Hot swap controller for 3,3/5 V compact PCI applications

28 February 2001 Power Electronics / Power Management

Linear Technology's LTC1646 is a CompactPCI hot swap controller that allows cards to be safely inserted or removed while the system is running. The LTC1646 directly controls the 3,3 and 5 V supplies for those applications not utilising the +12 V supplies provided by the system. The controller ramps up the supplies in a controlled manner to minimise the potentially damaging in-rush current. It also provides a pre-charge bias for the I/O pins.

The CompactPCI bus is becoming popular in industrial, embedded control and networking server applications due in part to its hot swap control features. The LTC1646 supports the hardware necessary to implement the software features within the CompactPCI specification. While the specification provides 3,3, 5 and +12 V supplies to the backplane, plug-in cards are not required to use them all. The device is specifically designed for those applications that use only the 3,3 and 5 V supplies - or even just one of the 3,3 or 5 V rails - not the +12 V supplies. An internal 15 V charge pump ramps up external N-channel MOSFETs to turn on and off the supplies in a controlled manner. The controlled power up helps prevent supply glitches during power-up and also prevents excessive power dissipation while protecting the board if a short exists. The circuit breakers provide protection if an over-current fault or short-circuit occurs. Foldback current limiting lets the supplies power up in current limit for a specified period of time; this allows the LTC1646 to power boards with widely varying capacitive loads and limit transients without tripping the circuit breakers.

The controller comes in the narrow 16-pin SSOP screened to both the commercial and industrial temperature ranges.

Insight Memec

(021) 674 4124

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