The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2017
Filed:
Aug. 30, 2013
Maxim Integrated Products, Inc., San Jose, CA (US);
Steven Westcott Hawley, Emerald Hills, CA (US);
KyungTak Lee, Seoul, KR;
ChiYoung Kim, Cupertino, CA (US);
Rui Liu, Fremont, CA (US);
Maxim Integrated Products, Inc., San Jose, CA (US);
Abstract
Various embodiments of the invention provide for an adaptive headroom controller circuit that increases the efficiency of switch mode pre-regulator circuits that supply power to multiple linear sub-regulators. Certain embodiments increase efficiency by dynamically modulating the output voltage of the pre-regulator in response to varying headroom voltages requirements, which allows sub-regulators to operate at their individually optimized headroom voltage, thereby, extending battery life and, at the same time, avoiding the triggering of a drop-out condition. In certain embodiments of the invention, further efficiency improvements are provided by selectively operating low drop-out regulators in regulator and load-switch mode. The innovation is applicable to modern mobile PMIC switching pre-regulator architectures (e.g., buck, buck/boost, or boost type) powered by a single high-voltage Li-ion battery and followed by a group of low drop-out type sub-regulators that share a common, pre-regulated low voltage input that drives multiple low-voltage outputs.