LTC4359

1

Rev D

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Ideal Diode Controller with

Reverse Input Protection

TheLTC®4359isapositivehighvoltageidealdiodecontrol-

ler that drives an external N-channel MOSFET to replace

a Schottky diode. It controls the forward-voltage drop

across the MOSFET to ensure smooth current delivery

without oscillation even at light loads. If a power source

fails or is shorted, a fast turn-off minimizes reverse cur-

rent transients. A shutdown mode is available to reduce

the quiescent current to 9μA for load switch and 14µA for

ideal diode applications.

Whenusedinhighcurrentdiodeapplications,theLTC4359

reducespowerconsumption,heatdissipation,voltageloss

and PC board area. With its wide operating voltage range,

the ability to withstand reverse input voltage, and high

temperature rating, the LTC4359 satisfies the demanding

requirementsofbothautomotiveandtelecomapplications.

The LTC4359 also easily ORs power sources in systems

with redundant supplies.

12V, 20A Automotive Reverse-Battery Protection

Power Dissipation vs Load Current

APPLICATIONS

n

Reduces Power Dissipation by Replacing a Power

Schottky Diode

n

Wide Operating Voltage Range: 4V to 80V

n

Reverse Input Protection to – 40V

n

Low 9µA Shutdown Current

n

Low 150μA Operating Current

n

Smooth Switchover without Oscillation

n

Controls Single or Back-to-Back N-Channel MOSFETs

n

Available in 6-Pin (2mm × 3mm) DFN, 8-Lead MSOP

and 8-Lead SO Packages

n

Automotive Battery Protection

n

Redundant Power Supplies

n

Supply Holdup

n

Telecom Infrastructure

n

Computer Systems/Servers

n

Solar Systems

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4359 TA01

LTC4359

SHDN

IN

SOURCE

OUT

47nF

1k

GATE

BSC028N06NS

SMAT70A

70V

SMAJ24A

24V

12V

CURRENT (A)

0

4

8

6

20

4359 TA01a

2

0

5

10

15

10

SCHOTTKY DIODE (SBG2040CT)

POWER

SAVED

MOSFET (BSC028N06NS)