Linear Technology’s new LTC4359 is a high-voltage ideal diode controller that offers a simple low-loss replacement to Schottky diodes, along with key features targeted for automotive, avionics as well as solar applications.
The IC operates over a wide 4 V to 80 V supply range and withstands input voltages between -40 V to 100 V without damage. Operating current is a low 150 μA, and a low-current shutdown mode draws just 13 μA. In addition, the device is guaranteed for operation across the -40°C to 125°C ambient temperature range. These features enable it to protect loads in harsh automotive environments.
The LTC4359 controls an external N-channel MOSFET to perform the function of a low-forward-voltage diode. This provides a lower loss path compared to Schottky diodes and in high-power applications provides a more efficient solution and preserves board space by reducing the need for heatsinking.
In addition, control of back-to-back MOSFETs is available to prevent current flowing from input to output during shutdown. The IC controls the forward voltage drop across the MOSFET to ensure smooth current delivery without oscillation, even under light loads. If a power source fails or is shorted, a fast (<1 μs) turn-off minimises reverse current transients.
The LTC4359 can also be used in applications where multiple power supplies are paralleled to provide redundancy. Additionally, it can be used with a reservoir capacitance to hold up the supply for a period of time after a loss of input power. This enables continuing system operation without resetting or rebooting due to brief interruptions of input power.
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