LT4320/LT4320-1

1

4320fb

For more information www.linear.com/LT4320

Features

Description

Ideal Diode Bridge

Controller

The LT®4320/LT4320-1 are ideal diode bridge controllers

that drive four N-channel MOSFETs, supporting voltage

rectification from DC to 600Hz typical. By maximizing

available voltage and reducing power dissipation (see

thermograph comparison below), the ideal diode bridge

simplifies power supply design and reduces power supply

cost, especially in low voltage applications.

An ideal diode bridge also eliminates thermal design

problems, costly heat sinks, and greatly reduces PC board

area. The LT4320’s internal charge pump supports an all-

NMOS design, which eliminates larger and more costly

PMOS switches. If the power source fails or is shorted, a

fast turn-off minimizes reverse current transients.

The LT4320 is designed for DC to 60Hz typical voltage

rectification, while the LT4320-1 is designed for DC to

600Hz typical voltage rectification. Higher frequencies of

operation are possible depending on MOSFET size and

operating load current.

applications

n

Maximizes Power Efficiency

n

Eliminates Thermal Design Problems

n

DC to 600Hz

n

9V to 72V Operating Voltage Range

n

n

Maximizes Available Voltage

n

Available in 8-Lead (3mm

× 3mm) DFN, 12-Lead

MSOP and 8-Lead PDIP Packages

n

Security Cameras

n

Terrestrial or Airborne Power Distribution Systems

n

Power-over-Ethernet Powered Device with a

Secondary Input

n

Polarity-Agnostic Power Input

n

Diode Bridge Replacement

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Patent pending.

+

–

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TG1

IN1

LT4320

BG2

IN2

BG1

TG2

OUTN

OUTP

4320 TA01a

OUTPUT

9V TO 72V

INPUT

DC TO 600Hz (TYP)

Thermograph of Passive Diode Bridge

Thermograph of LT4320

Driving Four MOSFETs

SBM1040 (

×4)

4320 TA01b

typical application

Temperature Rise

CURRENT

MOSFET

2.5mΩ

DIODE

SBM

1040

2A

0.6°C

15°C

4A

3.5°C

32°C

6A

6.7°C

49°C

8A

11°C

66°C

10A

16°C

84°C

DC Input, On Same PCB

LT4320+2.5m FET (

×4)

4320 TA01c