Browsing by Author "Lin, Chiun-He"

Now showing 1 - 5 of 5

200nA Low Quiescent Current Deep-Standby Mode in 28nm DC-DC Buck Converter for Active Implantable Medical Devices
(2015)
Chu, Li-Cheng
;
Yang, Te-Fu
;
Huang, Ru-Yu
;
Su, Yi-Ping
;
Lin, Chiun-He
the proposed deep-standby mode (DSM) is used in 28nm power management unit (PMU) for long-term usage in active implantable medical devices (AIMD). The PMU can upgrade its normal mode with the proposed embedded auto-cancellation (EAC) technique in order to have high accuracy even if the battery is aging and the PVT variations occur. The test chip fabricated in 28nm CMOS process features low quiescent current of 200nA and output voltage accuracy of 98%. Seamless transition among the DSM and the accurate mode demonstrates both low quiescent current and high accuracy can be achieved in the proposed PMU.
90% Peak Efficiency Single-Inductor-Multiple-Output DC-DC Buck Converter with Output Independent Gate Drive Control
(2015-01-01)
Su, Yi-Ping
;
Lin, Chiun-He
;
Peng, Shen-Yu
;
Huang, Ru-Yu
;
Yang, Te-Fu
95% Light-load Efficiency Single-Inductor Dual-Output DC-DC Buck Converter with Synthesized Waveform Control Technique for USB Type-C
(2016)
Yang, Wen-Hau
;
Lin, Chiun-He
;
Chen, Ke-Horng
;
Wey, Chin-Long
;
Lin, Ying-Hsi
The proposed single-inductor dual-output (SIDO) converter can provide wide range in duty ratio control to convert input voltage 520V to dual output voltages 3.3V and 1.2V when its switching frequency is raised to 10MHz for compact size solution. The proposed synthesized waveform control (SWC) technique can emulate the inductor current without being affected by switching noise. Thus, the minimum allowable duty ratio can be lowered to 6% to meet the requirement of USB-C in one-stage low duty ratio conversion. Moreover, the switching frequency is dynamically decreased by the derived DC loading information from the SWC technique. Not only the output power MOSFET but also the main power MOSFET switch in a load-dependent switching frequency for power saving. 67% more power reduction can be obtained. 95% and 83% efficiency are achieved at light and heavy loads, respectively, when the silicon is limited within 1400 mu m*1350 mu m.
CCM/GM Relative Skip Energy Control and Bidirectional Dynamic Slope Compensation in a Single-Inductor Multiple-Output DC-DC Converter for Wearable Device Power Solution
(2016-08)
Su, Yi-Ping
;
Lin, Chiun-He
;
Yang, Te-Fu
;
Huang, Ru-Yu
;
Chen, Wei-Chung
Compact size wearable devices require multiple supplies with relative large loading difference, which causes serious cross regulation, large ripple, and oscillation in single-inductor multiple-output (SIMO) DC-DC converter. Thus, a continuous conduction mode/green mode (CCM/GM) relative skip energy control (RSEC) in SIMO is proposed for wearable device power solution. Different from the conventional absolute skip method, the RSEC eliminates unnecessary skip-induced voltage ripple and cross regulation with well regulation performance over wide load and voltage ranges. Optimization between efficiency and voltage ripple achieves low noise supply and reduced switching loss. In addition, smooth transition between CCM and GM provides high power and longer usage time in wearable devices. Furthermore, bidirectional dynamic slope compensation conquers subharmonic oscillation and avoids invalid pulses in the energy delivery operation of current-mode SIMO DC-DC converters. The test chip fabricated in the 0.18 mu m CMOS process occupies 2.24 mm(2) active area. Maximum output ripple, overshoot/undershoot, and cross regulation are kept below 40 mV, 27 mV, and 0.0432 mV/mA, respectively.
CCM/GM Relative Skip Energy Control in Single-inductor Multiple-output DC-DC Converter for Wearable Device Power Solution
(2014)
Su, Yi-Ping
;
Lin, Chiun-He
;
Yang, Te-Fu
;
Huang, Ru-Yu
;
Chen, Wei-Chung
Compact size wearable devices require multiple supplies with relative large loading difference, which causes serious cross regulation, large ripple and oscillation in single-inductor multiple-output (SIMO) DC-DC converter. Thus, a continuous conduction mode/green mode (CCM/GM) relative skip energy control (RSEC) in single-inductor multiple-output (SIMO) is proposed for wearable device power solution. Different from conventional absolute skip method, the RSEC eliminates unnecessary skip-induced voltage ripple and cross regulation with well regulation performance over wide load and voltage ranges. Optimization between efficiency and voltage ripple achieves low noise supply and reduced switching loss. Moreover, smooth transition between CCM and GM provides high power and longer usage time in wearable devices. The test chip fabricated in 0.18 mu m CMOS process occupies 2.24mm(2) active area. Maximum output ripple, overshoot/undershoot and cross regulation are kept below 17mV, 27mV and 0.0432mV/mA, respectively.