MAX1701 Evaluation MAX1701 evaluation provides regulated 3.3V out

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MAX1701 Evaluation MAX1701 evaluation provides regulated 3.3V out

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MAX1701 Evaluation
MAX1701 evaluation provides regulated 3.3V output while operating input voltages 0.7V. input source 2-cell battery. Efficiency with output loads 200mA. kit, which uses surface-mount components, fully assembled tested quick evaluation. Jumpers provided select output voltage, switching mode, shutdown control. This also used evaluate MAX1700. Simply order free sample MAX1700EEE replace MAX1701EEE that comes installed board.
_Features
3.3V Output 200mA Output 0.7V 3.5V Input Efficiency Shutdown Current 300kHz Operation Optional Low-Power Mode Small Surface-Mount Components
Evaluates: MAX1700/MAX1701
_Component List
DESIGNATION DESCRIPTION 22µF, 25V, low-ESR tantalum capacitor TPSD226M025R0200 Sprague 593D226X0025D 0.22µF, ceramic capacitors 0.10µF, ceramic capacitor 100µF, low-ESR tantalum capacitor TPSD107M010R0100 Sprague 593D107X0010D7 installed. Space optional user capacitor. 0.5A, Schottky diode Motorola MBR0520L 3-pin jumpers 2-pin jumpers 10µH, 1.6A power inductor CoilCraft DO3316-103, Coiltronics UP1B-100, Sumida CDR74B-100 100k, resistors installed 100k, resistors resistors resistor MAX1701EEE Shunts 3.4" 2.4" printed circuit board MAX1700/MAX1701 data sheet
_Ordering Information
PART MAX1701EVKIT TEMP. RANGE +70°C PIN-PACKAGE 16-pin QSOP
_Component Suppliers
SUPPLIER Coilcraft Coiltronics Sprague Sumida Motorola PHONE (803) 946-0690 (847) 639-6400 (561) 241-7876 (603) 224-1961 (847) 956-0666 (303) 675-2140 (803) 626-3123 (847) 639-1469 (561) 241-9339 (603) 224-1430 (847) 956-0702 (303) 675-2150
_Quick Start
MAX1701 shipped fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed. Verify that shunts connected listed Table 3.3V output. Connect +1.1V +3.3V supply marked VIN. ground connects pad. Note: input voltage drop 0.7V after startup. Connect voltmeter VOUT pad. Turn power verify that output voltage 3.3V. Connect load any).
R10, R11, None None None
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
MAX1701 Evaluation Evaluates: MAX1700/MAX1701
_Detailed Description
Jumper Selection
Five jumpers printed circuit board allow user selection several configurations. Table lists jumpers their functions. Table lists jumper positions when board normal 3.3V output operation.
Component Selection
final circuit performance determined quality components surrounding MAX1701. power inductor must saturate 1.6A maximum peak current produced MAX1701. Inductors Component List have high current ratings coil resistance.
Table Jumper Functions
JUMPER SHUNT LOCATION Open Open Open Shorted Open Shorted Open CLK/SEL connected CLK/SEL connected connected resistor divider Shorted normal operation Pull-ups disconnected CONNECTION connected connected VOUT controlled board connected connected VOUT controlled board CLK/SEL connected CLK/SEL connected VOUT MAX1701 OPERATION MAX1701 disabled VOUT. MAX1701 enabled. must driven signal connected pad. MAX1701 enabled. MAX1701 disabled GND. must driven signal connected pad. Low-power mode, MAX1701 operates mode. High-power mode, MAX1701 operates mode. CLK/SEL driven external source select power mode, 200kHz 400kHz signal control switching frequency. VOUT preset 3.3V. Resistors must installed proper circuit operation. VOUT connected pull-up resistors. R7-R9 disconnected that MAX1701 shutdown current verified.
Table Jumper Position Normal 3.3V Operation
JUMPER SHUNT LOCATION CONNECTION connected VOUT connected CLK/SEL connected VOUT MAX1701 OPERATION MAX1701 enabled. MAX1701 enabled. High-power mode, MAX1701 operates mode. VOUT preset 3.3V. This jumper must shorted resistors installed proper circuit operation.
Shorted Shorted
connected VOUT connected pull-up resistors
MAX1701 Evaluation
input output capacitors must have equivalent series resistance (ESR) handle high peak currents found switching regulators. especially critical low-voltage circuits reduce voltage across capacitors. higher output capacitor will increase output ripple. Consider using parallel capacitors reduce total application requires lower output ripple. additional output capacitor (C6) required output current greater than 200mA output voltages less than 3.3V. low-ESR input capacitor must located physically close inductor. Schottky diode must connected between close possible. Schottky diode specified lower forward voltage drop well fast switching characteristic. Most Schottky diodes with sufficient current rating will work. diode evaluation board selected small size. separate low-noise ground plane connects reference signal grounds. This low-noise ground plane then connected power-ground plane PGND (Figure
Evaluates: MAX1700/MAX1701
0.7V 3.5V 22µF
OPEN 100k 0.22µF
10µH 100µF 0.22µF OPEN 100k 100k 100k 100k BATT 0.1µF OPEN VOUT
POUT
OPEN
MAX1701
VOUT
CLK/SEL CLK/SEL PGND 100k OPEN
Figure MAX1701 Schematic
MAX1701 Evaluation Evaluates: MAX1700/MAX1701
1.0"
1.0"
Figure MAX1701 Component Placement Guide
Figure MAX1701 Board Layout-Component Side
1.0"
Figure MAX1701 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 1999 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1701 Evaluation MAX1701 evaluation provides regulated 3.3V out

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