LTC Offers LTC4240 I_C Hot-Swap Controller

Linear Technology Corp. (LTC, Milpitas, CA) introduced the LTC4240, an I_C Hot-Swap™ controller that allows a board to be safely inserted and removed from a live CompactPCI® bus slot. The LTC4240 controls all four CompactPCI supplies by employing two external n-channel transistors for the 3.3V and 5V supplies, while two on-chip switches regulate the ±12V supplies. Electronic circuit breakers protect all four supplies against over-current faults and a power-good output indicates when all of the supply voltages are within tolerance.

The LTC4240 has a built-in, two-wire, I_C-compatible interface that permits software control and monitoring of device functions as well as power supply status. It also gives the user the ability to turn the device on or off, set the RESETOUT, turn on a status LED driver, and ignore ±12V faults. The part also provides a pre-charge bias for the I/O pins and combines the PCI_RST# signal with the HEALTHY# to make the LOCAL_PCI_RST# signal, and meets the tight PCI timing requirements, eliminating the need for external logic.

The LTC4240 is offered in a 28-pin, narrow SSOP package, and is available for both commercial and industrial temperature ranges. Pricing starts at $4.25 each for 1,000-piece quantities.