LTC4451

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

40V, 7A Ideal Diode

The LTC®4451 is a high-performance Schottky diode

replacement using an integrated N-Channel power

MOSFET. It easily ORs power supplies together to increase

system reliability and prevent reverse conduction.

The LTC4451 regulates the forward voltage at 15mV

to minimize power loss compared to Schottky diodes.

Regulation ensures smooth current transfer without oscil-

lation in diode-OR applications. When the power MOSFET

and rated for forward conduction up to 7A while dissi-

pating 1.34W. A high performance gate driver with fast

transient response minimizes both forward power dis-

work down to ground for low voltage applications. The

LTC4451 is available in a small 16-Lead 2mm × 3mm

LQFN Package.

Power Dissipation vs Load Current

APPLICATIONS

n

Reduces Power Dissipation by Replacing a Power

Schottky Diode with No External Components

n

Internal 7A, 21mΩ N-Channel MOSFET

n

15mV Regulated Forward Voltage

n

20µA Operating Current, 0.8µA Shutdown

n

n

Fast Turn-On Minimizes Voltage Droop

n

Fast Reverse Recovery Time Minimizes Reverse

Transient Current

n

Smooth Switchover in Diode-OR Applications

n

16-Lead 2mm × 3mm LQFN Package

n

Schottky Diode Replacement

n

Industrial, Medical and Consumer Portable Devices

n

Battery and Wall Adapter Diode ORing

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LTC4451

GND

OUT

IN

24V, 7A

SHDN#

0.1µF

24V

4451 TA01

STATUS

STATUS

OUTPUT

POWER

SAVED

B540 SCHOTTKY

LTC4451

LOAD CURRENT (A)

0

2

4

6

8

10

0

1

2

3

4

5

6

4451 TA01b