A 0.791mm2 fully on-chip controller with self-error-correction for boost DC-DC converter based on Zero-Order Control

Abstract

This paper introduces an on-chip controller without off-chip components to reduce controller size for use as a Zero-Order-Control converter (ZOC). DC offset error by adding sawtooth signal in ZOC is self-corrected using a new control scheme, so as to overcome weak point of ZOC. This controller is applicable to both buck and boost, but a boost converter is chosen for verification here. A 0.35μm BCD process is used for chip with controller area of 0.791mm2. An efficiency of 90% is obtained for an 8 V output from 3.7 V at 480mW with 926 KHz.