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2022-09-24 23:30:48
LTC1643L-PCI bus hot-swap controller
Features allow safe insertion and removal from powered PCI slots for motherboards (LTC1643H) or CompactPCITM cards (LTC1643L/LTC1643L-1)
Control - 12V, 3.3V, 5V, 12V Supply Programmable Foldback Current Limit to Circuit Breaker User Programmable Supply Voltage Power-Up Ratio External N-Channel High-Side Driver
- 12V and 12V on-chip switch fault and power good outputs
The LTC®1643 is a popular SwapTM controller that allows boards to be safely inserted and removed from a powered PCI bus slot. Two external N-channel transistors control the supply of 3.3V and 5V on-chip switches, while controlling the -12V and 12V supplies. All supply voltages can be ramped up by a programmable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. The foldback current limit function limits the occurrence of current spikes and power dissipation shorts, and allows the circuit breaker to be energized without tripping the board with large capacitance. The PWRGD output indicates when all supply voltages are within tolerance and the fault output indicates an overcurrent condition. (LTC1643H)/ON (LTC1643L/LTC1643L-1) pins are used to cycle the board's power or reset circuit breaker. The ±12V power good compare of the LTC1643L-1 is disabled.