On-chip boost regulator with projected off- and on-time control |
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| Authors: | Xiao-ru Xu Meng-lian Zhao Xiao-bo Wu |
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| Institution: | (1) Institute of VLSI Design, Zhejiang University, Hangzhou, 310027, China |
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| Abstract: | The boost type power supplies are widely used in portable consumer electronics to step up the input voltage to adapt for the
high voltage applications like light-emitting diode (LED) driving and liquid crystal display (LCD) biasing. In these applications,
a regulator with small volume, fewer external components and high efficiency is highly desired. This paper proposes a projected
off- and on-time boost control scheme, based on which a monolithic IC with an on-chip VDMOS with 0.2 Ω on-state resistance
R
DS-ON was implemented in 1.5 μm bipolar-CMOS-DMOS (BCD) process. A 12 V, 0.3 A boost regulator prototype is presented as well.
With projected off-time and modulated on-time in continuous conduction mode (CCM), a quasi fixed frequency, which is preferred
for ripple control, is realized. With projected on-time and modulated off-time in discontinuous conduction mode (DCM), pulse
frequency modulation (PFM) operation, which is beneficial to light load efficiency improvement, is achieved without extra
control circuitry. Measurement results show that an efficiency of 3% higher than that of a conventional method under 0.5 W
output is achieved while a step load transient response comparable to that of current mode control is maintained as well.
Project (No. 90707002) supported by the National Natural Science Foundation of China |
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| Keywords: | Boost regulator Integrated circuits Pulse frequency modulation Projected off-time Projected on-time |
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