DocumentCode :
727121
Title :
An all-digital power management unit with 90% power efficiency and ns-order voltage transition time for DVS operation in low power sensing SoC applications
Author :
Chung-Shiang Wu ; Kai-Chun Lin ; Yi-Ping Kuo ; Po-Hung Chen ; Yuan-Hua Chu ; Wei Hwang
Author_Institution :
Dept. of Electron. Eng. & Inst. of Electron., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fYear :
2015
fDate :
24-27 May 2015
Firstpage :
1370
Lastpage :
1373
Abstract :
A 1V~1.2V battery input, 0.4V~0.6V output low-power all-digital power management unit (PMU) composed of a high-efficiency digital buck converter (DBC) and a fast-transient digital low drop-out (DLDO) regulator is developed for energy-efficient SoC applications. A fully integrated 2-to-1 switched-capacitor dc-dc converter is combined together to reduce the quiescent current of digital control circuits. The digital pulse width modulation (DPWM) with clock frequency gating further reduces the power consumption of buck converter in steady state. From experiment results, the peak power efficiency of the proposed buck converter is 90% with an output power range of 30μW to 3mW and the peak current efficiency of DLDO is 98.8% at 5mW. Moreover, the proposed DLDO achieves 92ns/130ns transition time in 60mV voltage step to dynamically scaling the voltage of supply voltage in digital circuits. This chip is designed and fabricated in 65nm CMOS process for verification.
Keywords :
DC-DC power convertors; PWM power convertors; energy conservation; system-on-chip; CMOS process; DBC; DLDO regulator; DPWM; DVS operation; PMU; SoC applications; all-digital power management unit; clock frequency gating; digital control circuits; digital pulse width modulation; fast-transient digital low drop-out regulator; high-efficiency digital buck converter; low power sensing; ns-order voltage transition time; switched-capacitor dc-dc converter; voltage dynamic scaling; Clocks; DC-DC power converters; Delays; Phasor measurement units; Switches; System-on-chip; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
Type :
conf
DOI :
10.1109/ISCAS.2015.7168897
Filename :
7168897
Link To Document :
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