Topic
Voltage regulator
About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.
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Patent•
25 Apr 1994TL;DR: In this paper, a power supply start up booster circuit is proposed for providing an increased startup voltage for a switch mode control integrated circuit including a boost portion for combining a first input voltage that has a predetermined minimum value and a second voltage that transitions from 0 volts to a predetermined threshold voltage to make a minimum threshold voltage.
Abstract: A power supply start up booster circuit for providing an increased startup voltage for a switch mode control integrated circuit including a boost portion for combining a first input voltage that has a predetermined minimum value and a second input voltage that transitions from 0 volts to the predetermined minimum value to make a minimum threshold voltage, a control portion having an integrated circuit for using the minimum threshold voltage to temporarily provide a voltage input at the integrated circuit, and an output portion for providing a permanent voltage input at the integrated circuit and an output supply voltage to an external circuit.
68 citations
Patent•
20 Nov 2009TL;DR: In this article, a switch-mode voltage regulator was proposed, consisting of an inductor, a generator for producing a voltage ramp, and switch control circuitry for controlling switching of a current in the inductor according to a pulse stream.
Abstract: The invention concerns a switch-mode voltage regulator, comprising : an inductor (L); a generator for producing a voltage ramp ( 16 ); circuitry ( 12, 13 ) for producing at least one pulse stream from said voltage ramp; switch control circuitry ( 14 ) for controlling switching of a current in the inductor according to said pulse stream; and a first control loop adapted to modulate the form of the voltage ramp according to the current flowing in the inductor.
68 citations
01 Jan 2011
TL;DR: In this paper, the authors show that the SC converter can outperform the buck converter, and thus the scope of SC converter application can and should be expanded, while requiring less board area and less costly passive components.
Abstract: The traditional inductor-based buck converter has been the default design for switched-mode voltage regulators for decades. Switched capacitor (SC) dc-dc converters, on the other hand, have traditionally been used in low power ( 80% over a load range of 5 mA to 1 A) than surveyed competitive buck converters, while requiring less board area and less costly passive components. The topology and controller enable a wide input range of 7.5 V to 13.5 V. Controls based on feedback and feedforward provide tight regulation under worst case line and load step conditions. This work shows that the SC converter can outperform the buck converter, and thus the scope of SC converter application can and should be expanded.
68 citations
07 Aug 2002
TL;DR: A new frequency compensation scheme for LDR is proposed to optimize the regulator performance over a wide load current range by introducing a tracking zero to cancel out the regulator output pole, and the frequency response of the feedback loop becomes load current independent.
Abstract: Most low dropout regulators (LDRs) have a limited of load current operating range due to stability problems. This paper proposes a new frequency compensation scheme for LDR to optimize the regulator performance over a wide load current range. By introducing a tracking zero to cancel out the regulator output pole, the frequency response of the feedback loop becomes load current independent. The open-loop DC gain is boosted up by a low frequency dominant pole, which increases the regulator accuracy. To demonstrate the feasibility of the proposed scheme, a LDR utilizing the new frequency compensation scheme is designed and fabricated using the TSMC 0.35/spl mu/m digital CMOS process. Simulation results show that with output current from 0 /spl mu/A to 100 mA, the bandwidth variation is only 2.3 times and the minimum DC gain is 72 dB. Measurement of the dynamic response matches well with simulation.
68 citations
TL;DR: In this paper, the authors proposed a new small signal model to study the sample hold effect in coupled-inductor implementations, and the relationship between the coupling coefficient and the sampling hold effect is discussed.
Abstract: Today's voltage regulator (VR) for the microprocessor requires a current loop to achieve adaptive voltage positioning and phase current sharing. A fundamental limitation, current loop sample hold effect, limits the control bandwidth to be pushed beyond 1/6 of the switching frequency. This paper reveals the limitation of the control bandwidth of a two-phase buck converter using peak current control scheme. The limitation can be overcome by coupling the two output inductors. A new small signal model is proposed to study the sample hold effect in coupled-inductor implementations. The relationship between the coupling coefficient and the sample hold effect is then discussed. Based on these understandings, a strongly coupled two-phase buck converter has double the bandwidth of the noncoupled VR; and this is experimentally verified
68 citations