公开(公告)号：US11665800B2

公开(公告)日：2023-05-30

申请号：US17552507

申请日：2021-12-16

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan ,  Gregory Michael Fattig ,  Ramesh Selvaraj ,  Ron Vincent Ocampo

IPC: H05B45/30 ,  H05B45/375 ,  H05B45/38

CPC classification number: H05B45/375 ,  H05B45/38

Abstract: Described herein are systems and methods for operating DC-DC regulators such as LED drivers. Various embodiments herein allow a DC-DC regulator to switch between buck mode and buck-boost mode without suffering effects otherwise resulting from transient currents when switching between modes. In certain embodiments, this is accomplished by operating the DC-DC regulator in a buck-boost mode to charge a boost capacitor with a substantially constant inductor current. The inductor current is also used to control a set of switches to operate the DC-DC regulator in a buck mode to drive a load by using the capacitor as a power source.