Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

Obsolete

For New Designs

LTC1148 - High Efficiency Synchronous Step-Down Switching Regulators

LT1432 - 5V High Efficiency Step-Down Switching Regulator Controller

Features

  • OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
  • Accurate Preset +5V Output
  • Up to 90% Efficiency
  • Optional Burst Mode for Light Loads
  • Can be Used with Many LTC Switching ICs
  • Accurate Ultra-Low-Loss Current Limit
  • Operates with Inputs from 6V to 30V
  • Shutdown Mode Draws Only 15µA
  • Uses Small 50µH Inductor

Typical Application

LT1432 Typical Application
LT1432 Typical Application

Description

OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.

The LT1432 is a control chip designed to operate with the LT1170/LT1270 family of switching regulators to make a very high efficiency 5V step-down (buck) switching regulator. A minimum of external components is needed.

Included is an accurate current limit which uses only 60mV sense voltage and uses "free" PC board trace material for the sense resistor. Logic controlled electronic shutdown mode draws only 15µA battery current. The switching regulator operates down to 6V input.

The LT1432 has a logic controlled "burst" mode to achieve high efficiency at very light load currents (0 to 100mA) such as memory keep-alive. In normal switching mode, the standby power loss is about 60mW, limiting efficiency at light loads. In burst mode, standby loss is reduced to approximately 15mW. Output current in this mode is typically in the 5mA to 100mA range.

The LT1432 is available in 8-pin surface mount and DIP packages. The LT1170/LT1270 family will also be available in a surface mount version of the 5-pin TO-220 package. For 3.3V versions contact Linear Technology Corporation.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

LT1432 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Laptop and Palmtop Computers
  • Portable Data-Gathering Instruments
  • DC Bus Distribution Systems
  • Battery-Powered Digital Widgets

People Who Viewed This Product Also Viewed

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT1432
LT1432-3.3

Technical Support