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LTC4372HDD

Low Quiescent Current Ideal Diode Controller

Analog Devices 

LTC4372/LTC4373

Low Quiescent Current Ideal Diode Controller

FEATURES

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

APPLICATIONS

n Automotive Battery Protection

n Redundant Power Supplies

n Portable Instrumentation

n Solar Powered Systems

n Energy Harvesting Applications

n Supply Holdup

DESCRIPTION

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.

All registered trademarks and trademarks are the property of their respective owners.

TYPICAL APPLICATION

12V, 20A Reverse Battery Protection

VIN = 12V

BSC026N08NS5

IN SOURCE GATE

2UPU

LTC4372

GND

SHDN

OUT

INTVCC

43723 TA01a

100nF

VOUT

12V

20A

10μF

Power Dissipation vs Load Current

10

8

SCHOTTKY DIODE (SBG2040CT)

6

4

POWER

SAVED

2

MOSFET (BSC026N08NS5)

0

0

5

10

15

20

CURRENT (A)

43723 TA01b

Rev. 0

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