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LT1108CN8-5 Datasheet(PDF) 1 Page - Linear Technology |
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LT1108CN8-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1108 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V DESCRIPTIO S FEATURE The LT1108 is a versatile micropower DC/DC converter. The device requires only four 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 LT1108 functions equally well in step-up, step- down, or inverting applications. The LT1108 is pin-for-pin compatible with the LT1173, but has a duty cycle of 70%, resulting in increased output current in many applications. The LT1108 can deliver 150mA at 5V from a 2 AA cell input and 5V at 300mA from 9V in step-down mode. Quiescent current is just 110 µA, making the LT1108 ideal for power conscious battery- operated systems. 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 Operates at Supply Voltages from 2V to 30V s Consumes Only 110 µA Supply Current s Works in Step-Up or Step-Down Mode s Only Four 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 S8 Package S APPLICATI s Palmtop Computers s 3V to 5V, 5V to 12V Converters s 9V 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 APPLICATI TYPICAL LOAD CURRENT (mA) 1 78 80 82 84 10 100 LT1108 • TA02 76 74 72 70 VIN = 3V VIN = 2.5V VIN = 2V AVX TPS 330 µF 6.3V L1* 100 µH LT1108 • TA01 1N5817 5V 150mA GND SW2 SW1 ILIM VIN LT1108-5 SENSE 100 µF + *L1 = + 2 × AA CELLS GOWANDA GA20-103K COILTRONICS CTX100-4 SUMIDA CD105-101K 47 Ω Efficiency Palmtop Computer Logic Supply |
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