Battery protection IC and battery device

摘要

Provided are a battery protection IC and a battery device, which are capable of ensuring safety even when a charger is connected in a reverse direction. The battery protection IC includes a first switch element provided between an overcurrent detection terminal and a VDD terminal so that, when the charger is connected with reverse polarity, the first switch element interrupts a current path between the overcurrent detection terminal and the VDD terminal. The battery protection IC further includes a second switch element provided between a charge control terminal and the VDD terminal so that, when the charger is connected with reverse polarity, the second switch element interrupts a current path between the charge control terminal and the VDD terminal.

主权项

1. A battery protection IC for monitoring a voltage and a current of a secondary battery to control charge/discharge of the secondary battery, the battery protection IC comprising:
a VDD terminal and a VSS terminal to be connected to the secondary battery; an overcurrent detection terminal to be connected to an external terminal; a charge control terminal to be connected to a charge control FET for controlling a charge current of a charger for charging the secondary battery; and a first switch element provided in a current path that exists between the overcurrent detection terminal and the VDD terminal, the first switch comprising a first node and a second node, wherein when the first switch is in an on state, current flows between the first node and the second node, wherein, when the charger is connected with reverse polarity, the first switch element switches to an off state and blocks current flow between the first node and the second node, which thereby blocks current flow into the overcurrent detection terminal and out through the VDD terminal.