Patent ID: 7570039
Filing Date: 2009-08-04
Classification: H02J

Abstract:
1. A circuit for voltage regulation and battery charging, comprising: a voltage regulator circuit, wherein the voltage regulator circuit has at least a feedback input; and wherein the voltage regulator circuit is operable to receive a feedback voltage at the feedback input, and to provide a regulated output voltage based, in part, on the feedback voltage; a battery charger circuit that is arranged to charge a battery, wherein the battery charger circuit is coupled to the voltage regulator circuit; and a voltage tracking circuit having at least an output that is coupled to the feedback input of the voltage regulator circuit, wherein the voltage tracking circuit is operable to receive an amplifier input voltage, and further operable to: if a battery voltage of the battery exceeds the amplifier input voltage, draw current from the feedback node such that the regulated output voltage tracks the battery voltage; and wherein the voltage tracking circuit includes: