Battery charge termination voltage reduction

1. An apparatus, comprising:

a charge control circuit configured to be communicatively coupled to an adapter and a charge circuit that includes a charger and a bypass charge circuit that includes a switch having a terminal directly connected to a battery, the charge control circuit configured to receive charging information from the battery, including battery current information, and to control an output current of the adapter, the output current of the adapter coupled to the bypass charge circuit so that while the bypass charge circuit is enabled, the output current bypasses the charger to provide charging power directly from the adapter to the battery through the switch,

wherein the charge control circuit is further configured to:

adjust the received battery current information using a load current that is determined by a difference between a sensed battery current and a current limit of the adapter; and

reduce the output current of the adapter proportionally to the determined load current to prevent a voltage of the battery from exceeding a voltage threshold while the bypass charge circuit is enabled.

2. The apparatus of claim 1 , wherein:

the apparatus is a mobile device; and

wherein the mobile device includes the charge control circuit, and

wherein the adapter is separate from the mobile device, and is configured to receive an alternating current (AC) input and provide a direct current (DC) output.

3. The apparatus of claim 1 , including:

a load current sense element configured to sense the load current,

wherein the charge control circuit is configured to adjust the received battery current information using the sensed load current.

4. The apparatus of claim 1 , wherein the charging information includes battery voltage information, and

wherein the charge control circuit is configured to adjust the received battery voltage information using the load current,

wherein:

the charger is configured to receive an output voltage of the adapter; and

the bypass charge circuit is configured to receive the output voltage of the adapter,

wherein the charger is configured to charge the battery when the adjusted battery voltage information is greater than or equal to a bypass threshold, and

wherein the charge control circuit is configured to control the bypass charge circuit to charge the battery when the adjusted battery voltage information is less than the bypass threshold.

5. The apparatus of claim 1 , wherein the charging information includes battery voltage information, and

wherein the charge control circuit is configured to:

adjust the received battery voltage information using the load current;

control an output current limit of the adapter using the adjusted battery current information; and

control the bypass charge circuit using the adjusted battery voltage information.

6. The apparatus of claim 1 , including:

a current sense resistor configured to sense the battery current information,

wherein the received charging information includes the sensed battery current information.

7. A system to prevent a voltage of a battery from exceeding a voltage threshold, comprising:

an adapter configured to provide an output voltage; and

a mobile device, configured to be coupled to the adapter, including:

a battery;

a charge circuit that includes a charger and a bypass charge circuit that includes a switch having a terminal directly connected to the battery, the bypass charge circuit configured to receive the output voltage of the adapter and, while enabled, to bypass the charger to provide charging power directly from the adapter to the battery through the switch; and

a charge control circuit configured to be communicatively coupled to the adapter and the charge circuit, the charge control circuit configured to receive charging information from the battery, including battery voltage and current information, and to control an output voltage and an output current of the adapter while the bypass charge circuit is enabled,

wherein the charge control circuit is further configured to:

adjust the received battery voltage and current information using a load current that is determined by a difference between a sensed battery current and a current limit of the adapter;

enable the bypass charge circuit to charge the battery when the adjusted battery voltage information is less than a bypass threshold; and

reduce the output current of the adapter proportionally to the determined load current to prevent the voltage of the battery from exceeding the voltage threshold while the bypass charge circuit is enabled.

8. The system of claim 7 , including:

a current sense resistor configured to sense a voltage drop representative of the current of the battery; and

an analog-to-digital converter (ADC) configured to receive battery voltage information and the voltage drop from the current sense resistor,

wherein the received charging information includes information from the ADC.

9. The system of claim 7 , wherein:

the charger is configured to receive the output voltage of the adapter, and to charge the battery when the received battery voltage information is greater than or equal to a bypass threshold.

10. The system of claim 7 , wherein the adapter is separate from the mobile device, and is configured to receive an alternating current (AC) input and provide a direct current (DC) output.

11. The system of claim 7 , including:

a load current sense element configured to sense the load current,

wherein the charge control circuit is configured to adjust the received battery voltage and current information using the sensed load current.

12. A method, comprising:

receiving charging information from a battery, including battery current information, using a charge control circuit configured to be communicatively coupled to an adapter and a charge circuit that includes a charger and a bypass charge circuit that includes a switch having a terminal directly connected to the battery; and

controlling, using the charge control circuit, an output current of the adapter, including:

enabling the bypass charge circuit to bypass the charger and couple the output current of the adapter to the battery to provide charging power directly from the adapter to the battery through the switch;

adjusting the received battery current information using a load current that is determined by a difference between a sensed battery current and a current limit of the adapter; and

reducing the output current of the adapter proportionally to the determined load current to prevent a voltage of the battery from exceeding a voltage threshold while the bypass charge circuit is enabled.

13. The method of claim 12 , the battery, the charge control circuit, and the charge circuit are included in a mobile device and wherein the adapter is separate from the mobile device, the method including:

receiving an alternating current (AC) input at the adapter; and

providing a direct current (DC) output using the adapter.

14. The method of claim 12 , including:

sensing the load current using a load current sense element,

wherein adjusting the received battery current information includes using the sensed load current.

15. The method of claim 12 , wherein receiving charging information includes receiving battery voltage information, wherein the method includes:

adjusting the received battery voltage information using the load current;

receiving an output voltage of the adapter using the charger;

receiving the output voltage of the adapter using the bypass charge circuit;

charging the battery using the charger when the adjusted battery voltage information is greater than or equal to a bypass threshold; and

controlling the bypass charge circuit to charge the battery when the adjusted battery voltage information is less than the bypass threshold.

16. The method of claim 12 , wherein receiving charging information includes receiving battery voltage information, wherein the method includes:

adjusting the received battery voltage information using the load current;

controlling an output current limit of the adapter using the adjusted battery current information; and

controlling the bypass charge circuit using the adjusted battery voltage information.

17. The method of claim 12 , including:

sensing the battery current information using a current sense resistor,

wherein receiving charging information includes receiving the sensed battery current information.