LT1108

PRODUCTION

Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

Data Sheet Product Selection Table
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Overview

  • 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, 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 outputcurrent 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 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, under voltage lock-out circuit, or error amplifier.

Applications

  • 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
LT1108
Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
Palmtop Computer Logic Supply Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 2

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1108
  • LT1108-12
  • LT1108-5
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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