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LT1107-5 Datasheet(PDF) 1 Page - Linear Technology |
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LT1107-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1107 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V APPLICATI TYPICAL Efficiency DESCRIPTIO S FEATURE s Operates at Supply Voltages from 2V to 30V s Consumes Only 320 µA Supply Current s Works in Step-Up or Step-Down Mode s Only Three External Components Required 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 The LT1107 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 LT1107 functions equally well in step-up, step- down, or inverting applications. The LT1107 is pin-for-pin compatible with the LT1111, but has a duty cycle of 70%, resulting in increased output current in many applications. The LT1107 can deliver 150mA at 5V from a 2AA cell input and 5V at 300mA from 24V in step-down mode. Quiescent current is just 320 µA, making the LT1107 ideal for power-conscious battery- operated systems. The 63kHz oscillator is optimized to work with surface mount inductors and capacitors. 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, undervoltage lock-out circuit, or error amplifier. S APPLICATI s Palmtop Computers s 3V to 5V, 5V to 12V Converters s 24V to 5V, 12V to 5V Converters s LCD Bias Generators s Peripherals and Add-On Cards s Battery Backup Supplies s Cellular Telephones s Portable Instruments LOAD CURRENT (mA) 1 82 80 78 76 74 72 70 68 66 64 10 100 400 1107 TA02 VIN = 3V VIN = 2.5V VIN = 2V + 5V 150mA + MBRS120T3 L1* 33 µH 47 Ω 2 × AA ALKALINE CELLS 100 µF SUMIDA CD54-330K COILCRAFT DT3316-473 * ILIM VIN SENSE SW1 SW2 GND 47 µF LT1107-5 1107 TA01 Palmtop Computer Logic Supply |
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