A 10MHz 2mA-800mA 0.5V-1.5V 90% peak efficiency time-based buck converter with seamless transition between PWM/PFM modes

We present a 10MHz buck converter with enhanced light load efficiency achieved by combining time-based PWM control with PFM. The proposed seamless transition technique provides additional degree of freedom to extend high efficiency regime across a wider range of load current. Fabricated in a 65nm CMOS, the prototype achieves 90% peak efficiency and > 80% efficiency over Iload range of 2mA to 800mA. Vo changes by less than 40mV during PWM to PFM transitions.

[1]  Amr Elshazly,et al.  High Frequency Buck Converter Design Using Time-Based Control Techniques , 2015, IEEE Journal of Solid-State Circuits.

[2]  Mei-Ling Yeh,et al.  A High Efficiency Dual-Mode Buck Converter IC For Portable Applications , 2008, IEEE Transactions on Power Electronics.

[3]  Seth R. Sanders,et al.  Converter IC for Cellular Phone Applications , 2004 .

[4]  A.V. Peterchev,et al.  A 4-/spl mu/a quiescent-current dual-mode digitally controlled buck converter IC for cellular phone applications , 2004, IEEE Journal of Solid-State Circuits.

[5]  Robert W. Erickson,et al.  DC-DC converter design for battery-operated systems , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[6]  Vivek De,et al.  A 500 MHz, 68% efficient, fully on-die digitally controlled buck Voltage Regulator on 22nm Tri-Gate CMOS , 2014, 2014 Symposium on VLSI Circuits Digest of Technical Papers.