An exact, high-efficiency PFM DC-DC boost converter with dynamic stored energy

Abstract

This paper presents an exact and high-efficiency PFM dc-dc boost converter designed with a standard TSMC 3.3/5 V 0.35-mum CMOS technology. The proposed boost converter utilizes a dynamic stored energy technique to reduce output voltage variation and raise power conversion efficiency. This result is realized using a dynamic stored energy controller and a load current detector that accurately generates different energy according to various load conditions. The output up-ripple voltage variation and steady-state accuracy was 2.6 mV (5.7 mV-8.3 mV) and 0.15% whereas its fixed energy counterpart was 11.1 mV (8.1 mV-19.2 mV) and 0.35%, respectively. The proposed circuit has 6.91% higher power-conversion efficiency than conventional fixed energy technique at a 1 mA current. The maximum power-conversion efficiency is 91.75% for 50 mA output current with a 1.5 V supply.