MAX1708 Evaluation MAX1708 evaluation kit) step-up DC-DC switchin

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MAX1708 Evaluation MAX1708 evaluation kit) step-up DC-DC switchin

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19-2089; 7/01
MAX1708 Evaluation
MAX1708 evaluation kit) step-up DC-DC switching regulator 3-cell battery inputs well +2.5V +3.3V regulated supply inputs. accepts positive input between 0.7V VOUT, converts higher, pin-selectable output voltage. Efficiency with output load currents This operates fixed 600kHz frequency, allowing small inductor. movable jumper selects either +3.3V output voltage. Additional pads board accommodate resistors output adjustment. This uses surface-mount components fully assembled tested quick evaluation. 0.7V VOUT Input Voltage Range Pin-Selectable +3.3V Output Voltage (+5V Shipped) Adjustable Output Voltage (+2.5V +5.5V, External Divider) Output Current 600kHz Operation Internal MOSFET Switch Shutdown Current Surface-Mount Components Fully Assembled Tested
Features
Evaluates: MAX1708
Ordering Information
PART MAX1708EVKIT TEMP RANGE +70°C PACKAGE QSOP
Component List
DESIGNATION DESCRIPTION installed case) 150µF, 6.3V low-ESR capacitor case) Sanyo 6TPB150M Panasonic EEFUE0J151R 150µF, 6.3V low-ESR capacitor case) Panasonic EEFUE0J151R 0.1µF ceramic capacitors (1206) 0.22µF ceramic capacitor (1206) 1µF, ceramic capacitor (1206) Taiyo Yuden EMK316BJ105KL C3216X7R1C105M Schottky diode (SMC case) Central Semiconductor CMSH5-20 CMSH5-40 DESIGNATION DESCRIPTION 2.2µH power inductor Coilcraft DO3316P-222HC (unshielded) Coiltronics UP2B2R2 (unshielded) Sumida CDRH104R-2R5 (2.5µH, shielded) installed (1206) installed, (short trace) (1206) resistor (1206) resistors (1206) MAX1708EEE (16-pinQSOP) 2-pin headers Shunts MAX1708 board MAX1708 data sheet MAX1708 data sheet
R5-R8 JU1, JU2, None None None None
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1708 Evaluation Evaluates: MAX1708
Component Suppliers
SUPPLIER Central Semiconductor Coilcraft Coiltronics Panasonic Sanyo Sumida Taiyo Yuden 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 631-435-1824 847-639-1469 561-742-0134 714-373-7323 619-661-1055 847-545-6720 408-573-4159 847-390-4405
Turn power supply verify that output voltage Refer MAX1708 data sheet output load during start other output voltages, refer Setting Output Voltage MAX1708 data sheet instructions selecting feedback resistors
Detailed Description
MAX1708 provides pin-selectable +3.3V output from +0.7V VOUT input voltage. output voltage also adjusted with external resistors voltages between +2.5V +5.5V. MAX1708 includes internal MOSFET switch with typical peak current limit which deliver loads Connecting external resistor from SS/ILIM (R3) also reduce current limit. Connecting capacitor from SS/ILIM (C6) sets soft-start rate. operates 600kHz switching frequency allows small inductor value. switching frequency also synchronized external clock ranging from 350kHz 1MHz.
Note: Please indicate that using MAX1708 when contacting these component suppliers.
Quick Start
MAX1708 fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed. Connect supply pad. Connect ground pad. Connect voltmeter VOUT pad. Remove shunts from JU1, JU2, JU3.
Jumper Selection
Three jumpers board allow user select several configurations. Table lists jumpers their functions.
Table Jumper Functions
JUMPER SHUNT LOCATION Installed Installed Installed Installed Installed Installed Installed connected resistor installed CONNECTION connected connected VOUT connected connected VOUT connected VOUT connected MAX1708 OPERATION MAX1708 enabled VOUT MAX1708 disabled MAX1708 disabled VOUT MAX1708 enabled VOUT must connected ground short) VOUT 3.3V. must connected ground short) VOUT adjustable between +2.5V +5.5V range. Refer Setting Output Voltage MAX1708 data sheet instructions selecting feedback resistors Also trace, shorting
MAX1708 Evaluation Evaluates: MAX1708
VOUT VOUT PGND VOUT PGND PGND 0.1µF VOUT SS/LIM 0.22µF 3.3/5 OPEN 150µF 6.3V OPEN 0.1µF VOUT 2.2µH 150µF 6.3V OPEN
MAX1708
OPEN 0.1µF
SHORT TRACE)
1.25V
Figure MAX1708 Schematic
MAX1708 Evaluation Evaluates: MAX1708
1.0"
1.0"
Figure MAX1708 Component Placement Guide- Component Side
Figure MAX1708 Board Layout-Component Side
1.0"
Figure MAX1708 Board Layout-Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1708 Evaluation MAX1708 evaluation kit) step-up DC-DC switchin

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