An output-capacitor-free buck converter with nano-second-DVS and sub-switching-cycle load transient response

Author

Yi Zhang ; Dongsheng Ma

Author_Institution

Integrated Syst. Design Lab., Univ. of Texas at Dallas, Richardson, TX, USA

fYear

2012

fDate

Oct. 29 2012-Nov. 1 2012

Firstpage

1

Lastpage

4

Abstract

An output-capacitor-free switching buck converter is proposed in this paper. By removing the off-chip capacitor, both the PCB footprint and system volume can be reduced. Due to the smaller output capacitance and added pull-up/down power transistors, the dynamic voltage scaling (DVS) tracking speed can be improved to nano-seconds/volt level. The load transient response of the proposed switching converter is also improved within one switching cycle. The proposed buck converter is designed with TSMC 0.35-μm CMOS process, regulating a 1.2~1.8V output voltage from a 3-V input power supply at 2-MHz switching frequency. A 63-ns/V DVS tracking speed is achieved with 100-pF filtering capacitor. The output voltage is recovered within one switching cycle when a 270mW load change occurs.

Keywords

CMOS integrated circuits; power transistors; printed circuits; switching convertors; transient response; PCB footprint; TSMC CMOS process; capacitance 100 pF; dynamic voltage scaling tracking; filtering capacitor; frequency 2 MHz; nanosecond-DVS tracking; off-chip capacitor; output-capacitor-free switching buck converter; power 270 mW; pull-up-down power transistors; size 0.35 mum; subswitching-cycle load transient response; voltage 3 V; Capacitors; Power transistors; Steady-state; Switches; Switching frequency; Transient response; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated Circuit Technology (ICSICT), 2012 IEEE 11th International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4673-2474-8

Type

conf

DOI

10.1109/ICSICT.2012.6467933

Filename

6467933