DESCRIPTION
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.

FEATURES
■ Allows Safe Board Insertion and Removal from a Live, CompactPCITM Bus
■ Controls –12V, 3.3V, 5V and 12V Supplies
■ Programmable Foldback Current Limit with Circuit Breaker
■ Dual-Level Circuit Breakers Protect 5V and 3.3V 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

APPLICATIONS
■ Hot Board Insertion into CompactPCI Bus