Battery protection integrated circuit applied to battery charging/discharging system and method for determining resistances of voltage divider of battery protection integrated circuit

A battery protection integrated circuit applied to a battery discharging system, wherein the battery discharging system comprises a load and a switch, the load is connected to a battery when the battery is put into the battery discharging system, the switch is utilized for selectively allowing the battery to discharge, and the battery protection integrated circuit comprises:

• a voltage divider, coupled to a first node of the switch, for dividing a voltage of the first node of the switch to generate a divided voltage, wherein the voltage divider comprises a first fuse resistor and a second fuse resistor, the first fuse resistor is a laser fuse, and the second fuse resistor is an electrical fuse, and wherein a fuse trimming operation is performed upon the first and second fuse resistors to make the resistances meet a discharge threshold requirement of the battery;
• a comparator, coupled to the voltage divider, for comparing the voltage of the first node of the switch with a reference voltage to generate a comparison result;
• and
• a controller, coupled to the comparator, for generating a control signal according to the comparison result, wherein the control signal is utilized for switching on or switching off the switch.

A method for determining resistances of a voltage divider of a battery protection integrated circuit, comprising:

• performing a first fuse trimming operation upon the resistors of the voltage divider;
• determining whether the resistances of the resistors of the voltage divider satisfy a rule;
• and
• when the resistances of the voltage divider do not satisfy the rule after the first fuse trimming operation, performing a second fuse trimming operation upon the resistors of the voltage divider;
• wherein the first fuse trimming operation is a laser fuse trimming operation, and the second fuse trimming operation is an electrical fuse trimming operation.