LTC4354

PRODUCTION

Negative Voltage Diode-OR Controller and Monitor

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Overview

  • Controls N-Channel MOSFETs
  • Replaces Power Schottky Diodes
  • Less Than 1µs Turn-off Time Limits Peak Fault Current
  • 80V Operation
  • Smooth Switchover Without Oscillation
  • No Reverse DC Current
  • Fault Output
  • Selectable Fault Thresholds
  • Available in 8-Pin (3mm × 2mm) DFN and 8-Pin SO Packages

The LTC4354 is a negative voltage diode-OR controller that drives two external N-channel MOSFETs. It replaces two Schottky diodes and the associated heatsink, saving power and area. The power dissipation is greatly reduced by using N-channel MOSFETs as the pass transistors. Power sources can easily be ORed together to increase total system power and reliability.

When first powered up, the MOSFET body diode conducts the load current until the pass transistor is turned on. The LTC4354 servos the voltage drop across the pass transistors to ensure smooth transfer of current from one transistor to the other without oscillation.

The MOSFETs are turned off in less than 1µs whenever the corresponding power source fails or is shorted. Fast turnoff prevents the reverse current from reaching a level that could damage the pass transistors.

A fault detection circuit with an open drain output capable of driving an LED or opto-coupler indicates either MOSFET short, MOSFET open or supply failed.

Applications

  • AdvancedTCA Systems
  • –48V Distributed Power Systems
  • Computer Systems/Servers
  • Telecom Infrastructure
  • Optical Networks

LTC4354
Negative Voltage Diode-OR Controller and Monitor
–48V Diode-OR Power Dissipation vs Load Current Product Package 1 Product Package 2
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Documentation

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 1
LTC4371 RECOMMENDED FOR NEW DESIGNS Dual Negative Voltage Ideal Diode-OR Controller and Monitor
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Tools & Simulations

LTspice


Models for the following parts are available in LTspice:

  • LTC4354
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.


Evaluation Kits

eval board
DC852A

LTC4354 Negative Voltage Diode-OR Controller and Monitor

Product Details

DC852A: Demo Board for the LTC4354 Negative Voltage Diode-OR Controller and Monitor.

DC852A
LTC4354 Negative Voltage Diode-OR Controller and Monitor
DC852A - Schematic

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