The novel Switched-Capacitor DC-DC converter for fast response time and reduced ripple

A novel voltage regulation scheme to control the number of multi-phase and frequency for Switched-Capacitor(SC) DC-DC converters is presented. The controller adjusts the number of interleaved phases with the size of switches. In addition, switching frequency of SC DC-DC converter is increased to reduce output ripple voltage when output load current is low. 16 phase 2:1 SC DC-DC converter is designed in 45 nm standard CMOS process using the proposed scheme. The converter with new control technique achieves fast response and low Vout ripple under fast varying currents. Maximum output voltage ripple(Vripple) is less than 15 mV and maximum response time is less than 0.2 us with 4 mA. Normal Vripple is less than 2 mV.