BD71631QWZ Linear Charger ROHM Semiconductor BD71631QWZ Linear Charger is optimized for charging low-voltage batteries and single-cell li-ion batteries. The BD71631QWZ accepts a power supply input range of 2.9V to 5.5V and generates a charging battery voltage ranging from 2.0V to 4.7V. The device integrates an open-drain charge indicator LED output and a Negative Temperature Coefficient (NTC) thermistor input for temperature qualified charging. The battery charge voltage, charge current, and termination current can all be set using external resistors. Safety functions include a built-in fixed 10-hour safety timer, UVLO (under-voltage lockout), TSD (thermal shutdown detection), and battery over-voltage protection.