FRONT END CHARGER BYPASS SWITCH WITH LINEAR REGULATION FUNCTION AND PATH FOR REVERSE BOOST

摘要

Methods, apparatuses, and systems may provide for regulating the system voltage in a mobile device by utilizing a bypass switch as a linear control circuit. A second switch is connected an output of a first switch and to a voltage control circuit. The linear control circuit detects a system voltage and compares the detected system voltage to a reference voltage. The linear control circuit will fully turn on the second switch when the system voltage is below the voltage threshold set by the reference voltage. However, when the system voltage exceeds the set voltage threshold, the second switch will automatically clamp the system voltage to remain at the voltage that is set by reference voltage.

主权项

1. An apparatus comprising:
a first switch coupled to an input node; a second switch coupled to the first switch and to an output node; a power supply port connected to the input node; a charger having a first charge port, and a second charge port to couple the charger to the first switch and the second switch; and a control circuit coupled to the first switch, the second switch, and the output node, the control circuit to activate the second switch when a system voltage detected at the output node is less than a threshold voltage, and to control the second switch to maintain the system voltage at the threshold voltage when the system voltage exceeds the threshold voltage, wherein the control circuit includes a resistance divider and an error amplifier.