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A 50-MHz Fully Integrated Low-Swing Buck Converter Using Packaging Inductors
Youngkook Ahn,Hyunseok Nam,Jeongjin Roh IEEE 2012 IEEE transactions on power electronics Vol.27 No.10
<P>Implementation of on-chip passive elements and efficient regulation schemes are key aspects of fully integrated dc-dc converter design. This paper presents a 50-MHz fully integrated buck converter equipped with packaging inductors. These inductors include parasitic inductances of the bonding wires and lead frames in the package. They have significantly better Q factors than the best on-chip inductors implemented on silicon. This paper also presents full-swing and low-swing gate drivers for efficient regulation of high-frequency switching converters. The low-swing driver uses the drop voltage of a diode-connected transistor and is applied in a fabricated converter to reduce the gate driving loss caused by the high switching operation. The proposed converter is designed and fabricated using a 0.13-μm 1-poly 6-metal CMOS process. The fully integrated buck converter achieves 68.7% and 76.8 % efficiency for 3.3 V/2.0 V and 2.5 V/1.8 V conversions, respectively, while providing a load current of 250 mA.</P>
An Inductor-type Current-Mode Buck Converter For Mobile Applications
Youngkook Ahn,Donghun Heo,Hyunseok Nam,Jeongjin Roh 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
An inductor-type current-mode DC-DC buck converter was evaluated through HSPICE simulation with 0.18㎛ CMOS process parameters. The current programmed mode (CPM) controller is designed for improved controllability of the DC-DC converter. A DC-DC buck converter is able to operate from 2.5V to 3.3V supply voltage. Overall peak efficiency is about 92%.
새로운 게이트 드라이버를 이용한 완전 집적화된 DC-DC 벅 컨버터
안영국(Youngkook Ahn),전인호(Inho Jeon),노정진(Jeongjin Roh) 대한전자공학회 2012 電子工學會論文誌-SD (Semiconductor and devices) Vol.49 No.6
본 논문은 패키징 인덕터를 이용한 완전 집적화된 DC-DC 벅 컨버터를 소개한다. 사용된 패키징 인덕터는 본딩 와이어와 리드 프레임의 기생 인덕턴스를 포함한다. 이들은 실리콘 위에서 구현되는 온-칩 인덕터 보다 높은 Q 인자를 가진다. 또한 본 논문은 고주파 스위칭 컨버터의 효율적인 레귤레이션을 위해 로우-스윙 게이트 드라이버를 제안한다. 로우-스윙 드라이버는 다이오드-커넥티드 트랜지스터의 전압 드롭을 이용한다. 제안된 컨버터는 0.13-μm CMOS 공정을 통해 설계 및 제작되었다. 제작된 벅 컨버터의 효율은 입출력 전압비가 3.3 V/ 2.0 V와 2.8 V/ 2.3 V 일 때, 각각 68.7%, 86.6%로 측정되었다. This paper presents a fully-integrated buck converter equipped with packaging inductors. These inductors include parasitic inductances of the bonding wires and lead frames in the package. They have significantly better Q factors than the best on-chip inductors implemented on silicon. This paper also proposes a low-swing gate driver for efficient regulation of high-frequency switching converters. The low-swing driver uses the voltage drop of a diode-connect transistor. The proposed converter is designed and fabricated using a 0.13-μm CMOS process. The fully-integrated buck converter achieves 68.7% and 86.6% efficiency for 3.3 V/2.0 V and 2.8 V/2.3 V conversions, respectively.
Hyunseok Nam,Youngkook Ahn,Jeongjin Roh IEEE 2012 IEEE TRANSACTIONS ON POWER ELECTRONICS - Vol.27 No.1
<P>A high-voltage-tolerant buck converter with a novel adaptive power transistor driver is proposed in this paper. In order to minimize the <I>R</I><SUB>ON</SUB> of the cascode power transistor, the proposed scheme uses optimized and separated driving voltages for bias of the pMOS and nMOS power transistors. This increases not only the conversion efficiency, but also the maximum allowable load current for the transistor driver with small layout size, when compared to the buck converter with the earlier scheme. The measurements show that when the supply voltage is 2.5 V and the load current is 150 mA, the efficiency of the buck converter with the earlier scheme is 82%, whereas the efficiency of the buck converter with the proposed scheme is 92%, showing a maximum improvement of 10%. The designed buck converter uses the 0.35- μm-thick gate oxide CMOS process, and at 2.5-5 V of voltage, can supply up to 380 mA of load current. The total chip size is 2.7 mm<SUP>2</SUP>.</P>
A High Efficiency Boost Converter For TFT-LCD Bias Supply
Hyunseok Nam,Inseok Kim,Youngkook Ahn,Jeongjin Roh 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, a high efficiency boost converter is designed using a 0.5-㎛ 5V, 3.5-㎛ 30-V CMOS process for TFT-LCD Bias supply. The boost converter can be adjusted with external resistors. The boost converter’s input power supply range is 2.5V ∼ 5V, the output voltage range is 10V-20V and the clock frequency is 1.3 ㎒. The maximum load current is 120㎃ at an input power supply of 3V, output voltage of 20V and the maximum efficiency is 92% with input power supply at 5V, output voltage of 12V, and load current of 120㎃. The simulation results show the successful operation of the boost converter.