PROJECT TITLE :

A 4-Phase 30–70 MHz Switching Frequency Buck Converter Using a Time-Based Compensator

ABSTRACT:

A high switching frequency multi-part buck converter design using a time-based mostly compensator is presented. Efficiency degradation because of mismatch between the phases is mitigated by generating exactly matched duty-cycles by combining a time-primarily based multi-phase generator (MPG) with a time-based PID compensator (T-PID). The proposed approach obviates the need for a complex current sensing and calibration circuitry required to implement active current sharing in an analog controller. It also eliminates the requirement for a high resolution analog-to-digital converter and digital pulse width modulator required for implementing passive current sharing in a very digital controller. Fabricated in a 65 nm CMOS process, the prototype multi-phase buck converter occupies a vigorous space of zero.thirty two mm$^2$, of which the controller occupies solely zero.04 mm$^2$ . The converter operates over a wide range of switching frequencies (30–70 MHz) and regulates output to any desired voltage within the vary of zero.half-dozen V to 1.five V from 1.8 V input voltage. With a 400 mA step within the load current, the settling time is but zero.half dozen $mu$ s and also the measured duty-cycle mismatch is less than 0.48percent. Better than eighty seven% peak efficiency is achieved whereas consuming a quiescent current of only 3 $mu$ A/MHz.