US 12,034,370 B2
Power converter with overdrive switch control
Sujan K. Manohar, Austin, TX (US); and Jay B. Fletcher, Saratoga, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 15, 2022, as Appl. No. 17/651,173.
Prior Publication US 2023/0261573 A1, Aug. 17, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/088 (2006.01); H02M 3/07 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/088 (2013.01); H02M 3/07 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a switch circuit that includes a high-side switch coupled between an input power supply node and a switch node, and a low-side switch coupled between the switch node and a ground supply node, wherein the switch node is coupled to a regulated power supply node via an inductor, and wherein the high-side switch is configured to couple the switch node to the input power supply node during an active time period; and
a control circuit configured to:
monitor a voltage level of the input power supply node; and
decrease, during the active time period, an on-resistance of the high-side switch in response to a determination that the voltage level of the input power supply node is less than a threshold value, wherein, in decreasing the on-resistance of the high-side switch, the control circuit is configured to change a gate-source voltage of the high-side switch independent of changing a drain-source voltage of the high-side switch.