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PowerPath controllers drive large PFETs

Posted: 20 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET? power management? controller? Linear Technology? PowerPath?

Linear Technology Corp. has introduced dual-diode PowerPath controllers for driving small and large gate capacitance p-channel MOSFETs in power switchover circuits. The control circuitry of LTC4416 and LTC4416-1 allows two power supplies to operate in tandem, ensuring highly efficient ORing of these power sources.

The 25mV forward voltage of the new devices' controlled PFET is lower than a Schottky diode's, thereby extending battery life while reducing power loss and heat. Applications include systems that typically take power from multiple input sources, such as high current power path switches, UPS, battery backup systems, emergency systems with battery backups, logic-controlled power switches and automotive and industrial systems.

The LTC4416 is designed to work with slow moving input supplies and provides a "soft-off" feature to minimize droop when the supply voltages are changing. The LTC4416-1 is optimized for rapidly moving input supplies that must be quickly turned off. This feature is useful when protecting the load from a large input transient or preventing loading of the power supply when it is deemed undesirable by the user.

The LTC4416 and LTC4416-1 are guaranteed to meet performance specifications over a wide range of operating conditions including an ambient temperature range of -40C to 125C and a voltage range of 3.6-36V.

The LTC4416 and LTC4416-1 feature ultralow 70?A quiescent current (35?A per channel), independent of the load current. In addition, the ICs use a strong gate drive for fast gate turn-on and turn-off times of 60?s and 30?s, respectively. The devices also provide reverse battery discharge protection and MOSFET gate protection clamp circuitry.

The LTC4416EMS/-1 and LTC4416IMS/-1 are available from stock in a 10-lead MSOP package. Pricing starts at $2.45 and $2.95 each, respectively, for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC4416 36V, Low Loss Dual PowerPath Controllers for Large PFETs ICs, Interface



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