MAX1729 Evaluation MAX1729 evaluation kit) low-power, step-up DC-

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MAX1729 Evaluation MAX1729 evaluation kit) low-power, step-up DC-

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MAX1729 Evaluation
MAX1729 evaluation kit) low-power, step-up DC-DC converter followed low-dropout linear regulator. accepts positive input voltage between 2.7V 5.5V converts output voltage ranging from 2.5V 16V. output voltage dynamically adjustable through external 3kHz 12kHz pulse-width-modulated (PWM) control signal. on-chip temperature sensor provides compensation display temperature characteristics. This makes MAX1729 ideally suited electrically controlled birefringence (ECB) bias-supply generation
Features
High-Accuracy Reference Voltage (±1%) On-Chip Temperature-Sensor Output 2.7V 5.5V Input Range Dynamic Control Output Voltage 0.4µA Typical Shutdown Current 10-Pin µMAX Package Surface-Mount Construction Fully Assembled Tested
Evaluates: MAX1729
Component List
DESIGNATION R1-R5 DESCRIPTION 0.1µF ceramic capacitors installed 0.068µF ceramic capacitor ceramic capacitors Taiyo Yuden TMK316BJ105KL 1000pF ceramic capacitor 3-pin jumper 220µH inductor Murata LQH3C221K34 installed MAX1729EUB PART MAX1729EVKIT
Ordering Information
TEMP. RANGE +70°C PACKAGE 10µMAX
Quick Start
MAX1729 fully assembled tested surface-mount board. Follow steps below verify board operation. turn power supply until connections completed. Connect 2.7V 5.5V supply pads marked GND. Connect voltmeter load, any, VOUT pad. Place shunt across pins Turn power verify that output voltage approximately 16.35V.
Component Suppliers
SUPPLIER Murata Taiyo Yuden PHONE 814-237-1431 408-573-4150 814-238-0490 408-573-4159
other output voltages, refer Output Voltage Control section.
Detailed Description
Jumper Selection
Jumper JU1, position, connects CTLIN VIN. This places output voltage maximum equivalent applying signal with 100% duty cycle. position, CTLIN connected GND. This places MAX1729 into shutdown mode equivalent applying signal with duty cycle. When applying signal CTLIN pad, shunt must removed from jumper JU1.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
MAX1729 Evaluation Evaluates: MAX1729
Table Jumper Functions
JUMPER JUMPER POSITION Open FUNCTION CTLIN high, MAX1729 enabled. Output voltage maximum value. CTLIN low, MAX1729 shutdown mode. Drive CTLIN with external signal.
Temperature Compensation
MAX1729 includes pad, which temperature-sensor output. This used compensate color contrast variations caused changes temperature. internal feedback mode, this output read external used adjust duty cycle control signal. external feedback mode, this output summed directly into feedback-resistor network. Refer MAX1729 data sheet determine feedback-resistor values.
Output Voltage Control
output voltage MAX1729 dynamically adjustable through 3kHz 12kHz control signal applied CTLIN pad. output adjustable from 2.5V internal feedback mode from 2.5V external feedback mode. initially internal feedback operation. external feedback operation, traces across insert resistors R1-R5. Refer MAX1729 data sheet determine resistor values.
220µH
OPEN CTLIN
0.1µF 0.1µF
0.068µF
MAX1729
OPEN
VOUT
CTLIN COMP SHORT TRACE)
SHORT TRACE)
OPEN
1000pF
OPEN
Figure MAX1729 Schematic
MAX1729 Evaluation Evaluates: MAX1729
1.0"
Figure Component Placement Guide-Component Side
1.0"
Figure Board Layout-Component Side
1.0"
Figure Board Layout-Solder Side
MAX1729 Evaluation Evaluates: MAX1729
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 1999 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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