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19-1648; Rev 1; 5/00
MAX1715 Evaluation Kit
General Description
The MAX1715 evaluation kit (EV kit) demonstrates the MAX1715's standard 4A application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating precision, low-voltage rails for use as chipset, DRAM supplies, and low-voltage supplies. The MAX1715 EV kit provides dual 1.8V and 2.5V output voltages from a 5V to 24V battery input range. It delivers up to 4A output current for each output with greater than 90% efficiency, operating at 255/345kHz switching frequency, and has superior line- and loadtransient 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 +24V Input Voltage Range o Preset 1.8V and 2.5V Output Voltages o 1.0V to 5.5V Adjustable Outputs o 4A Output Current o 255/345kHz Switching Frequency o No Current-Sense Resistor o Power-Good Output o 28-Pin QSOP Package o Low-Profile Components o Fully Assembled and Tested
Features
Evaluates: MAX1715
Ordering Information
PART MAX1715EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 28 QSOP
Component List
DESIGNATION QTY C1, C2 2 DESCRIPTION 10F, 25V ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM or Tokin C34Y5U1E106Z 330F, 6.3V low-ESR capacitors Kemet T510X337M010AS or Sanyo 6TPB330M 0.1F ceramic capacitors (0805) 0.22F ceramic capacitor (1206) 1F, 10V X5R ceramic capacitor (0805) Taiyo Yuden LMK212BJ105MG 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2B Not installed 1000pF ceramic capacitors (1206) 3.3F, 10V X5R ceramic capacitor (1206) Taiyo Yuden LMK316BJ335ML 1A, 30V Schottky diodes Nihon EP10QY03 100mA, 30V dual Schottky diode Central Semiconductor CMPSH-3A DESIGNATION QTY L1 L2 N1A, N1B, N2A, N2B R1, R3, R9, R10 R2, R4 R5 R6, R7, R8 R11, R12 R13 U1 SW1 None None None None 1 1 2 0 2 1 3 2 1 1 1 4 1 1 1 DESCRIPTION 3.9H power inductor Sumida CDRH124-3R9MC 4.7H power inductor Sumida CDRH124-4R7MC Dual N-channel MOSFETs Fairchild FDS6982 Not installed 10k 1% resistors (1206) 100k 5% resistor (1206) 1M 5% resistors (1206) 100 5% resistors (0805) 20 5% resistor (1206) MAX1715EEI (28-pin QSOP) DIP-6 dip switch Rubber feet MAX1715 PC board MAX1715 data sheet MAX1715 EV kit data sheet
C3, C4 C5, C6 C7 C8 C9 C10, C11 C12, C13 C14 D1, D2 D3
2 2 1 1 1 0 2 1 2 1
________________________________________________________________ Maxim Integrated Products
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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1715 Evaluation Kit Evaluates: MAX1715
Component Suppliers
SUPPLIER AVX Central Semiconductor Coilcraft Coiltronics Fairchild Kemet Motorola Nihon Sanyo Sumida Taiyo Yuden Tokin PHONE 803-946-0690 516-435-1110 708-639-6400 561-241-7876 408-721-2181 408-986-0424 602-303-5454 847-843-7500 619-661-6835 708-956-0666 408-573-4150 408-432-8020 FAX 803-626-3123 516-435-1824 708-639-1469 561-241-9339 408-721-1635 408-986-1442 602-994-6430 847-843-2798 619-661-1055 708-956-0702 408-573-4159 408-434-0375
Table 1. Recommended Equipment
EQUIPMENT Power supply, battery, or notebook AC adapter DC bias power supply Dummy loads capable of sinking 4A Digital multimeter (DMM) Dual-trace oscilloscope 100MHz MINIMUM REQUIREMENTS 5V to 24V 5V at 100mA -- --
3) Turn on battery power prior to +5V bias power; otherwise, the output UVLO timer will time out and the FAULT latch will be set, disabling the regulator outputs until +5V power is cycled or ON1/ON2 is toggled. 4) Verify that the output voltages are 1.8V and 2.5V.
Note: Please indicate that you are using the MAX1715 when contacting these component suppliers.
Evaluating Other Output Voltages
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. Select feedback resistors R1 and R3. R1 and R3 are then given by: R1 (or R3) = R2 (or R4) x [(VOUT / VFB) - 1] where VFB = 1.0V. This EV kit includes two 10k 1% resistors for R2 and R4.
Quick Start
The MAX1715 EV kit is fully assembled and tested. Follow these steps to evaluate the MAX1715 standard 4A application circuit: 1) Ensure that the circuit is connected correctly to the supplies and dummy load. Do not turn on power until all connections are made. 2) Verify that switches ON1 and ON2 (SW1) are in the on position.
Jumper and Switch Settings
Table 2 lists the switch SW1 functions, and Tables 3-6 list the JU1-JU6 jumper functions.
Table 2. Switch SW1 Functions
SW1 LOCATION ON1 = on ON1 = off ON2 = on ON2 = off SKIP = on ON1 PIN Connected to VCC, VOUT1 = 1.8V Connected to GND, VOUT1 = 0 -- -- -- ON2 PIN -- -- Connected to VCC, VOUT2 = 2.5V Connected to GND, VOUT2 = 0 -- SKIP PIN -- -- -- -- Connected to VCC, low-noise mode, forced fixed-frequency PWM operation. Connected to GND, normal operation, allows automatic PWM/PFM switchover for pulse skipping at light load, resulting in highest efficiency.
SKIP = off
--
--
2
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MAX1715 Evaluation Kit Evaluates: MAX1715
Table 3. Jumpers JU1/JU2/JU3 Functions (Switching Frequency Selection)
JU1 Not Installed Installed Not Installed Not Installed JU2 Not Installed Not Installed Installed Not Installed ON2 PIN Not Installed Not Installed Not Installed Installed Floating Connected to VCC Connected to REF Connected to GND JU3 FREQUENCY (kHz) 255/345 170/230 340/460 470/630
IMPORTANT: Don't change the operating frequency without first recalculating component values because the frequency has a significant effect on the peak current-limit level, MOSFET heating, preferred inductor value, PFM/PWM switchover point, output noise, efficiency, and other critical parameters.
Table 4. Jumper JU4 Functions (Output Voltage Selection)
SHUNT LOCATION Installed Not Installed Connected to VCC Connected to GND through R2 FB1 PIN MAX1715 OUTPUTS VOUT1 = 3.3V VOUT1 = 1.8V
Table 5. Jumper JU5 Functions (Fixed/Adjustable Current Limit Selection for VOUT1)
SHUNT LOCATION Installed Not Installed Connected to VCC Connected to GND through R9. Refer to the Current-Limit Circuit section in the MAX1715 data sheet for information on selecting R9. ILIM1 PIN CURRENT-LIMIT THRESHOLD 100mV (default) Adjustable between 50mV and 200mV
Table 6. Jumper JU6 Functions (Fixed/Adjustable Current Limit Selection for VOUT2)
SHUNT LOCATION Installed Not Installed Connected to VCC Connected to GND through R10. Refer to the Current-Limit Circuit section in the MAX1715 data sheet for information on selecting R10. ILIM2 PIN CURRENT-LIMIT THRESHOLD 100mV (default) Adjustable between 50mV and 200mV
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Evaluates: MAX1715
MAX1715 Evaluation Kit
Figure 1. MAX1715 EV Kit Schematic
C1 10F 25V VBIAS +5V VDD VCC D3 C14 3.3F 10V 4 20 VDD BST2 5 17 16 7 DL2 D2 PGND C13 1000pF 1 OUT1 OUT2 14 FB2 GND 5 TON PGOOD ILIM2 ON2 11 6 SKIP 12 7 R5 100k 8 13 C12 1000pF FB1 REF R4 10k 1% PGOOD VDD JU6 SHORTED (PC TRACE) JU5 VCC SHORTED (PC TRACE) SW1B 2 SW1A 5 6 4 R6 1M R7 1M R8 1M MAX1715 "NO-CONNECT" PINS: 15, 23, 28 1 SW1C 3 VCC C11 OPEN 2 9 JU2 VCC 340/460kHz C7 0.22F JU1 170/230kHz 3 ILIM1 ON1 10 R9 OPEN JU3 470/630kHz FLOAT = 255/345kHz R11 100 REF 2V C10 OPEN 22 R12 100 19 2 8 N2A 1 C6 0.1F 3 L2 4.7H 4 6 N2B DH2 18 V+ VCC 25 5 4 DH1 LX1 27 26 6 N1B L1 3.9H 3 C5 0.1F 7 BST1 21 R13 20 C9 4.7F 16V C8 1F 10V C2 10F 25V VOUT2 2.5V 4A
4
U1 MAX1715
LX2 D1 8 N1A 1 2 DL1 24 R3 OPEN C4 330F 6.3V R10 OPEN
VBATT 5V to 24V
VOUT1 1.8V 4A
C3 330F 6.3V
R1 OPEN
VCC
JU4
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R2 10k 1%
GND
NOTE: HEAVY LINES DENOTE HIGH-CURRENT PATHS.
MAX1715 Evaluation Kit Evaluates: MAX1715
1.0"
1.0"
Figure 2. MAX1715 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1715 EV Kit Component Placement Guide-- Solder Side
1.0"
1.0"
Figure 4. MAX1715 EV Kit PC Board Layout--Component Side
Figure 5. MAX1715 EV Kit PC Board Layout--GND Layer 2
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MAX1715 Evaluation Kit Evaluates: MAX1715
1.0"
1.0"
Figure 6. MAX1715 EV Kit PC Board Layout--GND Layer 3
Figure 7. MAX1715 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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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