Patent ID: 8450976

Claim:
A system comprising: control circuitry configured to detect a current wherein the detected current is a battery discharge current or a battery charging current; a first transistor, coupled to the control circuitry, configured to disconnect a load from at least one of a battery and a DC/DC converter if the battery discharge current exceeds a maximum battery discharge current setting; a second transistor, coupled to the control circuitry, configured to connect the battery to the DC/DC converter and adjust the battery charging current to maintain the battery charging current at or near a charge current setting; and a third transistor, coupled to the second transistor and the control circuitry, configured to maintain a connection between the battery and the DC/DC converter if the control circuitry is unable to function, wherein a drain of the third transistor is coupled to a gate of the second transistor so that a gate voltage of the second transistor is adjusted in response to a gate voltage of the third transistor.