US 12,395,082 B2
Switching regulator with quick start circuit configured to charge and discharge a capacitor to control a power mode
Jang Hyuck Lee, Sungnam-si (KR); and Seongnam Kim, Namyangju-si (KR)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Jul. 13, 2023, as Appl. No. 18/351,872.
Prior Publication US 2025/0023475 A1, Jan. 16, 2025
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2007.01); H02M 1/088 (2006.01); H02M 1/36 (2007.01)
CPC H02M 3/1584 (2013.01) [H02M 1/0025 (2021.05); H02M 1/088 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A switching regulator circuit, comprising:
a power supply input;
a voltage reference;
a power output;
a high-side switch coupled between the power supply input and the power output;
a low-side switch coupled between a ground reference and the power output;
a driver circuit coupled to the high-side switch and the low-side switch;
a low-power comparator coupled to receive the voltage reference and the power output;
a high-power comparator having a first input and a second input;
wherein the first input is coupled to a compensation capacitor and a first switch;
wherein the second input is coupled to a current sense ramp;
wherein the current sense ramp is coupled to the power output;
wherein the first switch is coupled to an error amplifier; and
wherein the error amplifier is coupled to receive the voltage reference and the power output;
a second switch coupled to the low-power comparator, the high-power comparator, and the driver circuit;
a controller coupled to the first switch and the second switch;
wherein the controller is configured to control the first switch and the second switch to place the switching regulator circuit in either a high-power mode or a low-power mode.