Fully Integrated Low-Ripple Switched-Capacitor DC–DC Converter with Parallel Low-Dropout Regulator

Abstract

In this paper, we propose a fully integrated switched-capacitor DC–DC converter with low ripple and fast transient response for portable low-power electronic devices. The proposed converter reduces the output ripple by filtering the control ripple via combining a low-dropout regulator with a main switched-capacitor DC–DC converter with a four-bit digital capacitance modulation control. In addition, the four-phase interleaved technique applied to the main converter reduces the switching ripple. The proposed converter provides an output voltage ranging from 1.2 to 1.5 V from a 3.3 V supply. Its peak efficiency reaches 73% with ripple voltages below 55 mV over the entire output power range. The transient response time for a load current variation from 100 μA to 50 mA is measured to be 800 ns. Importantly, the converter chip, which is fabricated using 0.13 μm complementary metal–oxide–semiconductor (CMOS) technology, has a size of 2.04 mm2. We believe that our approach can contribute to advancements in power sources for applications such as wearable electronics and the Internet of Things.

Interleaved High Step-Up Current Sharing Converter with Coupled Inductors

“…Although this decreases ripples of input current and increases power level significantly, the switch voltage stress is relatively large and the gain is relatively low. The interleaved parallel DC-DC converter with high set-up is characteristic of high gains, low switch voltage stress, small ripples of input current and high power level under the same duty cycle [15][16][17][18][19]. This kind of converter has several issues.…”

Categorization and Characterization of Time Domain CMOS Temperature Sensors

“…Lastly, as the temperature estimation function of (2) is a function of not only μ(T) and V TH (T) but also V DD , this temperature sensor is necessarily sensitive to the power supply variation. Thus, this temperature sensor should be implemented along with an additional integrated voltage regulator [ 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ] for constant V DD . The measured V DD sensitivity is as large as 1.6 °C/mV with no voltage regulator.…”

Signal Processing and Analysis of Electrical Circuit

“…A low-ripple switched-capacitor DC-DC Converter with parallel low-dropout regulator was proposed. The converter used a four-bit DCpM control and parallel low-dropout regulator [7]. A fuzzy logic system was proposed for the assessment of stator winding short-circuit faults in induction motors.…”