A Dynamic Bootstrap Voltage Technique for a High-Efficiency Buck Converter in a Universal Serial Bus Power Delivery Device

作者：Chen Wei Chung^*; Chou Ying Wei; Chien Meng Wei; Chen Hsin Chieh; Yang Shang Hsien; Chen Ke Horng; Lin Ying Hsi; Lee Chao Cheng; Lin Shian Ru; Tsai Tsung Yen

来源：IEEE Transactions on Power Electronics, 2016, 31(4): 3002-3015.

DOI：10.1109/TPEL.2015.2453511

• Adjustable bootstrap capacitance (ABC)
• dual N-type MOSFETs
• dynamic bootstrap voltage (DBV)
• light-load efficiency

The dynamic bootstrap voltage (DBV) technique is proposed to keep high efficiency over wide ranges of load currents for high-power universal serial bus devices. The silicon area of the embedded power management with the DBV technique in the system-on-a-chip can be effectively reduced to 50% of the conventional design with a P-type high-side power MOSFET. Test chips fabricated in 0.25-mu m CMOS process showed a 92% peak efficiency from 1 mA to 1 A. The maximum driving current was higher than 5 A, and the efficiencywas 88%. Compared with the efficiency of the converter without the DBV technique, the efficiency of the converter with DBV technique was improved by about 28%.

• 出版日期2016-4