Haynes and Boone, LLP (36340)
Switching regulator current sensing circuits and methods
In one embodiment, a switching regulator includes an inductor, a first switch, and a second switch. The first and second switches generate current in the inductor. Inductor current may flow through the second switch with both a positive and negative polarity. Voltages on terminals of the second switch may be sensed, and an offset applied to generate a level shifted signal. In one embodiment, the switching regulator is a boost switching regulator, and the offset is generated using a current source. Matched MOS transistor switches may be used to couple voltages on terminals of the second switch to amplifier inputs, and the offset is introduced across an MOS switch coupled between one amplifier input and the output.
QUALCOMM Incorporated
H H G
H02M H02M G05F
inventional additional inventional
Yikai Joseph Jiwei
Wang Rutkowski Chen