Reference Design Library > Power Management > OR-ing Controllers > DC1926A: Dual Ideal Bridge Controller

DC1926A: Dual Ideal Bridge Controller

Summary

Demonstration circuit 1926A features the LTC4353, a dual low voltage ideal diode controller, in a typical 12A application. The LTC4353 creates two near-ideal diodes using external N-channel MOSFETs thereby replacing high power Schottky diodes and their associated heat sinks. Ideal diodes enable low loss power ORing and supply holdup applications.

The LTC®4353 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.

Specifications

Manufacturer Analog Devices Inc.
Category Power Management
Sub-Category OR-ing Controllers
Eval Board Part Number DC1926A-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Current Out 12 A
Voltage Out 18 V
Supply Voltage 2.9 ~ 18 V
Features Shutdown, Enable, Standby
Status Indication
Quiescent Current [Typical] 88 µA
Component Count + Extras 12 + 17
Application / Target Market Power: Auxiliary Power Supply
Servers
Telecom
Design Author Linear Technology
Quiescent Current [Maximum] 190 µA
Main I.C. Base Part LTC4353
Date Created By Author 2011-12
Date Added To Library 2013-12

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Support Documents & Media

DC1926A - User Guide LTC4353 - Datasheet

Media

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