LTC1646CGN#PBF

LTC1646 is a Hot Swap™ controller that allows a board to be safely inserted and removed from a live CompactPCI bus slot. Two external N-channel transistors control the 3.3V and 5V supplies. The supplies can be ramped-up in current limit or a programmable rate. Electronic circuit breakers protect both supplies against overcurrent fault conditions. 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 logically combined on-chip with HEALTHY# in order to generate LOCAL-PCI-RST# which can be used to reset the CPCI card logic if either of the supply voltages is not within tolerance. It is used in application such as compactPCI bus removable boards etc.

• Programmable foldback current limit during power-up
• Dual level circuit breakers protect supplies from overcurrent and short-circuit faults
• User programmable supply voltage power-up rate
• PWRGD, RESETOUT and FAULT output
• 15V high side drive for external N-channel MOSFETS
• Supply current is 1.5mA typical
• Undervoltage lockout is 2.50V typical
• Operating temperature is 0°C to 70°C
• Package style is 16-lead plastic SSOP

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