Reverse battery protection device containing power MOSFET

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means

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361 58, 307127, H02H 900

Patent

active

055173799

ABSTRACT:
A device for protecting battery-powered semiconductor devices and the like against a reverse battery condition. During normal operation a charge pump charges the gate of a power MOSFET, turning the MOSFET on and providing a low-resistance power supply path from the battery to the load. If the battery is reversed, a depletion mode device shorts the gate and source of the MOSFET, turning it off and disconnecting the load from the battery.

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