Smart power management with combined current-feedback low-dropout voltage regulator and switched capacitor DC-DC converter in 180 nm CMOS

摘要

Achieving high efficiency over a wide range of input voltages for digital signal processing modules is a key focus in integrated electronic system applications. This paper proposes a current-feedback low-dropout (LDO) voltage regulator functioning in parallel with a step-down switched capacitor DC-DC converter to implement a smart power management in 180 nm CMOS technology. The proposed switched capacitor DC-DC converter is divided into four cell to reduce the output voltage ripple. The smart power management delivers a 0.71 V power supply with an efficiency as high as 69.4% while maintaining tolerable ripple, and operates over a wide input voltage range of 1.1 V-3.0 V while occupying only 1.5 mm(2). The highest value of ripple is only 14 mV. Measurement results confirm that the proposed implementation achieves a higher efficiency and wider input voltage range than conventional implementations.