A fast-transient-response hybrid buck converter with automatic and nearly-seamless loop transition for portable applications

Liu, Yonggen; Zhan, Chenchang; Ki, Wing-Hung

doi:10.1109/esscirc.2012.6341274

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…Different from the prior art [5,6], where the linear regulators are independently controlled by V OUT , the instantaneous I L value determines if the current pump should be turned on while the switching converter operates constantly. To determine if the current pump should be active, V SENS_IL is compared to V SENS_DC .…”

Section: System Architecture and Operationmentioning

confidence: 99%

“…Unfortunately, while it operates well to step-up load changes, it lacks a control mechanism to speed up the step-down load transient response. Recently, techniques using a push-pull circuit stage have been reported [5,6] to overcome the drawback in [4]. Such a push-pull circuit can be considered as a push-pull linear regulator, which is connected in parallel with a switching converter at the output.…”

Section: Introductionmentioning

confidence: 99%

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A 40-MHz current-mode hysteretic controlled switching converter with digital push-pull current pumping technique for high performance microprocessors

Sankman

Song

2014

Technical Papers of 2014 International Symposium on VLSI Design, Automation and Test

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Figure 1(a). Generalized parallel feedback topology of the prior art and (b) Key waveforms of the parallel feedback approach. (b)Abstract-Ever-increasing power demands of microprocessors have necessitated fast-response, high-speed power converters. This paper presents a fast transient, hysteretic current-mode converter design with a push-pull current pump. By using a current feedback technique in contrast with the parallel feedback control approaches by the prior art, performance and stability are greatly enhanced. The system is implemented and verified on a 0.18 μm CMOS process through fully transistorlevel simulations, operating up to 40 MHz. In comparison with the buck converter by itself, the current pump improves the transient response by reducing V OUT undershoot magnitude and settling time by 33.3% and 25.6%, respectively, and overshoot magnitude and settling time by 18.3% and 40.4%, respectively. Undershoot and overshoot are maintained below 3%, at 2.8% and 2.9%, respectively.

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Section: System Architecture and Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 40-MHz current-mode hysteretic controlled switching converter with digital push-pull current pumping technique for high performance microprocessors

Sankman

Song

2014

Technical Papers of 2014 International Symposium on VLSI Design, Automation and Test

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“…In Ref. [27], load transients cannot be detected automatically, and the converter has to be informed by a processor that may not be available in a real application. In Refs.…”

Section: Design Challenges Of Hybrid Schemementioning

confidence: 99%

“…It consists of the parallel operation of the DC-DC converter and a linear regulator. This is a common scheme in designing the supply modulator of a power amplifier [25,26] , and has been employed to im-prove transient responses [27][28][29][30][31] . It is essential that the linear regulator should only be activated during load transients and is completely deactivated in the steady state such that efficiency is not compromised.…”

Section: Introductionmentioning

confidence: 99%

Fast-transient techniques for high-frequency DC–DC converters

Cheng

Tang

et al. 2020

J. Semicond.

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A 30 MHz voltage-mode controlled buck converter with fast transient responses is presented. An improved differential difference amplifier (DDA)-based Type-III compensator is proposed to reduce the settling times of the converter during load transients, and to achieve near-optimal transient responses with simple PWM control only. Moreover, a hybrid scheme using a digital linear regulator with automatic transient detection and seamless loop transition is proposed to further improve the transient responses. By monitoring the output voltage of the compensator instead of the output voltage of the converter, the proposed hybrid scheme can reduce undershoot and overshoot effectively with good noise immunity and without interrupting the PWM loop. The converter was fabricated in a 0.13 μm standard CMOS process using 3.3 V devices. With an input voltage of 3.3 V, the measured peak efficiencies at the output voltages of 2.4, 1.8, and 1.2 V are 90.7%, 88%, and 83.6%, respectively. With a load step of 1.25 A and rise and fall times of 2 ns, the measured 1% settling times were 220 and 230 ns, with undershoot and overshoot with PWM control of 72 and 76 mV, respectively. They were further reduced to 36 and 38 mV by using the proposed hybrid scheme, and 1% settling times were also reduced to 125 ns.

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A low load- and cross-regulation SIDO converter using an adaptive current sensor and LDO regulator with a selectable charge pump for mobile devices

Jung

Hong

Kwon

2017

Analog Integr Circ Sig Process

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A fast-transient-response hybrid buck converter with automatic and nearly-seamless loop transition for portable applications

Cited by 12 publications

References 6 publications

A 40-MHz current-mode hysteretic controlled switching converter with digital push-pull current pumping technique for high performance microprocessors

A 40-MHz current-mode hysteretic controlled switching converter with digital push-pull current pumping technique for high performance microprocessors

Fast-transient techniques for high-frequency DC–DC converters

A low load- and cross-regulation SIDO converter using an adaptive current sensor and LDO regulator with a selectable charge pump for mobile devices

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