公开(公告)号：US20250132680A1

公开(公告)日：2025-04-24

申请号：US18625511

申请日：2024-04-03

Applicant: Richtek Technology Corporation

Inventor： Tung-Hang Liu ,  Chi-Jen Yang ,  Chun-Jen Yu ,  Tsung-Han Yu

IPC: H02M3/158 ,  H02M1/00

Abstract: A buck-boost switching power circuit comprises a bypass control circuit which configured to determine whether the buck-boost switching power circuit operates in a bypass mode according to a bypass enable signal. When the conversion voltage difference between the input voltage and the output voltage is less than a reference voltage, the bypass control circuit controls to electrically connect the input power source with the output power source, and operates the buck-boost switching power circuit in the bypass phase of the bypass mode. Before and/or after the bypass phase, the bypass control circuit respectively controls the buck-boost switching power circuit to operate in a first transition phase and/or a second transition phase. During the first transition phase or the second transition phase, the bypass control circuit controls the output voltage to gradually change towards the input voltage or target voltage, until the conversion voltage difference is less than the first reference voltage or the output voltage equals the target voltage.