Linear Technology has unveiled the LT4320, an ideal diode bridge controller for 9 V to 72 V systems that replaces each of the four diodes in a full-wave bridge rectifier with a low-loss N-channel MOSFET to reduce power dissipation and increase available voltage.
Power supply can be reduced with this device as the enhanced power efficiency eliminates bulky heatsinks, while low-voltage applications benefit from the extra margin afforded by saving the two diode drops inherent in diode bridges. The controller operates from DC to 600 Hz.
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 flexibility in power levels ranging from one to thousands of Watts.
The chip is available in two options: the LT4320 is designed for DC to 60 Hz voltage rectification, whereas the LT4320-1 rectifies DC to 600 Hz. They are supplied in 8-pin, 3 x 3 mm DFN and 12-lead MSOP packages
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