Transcription of Reverse Current/Battery Protection Circuits - TI.com
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Reverse Current/Battery Protection Circuits - TI.com
Application ReportSLVA139 - June 20031 Reverse Current/Battery Protection CircuitsJeff FalinPMP Portable PowerABSTRACTU sers of battery powered equipment expect safeguards to prevent damage to the internalelectronics in the event of Reverse battery installation, accidental short circuiting, or otherinappropriate operation. These safeguards can be either mechanical or electronic. Anexample of a mechanical safeguard is requiring the use of special connectors andinstructional pictures and symbols. For example, a 9-V battery has different terminals, andits rechargeable battery packs are physically designed for one direction of insertion. Otherbattery types, like single-cell alkaline, are not so easily protected by mechanical , battery powered equipment designers and manufacturers must ensure that anyreverse current flow and Reverse bias voltage is low enough to prevent damage to either thebattery itself or the equipment s internal electronics.
SLVA139 2 Reverse Current/Battery Protection Circuits Using a FET The most recent MOSFETs are very low on resistances, and therefore, are ideal for providing
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