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Supply Protection Controller Guards Against Overvoltage, Undervoltage & Reverse Polarity Faults

13th September 2010

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Datasheet

Linear Technology introduced the LTC4365, an overvoltage (OV), undervoltage (UV) and reverse protection controller, with a -40V to 60V protection range, for applications that require windowed supply protection. The LTC4365 provides two comparator inputs to configure the OV and UV set points within the normal operating range of 2.5V to 34V using an external resistive divider. A gate pin controls a dual N-channel MOSFET to ensure only voltages within the OV and UV window are passed to the output.

Reverse supply protection circuits automatically isolate the load from negative input voltages. In addition to providing transient protection to 60V, the LTC4365 also blocks 50Hz and 60Hz AC power. No TVS or input capacitor is required for most applications, providing a low component count solution for compact designs. The LTC4365 is targeted for portable instrumentation, industrial automation and automotive applications where accurate overvoltage, undervoltage and reverse protection is required to protect loads from faulty supply connections.

The LTC4365 consumes only 125uA in normal operation, and has a shutdown pin for enabling and disabling the external MOSFETs, and for providing a low current shutdown state of 10uA. A fault output indicates gate status. Using the shutdown pin, two LTC4365's can be configured in a novel application to select between two power supplies. If reverse protection is not needed, only a single external MOSFET is required.

Specified over the full commercial, industrial and automotive temperature ranges, the LTC4365 is offered in 8-pin (3mm x 2mm) DFN and TSOT-23 packages.