LTC1643H

LTC1643L/LTC1643L-1/LTC1643H PCI-Bus Hot Swap Controller FEATURES s s DESCRIPTIO s s s s s s Allows Safe Board Insertion and Removal from a Live PCI Slot Works on either a Motherboard (LTC1643H) or CompactPCITM Card (LTC1643L/LTC1643L-1) Controls –12V, 3.3V, 5V, 12V Supplies Programmable Foldback Current Limit with Circuit Breaker User-Programmable Supply Voltage Power-Up Rate High Side Drive for External N-Channels –12V and 12V On-Chip Switches Fault and Power-Good Outputs U APPLICATIO S s s PCI-Based Servers CompactPCI Compliant Boards , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. CompactPCI is a trademark of PCI Industrial Computer Manufacturing Group. The LTC®1643 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a live PCI-Bus slot. Two external N-channel transistors control the 3.3V and 5V supplies while on-chip switches control the –12V and 12V supplies. All supply voltages can be ramped up at a programmable rate. An electronic circuit breaker protects all four supplies against overcurrent faults. The foldback current limit feature limits current spikes and power dissipation when shorts occur and allows boards with large capacitances to be powered up without tripping the circuit breaker. The PWRGD output indicates when all of the supply voltages are within tolerance and the FAULT output indicates an overcurrent condition. The ON(LTC1643H)/ON...