TS2207A/B

The TS2207A/B series are protection ICs design to safe guard one-cell Lithium-ion battery pack against over  charge/discharge, over current and short circuit. The TS2207A/B series use advanced high voltage CMOS process to  provide high accuracy voltage detection and low current consumption.

The TS2207A/B series incorporate a reference unit and three voltage detectors. During charging process, when the cell voltage(V_DD) is charged to a value higher than the over-charge threshold voltage (V_C1), the over charge detector (COM1)  will switch the output pin (COUT) to a low  level within a delay time (t_C1), and thus turning off the MOSFET connected to the charging path. The COUT pin may change to high level again when the V_DD voltage falls below "V_C1-V_HYS", or when VDD alls below V_C1 while the charger is disconnected from the battery pack.  

During the discharging process, when the V_DD voltage of the TS2207A/B drops to a value lower than the over-discharge threshold voltage V_D1),  the over-discharge detector (COM2) will switch DOUT to low level within a delay time (t_D1), and thus turning off the MOSFET connecting the discharging path. In the mean time, the TS2207A/B series will enter a low current standby  mode. Once into standby mode, the system can only be released from standby mode right after the battery pack is  connected to a charger.  

The conditions of over current and short circuit protection of the TS2207A/B are both determined by the voltage at the V- pin. As the voltage of V- pin reaches a higher value than V_OC, which indicates an undesirable large current is flowing through the path, DOUT will be switched to a low level and the path is cutoff after internally pre-set delay time (t_OC) elapses. In the case of short  circuit, i.e. V- rises above VSHORT, the path will also be cutoff but with almost no delay time. Once the over current or  actors contributing to short circuit is removed, the built-in resistor at the V- _pin, typically 100kΩ, will pull V- down to V_SS and bringing the IC back to normal operation.  

Together with the application circuit, the TS2207A/B will function as a consummate protector, which promotes safe usage and the sustainability of Li-ion battery packs.