATION C1 C2, C7-C11 QTY 1 0 2 DESCRIPTION 10F, 25V ceramic capacitor (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M Not installed (0805) 220F, 10V low-ESR 40m capacitors Sanyo 10TPB220M or 330F, 10V low-ESR 30m capacitors Kemet T510X337M010AS 0.1F ceramic capacitor (0805) 4.7F, 10V X5R ceramic capacitor (1206) Taiyo Yuden LMK316BJ475ML 1F, 25V X5R ceramic capacitor Taiyo Yuden TMK316BJ105ML Not installed Nihon EP10QY03 DESIGNATION L1, L2 QTY 2 DESCRIPTION 7H power inductors Sumida CDRH104R-7R0NC Dual N- and P-channel MOSFETs International Rectifier IRF7319 or Fairchild FDS8958A Not installed (0805) 1M 5% resistors (0805) 10 5% resistor (0805) Not installed MAX1761EEE (16-pin QSOP) DIP-3 dip switch Rubber bumpers 3M SJ-5007 Mouser 517-SJ-5007BK or equivalent MAX1761 PC board MAX1761 data sheet MAX1761 EV kit data sheet N1, P1, N2, P2 R1-R6 R7, R8 R9 R10-R13 U1 SW1 None None None None 2 0 2 1 0 1 1 4 1 1 1 C3, C4 C5 C6 1 1 C12 D1, D2 1 0 ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. MAX1761 Evaluation Kit Evaluates: MAX1761 Component Suppliers SUPPLIER Fairchild International Rectifier Sanyo Sumida Taiyo Yuden TDK PHONE 408-721-2181 310-322-3331 619-661-6835 708-956-0666 408-573-4150 847-390-4373 FAX 408-721-1635 310-322-3332 619-661-1055 708-956-0702 408-573-4159 847-390-4428 4) Turn on the power and verify that the output voltages are 1.8V and 2.5V. 5) Refer to the Output Voltage Selection section in the MAX1761 data sheet to modify the board for different output voltages. 6) Refer to the Setting the Current Limit section in the MAX1761 data sheet to modify the board for a higher output current. Detailed Description Switch Settings Table 1 lists switch settings. Note: Please indicate that you are using the MAX1761 when contacting these suppliers. Evaluating Other Output Voltages Quick Start The MAX1761 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect voltmeters and loads (if any) to the VOUT pads. 2) Verify that switches ON1 and ON2 (SW1) are in the on position. 3) Connect a +5V to +20V supply to the pads marked VBATT and GND. The EV kit outputs are preset to +1.8V and +2.5V. However, the output voltages can also be adjusted between 1.0V and 5.5V by selecting R1/R2 and R3/R4 values. R1 and R3 are given by: R1 or R3 = (R2 or R4) ((VOUT / VFB) -1) where VFB = 1.0V. Table 1. Switch SW1 Functions SW1 LOCATION ON1 = low, ON2 = X ON1 = high, ON2 = low ON1 = high, ON2 = floating ON1 PIN Connected to GND, VOUT1 = 0, VOUT2 = 0 Connected to VBATT, VOUT1 = 2.5V, VOUT2 = depends on ON2 Connected to VBATT, VOUT1 = 2.5V ON2 PIN -- Connected to GND, VOUT2 = 0 ON2 = float VOUT2 = 1.8V OPERATION MODE MAX1761 is in shutdown mode. VOUT1 is in normal mode. VOUT2 is in shutdown mode. Low-noise mode, forced fixed-frequency PWM operation. Both outputs are enabled in normal mode. Normal operation allows automatic PWM/ PFM switchover for pulse skipping at light load, resulting in highest efficiency. ON1 = high, ON2 = high Connected to VBATT, VOUT1 = 2.5V Connected to VL, VOUT2 = 1.8V 2 _______________________________________________________________________________________ VBATT 5V TO 20V GND R9 10 C12 1F 25V C1 10F 25V C2 OPEN Figure 1. MAX1761 EV Kit Schematic GND 5 3 4 16 DH1 DH2 P2 5 6 R12 SHORT (PC TRACE) 9 3 4 R10 SHORT 5 (PC TRACE) 15 CS1 CS2 R11 OPEN 7 2 14 DL1 DL2 1 12 7 C11 OPEN FB2 8 2 C10 OPEN 1 FB1 R8 1M 4 ON2 VBATT 1 6 ON1 REF 3 C5 0.1F SW1-A (1.8V ON/OFF) R7 1M SW1-B OFF/ON 6 2 5 VL 13 C6 4.7F 10V C7 OPEN VL OUT2 OUT1 GND 11 2 7 8 N2 10 R13 OPEN L2 7H VOUT2 1.8V, 2A V+ P1 6 L1 7H D1 OPEN VOUT1 2.5V, 2A U1 MAX1761 C3 220F or 330F 10V 8 N1 1 R5 SHORT (PC TRACE) R1 OPEN D2 OPEN R6 SHORT (PC TRACE) C4 220F or 330F 10V R3 OPEN C8 OPEN VL SW1-C SKIP 3 4 R2 SHORT (PC TRACE) Evaluates: MAX1761 _______________________________________________________________________________________ C9 OPEN R4 SHORT (PC TRACE) MAX1761 Evaluation Kit 3 MAX1761 Evaluation Kit Evaluates: MAX1761 1.0" 1.0" Figure 2. MAX1761 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1761 EV Kit PC Board Layout--Ground Plane (Layer 2) 1.0" 1.0" Figure 4. MAX1761 EV Kit PC Board Layout--Ground Plane (Layer 3) Figure 5. MAX1761 EV Kit PC Board Layout--Solder Side 4 _______________________________________________________________________________________ MAX1761 Evaluation Kit Evaluates: MAX1761 1.0" 1.0" Figure 6. MAX1761 EV Kit Component Placement Guide-- Solder Side Figure 7. MAX1761 EV Kit PC Board Layout--Component 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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