Ideal diode cuts heat, volt drop and board space

The LTC4413 is a two-channel ideal diode designed to reduce heat, voltage drop and board space as well as preserve battery life.

Linear Technology has introduced the LTC4413, a two-channel ideal diode designed to reduce heat, voltage drop and board space as well as preserve battery life.

The device is ideal for applications requiring an ideal diode OR function for load sharing or automatic switchover between two input power sources.

Equipped with several intelligent circuits, the LTC4413 has control access to each ideal diode - allowing for adjustment of the switchover voltage - and indicates whether the selected ideal diode is conducting.

It also offers current limit and thermal protection as well as slow turn-off to protect against voltage spikes.

A thermally enhanced 3 x 3mm DFN package permits each channel to deliver up to 2.6A from an input supply ranging from 2.5 to 5.5V.

With a low forward voltage of 80mV at 500mA and 210mV at 2A, and only 1uA of leakage current, the LTC4413 provides great improvement over discrete diode OR solutions.

The LTC4413 is designed for use in handheld products, systems with a USB interface or backup battery.

The LTC4413 contains two 100mohm P-channel MOSFETs.

Quiescent current is less than 40uA for output currents up to 1A.

If either of the output voltages exceeds their respective input voltages, that MOSFET is turned off and less than 1uA of reverse current will flow from out to in.

Maximum forward current in each MOSFET is limited to a constant 2.6A and internal thermal limiting circuits protect the part during fault conditions.

A 9uA open-drain STAT pin indicates conduction status of the selected channel and can also be used to drive an external P-channel MOSFET to control a third alternate power source.

The LTC4413 is rated for operation from -40 to +85C and is housed in a 10-lead 3 x 3mm DFN.

1000-piece pricing starts at $2.15 each.

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