LTC4354
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LTC4354

Negative Voltage Diode-OR Controller and Monitor

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Info: : PRODUCTION tooltip
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Part Details
Part Models 8
1ku List Price Starting From $2.60
Features
  • 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
Additional Details
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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
Part Models 8
1ku List Price Starting From $2.60

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Oct 12, 2022

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LTC4354CS8#PBF

PRODUCTION

LTC4354CS8#TRPBF

PRODUCTION

LTC4354IS8#PBF

PRODUCTION

LTC4354IS8#TRPBF

PRODUCTION

Jun 16, 2021

- 21_0026

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LTC4354CS8#PBF

PRODUCTION

LTC4354CS8#TRPBF

PRODUCTION

LTC4354IS8#PBF

PRODUCTION

LTC4354IS8#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 12, 2022

- 22_0255

arrow down

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LTC4354CS8#PBF

PRODUCTION

LTC4354CS8#TRPBF

PRODUCTION

LTC4354IS8#PBF

PRODUCTION

LTC4354IS8#TRPBF

PRODUCTION

Jun 16, 2021

- 21_0026

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LTC4354CS8#PBF

PRODUCTION

LTC4354CS8#TRPBF

PRODUCTION

LTC4354IS8#PBF

PRODUCTION

LTC4354IS8#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

Tools & Simulations

Tools & Simulations 1

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.

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