Chip maker Linear Technology Corp.(LTC---Milpitas, Calif.) is now fabbing a CompactPCI hot-swap controller IC that turns a board's supply voltages on and off in a controlled manner.
This capability permits a board to be safely inserted or removed from a live CompactPCI connector without glitching system power supplies. LTC's LTC4244 device controls 5-V and 3.3-V supply voltages with external N-channel FETS. Internal switches control 12-V supplies.
An absolute maximum supply voltage of 14.4-V gives you an extra degree of protection against spikes. Likewise, under-voltage lockouts ensure that the IC will only turn on once all power supplies are within operational limits. The part also pre-charges the bus I/O connector pins during hot insertion and extractions, limiting possible disturbances.
The LTC4244 also packs "circuit breakers" with fold-back current-limiting. Voltage monitors also provide a "health" signal to indicate that supplies are within regulation. The monitors, in combination with a PCI_RST# signal, in turn generate a LOCAL_PCI_RST# signal for a local processor.
LTC says its new LTC4244 chips can be ordered for commercial or industrial temperature-range operation. They come in 20-pin SSOP packages. Pricing starts at less than $4 a pop in 1,000-piece quantities.
For more details, contact Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, Calif. 95035-7417. Phone: 408-432-1900. LTC's Web site.