Rugged ideal diode-OR operates from over wide temperature

2 June 2004 Power Electronics / Power Management

The LTC4412HV is a robust 'ideal diode' controller with at least 10x lower forward voltage than a Schottky diode, according to the manufacturer, Linear Technology. As a result, the device provides increased efficiency by an order of magnitude in systems requiring load sharing or automatic switching between DC input power sources.

The LTC4412HV, offered in a 6-lead ThinSOT package, is guaranteed to meet performance specifications from -40 to 125°C while the operating voltage range is rated from 2,5 to 36 V. The IC regulates the gate voltage of an external P-channel MOSFET to maintain a 20 mV forward voltage drop. Compared to a Schottky diode, the company says the device offers the advantages of higher efficiency, less localised heat dissipation and lower dropout voltage. It provides reverse battery, overcurrent and MOSFET protection circuitry in a tiny SOT-23 package. In addition, it offers a digital control input and an open-drain status output pin to simplify interfacing to a microcontroller.

Applications include backup power supplies, multiple-slot battery charger equipment, and multiple-cell Li-Ion battery-powered handheld devices, security systems as well as automotive and industrial systems.

Multiple LTC4412HVs can be connected to allow load sharing with automatic load switchover. The status pin can be used to enable a second P-channel MOSFET power switch so that both Schottky diodes are eliminated from the diode-OR circuit. The IC's ultra low 11 µA quiescent current is independent of the load current. The gate turn-on and turn-off times while driving a 1 nF load from a 12 V input are 110 µs and 13 µs, respectively.

For more information contact Memec SA, 011 897 8600.

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