US 12,476,540 B2
Single-inductor multi-output (SIMO) direct current to direct current (DC-DC) buck converter
Wen-Hau Yang, Hsinchu (TW); Yen-Ting Lin, Hsinchu (TW); Chun-Yu Luo, Hsinchu (TW); Shih-Chieh Chen, Hsinchu (TW); and Hung-Hsuan Cheng, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed on Mar. 20, 2024, as Appl. No. 18/610,307.
Claims priority of application No. 112111964 (TW), filed on Mar. 29, 2023.
Prior Publication US 2024/0333155 A1, Oct. 3, 2024
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/009 (2021.05); H02M 3/1582 (2013.01); H02M 3/1584 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A single-inductor multi-output (SIMO) direct current to direct current (DC-DC) buck converter, comprising:
a first switch having a first terminal and a second terminal, wherein the first terminal receives an input signal;
a second switch having a third terminal and a fourth terminal, wherein the third terminal is coupled to the second terminal, and the fourth terminal is coupled to a reference voltage;
a third switch having a fifth terminal and a sixth terminal, wherein the sixth terminal outputs a first voltage;
a fourth switch having a seventh terminal and an eighth terminal, wherein the eighth terminal outputs a second voltage;
an inductor having a ninth terminal and a tenth terminal, wherein the ninth terminal is coupled to the second terminal and the third terminal, and the tenth terminal is coupled to the fifth terminal and the seventh terminal;
an error amplifier circuit configured to generate a first error signal and a second error signal according to the first voltage and the second voltage respectively;
an inductor current ripple emulator circuit coupled to the inductor and configured to generate a sensed voltage according to a first terminal voltage at the ninth terminal and a second terminal voltage at the tenth terminal of the inductor;
a comparison circuit coupled to the error amplifier circuit and the inductor current ripple emulator circuit and configured to generate a first comparison result and a second comparison result according to the first error signal, the second error signal, and the sensed voltage; and
a control circuit coupled to the comparison circuit and configured to generate, according to the first comparison result and the second comparison result, a first control signal, a second control signal, a third control signal, and a fourth control signal that are used to control the first switch, the second switch, the third switch, and the fourth switch respectively.