Alternative Parts

  • LTC4352
    LTC4352

    Low Voltage Ideal Diode Controller with Monitoring

  • LTC4370
    LTC4370

    Two-Supply Diode-OR Current Balancing Controller

Overview

Features and Benefits

  • Low Loss Replacement for Power Diodes
  • Controls N-Channel MOSFETs
  • 0V to 18V Supply ORing or Holdup
  • 1μs Gate Turn-On and Turn-Off Time
  • Enable Inputs
  • MOSFET On-Status Outputs
  • 16-Lead MSOP and DFN (4mm × 3mm) Packages

Product Details

The LTC4353 controls external N-channel MOSFETs to implement an ideal diode function. It replaces two high power Schottky diodes and their associated heat sinks, saving power and board area. The ideal diode function permits low loss power supply ORing and supply holdup applications.

The LTC4353 regulates the forward-voltage drop across the MOSFET to ensure smooth current transfer in diode-OR applications. A fast turn-on reduces the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.

The controller operates with supplies from 2.9V to 18V. If both supplies are below 2.9V, an external supply is needed at the VCC pin. Enable inputs can be used to turn off the MOSFET and put the controller in a low current state. Status outputs indicate whether the MOSFETs are on or off.

Applications

  • Redundant Power Supplies
  • Supply Holdup
  • High Availability Systems and Servers
  • Telecom and Network Infrastructure

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.

Evaluation Kits (1)

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.

LTspice

Models for the following parts are available in LTspice:

LTC4353

Product Recommendations

LTC4353 Companion Parts

Recommended Related Parts

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

LTC4353 Discussions

RE: LTC4353 secondary input voltage drop
11 week(s) ago in Power By Linear
RE: LTC4353 secondary input voltage drop
17 week(s) ago in Power By Linear
RE: LTC4353 secondary input voltage drop
17 week(s) ago in Power By Linear
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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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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.