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LT1111CN8-12 Datasheet(PDF) 1 Page - Linear Technology |
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LT1111CN8-12 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1111 1111fd TYPICAL APPLICATIO APPLICATIO S DESCRIPTIO FEATURES 33 F SUMIDA CD54-220M 22 µH LT1111 • TA01 µ MBRS120T3 5V 100mA GND SW2 SW1 LIM I IN V LT1111CS8-5 SENSE 3V INPUT 10 F* µ + *OPTIONAL + Micropower DC/DC Converter Adjustable and Fixed 5V, 12V All Surface Mount 3V to 5V Step-Up Converter Typical Load Regulation 0 LOAD CURRENT (mA) 0 1 2 3 4 5 6 50 100 150 200 LT1111 • TA02 25 75 125 175 VIN = 2V 2.2 2.4 2.6 2.8 3V s Operates at Supply Voltages from 2V to 30V s Works with Surface Mount Inductors s 72kHz Oscillator s Only Three External Components Required s Step-Up or Step-Down Mode s Low-Battery Detector Comparator On-Chip s User Adjustable Current Limit s Internal 1A Power Switch s Fixed or Adjustable Output Voltage Versions s Space Saving 8-Pin MiniDIP or SO-8 Package s 3V to 5V, 5V to 12V Converters s 9V to 5V, 12V to 5V Converters s Remote Controls s Peripherals and Add-On Cards s Battery Backup Supplies s Uninterruptible Supplies s Laptop and Palmtop Computers s Cellular Telephones s Portable Instruments s Flash Memory VPP Generators The LT ®1111 is a versatile micropower DC/DC converter. The device requires only three external components to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2V to 12V in step-up mode and to 30V in step-down mode. The LT1111 functions equally well in step-up, step- down, or inverting applications. The LT1111 oscillator is set at 72kHz, optimizing the device to work with off-the-shelf surface mount inductors. The device can deliver 5V at 100mA from a 3V input in step-up mode or 5V at 200mA from a 12V input in step- down mode. Switch current limit can be programmed with a single resistor. An auxiliary open-collector gain block can be configured as a low-battery detector, linear post regulator, undervoltage lock-out circuit, or error amplifier. For input sources of less than 2V use the LT1110. , LTC and LT are registered trademarks of Linear Technology Corporation |
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