US 12,273,977 B2
High current, low dropout driver circuit
Cristian Grecu, Landshut (DE); Nicola Rasera, Munich (DE); Bogdan-Eugen Matei, Bavaria-Bayern (DE); and Fabio Ongaro, Unterhaching (DE)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 21, 2023, as Appl. No. 18/338,916.
Prior Publication US 2024/0431001 A1, Dec. 26, 2024
Int. Cl. H05B 45/30 (2020.01); G05F 1/575 (2006.01); H03M 7/16 (2006.01); H05B 45/34 (2020.01); H05B 45/397 (2020.01)
CPC H05B 45/397 (2020.01) [G05F 1/575 (2013.01); H03M 7/165 (2013.01); H05B 45/34 (2020.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a decoder configured to decode a plurality of bits to generate a plurality of control signals;
a current source including a plurality of devices, wherein the current source is configured to:
activate at least a subset of the plurality of devices using the plurality of control signals; and
provide a load current to a light-emitting diode (LED) using activated ones of the plurality of devices and a control voltage; and
a control circuit configured to generate the control voltage based on the load current and a reference current.