MILPITAS, CA – June 10, 2013 – Linear Technology Corporation introduces the LT4320, an
ideal diode bridge controller for 9V to 72V systems that replaces each of the four diodes in a
full-wave bridge rectifier with a low loss N-channel MOSFET to significantly reduce the power
dissipation and increase available voltage. Power supply size is reduced as the enhanced power
efficiency eliminates bulky heat sinks. Low voltage applications benefit from the extra margin
afforded by saving the two diode drops inherent in diode bridges. Compared to the traditional
alternative, the MOSFET bridge enables a rectifier design that is highly space- and powerefficient.
The controller operates from DC to 600Hz.

The LT4320 switch control smoothly turns on the appropriate two MOSFETs, while
keeping the other two off to prevent reverse currents. An integrated charge pump provides the
gate drive for the external low on-resistance N-channel MOSFETs without requiring external
capacitors. The choice of MOSFETs offers the greatest flexibility in power levels ranging from
one to thousands of watts.

The LT4320 is available in two options: the LT4320 is designed for DC to 60Hz voltage
rectification, whereas the LT4320-1 rectifies DC to 600Hz. Specified over the −40oC to 85oC
industrial temperature range, the LT4320 is offered in a compact 8-pin 3mm x 3mm DFN
package, and a 12-lead MSOP package with enhanced high-voltage pin spacing. Priced
beginning at $2.95 each for 1,000-piece quantities, the device is available today in production
quantities. Evaluation circuit boards are available online or from your local Linear Technology
sales office. For more information, visit www.linear.com/product/LT4320.

Summary of Features: LT4320

1. Low Loss Replacement for Diode Bridge Rectifier

2. Controls N-Channel MOSFETs

3. Maximizes Power Efficiency

4. Eliminates Thermal Design Problems

5. Maximizes Available Voltage

6. 9V to 72V Operating Voltage Range

7. DC to 600Hz Operation

8. 1.5mA Quiescent Current

9. –40°C to +85°C Guaranteed Temperature Range

10. 8-Pin 3mm x 3mm DFN & 12-Lead MSOP Packages

Source：http://www.linear.com/