US 12,093,098 B2
USB power delivery interface
Christophe Lorin, Montbonnot (FR); and Nathalie Ballot, Sassenage (FR)
Assigned to STMicroelectronics (Grenoble 2) SAS, Grenoble (FR)
Filed by STMicroelectronics (Grenoble 2) SAS, Grenoble (FR)
Filed on Jan. 5, 2022, as Appl. No. 17/647,125.
Claims priority of application No. 2100894 (FR), filed on Jan. 29, 2021.
Prior Publication US 2022/0244770 A1, Aug. 4, 2022
Int. Cl. G06F 1/26 (2006.01); G06F 13/40 (2006.01)
CPC G06F 1/266 (2013.01) [G06F 13/4068 (2013.01); G06F 2213/0042 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A universal serial bus (USB) power delivery (PD)-type interface comprising:
a first node configured to receive a first power supply potential, a second node configured to deliver a second power supply potential, and a third node configured to be at a reference potential;
a first resistor coupled between a fourth node coupled to the first node, and a fifth node;
a first metal-oxide-semiconductor (MOS) transistor coupled between the fifth node and the second node;
a bipolar transistor having a collector coupled to a gate of the first MOS transistor and an emitter coupled to the fourth node or the fifth node; and
a first circuit configured to deliver a control potential to a base of the bipolar transistor determined from a current in the first resistor, the first circuit comprising an operational amplifier having a first input coupled to the fourth node, a second input coupled to the fifth node, an output coupled to the base of the bipolar transistor, and a diode and a second resistor in series between the fourth node or the fifth node and the third node, a node of connection of the diode and of the second resistor being configured to deliver a floating ground to the operational amplifier, a gain of the operational amplifier being variable and determined by the first power supply potential.