Ideal Diode Bridge Controller

Features
- Maximizes Power Efficiency
- Eliminates Thermal Design Problems
- DC to 600Hz
- 9V to 72V Operating Voltage Range
- IQ = 1.5mA (Typical)
- Maximizes Available Voltage
- Available in 8-Lead (3mm × 3mm) DFN, 12-Lead MSOP and 8-Lead PDIP Packages

applications
- Security Cameras
- Terrestrial or Airborne Power Distribution Systems
- Power-over-Ethernet Powered Device with a Secondary Input
- Polarity-Agnostic Power Input
- Diode Bridge Replacement

Description
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.