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A high frequency and high efficiency DC-DC converter with sensorless adaptive-sizing technique is proposed. Instead of conventional adaptive-sizing technique with current sensor, the proposed converter estimates the load current according to the output voltage of error amplifier for switch scaling. The elimination of current sensor reduces power consumption, thus improving efficiency further. This design is validated through simulation in a 0.18 μm CMOS process. At switching frequency of 150MHz and light-load of 20mA, the proposed converter achieves a high efficiency of 82.4%, while it is 73.7% with conventional adaptivesizing technique, and 62.4% without adaptive-sizing technique.

High frequency and high efficiency DC-DC converter with sensorless adaptive-sizing technique