MAX1698 Evaluation MAX1698 evaluation kit) fully assembled tested

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MAX1698 Evaluation MAX1698 evaluation kit) fully assembled tested

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MAX1698 Evaluation
MAX1698 evaluation kit) fully assembled tested circuit board that contains boost switching-regulator current source array white LEDs. configured, circuit drive banks series arrays 20mA each; however, wide variety other configurations possible. powered from separate +2.7VDC +5.5VDC input, while power wider input range supplied either from logic supply battery source. MAX1698 features digital soft-start adjustable lossless current control. MAX1698 demonstrates quiescent current, open-circuit protection, efficiency maximum battery life. Operation 500kHz allows tiny surface-mount components. Input Voltage Down +0.8V White Array Potentiometer-Adjustable Output Current Level (LED Brightness Control) External Low-Loss N-Channel Switch 10nA Shutdown Current Operation 500kHz Switching Frequency Surface-Mount Components Fully Assembled Tested
Features
Evaluates: MAX1698
Component List
DESIGNATION DESCRIPTION 10µF, ceramic (1812) Taiyo Yuden TMK432BJ106KM 1µF, ceramic (1206) Taiyo Yuden TMK316BJ105KL Murata GRM42-6X7R105K025A 1µF, 6.3V ceramic (0603) Taiyo Yuden JMK107BJ105KA 40V, 0.5A Schottky diode (SOD-123) Motorola MBR0540T1 Nihon EP05Q04 24V, 350mW zener diode (SOT-23) Central Semiconductor CMPZ5253B White LEDs Nichia NSPW500BS (T-1-3/4) 10µH inductor Sumida CDRH5D18-100NC 30V, 2.2A, N-channel MOSFET (SuperSOTTM-3) Fairchild Semiconductor FDN337N 500k potentiometer Bourns 3352E-1-504 resistors (0805) MAX1698EUB (10-pin µMAX) 3-pin header Shunt (JU1) MAX1698 board MAX1698 data sheet MAX1698 data sheet PART MAX1698EVKIT
Ordering Information
TEMP. RANGE +70°C PACKAGE µMAX
Component Suppliers
SUPPLIER Central Semiconductor Fairchild Motorola Murata Nichia America Corporation Nihon Sumida Taiyo Yuden PHONE 516-435-1110 408-822-2000 602-303-5454 814-956-0666 408-573-0933 661-867-2555 708-956-0666 408-573-4150 516-435-1824 408-822-2102 602-994-6430 847-238-0490 408-573-0934 661-867-2698 708-956-0702 408-573-4159
D3-D11
Note: Please indicate that using MAX1698 when contacting these component suppliers. SuperSOT trademark Fairchild Semiconductor.
None None None None
Quick Start
MAX1698 fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed.
Maxim Integrated Products
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
MAX1698 Evaluation Evaluates: MAX1698
Main Output
Connect +2.7V +5.5V supply pad. Connect ground pad. Connect +0.8V supply VBATT pad. Connect ground pad. Connect voltmeter VOUT pad. Verify that shunt (SHDN) across pins Rotate potentiometer (R1) midposition. Turn power supply, verify that output approximately 9.0V LEDs moderately lit. instructions selecting other means adjusting brightness, refer Adjusting Current section MAX1698 data sheet.
Changing Maximum Current
maximum current determined feedback resistor current 300mV Resistors must also match value balance current each bank. Refer Setting Output Current section MAX1698 data sheet more information selecting other maximum current settings.
Evaluating Off-Board LEDs
MAX1698 evaluate off-board LEDs. Current resistors must removed from kit. LEDs will longer function. external feedback resistor must connected between pad. Refer Setting Output Current section MAX1698 data sheet more information selecting maximum currentsetting resistor.
Detailed Description
MAX1698 contains switching-regulator current-source circuit. circuit requires +2.7V +5.5V power (VCC); however, power input (VBATT) accept wide input voltage range from +0.8V forward voltage array (+7V array supplied kit). board drive +24V output, limited open-circuit protection zener (D2). Output current adjusted with control brightness. boost converter operates maximum frequency 500kHz. MAX1698 evaluate additional off-board LEDs. instructions evaluating additional LEDs, Evaluating Off-Board LEDs section.
Evaluating Output Voltages Over +24V
Zener diode clamps output voltage VOUT +24V array circuit opens. evaluate output voltages greater than +24V, zener diode must replaced. Choose zener diode above maximum MOSFET breakdown voltage should exceed zener voltage. Output capacitor C2's voltage rating must exceed zener diode voltage.
Table Jumper Functions
SHUNT LOCATION SHDN Connected Connected MAX1698 OUTPUT MAX1698 enabled, VOUT +24V Shutdown mode, VOUT
Jumper Selection Shutdown Mode
MAX1698 features shutdown mode that reduces MAX1698 quiescent current less than (max), preserving battery life. three-pin jumper (JU1) selects shutdown mode circuit. Table lists selectable jumper options.
VBATT +0.8V +7.0V 10µH VOUT
Figure MAX1698 Schematic
10µF
+2.7V +5.5V
SHDN AGND ZENER PGND 500k
MAX1698EUB
Evaluates: MAX1698
SHDN
MAX1698 Evaluation
MAX1698 Evaluation Evaluates: MAX1698
1.0"
1.0"
Figure MAX1698 Component Placement Guide- Component Side
Figure MAX1698 Board Layout-Component Side
1.0"
Figure MAX1698 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 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1698 Evaluation MAX1698 evaluation kit) fully assembled tested

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