LTC4372/LTC4373

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Low Quiescent Current Ideal Diode Controller

The LTC®4372/LTC4373 are positive high voltage ideal

diode controllers that drive an external N-channel

MOSFET to replace a Schottky diode. They control the

forward voltage drop across the MOSFET to ensure cur-

rent delivery or current transfer from one path to the other

even at light loads.

A 5µA operating current achieves high efficiency for inter-

mittent load applications or always-on backup power sup-

plies. If a power source fails or is shorted, a fast turn-

off minimizes reverse current transients. The LTC4372/

LTC4373 control back-to-back N-channel MOSFETs for

inrush current control and load switching.

The LTC4372 shutdown function reduces the quiescent

current to 0.5µA. The LTC4373 has a UV pin for undervolt-

age monitoring while the UVOUT pin provides hysteresis

adjustment and status information. During undervoltage,

the back-to-back MOSFETs are cut off and quiescent cur-

rent reduces to 0.5μA.

12V, 20A Reverse Battery Protection

Power Dissipation vs Load Current

APPLICATIONS

n

Reduces Power Dissipation by Replacing a Power

Schottky Diode

n

Low Quiescent Current: 5µA Operating, 0.5µA

Shutdown

n

Wide Operating Voltage Range: 2.5V to 80V

n

Reverse Supply Protection to –28V

n

High Side External N-Channel MOSFET Drive

n

Drives Back-to-Back MOSFETs for Inrush Control and

Load Switching

n

Fast Reverse Current Turn-Off within 1.5µs

n

8-Lead MSOP and 3mm × 3mm DFN Packages

n

Automotive Battery Protection

n

Redundant Power Supplies

n

Portable Instrumentation

n

Solar Powered Systems

n

Energy Harvesting Applications

n

Supply Holdup

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CURRENT (A)

0

4

8

6

20

43723 TA01b

2

0

5

10

15

10

SCHOTTKY DIODE (SBG2040CT)

POWER

SAVED

MOSFET (BSC026N08NS5)

LTC4372

SHDN

GND

OUT

GATE

= 12V

SOURCE

IN

2UPU

43723 TA01a

12V

20A

BSC026N08NS5

10F

100nF