Freescale Introduces New Hot Swap Controllers
Two advanced power management integrated circuits (ICs) from Freescale Semiconductor are available now to help designers of telecommunication and networking equipment reduce board space and cut system costs.
Freescale's MC34652 and MC34653 single-chip hot swap controllers provide the load current control and protection needed to help prevent severe and permanent damage that could result from power surges. This is important for users of telecom and networking systems, servers, electronic circuit breakers and central office switching equipment who need the ability to insert or remove circuit boards in live -48 volt back planes without powering down the system. These devices also are designed to provide system protection by intelligently limiting any inrush current that might damage equipment.
The MC34652 and MC34653 hot swap controllers integrate the power metal oxide semiconductor field effect transistors (MOSFET) required by most applications.
Other features include:
- 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
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.
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