A Reconfigurable Switched Capacitor DC–DC Converter With 1.9–6.3-V Input Voltage Range and 85% Peak Efficiency in 28-nm CMOS

This paper presents circuit topologies and implementations for SC DC-DC converters with controlled charging current. It focuses on the power current mirror that regulates the charging current of the flying capacitor and on the switch drivers. The bandwidth and transient response of the power mirror are improved by inserting an auxiliary current mirror in its input signal path. Conventional switch drivers need power supplies with fast response to load transients; the driver presented here is less demanding, as only its core is biased internally, while the output stage is supplied directly by the converter input voltage. The circuit has an additional "Linear Regulator" mode of operation, whereby the power mirror is turned into a pass transistor. This expands the low-end limit of the converter input voltage. These solutions were used to design in a 130nm BCD technology an automotive SC DC-DC converter. Simulations and measurements performed over the entire automotive temperature range (−40C to +150C), for supply voltages between 8V and 28V, demonstrate that the converter meets all requirements: it can operate with output capacitors as small as 1µF; it provides regulated 5V output voltage for load currents up to 200mA, ensuring a low output voltage ripple, of 35mV and 9mV for output capacitors of 1µF and 10µF, respectively; its efficiency peaks at 81.3% for the typical battery voltage level, 12V.

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“…The measurements presented in Figs. [21][22][23] are in line with the corresponding simulation results.…”

Section: Silicon Implementation and Measurement Resultssupporting

confidence: 81%

“…Most of the converters chosen for this comparison regulate the output voltage by controlling the charging current of CFLY, similarly to the proposed converter. Two papers with regulation based on Pulse Frequency Modulation (PFM), were also included, [21] & [22].…”

Section: A Comparison With State-of-the-artmentioning

confidence: 99%

Automotive Switched-Capacitor DC–DC Converter With High BW Power Mirror and Dual Supply Driver

Răducan

Bajenaru

2022

IEEE Trans. Circuits Syst. I

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A 13.56 MHz reconfigurable step-up switched capacitor converter for wireless power transfer system in implantable medical devices

Kim

Marin

Seo

et al. 2022

Analog Integr Circ Sig Process

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A 2-8V V_in 670mA Scalable Multi-Ratio SC DCDC Converter for MCU Integration in 28nm CMOS Achieving 91% Peak Efficiency

Gehl,

Cherniak,

Kharko

et al. 2023

ESSCIRC 2023- IEEE 49th European Solid State Circuits Conference (ESSCIRC)

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A Reconfigurable Switched Capacitor DC–DC Converter With 1.9–6.3-V Input Voltage Range and 85% Peak Efficiency in 28-nm CMOS

Cited by 5 publications

References 9 publications

Automotive Switched-Capacitor DC–DC Converter With High BW Power Mirror and Dual Supply Driver

Automotive Switched-Capacitor DC–DC Converter With High BW Power Mirror and Dual Supply Driver

A 13.56 MHz reconfigurable step-up switched capacitor converter for wireless power transfer system in implantable medical devices

A 2-8V V_in 670mA Scalable Multi-Ratio SC DCDC Converter for MCU Integration in 28nm CMOS Achieving 91% Peak Efficiency

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A Reconfigurable Switched Capacitor DC–DC Converter With 1.9–6.3-V Input Voltage Range and 85% Peak Efficiency in 28-nm CMOS

Cited by 5 publications

References 9 publications

Automotive Switched-Capacitor DC–DC Converter With High BW Power Mirror and Dual Supply Driver

Automotive Switched-Capacitor DC–DC Converter With High BW Power Mirror and Dual Supply Driver

A 13.56 MHz reconfigurable step-up switched capacitor converter for wireless power transfer system in implantable medical devices

A 2-8V Vin 670mA Scalable Multi-Ratio SC DCDC Converter for MCU Integration in 28nm CMOS Achieving 91% Peak Efficiency

Contact Info

Product

Resources

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A 2-8V V_in 670mA Scalable Multi-Ratio SC DCDC Converter for MCU Integration in 28nm CMOS Achieving 91% Peak Efficiency