ltc4354cs8-trpbf Linear Technology Corporation, ltc4354cs8-trpbf Datasheet

ltc4354cs8-trpbf

Manufacturer Part Number

ltc4354cs8-trpbf

Description

Negative Voltage Diode-or Controller And Monitor

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC4354CS8-TRPBF.pdf (12 pages)

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APPLICATIO S

FEATURES

■

TYPICAL APPLICATIO

–48V_RTN

All other trademarks are the property of their respective owners.

= –48V

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

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

AdvancedTCA

–48V Distributed Power Systems

Computer Systems/Servers

Telecom Infrastructure

Optical Networks

Systems

–48V Diode-OR

IRF3710

LTC4354

12k

IRF3710

FAULT

1µF

LED

33k

4354 TA01

LOAD

DESCRIPTIO

The LTC

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 transis-

tors to ensure smooth transfer of current from one tran-

sistor to the other without oscillation.

The MOSFETs are turned off in less than 1µs whenever the

corresponding power source fails or is shorted. Fast turn-

off 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.

4354 is a negative voltage diode-OR controller

Diode-OR Controller

Power Dissipation vs Load Current

Negative Voltage

DIODE (MBR10100)

CURRENT (A)

and Monitor

FET (IRF3710)

POWER

SAVED

4354 TA01b

LTC4354

4354fb

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