Power Management

Nan Hua University, Hsinchu, Taiwan 1 The calibration process of the ACC technique is described by the flow chart in Fig. 12.7.3. When ACC detects that LEDs are all on, the output voltage is sensed and defined as VOt. Le

causes a large output voltage undershoot ΔVUS and long settling time ts if the transient responses are slow [1]. Since the output capacitor current ICo instantly reflects ΔIload, transient response optimization for minim

Wide input rails (12V to 100V) are common in today’s automotive and industrial systems. Miniaturized DC-DC voltage regulators (VRs), which can provide a lowvoltage regulated output from a wide input range and deliver a f

In recent years, significant progress has been made on switched-capacitor DC-DC converters as they enable fully integrated on-chip power management. New converter topologies overcame the fixed input-to-output voltage lim

Switched-capacitor (SC) DC-DC converters have gained attention based on their ability to offer a low-cost high-efficiency power conversion, and allow a thin and compact module packaging [1]. However, the SC DC-DC convert

In recent years, there has been an ever-increasing interest in monolithic power supplies. Integrating the power supply with the application has many direct benefits, including a reduction of the bill of materials and red

Switched-capacitor (SC) DC-DC converters have several advantages over inductive DC-DC converters in that they are easily integrated on-chip and can scale to desired power levels, rendering themselves promising for integr

Energy harvesting (EH) can be used in wireless sensor networks (WSNs) since the sensors can be powered by ambient energy in conjunction with rechargeable batteries to achieve near-perpetual operation [1-4]. One common so

Stefano Stanzione1, Chris van Liempd1, Misato Nabeto2, Firat Refet Yazicioglu3, Chris Van Hoof1,4 Holst Centre / imec, Eindhoven, The Netherlands, OMRON, Kizugawa, Japan, 3imec, Heverlee, Belgium, 4 KU Leuven, Leuven, Be

Compared with inductive DC-DC boost converters [1], the charge pump (CP) features no off-chip inductors and is suitable for monolithic low power energy harvesting applications such as Internet of Things (IoT) smart nodes

energy harvester (EMH) is an electromechanical mass-spring-damper system transducing electrical energy out of ambient vibrations. Resistive load matching [1] as well as maximum power point (MPP) AC-DC conversion [2] are

near-threshold regions minimizes dynamic power consumption and achieves better efficiency [1]. This technique is widely used in energy-efficient applications, and is especially beneficial for wirelessly powered devices s

Sai-Weng Sin2, Seng-Pan U2,3, R. P. Martins2,4 Hong Kong University of Science and Technology, Hong Kong, China, University of Macau, Macao, China, 3Synopsys, Macao, China, 4 Instituto Superior Tecnico, Universidade de L

Thomas Toifl1, Christian Menolfi1, Lukas Kull1, Thomas Morf1, Marcel Kossel1, Matthias Brändli1, Pier Andrea Francese1 IBM Research, Rüschlikon, Switzerland, 2ETH Zürich, Zürich, Switzerland 1 On-chip (or fully integrate

Switched-capacitor (SC) converters have shown significant promise for monolithic integration in a variety of mobile computing applications due to the relatively high energy-densities of modern capacitor technologies and

Photovoltaic energy harvesting is an attractive method of developing battery-free systems for wireless sensors, biomedical electronics, and the internet of things (IoT). To obtain an energy-efficient system, low-power di

a very large voltage conversion ratio since the rectified US and EU mains have DC levels of 169V and 325V, respectively. Primary converters, such as flyback converters, use the winding ratio of the isolation transformer

of Technology, Atlanta, GA 1 3 Wireless power transfer (WPT) systems are becoming ubiquitous with applications in powering medical implants and a range of portable consumer electronic devices such as smart phones and wea

Wireless power transfer (WPT) in the range of 10 to 100mW [1] is widely used in implantable medical devices (IMDs) to eliminate the use of a battery. Due to load and coupling variations, the output voltage of the rectifi

Georgia Institute of Technology, Atlanta, GA 1 2 A wide variety of applications can benefit from near-field wireless power transfer using coupled inductive links, such as wireless sensors and implantable microelectronic

Shin-Hao Chen1, Ting-Jung Lo1, Ke-Horng Chen1, Chin-Long Wey1, Ying-Hsi Lin2, Chao-Cheng Lee2, Jian-Ru Lin2, Tsung-Yen Tsai2 National Chiao Tung University, Hsinchu, Taiwan, Realtek Semiconductor, Hsinchu, Taiwan 1 2 Sin

very important issue for Power-Management ICs (PMICs). Single-Inductor Multiple-Output (SIMO) converters are excellent candidates to meet this requirement [1-3]. However, there are several issues with SIMO converters, su

semiconductor-based systems. It is expected that solid-state lighting (SSL) will dominate general lighting in the near future. Two main challenges that must be met in SSL are the reduction of the bill of materials (BOM),

Implantable biomedical systems usually operate in energy-limited environments and exhibit large variation of power consumption ranging from constant lowpower (bio-signal sensing) to sporadic high-power (stimulation and/o

in terms of high output power, low ripple, fast load transient response, high efficiency across a very wide range of load currents, and alleviated output filter requirements. However, the need for complex controllers tha

to integrate more DC-DC converters into the power-management IC. Consequently, there is a growing need for an area-efficient and simple controller design for DC-DC converters. A simple hysteretic control without any addi

In this paper, a 3-phase switched-capacitor (SC) boost converter that uses 2 external floating capacitors to provide 16V output from a 3.3V input is presented. It achieves an efficiency of 70.3% at 7mA load current while

Thomas Toifl2, Christian Menolfi2, Lukas Kull2, Thomas Morf2, Marcel Kossel2, Matthias Brändli2, Peter Buchmann2, Pier Andrea Francese2 ETH, Zurich, Switzerland, 2IBM Research, Rüschlikon, Switzerland 1 For an on-chip or

The growing demand for both performance and battery life in portable consumer electronics requires SoCs and power management circuits to be small, efficient, and dynamically powerful. Dynamic voltage scaling (DVS) can he

There is an increasing need for fully integrated power converters to reduce form factor in mobile devices and provide high-density point-of-load power delivery in performance computing applications [1]. While the number

Dynamic voltage scaling (DVS) is an effective strategy in reducing the power consumption of a processor through adjusting its supply voltage at runtime. The power converter that drives the processor should have a wide ou

Improving battery longevity in portable devices usually requires the use of different voltage levels with a wide range of load capability for various functional blocks. Since a single-inductor-multiple-output (SIMO) conv

In recent years, the clock frequency, the number of cores, and the power dissipation of application processors (APs) for portable electronics have dramatically increased. As a result, peak processor currents have reached

wide range of load current, especially for today’s multicore SoCs, which usually have a wide range of current profile. Active-phase-count (APC) control, as proposed in [1-3], is the key technique that offers the wide loa

University of California, Los Angeles, CA, 2SiTime, Sunnyvale, CA now with Altera, San Jose, CA 1 * Recent advances in MEMS-based oscillators have resulted in their proliferation in timing applications that were once exc

Energy harvesting is a key technology in various small-size applications such as wireless sensor nodes, mobile devices, and implantable bio-devices to improve battery lifetime or to substitute for batteries. Piezoelectri

and remote monitoring stations can be self-powered by solar panels (SPs) having output powers of tens of watts. When the size of the SP is large, part of it can be shaded by birds, trees and other objects resulting in pa

Si Duk Sung, Tae-Hwang Kong, Sung-Wan Hong, Jun-Han Choi, Min-Yong Jeong, Jong-Pil Im, Seung-Tak Ryu, Gyu-Hyeong Cho KAIST, Daejeon, Korea Energy harvesting is one of the key technologies used to realize self-sustaining

zero to 30mA. Afterwards, SES and SE open and SDE and SO close to drain LO into vO. SDE then opens and, if GHV senses that vO still needs power, vSAW starts ramping and SPE closes to energize LO from vPS to vO. When vSAW

mm-scale wireless systems

Konstantina M. Stankovic3,4, Anantha P. Chandrakasan1 Massachusetts Institute of Technology, Cambridge, MA, University of California, San Diego, La Jolla, CA, 3 Massachusetts Eye and Ear Infirmary, Boston, MA, 4 Massachu

Korea University, Seoul, Korea 1 2 Design of low-voltage and efficient energy-harvesting circuits is becoming increasingly important, particularly, for autonomous systems. Since the amount of energy that can be harvested

Light-emitting diodes (LEDs) are widely used in general lightings due to their several advantages including high efficiency, high reliability, long life, and environmental friendliness. Recently, various converter-free m

Dynamic Voltage Scaling (DVS) has become one of the standard techniques for energy efficient operation of systems by powering circuit blocks at the minimum voltage that meets the desired performance [1]. Switched Capacit

Lithium-ion batteries are the dominant power source in mobile devices. However, while the supply voltage required for processors and SoCs has scaled down to ~1V, the voltage range of this popular battery remains ~2.9V-4.

University of Michigan, Ann Arbor, MI Ultra-low power microsystems are gaining more popularity due to their applicability in critical areas of societal need. Power management in these microsystems is a major challenge as

LEDs, the lighting industry is expected to see a significant growth in the near future. However, for LEDs to completely replace the traditional incandescent and CFL bulbs, the power converters within the LED drivers need

2 University of California, San Diego, La Jolla, CA, Brown University, Providence, RI 1 2 Envelope Tracking (ET) is an efficiency enhancement technique where the power supply of a linear RF power amplifier (PA) follows t

because of the fundamental correlation between data rate and transmit power. Furthermore, the high peak-to-average power ratio (PAPR) of the modulated signals causes a degradation in PA efficiency, since the supply volta

Multi-phase converters have become a topic of great interest due to the high output power capacity and output ripple cancellation effect. They are even more beneficial to nowadays high-frequency fully integrated converte