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LT1107

Linear Technology
Part Number LT1107
Manufacturer Linear Technology
Description Micropower DC/DC Converter Adjustable and Fixed 5V/ 12V
Published Mar 22, 2005
Detailed Description LT1107 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V FEATURES s s s s s s s s s DESCRIPTIO Operates at Suppl...
Datasheet PDF File LT1107 PDF File

LT1107
LT1107

Overview
LT1107 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 320µA Supply Current Works in Step-Up or Step-Down Mode Only Three 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 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, stepdown, 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 320µA, making the LT1107 ideal for power-conscious batteryoperated 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.
APPLICATI s s s s s s s s S Palmtop Computers 3V to 5V, 5V to 12V Converters 24V 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* 33µH 47Ω ILIM 2 × AA ALKALINE CELLS VIN SW1 47µF LT1107-5 SENSE GND SW2 EFFICIENCY (%) MBRS120T3 5V 150mA 82 80 78 76 74 72 70 68 66 VIN = 2V VIN = 2.
5V VIN = 3V + + 100µF * SUMIDA CD54-330K COILCRAFT DT3316-473 64 1107 TA01 U Efficiency 1 10 100 LOAD CURRENT (mA) 400 1107 TA02 UO UO 1 LT1107 ABSOLUTE AXI U RATI GS Ma...


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