The LTC4213 is an electronic circuit breaker that eliminates the sense resistor by using the RDS(ON) of the external MOSFET. It features two circuit breaking responses to varying overload conditions with three selectable trip thresholds and a high side drive for an external N-channel MOSFET switch.
The document introduces the LTC4213, an electronic circuit breaker that eliminates the need for a sense resistor by utilizing the Rds(on) of an external MOSFET. This approach offers low insertion loss advantages at low operating load voltages. The device features two internal comparators (SLOWCOMP and FASTCOMP) to handle varying overload conditions with selectable trip thresholds.
It uses the Rds(on) of the external MOSFET to monitor load current via SENSEP and SENSEN pins.
An overload current exceeding Vop/Rgion causes SLOWCOMP to trip the circuit breaker after a 16s delay.
When Vseygep exceeds Voc + 0.7V for 65us, an internal OVP circuit activates and pulls the GATE pin low.