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Linear diode reduces heat, board space

Posted: 10 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? diode? board space? battery? ltc4413?

Linear Technology Corp. unveiled a two-channel ideal diode that promises to reduce heat, voltage drop and board space as well as preserve battery life.

According to the company, the LTC4413 diode is designed 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 device 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.

The LTC4413 contains two 100-milliohm P-channel MOSFETs. Quiescent current is <40?A for output currents up to 1A. If either of the output voltages exceeds their respective input voltages, that MOSFET is turned off and <1?A 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. Additionally, a 9?A 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.

A thermally enhanced 3-by-3mm DFN package permits each channel to deliver up to 2.6A from an input supply ranging from 2.5V to 5.5V. With a low forward voltage of 80mV at 500mA and 210mV at 2A, and 1?A of leakage current, the new diode provides improvement over discrete diode OR solutions, said Linear.

The LTC4413 is rated for operation from -40C to 85C, and is housed in a 10-lead 3-by-3mm DFN package. For 1,000-piece orders, pricing starts at $2.15 each.

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