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19-2089; Rev 0; 7/01
MAX1708 Evaluation Kit
General Description
The MAX1708 evaluation kit (EV kit) is a step-up DC-DC switching regulator for 1- to 3-cell battery inputs as well as +2.5V or +3.3V regulated supply inputs. The EV kit accepts a positive input between 0.7V and VOUT, and converts it to a higher, pin-selectable output voltage. Efficiency is up to 90% with output load currents to 2A. This EV kit operates at fixed 600kHz PWM frequency, allowing the use of a small inductor. A movable jumper on the EV kit selects either a +3.3V or +5V output voltage. Additional pads on the board accommodate the resistors for output adjustment. This EV kit uses surface-mount components and is fully assembled and tested for quick evaluation. o 0.7V to VOUT Input Voltage Range o Pin-Selectable +3.3V or +5V Output Voltage (+5V as Shipped) o Adjustable Output Voltage (+2.5V to +5.5V, External Divider) o Up to 2A Output Current o 600kHz PWM Operation o Internal 5A MOSFET Switch o 1A IC Shutdown Current o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX1708
Ordering Information
PART MAX1708EVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 QSOP
Component List
DESIGNATION C1, C4 QTY 0 DESCRIPTION Not installed (D case) 150F, 6.3V low-ESR capacitor (D case) Sanyo 6TPB150M or Panasonic EEFUE0J151R 150F, 6.3V 15m low-ESR capacitor (D case) Panasonic EEFUE0J151R 0.1F ceramic capacitors (1206) 0.22F ceramic capacitor (1206) 1F, 16V ceramic capacitor (1206) Taiyo Yuden EMK316BJ105KL or TDK C3216X7R1C105M 5A Schottky diode (SMC case) Central Semiconductor CMSH5-20 or CMSH5-40 DESIGNATION QTY DESCRIPTION 2.2H power inductor Coilcraft DO3316P-222HC (unshielded) or Coiltronics UP2B2R2 (unshielded) or Sumida CDRH104R-2R5 (2.5H, shielded) Not installed (1206) Not installed, (short PC trace) (1206) 2 5% resistor (1206) 1M 5% resistors (1206) MAX1708EEE (16-pinQSOP) 2-pin headers Shunts MAX1708 PC board MAX1708 EV kit data sheet MAX1708 data sheet
C2
1
L1
1
C3 C5, C6, C10 C7 C8
1 3 1 1
R1, R3 R2 R4 R5-R8 U1 JU1, JU2, JU3 None None None None
0 0 1 4 1 3 3 1 1 1
D1
1
________________________________________________________________ Maxim Integrated Products
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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.
MAX1708 Evaluation Kit Evaluates: MAX1708
Component Suppliers
SUPPLIER Central Semiconductor Coilcraft Coiltronics Panasonic Sanyo Sumida Taiyo Yuden TDK PHONE 631-435-1110 847-639-6400 561-752-5000 714-373-7334 619-661-6835 847-545-6700 408-573-4150 847-803-6100 FAX 631-435-1824 847-639-1469 561-742-0134 714-373-7323 619-661-1055 847-545-6720 408-573-4159 847-390-4405
4) Turn on the power supply and verify that the output voltage is 5V. Refer to the MAX1708 data sheet for output load during start up. 5) For other output voltages, refer to Setting the Output Voltage in the MAX1708 data sheet for instructions on selecting the feedback resistors R1 and R2.
Detailed Description
The MAX1708 EV kit provides a pin-selectable +3.3V or +5V output from a +0.7V to VOUT input voltage. The output voltage can also be adjusted with external resistors for voltages between +2.5V to +5.5V. The MAX1708 includes an internal MOSFET switch with a typical peak current limit of 5A, and which can deliver loads up to 2A. Connecting an external resistor from SS/ILIM to GND (R3) can also reduce the current limit. Connecting a capacitor from SS/ILIM to GND (C6) sets the soft-start rate. The EV kit operates at 600kHz switching frequency and allows the use of a small inductor value. The switching frequency can also be synchronized to an external clock ranging from 350kHz to 1MHz.
Note: Please indicate that you are using the MAX1708 when contacting these component suppliers.
Quick Start
The MAX1708 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 +3V supply to the VIN pad. Connect ground to the GND pad. 2) Connect a voltmeter to the VOUT pad. 3) Remove all the shunts from JU1, JU2, JU3.
Jumper Selection
Three jumpers on the PC board allow the user to select several configurations. Table 1 lists the jumpers and their functions.
Table 1. Jumper Functions
JUMPER JU1 JU2 SHUNT LOCATION Not Installed Installed Not Installed Installed Not Installed Installed JU3 Installed 3.3 /5 connected to GND and resistor R1 and R2 are installed PIN CONNECTION ONB connected to GND ONB connected to VOUT ONA connected to GND ONA connected to VOUT 3.3 /5 connected to VOUT 3.3 /5 connected to GND MAX1708 OPERATION MAX1708 is enabled if ONA = VOUT MAX1708 is disabled if ONA = GND MAX1708 is disabled if ONB = VOUT MAX1708 is enabled if ONB = GND VOUT is set to 5V. FB pin must be connected to ground (R2 = short) VOUT is set to 3.3V. FB pin must be connected to ground (R2 = short) VOUT = adjustable between +2.5V to +5.5V range. Refer to Setting the Output Voltage in the MAX1708 data sheet for instructions on selecting the feedback resistors R1 and R2. Also cut the PC trace, shorting R2
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MAX1708 Evaluation Kit Evaluates: MAX1708
VIN VOUT GND JU1 ONB VOUT 1 R5 1M ONB LX LX LX PGND 2 VOUT R7 1M CLK 16 CLK R6 1M ONA PGND PGND OUT 10 C5 0.1F 11 VOUT SS/LIM R8 1M 8 C7 0.22F 6 REF GND 3.3/5 GND 15 9 JU3 3 4 5 12 13 14 R4 2 R1 OPEN C3 150F 6.3V C4 OPEN C8 1F 16V C10 0.1F D1 VOUT 5V AT 2A L1 2.2H C2 150F 6.3V C1 OPEN
JU2 ONA
GND
U1 MAX1708
FB 7 R3 OPEN C6 0.1F
R2 SHORT (PC TRACE)
REF 1.25V
Figure 1. MAX1708 EV Kit Schematic
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MAX1708 Evaluation Kit Evaluates: MAX1708
1.0"
1.0"
Figure 2. MAX1708 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1708 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX1708 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) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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