LTC4211

The LTC^®4211 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages ranging from 2.5V to 16.5V. The LTC4211 provides softstart and inrush current limiting during the start-up period which has a programmable duration.

Two on-chip current limit comparators of LTC4211 provide dual level overcurrent circuit breaker protection. The slow comparator trips at V_CC 50mV and activates in 20ms (or programmed by an external filter capacitor, MS only). The fast comparator trips at V_CC 150mV and typically responds in 300ns.

The FB pin of LTC4211 monitors the output supply voltage and signals the RESET output pin. The ON pin signal turns the chip on and off and can also be used for the reset function. The MS package has FAULT and FILTER pins to provide additional functions like fault indication, autoretry or latch-off modes, programmable current limit response time and programmable overvoltage protection using an external Zener diode clamp.