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

Obsolete

For New Designs

LTC1628 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

LTC1267 - Dual High Efficiency Synchronous Step-Down Switching Regulators

Features

  • OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
  • Dual Outputs: 3.3V and 5V, Adjustable and 5V
  • Wide VIN Range: 4V to 40V
  • Ultra-High Efficiency: Up to 95%
  • Low Supply Current in Shutdown: 20µA
  • Current Mode Operation for Excellent Line and Load Transient Response
  • High Efficiency Maintained Over a Wide Output Current Range
  • Independent Micropower Shutdown
  • Very Low Dropout Operation: 100% Duty Cycle
  • Synchronous FET Switching for High Efficiency
  • Available in Standard 28-Pin SSOP

Typical Application

LTC1267 Typical Application

Description

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

The LTC1267 series are dual synchronous step-down switching regulator controllers featuring automatic Burst Mode (TM) operation to maintain high efficiencies at low output currents. The LTC1267 is composed of two separate regulator blocks, each driving a pair of external complementary power MOSFETs at switching frequencies up to 400kHz. The LTC1267 uses a constant off-time current mode architecture to provide constant ripple current in the inductor and provide excellent line and load transient response.

A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage,providing significant efficiency improvement when operating at high input voltage. The output current level is user-programmable via an external current sense resistor.

The LTC1267 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space.

Packaging

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

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

  • Notebook and Palmtop Computers
  • Battery-Operated Digital Devices
  • Portable Instruments
  • DC Power Distribution Systems

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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:
LTC1267
LTC1267-ADJ
LTC1267-ADJ5

Technical Support