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Low-Ripple and Dual-Phase Charge Pump Circuit Regulated by Switched-Capacitor-Based Bandgap Reference | IEEE Journals & Magazine | IEEE Xplore
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Journals & Magazines >IEEE Transactions on Power El... >Volume: 24 Issue: 5

Low-Ripple and Dual-Phase Charge Pump Circuit Regulated by Switched-Capacitor-Based Bandgap Reference

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Ming-Hsin Huang; Po-Chin Fan; Ke-Horng Chen
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Abstract:

This paper proposes a low-ripple and dual-phase charge pump circuit regulated by switched-capacitor-based bandgap reference. Due to design of a buffer stage, a system can...Show More

Metadata

Abstract:

This paper proposes a low-ripple and dual-phase charge pump circuit regulated by switched-capacitor-based bandgap reference. Due to design of a buffer stage, a system can have better bandwidth and phase margin, and thus, the transient response and driving capability can be improved. Besides, the dual-phase control can reduce the output voltage ripple by means of only one closed-loop regulation in order to improve the power conversion efficiency. Besides, the proposed automatic body switching (ABS) circuit can efficiently drive the bulk of the power p-type MOSFETs to avoid leakage and potential latch-up. Usually, the regulated charge pump circuit needs a bandgap reference circuit to provide a temperature-independent reference voltage. The switched-capacitor-based bandgap reference circuit is utilized to regulate the output voltage. This chip was fabricated by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35 mum 3.3 V/5 V 2P4M CMOS technology. The input voltage range varies from 2.9 to 5.5 V, and the output voltage is regulated at 5 V. Experimental results demonstrate that the charge pump can provide 48 mA maximum load current without any oscillation problems.
Published in: IEEE Transactions on Power Electronics ( Volume: 24, Issue: 5, May 2009)
Page(s): 1161 - 1172
Date of Publication: 17 April 2009

ISSN Information:

DOI: 10.1109/TPEL.2008.2010546
References is not available for this document.
Contents

I. Introduction

At the present, portable electronic devices such as mobile phones or digital cameras are the emerging market of electronic devices, even called the daily essentials. The demand for the portable electronic devices makes the power supply circuit more and more important. in general, the operating time or standby time of the portable devices all depends on the battery capacity. Efficient power distribution is the main concern in the portable device [1]–[4]. On the other hand, the size and weight of these power devices are also important for the designers. The miniaturization of the power modules and the reduction of the external components are essential in portable devices. Besides, the size of the power supply circuit is the major design consideration, no matter whether the circuit is fabricated as a single chip or integrated into a system-on-chip (SoC) chip. for the portable electronic devices, the reduction of the area on silicon and printed circuit broad (PCB) means lower fabrication cost and tinier size. in other words, a compact power supply system is necessary for the power management of the SoC systems. Therefore, the trend is to focus on the CMOS implementation of power converters and insert the power modules into any portable device. Table I shows the different implementation techniques that can be used to supply different applications. for today's designers, how to find an optimum solution has become an urgent issue. Comparison of the Different Power Supply Devices

LDO Charge Pump Switching Regulator
Efficiency Bad Good Best Up to 95% and averageabout 90%
Cost Best Moderate Capacitor count,pin count, siliconarea drive costs Most expensive Inductor and otherexternal componentsdrive costs
Difficulty in Design Easv Harder Most difficult
PCB Area Very small Small LargeDue to the height andarea of inductor
Output Ripple Very low Moderate Moderate
EMI Very low Low Moderate
Load Capability ModerateUp to 150mA ModerateUp to 250mA BestAble to above 500mA
Transfonnation Type Step down Step up Step down Inverter Step up Step down Inverter

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