LTC1646

U U FEATURES ■ Allows Safe Board Insertion and Removal from a Live, CompactPCITM Bus ■ Controls 3.3V and/or 5V Supplies ■ Programmable Foldback Current Limit During Power-Up ■ Dual Level Circuit Breakers Protect Supplies from Overcurrent and Short-Circuit Faults ■ LOCAL_PCI_RST# Logic On-Chip ■ PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction ■ User Programmable Supply Voltage Power-Up Rate ■ 15V High Side Drive for External N-Channel MOSFETS ■ PWRGD, RESETOUT and FAULT Outputs U APPLICATIO S ■ CompactPCI Bus Removable Boards , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. LTC1646 CompactPCI Dual Hot Swap Controller DESCRIPTIO The LTC®1646 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a live CompactPCI bus slot. Two external N-Channel transistors control the 3.3V and 5V supplies. The supplies can be ramped-up in current limit or a programmable rate. Electronic circuit breakers protect both supplies against overcurrent fault conditions. The PWRGD output indicates when all of the supply voltages are within tolerance. The OFF/ON pin is used to cycle the board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extraction. PCI_RST# is logically combined on-chip with HEALTHY# in order to generate LOCAL_PCI...