LTC4221IGN#PBF

LTC4221 is a 2-channel Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. Using two independent high side gate drivers to control two external N-channel pass transistors, the output voltages can be ramped up with current foldback to limit the inrush current during the start-up period. Each channel has two current limit comparators that provide dual level and dual speed overcurrent circuit breaker protection after the start-up period. If any current sense voltage exceeds 100mV for 1μs or 25mV for the timeout delay (set by the CFILTER at the FILTER pin), then the FAULT latch is set and both GATE pins are pulled low. The FB pins monitor the respective channel output voltages and provide the inputs for the PWRGD comparators as well as overvoltage protection. It is used in application such as electronic circuit breaker, power supply sequencing, live board insertion and removal, industrial high side switch/circuit breaker etc.

• Configurable power supply sequencing
• Soft-start with current foldback limits inrush current
• No external gate capacitor required
• Adjustable dual level circuit breaker protection
• Controls supply voltages from 1V to 13.5V
• Independent N-channel MOSFET high side drivers
• FB pin monitors VOUT for overvoltage protection
• Latch off or automatic retry on current fault
• FAULT and PWRGD outputs
• Operating temperature is -40°C to 85°C, package style is 16-lead plastic SSOP

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