A Ramp Integrating Capacitor Current Constant On-time (RICCCOT) Controlled Buck Converter with High Noise Immunity in DCM
Journal
2024 IEEE Applied Power Electronics Conference and Exposition (APEC)
Part Of
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Start Page
2144
End Page
2147
ISBN (of the container)
979-835031664-3
Date Issued
2024-02-25
Author(s)
Abstract
This paper proposes a ramp integrating capacitor current mode constant on-time (RICCCOT) controlled buck converter. A capacitor current-controlled modulation scheme ensures an ultra-fast load transient response. However, this scheme suffers from sensing circuit mismatch-induced instability, hence an integrated ramp is proposed to mitigate the problem. Moreover, the proposed integrated ramp improves noise immunity and provides accurate trigger in discontinuous-conduction mode (DCM). Implemented in a 28nm CMOS process with a 5-MHz high switching frequency, this circuit occupies a total area of 605 μm by 431 μm in width and length. Finally, the chip simulation results show a fast load transient response, which is 48mV voltage drop and 1μs response time under the conditions of 1.1V output voltage and 0.9A load step-up with 0.9A/1ns slew rate.
Event(s)
2024 39th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2024
SDGs
Publisher
IEEE
Type
conference paper