DESCRIPTION
The internal PMOS power switches use slew limiting when turned on and off to control power switching to capacitive loads, and to manage the switching off of inductive loads. A power switch automatically opens the circuit in the event of an overload condition. The overload condition is a function of fault current over time; more severe fault conditions cause the switch to open faster. Each power switch has an individual differential ON/OFF control input pair which directly interfaces to singleended logic or an RS-422 type bus. Power switches default to the ON state with open-circuit control inputs. A tripped power switch enters hiccup mode, that allows a die cool-down period for 10s with the load disconnected before retrying. Up to 4,096 cool-down/retry cycles are attempted before the power switch latches OFF. Each channel includes complementary Power Good and In Reset logic status outputs for telemetry purposes. Power Good is asserted when the device is supplying nominal power to the load.
Microchip Technology
