A Quasi-V2 Hysteretic Buck Converter with Adaptive COT Control for Fast DVS and Load-Transient Response in RF Applications
Journal
IEEE Transactions on Circuits and Systems II: Express Briefs
Journal Volume
67
Journal Issue
3
Pages
531-535
Date Issued
2020
Author(s)
Abstract
This brief proposes a buck converter with adaptive constant on time (ACOT) control, including transient-enhanced technique for fast dynamic voltage scaling (DVS) and load-transient response in RF applications. The proposed ACOT control achieves high performance in DVS tracking response to shorten up-tracking time and down-tracking time. Moreover, the high bandwidth transient-enhanced technique in ACOT control improves load-transient response suffering from low bandwidth compensation loop. In addition, the proposed buck converter operates at 2.5 MHz for high power density and 90.1% peak efficiency. This brief is implemented by TSMC 0.18 μm 1P6M CMOS technology with a chip area 1.81 mm2. Measurement results achieve that the output voltage have both 0.6 μs and 0.6 μs recovery time in 600 mA step-up load and 600 mA step-down load, respectively. For 0.6 V step, the output voltage have both 2 μs in up-tracking time and down-tracking time. ? 2004-2012 IEEE.
Subjects
Bandwidth; Power quality; Transient analysis; Voltage scaling; Buck converters; CMOS technology; Constant on time; DC-DC buck converter; High power density; Load transient response; RF applications; Tracking response; DC-DC converters
SDGs
Type
journal article