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Symmetry 2017, 9(1), 18; https://doi.org/10.3390/sym9010018

Fully Integrated on-Chip Switched DC–DC Converter for Battery-Powered Mixed-Signal SoCs

1
Samsung Electronics Co., Ltd., Gyeonggi-do 16677, Korea
2
Department of Electronic Engineering, Daegu University, Gyeongsan 38453, Korea
3
Department of Electrical and Computer Engineering, Northeastern University, 360 Huntington Ave., Boston, MA 02115, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Ka Lok Man
Received: 6 November 2016 / Revised: 27 December 2016 / Accepted: 10 January 2017 / Published: 22 January 2017
(This article belongs to the Special Issue Symmetry in Systems Design and Analysis)
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Abstract

This paper presents a fully integrated on-chip switched-capacitor (SC) DC–DC converter that supports a programmable regulated power supply ranging from 2.6 to 3.2 V out of a 5 V input supply. The proposed 4-to-3 step-down topology utilizes two conventional 2-to-1 step-down topologies; each of them (2-to-1_up and 2-to-1_dw) has a different flying capacitance to maximize the load current driving capability while minimizing the bottom-plate capacitance loss. The control circuits use a low power supply provided by a small internal low-drop output (LDO) connected to the internal load voltage (VL_dw) from the 2-to-1_dw, and low swing level-shifted gate-driving signals are generated using the internal load voltage (VL_dw). Therefore, the proposed implementation reduces control circuit and switching power consumptions. The programmable power supply voltage is regulated by means of a pulse frequency modulation (PFM) technique with the compensated two-stage operational transconductance amplifier (OTA) and the current-starved voltage controlled oscillator (VCO) to maintain high efficiency over a wide range of load currents. The proposed on-chip SC DC–DC converter is designed and simulated using high-voltage 0.35 μm bipolar, complementary metal-oxide-semiconductor (CMOS) and DMOS (BCDMOS) technology. It achieves a peak efficiency of 74% when delivering an 8 mA load current at a 3.2 V supply voltage level, and it provides a maximum output power of 48 mW (IL = 15 mA at VL_up = 3.2 V) at 70.5% efficiency. The proposed on-chip SC voltage regulator shows better efficiency than the ideal linear regulator over a wide range of output power, from 2.6 mW to 48 mW. The 18-phase interleaving technique enables the worst-case output voltage ripple to be less than 5.77% of the load voltage. View Full-Text
Keywords: on-chip DC–DC converter; switched capacitor; SMPS (Switched-Mode Power Supply); bottom-plate capacitor; monolithic voltage conversion on-chip DC–DC converter; switched capacitor; SMPS (Switched-Mode Power Supply); bottom-plate capacitor; monolithic voltage conversion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jeon, H.; Kim, K.K.; Kim, Y.-B. Fully Integrated on-Chip Switched DC–DC Converter for Battery-Powered Mixed-Signal SoCs. Symmetry 2017, 9, 18.

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