Patent ID: 8415927

Claim:
A switch embedded integrated circuit for battery protection, comprising: first, second and third pins; a MOSFET coupled between the first and second pins, the MOSFET having a body diode; a first switch coupled to an anode of the body diode and controlled to couple the anode of the body diode to the first pin or the second pin; a second switch coupled to a cathode of the body diode and controlled to couple the cathode of the body diode to the first pin or the second pin; a control logic circuit coupled to the MOSFET, the first switch and the second switch, operative to control the MOSFET, the first switch and the second switch according to a first detection signal; a first detector coupled to the control logic circuit, the first pin and the third pin, operative to monitor a voltage between the first pin and the third pin to determine the first detection signal; a second detector coupled to the second pin, operative to detect a voltage on the second pin to determine a second detection signal for the control logic circuit to select an over-voltage-protection-release (OVPR) threshold and an over-voltage-protection-release (OVPR) delay time; a current sensor coupled to the control logic circuit and the second pin, operative to generate a current sense signal when detecting a discharge current or a charge current for the control logic circuit to turn on the MOSFET, wherein the current sensor comprises: a current sense resistor coupled in series to the MOSFET; a discharge comparator having a positive input and a negative input coupled to a first terminal and a second terminal of the current sense resistor, respectively, operative to assert the current sense signal responsive to detecting the discharge current flowing through the current sense resistor; and a charge comparator having a positive input and a negative input coupled to the first terminal and the second terminal of the current sense resistor, respectively, operative to assert the current sense signal responsive to detecting the charge current flowing through the current sense resistor.