MAX1678 Evaluation MAX1678 evaluation kit) provides regulated 3.3

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MAX1678 Evaluation MAX1678 evaluation kit) provides regulated 3.3

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19-1381; 7/98
MAX1678 Evaluation
MAX1678 evaluation kit) provides regulated 3.3V output while operating input voltages 0.7V with guaranteed start-up 0.87V. input source 2-cell battery supply. Efficiency typically with output loads 100mA. uses surface-mount components fully assembled tested quick evaluation. Jumpers provided selecting adjustable output voltage shutdown control. 0.87V VOUT Input Range Synchronous Rectified-No External Diode Required 3.3V Output Voltage Adjustable) 100mA Output Efficiency Shutdown Current Small Surface-Mount Components Inductor Damping Switch Suppresses
Features
Evaluates: MAX1678
Component List
DESIGNATION DESCRIPTION 10µF, ceramic capacitor Taiyo Yuden LMK325BJ106MN, C3225X5R1A106M 47µH, 240mA power inductor Coilcraft DS1608C-473 Sumida CD43-470 Murata LQH4N470K 3-pin jumper 2-pin jumper resistors Open 100k resistor MAX1678EUA Shunts MAX1678 board MAX1678 data sheet
Ordering Information
PART MAX1678EVKIT TEMP. RANGE +70°C PACKAGE µMAX
None None None
_Quick Start
MAX1678 shipped fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed. Verify that shunts positioned jumpers listed Table 3.3V output. Connect +0.87V +3.3V supply voltage pad. Connect ground pad. Note: once started, input voltage drop 0.7V output current less than 10mA. Connect voltmeter load any) VOUT pad.
Component Suppliers
SUPPLIER Coilcraft Coiltronics Murata Sumida Taiyo Yuden PHONE 847-639-6400 561-241-7876 814-237-1431 847-956-0666 408-573-4150 847-390-4373 847-639-1469 561-241-9339 814-238-0490 847-956-0702 408-573-4159 847-390-4428
Turn power verify that output voltage +3.3V.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 408-737-7600 ext. 3468.
MAX1678 Evaluation Evaluates: MAX1678
Detailed Description
Jumper Selections
jumpers board allow selection several configurations. Table lists jumper functions. Table lists jumper positions when setting board 3.3V operation.
Component Selection
final circuit performance determined quality components surrounding MAX1678. input output capacitors must have equivalent-seriesresistance (ESR) handle high peak currents found switching regulators. especially critical low-voltage circuits reduce output ripple. Ceramic capacitors supplied MAX1678 because their small size value range needed circuit.
MAX1678 OPERATION MAX1678 enabled. MAX1678 disabled. SHDN must driven signal connected SHDN pad. VOUT preset 3.3V. resistor must installed output voltage. MAX1678 data sheet more information.
Table Jumper Functions
JUMPER SHUNT POSITION Open Shorted Open CONNECTION SHDN connected BATT SHDN connected SHDN controlled board connected connected resistor-divider
Table Jumper Positions Normal 3.3V Operation
JUMPER SHUNT POSITION Shorted CONNECTION SHDN connected BATT connected MAX1678 OPERATION MAX1678 enabled. VOUT preset 3.3V.
47µH BATT SHDN OPEN 10µF BATT
SHDN
10µF
OPEN
MAX1678
100k
Figure MAX1678 Schematic
MAX1678 Evaluation Evaluates: MAX1678
1.0"
Figure Component Placement Guide-Component Side
1.0"
Figure Board Layout-Component Side
1.0"
Figure Board Layout-Solder Side
MAX1678 Evaluation Evaluates: MAX1678
NOTES
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 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1678 Evaluation MAX1678 evaluation kit) provides regulated 3.3

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