LT1173 Datasheet | Linear Technology

LT1173 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V Features s s s s s s s s s DESCRIPTIO Operates at Supply Voltages From 2.0V to 30V Consumes Only 110µA Supply Current Works in Step-Up or Step-Down Mode Only Three External ponents Required Low Battery Detector parator On-Chip User-Adjustable Current Limit Internal 1A Power Switch Fixed or Adjustable Output Voltage Versions Space Saving 8-Pin Mini DIP or SO8 Package The LT1173 is a versatile micropower DC-DC converter. The device requires only three external ponents to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2.0V to 12V in step-up mode and to 30V in step-down mode. The LT1173 functions equally well in step-up, stepdown or inverting applications. The LT1173 consumes just 110µA supply current at standby, making it ideal for applications where low quiescent current is important. The device can deliver 5V at 80m A from a 3V input in step-up mode or 5V at 200m A from a 12V input in step-down mode. Switch current limit can be programmed with a single resistor. An auxiliary gain block can be configured as a low battery detector, linear post regulator, under voltage lockout circuit or error amplifier. For input sources of less than 2V, use the LT1073. APPLICATI s s s s s s s s s Flash Memory Vpp Generators 3V to 5V, 5V to 12V Converters 9V to 5V, 12V to 5V Converters LCD Bias Generators Peripherals and Add-On Cards Battery Backup Supplies Laptop and Palmtop puters Cellular Telephones Portable Instruments and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. TYPICAL APPLICATI L1- 100µH 5VIN 47Ω I LIM 10 µ F V IN SW1 VPP Output 12V 100m A Logic Controlled Flash Memory VPP Generator 1N5818 VOUT 5V/DIV 1.07M† + + LT1173 FB SW2 SANYO OS-CON 100 µ F 0V 124k† PROGRAM 5V/DIV 5ms/DIV 1173 TA02 1N4148 PROGRAM - TA01 - L1 = GOWANDA GA20-103K COILTRONICS CTX100-4 NO OVERSHOOT EFFICIENCY = 81% † = 1% METAL...