A Current-Mode Hysteretic Buck Converter With Multiple-Reset RC-Based Inductor Current Sensor

A current-mode hysteretic buck converter is described in which inductor current is sensed by a resistor-capacitor (RC) network. The inductor current sensing RC network is reset multiple times per switching clock period, which allows it to have time constant much smaller than switching clock period a...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2019-11, Vol.66 (11), p.8445-8453
Main Authors: Jeong, Min-Gyu, Kang, Jin-Gyu, Park, Jeongpyo, Yoo, Changsik
Format: Article
Language:English
Subjects:
Buck converter
Buck converters
CMOS
current-mode
dc–dc converter
Delays
Electronics
Energy conversion efficiency
Hysteresis
hysteretic control
inductor current sensor
Inductors
Metal oxides
Power efficiency
Regulators
Silicon
Switching
Switching frequency
Time constant
Voltage control
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Description
Summary:A current-mode hysteretic buck converter is described in which inductor current is sensed by a resistor-capacitor (RC) network. The inductor current sensing RC network is reset multiple times per switching clock period, which allows it to have time constant much smaller than switching clock period and therefore occupy small silicon area. A frequency regulator ensures the switching frequency to be constant regardless of the operating condition of the buck converter and also integrates comparator delay compensator as its loop filter. The current-mode hysteretic buck converter implemented in a 65 nm complementary metal-oxide-semiconductor (CMOS) process provides 0.6-2.0 V output from 3.3 V input with 1 MHz switching frequency. The maximum load current is 1.5 A and the measured peak power efficiency is 96.3%.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2889613