US 12,244,217 B2
Power supply circuit and semiconductor integrated circuit including DC-DC converter and regulator
Makoto Morimoto, Yokohama Kanagawa (JP); Rui Ito, Chigasaki Kanagawa (JP); and Ryuichi Fujimoto, Tokyo (JP)
Assigned to Kioxia Corporation, Tokyo (JP)
Filed by Kioxia Corporation, Tokyo (JP)
Filed on Sep. 15, 2021, as Appl. No. 17/475,498.
Claims priority of application No. 2021-044843 (JP), filed on Mar. 18, 2021.
Prior Publication US 2022/0302817 A1, Sep. 22, 2022
Int. Cl. H02M 1/00 (2007.01); H02M 1/14 (2006.01); H02M 3/07 (2006.01)
CPC H02M 1/0045 (2021.05) [H02M 1/14 (2013.01); H02M 3/07 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power supply circuit comprising:
a first node;
a second node;
a DC-DC converter that includes a switched capacitor, configured to generate an output voltage based on an input voltage supplied from the first node, and output the output voltage from the second node;
a regulator that is connected in parallel to the DC-DC converter between the first node and the second node and controls an output current flowing to the second node based on a reference voltage lower than the input voltage;
a switch circuit configured to alternatively select a first operation mode of using both closed-loop control for performing feedback control based on a voltage level of the output voltage on the DC-DC converter and open-loop control for controlling the output current based on the reference voltage without performing the feedback control on the regulator, a second operation mode of performing the closed-loop control on the DC-DC converter and stopping an operation of the regulator, or a third operation mode of performing the closed-loop control on the regulator and stopping an operation of the DC-DC converter; and
a first circuit configured to execute closed-loop control for the DC-DC converter based on a voltage level of the output voltage, wherein
the regulator includes a fourth circuit configured to execute the open-loop control, and
the fourth circuit includes:
a control amplifier configured to output a signal corresponding to a voltage difference between a voltage of a third node in the fourth circuit and the reference voltage;
a first transistor configured to adjust the output current based on an output signal of the control amplifier; and
a second transistor configured to adjust the voltage of the third node based on the output signal of the control amplifier,
wherein the switch circuit is configured to switch whether to execute the closed-loop control on the regulator.