Load power supply circuit and terminal

A terminal, comprising:

• a load;
• a load power supply circuit that comprises a charging manager and a step-up circuit;
• a battery that supplies power to the load by using the load power supply circuit;
• the charging manager is integrated into a single circuit chip and comprises a first pin, a second pin, a third pin, a logic control circuit, and a switch element, wherein:
• the first pin of the charging manager is electrically connected to the load and the second pin of the charging manager is electrically connected to the battery;
• the logic control circuit comprises a first output end and a second output end;
• the switch element is a metal insulator semiconductor (MOS) transistor that comprises a first end, a second end, and a control end, wherein a gate of the MOS transistor is the control end of the switch element, a source of the MOS transistor is the second end of the switch element, and a drain of the MOS transistor is the first end of the switch element;
• the first end of the switch element is electrically connected to the first pin of the charging manager, the second end of the switch element is electrically connected to the second pin of the charging manager, and the control end of the switch element is electrically connected to the first output end of the logic control circuit;
• and
• the second output end of the logic control circuit is electrically connected to the third pin of the charging manager;
• and
• the step-up circuit comprises a first end, a second end, and a control end, the first end of the step-up circuit is electrically connected to the load, the second end of the step-up circuit is electrically connected to the battery, and the control end of the step-up circuit is electrically connected to the third pin of the charging manager;
• wherein:
• when the charging manager is not electrically connected to an external power supply and when a voltage of the battery is greater than a first threshold, the logic control circuit controls the control end of the switch element to connect the first end and the second end of the switch element, the logic control circuit controls the control end of the step-up circuit to disconnect the step-up circuit, and the battery supplies power to the load by using the switch element in the charging manager;
• when the charging manager is not electrically connected to the external power supply and when the voltage of the battery is less than a second threshold, the logic control circuit controls the control end of the switch element to disconnect the first end and the second end of the switch element, the logic control circuit controls the control end of the step-up circuit to connect the step-up circuit, and the battery supplies power to the load by using the step-up circuit, wherein the second threshold is less than or equal to the first threshold;
• and
• the step-up circuit and the switch element of the charging manager are electrically connected in parallel.