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| 19-3541; Rev 0; 2/05 MAX1515 Evaluation Kit General Description The MAX1515 evaluation kit (EV kit) is designed to evaluate the MAX1515 constant off-time, pulse-width-modulated (PWM) source/sink step-down DC-DC converter that is optimized for use in low-voltage active-termination power solutions in notebook and subnotebook computers. The EV kit board defaults in DDR mode and accepts 1.3V to 3.6V at VIN, 3.3V at VDD as the bias, and 2.5V or 1.8V at VDDQ as the reference. An output voltage is produced at VOUT equal to VDDQ / 2 that can sink or source 2.5A. In non-DDR mode, the voltage at VOUT is pin selectable with the following options: 1.5V, 1.8V, or 2.5V. In addition, the voltage at VOUT is adjustable from 0.5V to 2.7V. The MAX1515 EV kit is conveniently designed with jumpers to activate the feedback selection (FBSEL0, FBSEL1), reference selection (REFIN), DDR mode (MODE), pulse-skipping mode (SKIP), and shutdown mode (SHDN). 1.3V to 3.6V VIN Range VOUT Range: 0.5V to 2.7V at 2.5A Pin-Selectable Output Voltages: 1.5V, 1.8V, or 2.5V at 2.5A DDR Mode Enable (MODE) Forced PWM/Pulse-Skipping Selection (SKIP) Optimized Switching Frequency: 500kHz Shutdown Input (SHDN) Power-Good Output (PGOOD) Features Evaluates: MAX1515 Ordering Information PART MAX1515EVKIT TEMP RANGE 0C to +70C IC PACKAGE 24 TQFN (4mm x 4mm) Component List DESIGNATION C1 QTY 1 DESCRIPTION 22F, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J226 220F, 4V, 15m, 3.1ARMS POSCAP (D2E) Sanyo 4TPE220MF 0.01F 10%, 25V X7R ceramic capacitors (0402) Murata GRP155R71E103J TDK C1005X7R1E103K 470pF 5%, 50V C0G ceramic capacitor (0402) Murata GRP155R71H471K TDK C1005COG1H471J 1F 20%, 6.3V X5R ceramic capacitors (0402) TDK C1005X5R0J105M 0.47F 20%, 6.3V X5R ceramic capacitor (0402) TDK C1005X5R0J474M DESIGNATION C12 QTY 1 DESCRIPTION 0.01F 10%, 16V X7R reversetermination ceramic capacitor (0306) TDK C0816X7R1C103K 100F, 4V, 35m, 1.4ARMS POSCAP (B2) Sanyo 4TPE100MZB Not installed, diodes (SOD123) 1.2H inductor (7.6mm x 7.6mm x 3mm) Sumida CDR7D28MN-1R2 110k 1% resistor (0402) 10k 1% resistors (0402) 100k 5% resistor (0402) 10 5% resistor (0402) Shorted trace resistor (0402) Not installed, resistor (0402) MAX1515ETG (4mm x 4mm 24-pin thin QFN) 3-pin headers MAX1515 evaluation kit PC board C2 1 C13 D2, D3 L1 R1 R2, R3 R4 R5 R6 R7 U1 None None 1 0 1 1 2 1 1 0 0 1 6 1 C3, C4, C8 3 C5 1 C6, C7, C9, C11 C10 4 1 ________________________________________________________________ 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. MAX1515 Evaluation Kit Evaluates: MAX1515 Quick Start Recommended Equipment * * * 2.5VDC power supply (2.5A rated): VIN/VDDQ 3.3VDC power supply: VDD 2 digital voltmeters (DVMs) In addition, the voltage at VOUT is adjustable from 1.1V to 2.7V by setting the FBSEL0/FBSEL1 to GND, shorting REFIN to REF, opening the PC board short across R6, and installing R6 and R7. Calculate R6 using the following equation: R6 = ((VOUT / VREF) - 1) x R7 where VREF = 1.1V, R7 = 100k. The voltage at VOUT is also adjustable from 0.5V to 1.1V by setting FBSEL0/FBSEL1 to GND and directly driving REFIN to a voltage equal to the desired voltage at VOUT. When adjusting VOUT from 0.5V to 1.1V, use the following equation: VOUT = VREFIN Table 1 shows the proper jumper configurations for setting the output voltage. The MAX1515 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supplies until all connections are completed: 1) Verify the shunts are placed in the proper positions for the jumpers below: JU0 (2-3): FBSEL0 = GND. JU1 (2-3): FBSEL1 = GND. VOUT = VREFIN. JU2 (1-2): MODE = VCC. DDR mode enabled. JU3 (1-2): REFIN = VDDQ / 2. JU4 (1-2): SHDN = VCC. Shutdown mode disabled. JU5 (1-2): SKIP = VCC. Forced-PWM mode enabled. 2) Connect the 2.5VDC power supply rated for 2.5A across the VIN pad and the corresponding PGND pad. 3) Connect the 3.3VDC power supply across the VDD pad and the corresponding PGND pad. 4) Turn on both supplies: VDD = 3.3V and VIN = 2.5V. (Power-up sequence does not matter.) 5) Using a DVM, verify that the REFOUT voltage between the REFOUT and GND pads is 1.25V. 6) Using the other DVM, verify that the VOUT voltage between the VOUT and PGND pads is 1.25V. Jumper Settings See Tables 1-5 for all jumper setting descriptions on the MAX1515 EV kit. Table 1. Output Voltage Settings (FBSEL0/FBSEL1) FBSEL0 JU0 2-3* 2-3 1-2 1-2 FBSEL1 JU1 2-3* 1-2 2-3 1-2 1.5V 1.8V 2.5V DESCRIPTION Adjustable VFB = VREFIN * = Default position. Note: Refer to the MAX1515 data sheet for additional information on FBSEL0/FBSEL1. Detailed Description The MAX1515 EV kit is designed to evaluate the MAX1515 constant off-time, PWM source/sink stepdown DC-DC converter that is optimized for use in lowvoltage, active-termination power solutions in notebook and subnotebook computers. Table 2. DDR Mode (MODE) JUMPER SHUNT POSITION 1-2* JU2 2-3 DESCRIPTION DDR mode (REFOUT is active) Non-DDR mode (REFOUT is disabled) Setting the Output Voltage in DDR Mode (VOUT = VTT) In DDR mode, the voltage produced at VOUT is equal to REFIN (VDDQ / 2) and can sink or source 2.5A. Connect FBSEL0 and FBSEL1 to GND for DDR mode. * = Default position. Note: Refer to the MAX1515 data sheet for additional information on MODE. Setting the Output Voltage in Non-DDR Mode (VOUT) In non-DDR mode, the voltage at VOUT is pin selectable with the following options: 1.5V, 1.8V, or 2.5V. See Table 1 for the correct FBSEL0 and FBSEL1 settings. 2 _______________________________________________________________________________________ MAX1515 Evaluation Kit Evaluates: MAX1515 Table 3. REFIN Selection (REFIN) JUMPER JU3 SHUNT POSITION 1-2* 2-3 DESCRIPTION REFIN = VDDQ / 2 REFIN = REF Table 5. Pulse-Skipping Control Input (SKIP) JUMPER JU5 SHUNT POSITION 1-2* 2-3 DESCRIPTION Low-noise forced PWM mode Low-power pulse-skipping mode * = Default position. Note: Refer to the MAX1515 data sheet for additional information on REFIN. * = Default position. Table 4. Shutdown Control Input (SHDN) JUMPER SHUNT POSITION 1-2* JU4 2-3 DESCRIPTION The MAX1515 is in normal operation. The MAX1515 is in low-power shutdown. REFOUT is only in shutdown when MODE is connected to GND. Note: Refer to the MAX1515 data sheet for additional information on SKIP. * = Default position. Note: Refer to the MAX1515 data sheet for additional information on SHDN. Component Suppliers SUPPLIER Murata Sanyo USA Sumida USA TDK PHONE 770-436-1300 619-661-6835 847-545-6700 847-803-6100 www.sanyo.com www.sumida.com www.component.tdk.com WEBSITE www.murata.com Note: Indicate you are using the MAX1515 when contacting these component suppliers. _______________________________________________________________________________________ 3 MAX1515 Evaluation Kit Evaluates: MAX1515 VDD (3.0V TO 3.6V) C7 1F C6 1F R4 100k PGOOD VCC 1 3 JU5 2 VCC 1 3 VIN VDDQ R3 10k 1% 1 R2 10k 1% JU3 3 C9 1F 2 REFOUT JU4 2 15 19 7 R5 10 C8 0.01F LX VCC 4 11 C5 470pF 10 VCC VDD 20 BST IN IN COMP LX PGOOD LX 21 22 D2 OPEN L1 1.2H R6 SHORT (PC TRACE) C2 220F 4V C11 1F 23 24 LX C12 0.01F C1 22F D3 OPEN VOUT VIN VIN (1.3V TO 3.6V) C13 100F PGND SKIP U1 FB 9 R7 OPEN 1 2 3 12 MAX1515 SHDN PGND PGND IC REFOUT GND REFIN PGND 5 C10 0.47F 14 C4 0.01F 13 VCC 1 3 JU2 2 16 VCC 1 JU0 2 VCC 3 FBSEL0 17 GND REF FBSEL1 1 18 JU1 2 3 6 8 C3 0.01F SS MODE TOFF R1 110k 1% Figure 1. MAX1515 EV Kit Schematic 4 _______________________________________________________________________________________ MAX1515 Evaluation Kit Evaluates: MAX1515 Figure 2. MAX1515 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1515 EV Kit PC Board Layout--Component Side Figure 4. MAX1515 EV Kit PC Board Layout--Inner Layer 2 (GND, PGND) Figure 5. MAX1515 EV Kit PC Board Layout--Inner Layer 3 (GND, PGND) _______________________________________________________________________________________ 5 MAX1515 Evaluation Kit Evaluates: MAX1515 Figure 6. MAX1515 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. |
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