The LP4081B is a fully integrated linear charger solution with power path management targeting single-cell Li-ion battery powered wearable applications. A low onresistance BUS-FET is integrated to manage the input power from a BUS pin. A bidirectional BAT-FET is integrated to manage charging and discharging of the battery. An NTC circuit is offered to manage the temperature range that charging is allowed. A SYS pin delivers power to the system that contains an SoC typically. The LP4081B offers power path management that allows the system to be powered up with a fullydischarged battery. It can dynamically manage the power from the BUS input and the battery to meet the system loading needs. An I2C interface enables programming various parameters of charging, discharging, and multiple protection functions. An interrupt output (IRQb) sends a signal to the SoC when an interrupt event happens so the SoC can take actions accordingly. Multiple features are offerd for the safe operation of the system, including input voltage OVP (over voltage protection), UVLO (under voltage lockout), OTP (over temperature protection), SCP (short circuit protection), system reset, watchdog timer, etc. When powered by a battery, LP4081B can operate with only 0.6-µA currentand this current can be further reduced to 0.4-µA when entering ship mode. The whole system is in a 12-pin 2 X 2 QFN package.