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Buck regulator boasts over 95% efficiency

Posted: 08 Jan 2010 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulator? MOSFET? capacitor?

Micrel Inc. claims that the MIC22950 synchronous step-down regulator is a pioneering high-power density product. The regulator features a 10A integrated SuperThermal MOSFET and achieves more than 95 percent efficiency over a broad load range with just a 1?H inductor and a 100?F output capacitor.

It also features built-in sequencing, tracking and ramp control capabilitiesenabling multiple power-up sequencing and tracking protocols. The solution is suited for high power density point-of-load conversion, base stations, servers and routers, Blu-ray players, computer peripherals, FPGAs, DSPs and low voltage ASIC power applications.

"Super-high power density in a small footprint combined with 95 percent efficiency offer remarkable benefits in advanced applications such as Super 3G/LTE base stations, servers and workstations," noted Andrew Cowell, VP of analog marketing, Micrel. "The MIC22950 is extremely easy to use and saves significant BOM cost for the designer by integrating Micrel's unique SuperThermal MOSFETs."

The regulator has an ultrahigh speed control loop that keeps the output voltage within regulation even under extreme transient load swings that are commonly found in FPGAs and low voltage ASICs. The output voltage can be adjusted down to 0.7V to address all low voltage power needs, from a 3.3V or 5V power bus. A full range of sequencing and tracking options is available. The Enable/Delay pin, combined with the Power Good/POR pin, allows multiple outputs to be sequenced as desired during turn-on and turn-off. A ramp control pin allows the device to be connected to another product in Micrel's MIC22xxx and/or its MIC68xxx family, thereby allowing the designer to maintain the output voltages within a certain delta-V on start up. It features thermal shutdown and current limit protection, is available in a 32-pin 5mm x 5mm MLF, and offers a junction operating range from -40C to +125C.

The MIC22950 is currently available in volume quantities with pricing starting at $4.31 for 1K quantities. Samples can now be ordered.

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