Linear Technology LTC4365 protection controller

Click2Contact

Linear Technology has introduced the LTC4365, an overvoltage, undervoltage and reverse protection controller, with a -40 to 60 V range, for applications that require windowed supply protection.

The device provides two comparator inputs to configure the OV and UV set points within the normal operating range of 2.5 to 34 V 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 60 V, the controller also blocks 50 and 60 Hz AC power. No TVS or input capacitor is required for most applications, providing a low component count for compact designs.

The device is targeted at portable instrumentation, industrial automation and motor vehicle applications where accurate overvoltage, undervoltage and reverse protection is required to protect loads from faulty supply connections.

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