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Power-supply ICs and controllers

Linear Technology launches H- and MP-grade LT4320 for military and automotive use

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By Linear Technology now part of Analog Devices on 11th March 201415th December 2015

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Download document:

LT4320 data sheet - .PDF file.

Linear Technology has introduced the automotive (H-grade) and high-reliability military (MP-grade) versions of the LT4320, which is a suitable diode bridge controller for 9–72V systems.

The LT4320 replaces a full-wave diode bridge rectifier with a low-loss N-channel MOSFET bridge to reduce the power and voltage losses by a factor of 10 or more. Power supply size is reduced as the enhanced power efficiency eliminates bulky heatsinks.

Low-voltage applications benefit from the extra margin afforded by saving the two diode drops inherent in diode bridges, while compared with the traditional alternative the MOSFET bridge enables a rectifier design that is space and power efficient.

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 LT4320 is available in two options: the LT4320 is designed for DC to 60Hz voltage rectification, whereas the LT4320-1 is optimised for DC to 600Hz by doubling the topside source-drain regulation voltage.

Click on the link above to download the data sheet.

Key features and specifications

Low loss replacement for diode bridge rectifier
Ability to minimise heat to ease thermal design
Ability to maximise power efficiency and available voltage
9–72V, DC to 600Hz operation
Control of four N-channel MOSFETs
1.5mA quiescent current
-40°C to +125°C guaranteed junction temperature range (H grade)
-55°C to +125°C guaranteed junction temperature range (MP grade)
Eight-pin DFN (3 x 3mm), eight-lead PDIP and 12-lead MSOP packages

External link:

More information

Linear Technology now part of Analog Devices

Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges.

Contact Supplier Visit our website 01628 477066

About Analog Devices
Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges. We enable our customers to interpret the world around us by intelligently bridging the physical and digital with unmatched technologies that sense, measure, power, connect and interpret. Visit http://www.analog.com

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