MAX1692 Evaluation MAX1692 evaluation kit) fully assembled tested

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MAX1692 Evaluation MAX1692 evaluation kit) fully assembled tested

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19-1400; 11/98
MAX1692 Evaluation
MAX1692 evaluation kit) fully assembled tested surface-mount circuit board that contains pulse-width-modulated (PWM), step-down DC-DC converter. provides +2.5V output voltage from +2.7V +5.5V input source. delivers 600mA output current. MAX1692 features internal MOSFET switches, dropout voltage, 1.2%-accurate 1.25V reference. MAX1692 provides quiescent current high efficiency 95%) maximum battery life. Operation 750kHz allows tiny surface-mount inductor. +2.7V +5.5V Input Voltage Range +2.5V Output Voltage Adjustable Output from 1.25V 600mA Output Current 100% Duty Cycle Dropout 750kHz Fixed-Frequency Operation Internal MOSFET Switch Synchronous Rectifier 0.1µA Shutdown Current Surface-Mount Components Fully Assembled Tested
Features
Evaluates: MAX1692
Component List
DESIGNATION DESCRIPTION 10µF, 6.3V, ceramic capacitor Taiyo Yuden JMK325BJ106MN 47µF, 6.3V, ESR, electrolytic capacitor, Sanyo 6TPA47M 47µF, tantalum capacitor Sprague 594D476X0016C2T 0.1µF ceramic capacitor 0.22µF ceramic capacitor 47pF ceramic capacitor 10µH inductor Sumida CDR63B-100 (shielded) CD43-100 (unshielded) 309k, resistor 301k, resistor 100k, resistor MAX1692EUB 3-pin header Shunt (JU1) 2-pin header MAX1692 Board MAX1692 data sheet
Ordering Information
PART MAX1692EVKIT TEMP. RANGE +70°C IC-PACKAGE µMAX
None None None
Quick Start
MAX1692 fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed. Connect +2.7V +5.5V supply pad. Connect ground pad. Connect voltmeter VOUT pad. Verify that shunt across pins Turn power supply verify that output +2.5V.
Detailed Description
Jumper Selection
Shutdown Mode MAX1692 features shutdown mode that reduces MAX1692 IC's quiescent current 0.1µA, preserving battery life. 3-pin header, JU1, selects shutdown mode (Table
Component Suppliers
SUPPLIER Dale-Vishay Sanyo Sprague Sumida Taiyo Yuden PHONE 402-564-3131 619-661-6835 603-224-1961 708-956-0666 408-573-4150 402-563-6418 619-661-1055 603-224-1430 708-956-0702 408-573-4159
Table Jumper Functions
SHUNT LOCATION SHDN Connected MAX1692 OUTPUT MAX1692 enabled, VOUT
Note: Please indicate that using MAX1692 when contacting these component suppliers.
Connected Shutdown mode, VOUT
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
MAX1692 Evaluation Evaluates: MAX1692
Table Jumper Functions
SHUNT LOCATION SYNC/PWM Connected Pulled 100k (not installed) Driven from external clock OPERATING MODE MAX1692 operates low-noise mode. MAX1692 operates PWM/PFM mode. SYNC/PWM driven external clock between 500kHz 1000kHz.
Table R1/R2 Other Output Voltages
VOUT 1.50 1.80 2.50 2.70 3.32 (1%) 66.5k 140k 309k 357k 511k (1%) 301k 301k 301k 301k 301k
Changing Current Limit
inductor current limit 0.6A 1.2A. factory-configured 1.2A limit. limit 0.6A, trace shorting pins then short pins This allows smallest possible inductor low-current applications.
Operating Mode
MAX1692 operates three modes optimize performance. fixed-frequency (PWM) mode switches fixed frequency easy post-filtering. synchronizable mode uses external clock control harmonics. PWM/PFM mode extends battery life operating mode under heavy loads mode under light loads reduced power consumption. operates 750kHz switching frequency allows small-value inductor. switching frequency also synchronized external clock ranging from 500kHz 1000kHz. 2pin header selects operating mode (Table
Evaluating Other Output Voltages
kit's output +2.50V connecting resistor-divider R1/R2. However, output voltage also adjusted between +1.232V changing values. Select feedback resistor 500k range. then given [(VOUT VFB) where 1.232V VOUT output voltage. unloaded output voltage typically above nominal output voltage. Table lists values different output voltages.
2.7V 5.5V
10µF 6.3V 0.1µF
10µH 47µF 6.3V 309k 301k 47pF
VOUT 2.5V
MAX1692
PGND
SHDN
SHDN
SYNC/PWM 100k 0.22µF
SYNC/PWM
Figure MAX1692 Schematic
MAX1692 Evaluation Evaluates: MAX1692
1.0"
Figure MAX1692 Component Placement Guide- Component Side
1.0"
Figure MAX1692 Board Layout-Component Side
1.0"
Figure MAX1692 Board Layout-Solder Side
MAX1692 Evaluation Evaluates: MAX1692
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.

MAX1692 Evaluation MAX1692 evaluation kit) fully assembled tested

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