LT1111

PRODUCTION

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

Data Sheet Product Selection Table
Viewing:

Overview

  • Operates at Supply Voltages from 2V to 30V
  • Works with Surface Mount Inductors
  • 72kHz Oscillator
  • Only Three External Components Required
  • Step-Up or Step-Down Mode
  • 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 LT1111 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 LT1111 functions equally well in step-up, step-down, or inverting applications.

The LT1111 oscillator is set at 72kHz, optimizing the device to work with off-the-shelf surface mount inductors. The device can deliver 5V at 100mA from a 3V input in step-up mode or 5V at 200mA from a 12V input in step-down mode.

Switch current limit can be programmed with a single resistor. An auxiliary open-collector gain block can be configured as a low-battery detector, linear post regulator, undervoltage lock-out circuit, or error amplifier.

For input sources of less than 2V use the LT1110.

Applications

  • 3V to 5V, 5V to 12V Converters
  • 9V to 5V, 12V to 5V Converters
  • Remote Controls
  • Peripherals and Add-On Cards
  • Battery Backup Supplies
  • Uninterruptible Supplies
  • Laptop and Palmtop Computers
  • Cellular Telephones
  • Portable Instruments
  • Flash Memory VPP Generators
LT1111
Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
All Surface Mount 3V to 5V Step-Up Converter Typical Load Regulation Product Package 1 Product Package 2
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

Application Note 3

Design Note 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT1111
  • LT1111-12
  • LT1111-5
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.

Latest Discussions

No discussions on LT1111 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed