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LT1108

Linear Technology
Part Number LT1108
Manufacturer Linear Technology
Description Micropower DC/DC Converter
Published Mar 22, 2005
Detailed Description LT1108 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V FEATURES s s s s s s s s s DESCRIPTIO Operates at Supp...
Datasheet PDF File LT1108 PDF File

LT1108
LT1108

Overview
LT1108 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 2V to 30V Consumes Only 110µA Supply Current Works in Step-Up or Step-Down Mode Only Four External Components Required Low Battery Detector Comparator On-Chip User Adjustable Current Limit Internal 1A Power Switch Fixed or Adjustable Output Voltage Versions Space Saving 8-Pin MiniDIP or S8 Package 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, stepdown, 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 110µA, making the LT1108 ideal for power conscious batteryoperated 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 lockout circuit, or error amplifier.
APPLICATI s s s s s s s s S Palmtop Computers 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 Cellular Telephones Portable Instruments TYPICAL APPLICATI Palmtop Computer Logic Supply L1* 100µH 47Ω ILIM 2 × AA CELLS VIN SW1 EFFICIENCY (%) 84 1N5817 5V 150mA 82 80 78 76 74 72 70 VIN = 3V VIN = 2.
5V VIN = 2V + 100µF + LT1108-5 SENSE GND SW2 AVX TPS 330µF 6.
3V *L1 = GOWANDA GA20-103K COILTRONICS CTX100-4 SUMIDA CD105-101K LT1108 • TA01 U Efficiency 1 10 100 LOAD CURRENT (mA) LT1108 • TA02 UO UO 1 LT1108 ABSOLUTE AXI U RATI GS Maximum Power Dissipation .
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500mW Maximum ...


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