Micrel has added the MIC22950 to its high power density family of buck regulators. The synchronous step-down regulator features 10 A integrated SuperThermal MOSFETs and is optimised for high efficiency – with just a 1 μH inductor and a 100 μF output capacitor, the device achieves more than 95% efficiency over a broad load range. It also features built-in sequencing, tracking and ramp control capabilities, enabling multiple power-up sequencing and tracking protocols. The solution is suitable 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 a 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 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 startup. The MIC22950 has thermal shutdown and current limit protection, is available in a 32-pin 5 x 5 mm MLF, and offers a junction operating range from -40°C to +125°C.
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