LTC1644

+ U U FEATURES s Allows Safe Board Insertion and Removal from a Live, CompactPCITM Bus s Controls –12V, 3.3V, 5V and 12V Supplies s Adjustable Foldback Current Limit with Circuit Breaker s Dual-Level Circuit Breakers Protect 5V and 3.3V Supplies from Overcurrent and Short-Circuit Faults s LOCAL_PCI_RST# Logic On-Chip s PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction s Adjustable Supply Voltage Power-Up Rate U APPLICATIO S s Hot Board Insertion into CompactPCI Bus LTC1644 CompactPCI Bus Hot Swap Controller DESCRIPTIO The LTC®1644 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a CompactPCI bus slot. External N-channel transistors control the 3.3V/5V supplies, while on-chip switches control the –12V and 12V supplies. The 3.3V and 5V supplies can be ramped up at a programmable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. 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 combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group. TYPICAL APPLICATIO ...