Fully integrated synchronous buck regulator offers 95 percent efficiency over a broad load range

Micrel has unveiled a high power density family of buck regulators that features 10 A integrated SuperThermal MOSFETs and is optimized for highest efficiency.

The MIC22950 synchronous step-down regulator incorporates a 1 μH inductor and a 100μF output capacitor and claims to achieve more than 95 percent efficiency over a broad load range. The device also features built-in sequencing, tracking and ramp control capabilities enabling multiple power-up sequencing and tracking protocols.

The solution is ideal 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.

The MIC22950 has an ultra-high 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 0.7 V to address all low voltage power needs, from a 3.3 V or 5 V 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. The RC (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.

The MIC22950 has thermal shutdown and current limit protection, is available in a 32-pin 5 mm x 5 mm MLF, and offers a junction operating range from -40 to +125 degrees C.

“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, vice president of analog marketing.

Availability and Pricing

The MIC22950 is currently available in volume quantities with pricing starting at $4.31 for 1K quantities.



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