Patent · US Active

High current, low dropout driver circuit

US12273977B2 · kind B2 · utility

0Cited by

3References

20Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Cristian Grecu · Munich, DE
Nicola Rasera · Munich, DE
Bogdan-Eugen Matei · Westerndorf, DE
Fabio Ongaro · Munich, DE

Key dates

Filing date	Jun 21, 2023
Grant date	Apr 8, 2025
Priority date	—
Expiry date	Jul 8, 2043

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/46
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A high current, low dropout driver circuit is disclosed. The circuit includes a decoder configured to decode a plurality of control bits to generate a plurality of control signals, and a current source having a plurality of devices. The current source is configured to activate at least a subset of the plurality of devices using the control signals to provide a load current to a load circuit, such as a light-emitting diode (LED), using activated ones of the plurality of devices and a control voltage. A control circuit is configured to generate the control voltage based on the load current and a reference current.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.