Title :
A buck DC-DC converter using automatic PFM/PWM mode change for high-efficiency Li-ion battery charger
Author :
Thanh Tien Ha ; Do-Young Chung ; Dasom Park ; Hyun-Sik Lee ; Jong-Wook Lee
Author_Institution :
Sch. of Electron. & Inf., Kyung Hee Univ., Suwon, South Korea
Abstract :
We present a high efficiency buck DC-DC converter for switch-mode Lithium-ion (Li-ion) battery charger. To achieve a high efficiency over a wide load range, the converter enters a power saving pulse-frequency modulation (PFM) mode at light load currents. And the proposed buck converter features an automatic mode change between pulse-width modulation (PWM) and PFM depending on the load current level. The chip was fabricated in a 0.18 μm 1-poly 6-metal standard CMOS process in a 1.28 × 1.19 mm2. The maximum efficiency is 93%.
Keywords :
CMOS integrated circuits; DC-DC power convertors; PWM power convertors; battery chargers; pulse frequency modulation; secondary cells; I-poly 6-metal standard CMOS process; automatic PFM-PWM mode change; buck DC-DC converter; high-efficiency Li-Ion battery charger; power saving pulse-frequency modulation mode; pulse-width modulation; size 0.18 mum; switch-mode lithium-ion battery charger; Detectors; Manganese; Pulse width modulation; Switches; DC-DC switching converter; Li-ion charger; PFM/PWM techique;
Conference_Titel :
SoC Design Conference (ISOCC), 2014 International
DOI :
10.1109/ISOCC.2014.7087625
