Design of a PWM multiple switch control and high efficiency current mode DC to DC boost converter for portable devices

For portable electronic products, high efficiency and on-chip integration is preferred. The relatively small size and fewer component used helps reduce power consumption, thus switching frequency is also improved. In order to ensure that the voltage converter can be operated at high frequency, a switching current pulse width modulation is proposed in this paper, with the aim of reducing conduction loss. The circuit can then be adjusted based on the load amount to determine the number of power MOS used. Minimum efficiency at lighter loads can reach up to 80.29% while maximum efficiency is at 87.3%. The output ripple voltage is about 0.464 mV with 4.7 μF off-chip capacitor and 1 μH off-chip inductor. This project was designed and simulated using TSMC´s 0.35micron 2P4M 5V technology with a chip area of 2.88mm².