The Micrel MIC22400 is a high efficiency 4A integrated switch synchronous buck (step-down) regulator. The MIC22400 is optimized for highest efficiency and achieves over 90% efficiency while still switching at 1MHz over a broad load range. The ultra high speed control loop keeps the output voltage within regulation even under extreme transient load swings 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. A full range of sequence options are available with the MIC22400. The enable/delay pin combined with the power good pin allows multiple outputs to be sequenced in any way on turn on and turn off. The RC (Ramp ControlTM) pin allows the device to be connected to another MIC22400 family of products to keep the output voltages within a certain V on start up.