LTC4352

1

4352f

TYPICAL APPLICATION

DESCRIPTION

Low Voltage Ideal Diode

Controller with Monitoring

N-channel MOSFET. It replaces a high power Schottky

diode and the associated heat sink, saving power and

board area. The ideal diode function permits low loss

power ORing and supply holdup applications.

The LTC4352 regulates the forward voltage drop across

the MOSFET to ensure smooth current transfer in diode-OR

applications. A fast turn-on reduces the load voltage droop

during supply switch-over. If the input supply fails or is

shorted, a fast turn-off minimizes reverse currents.

The controller operates with supplies from 2.9V to 18V.

For lower voltages, an external supply is needed at the

or overvoltage conditions. The controller also features an

open MOSFET detect circuit that flags excessive voltage

drop across the pass transistor in the on state. A REV pin

enables reverse current, overriding the diode behavior

when desired.

2.9V to 18V Ideal Diode

FEATURES

APPLICATIONS

UV

OV

REV

LTC4352

STATUS

FAULT

MOSFET ON

STATUS

0.1μF*

TO LOAD

2.9V TO 18V

Si7336ADP

*OPTIONAL

FAULT

0.1μF

4352 TA01

CPO

SOURCE

GATE

GND

OUT

Power Dissipation vs Load Current

LOAD CURRENT (A)

0

0

2.5

2.0

1.5

1.0

0.5

4.0

3.0

3.5

2

46

8

4352 TA01b

10

DIODE (SBG1025L)

MOSFET (Si7336ADP)

POWER

SAVED

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

All other trademarks are the property of their respective owners.