Overview

Features and Benefits

  • Operates at Supply Voltages From 2.0V to 30V
  • Consumes Only 110µA 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 SO8 Package

Product Details

The LT1173 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 2.0V to 12V in step-up mode and to 30V in step-down mode. The LT1173 functions equally well in step-up, step-down or inverting applications.

The LT1173 consumes just 110µA supply current at standby, making it ideal for applications where low quiescent current is important. The device can deliver 5V at 80mA 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 gain block can be configured as a low battery detector, linear post regulator, under voltage lock-out circuit or error amplifier.

For input sources of less than 2V, use the LT1073.

Applications

  • Flash Memory Vpp Generators
  • 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
  • Laptop and Palmtop Computers
  • Cellular Telephones
  • Portable Instruments

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

LTspice

Models for the following parts are available in LTspice:

LT1173
LT1173-12
LT1173-5

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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