MIC23031

MIC23031 4MHz PWM 400mA Buck Regulator with HyperLight Load™ General Description The MIC23031 is a high-efficiency 4MHz 400mA synchronous buck regulator with HyperLight Load™ mode. HyperLight Load™ provides very-high efficiency at light loads and ultra-fast transient response which is perfectly suited for supplying processor core voltages. An additional benefit of this proprietary architecture is very-low output ripple voltage throughout the entire load range with the use of small output capacitors. The tiny 1.6mm x 1.6mm Thin MLF® package saves precious board space and requires only three external components. The MIC23031 is designed for use with a very-small inductor, down to 0.47µH, and an output capacitor as small as 2.2µF that enables a sub-1mm height. The MIC23031 has a very-low quiescent current of 21µA and achieves as high as 88% efficiency at 1mA. At higher loads, the MIC23031 provides a constant switching frequency around 4MHz while achieving peak efficiencies up to 93%. The MIC23031 is available in a 6-pin 1.6mm x 1.6mm Thin MLF® package with an operating junction temperature range from –40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Typical Application Features Input voltage: 2.7V to 5.5V 400mA output current Up to 93% efficiency and 88% at 1mA 21µA typical quiescent current 4MHz PWM operation in continuous mode Ultra-fast transient response Low voltage output ripple – 20mVpp ripple in Hy...