Freescale's MC34652 and MC34653 single-chip hot swap controllers provide the load current control and protection needed to help prevent damage that could result from power surges. This is important for users who need the ability to insert or remove circuit boards in live -48 volt back planes without powering down the system. Other features include:

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Maximum output current of 2.0 Amps on the MC34652, 1.0 Amp on the MC34653

Input voltage operation range from -15 volts to -80 volts on the MC34652, -39 volts to -74 volts on the MC34653

Over-current limiting with auto retry (default or programmable)

Charging current limit independent of load capacitor (default or programmable)

Start-up and retry delay timer (programmable option on the MC34652)

Over-voltage and under-voltage detection (programmable option on the MC34652)

Active high- and low-power good output signals

Disable input control

Thermal shutdown

RoHS compliant

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Production quantities of both devices are available now. The MC34652 is in a 16-lead small outline integrated circuit (SOIC) narrow body package for a suggested resale price of $2.15 (USD) in 1,000-piece quantities. Housed in an eight-lead SOIC narrow body package, the MC34653 has a suggested resale price of $1.82 (USD) in 1,000-piece quantities.