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A monolithic voltage-mode DC-DC converter with a novel oscillator and ramp generator
- Authors
- Chu, Hyunho; Kim, Jungmoon; Kim, Chulwoo
- Issue Date
- 10-Sep-2008
- Publisher
- IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
- Keywords
- DC-DC converter; pulsewidth-modulation (PWM); oscillator and ramp generator
- Citation
- IEICE ELECTRONICS EXPRESS, v.5, no.17, pp.683 - 688
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEICE ELECTRONICS EXPRESS
- Volume
- 5
- Number
- 17
- Start Page
- 683
- End Page
- 688
- ISSN
- 1349-2543
- Abstract
- A voltage-mode DC-DC converter with a novel oscillator and ramp generator is presented. The proposed oscillator and ramp generator has a simple structure and does not need an external reference signal generator to set the upper and lower levels of the ramp signal. The DC-DC converter was fabricated in a standard 0.5 mu m CMOS process. The converter can operate from 465 kHz to 556 kHz with a supply voltage from 3 to 5.5 V, which is appropriate for portable electronic devices that are powered by a single-cell lithium-ion battery. The output ripple voltage is about 10mV with a 10 mu off-chip capacitor and a 10 mu H off-chip inductor. The power conversion efficiency is over 80% for load currents from 30 to 400 mA.
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