The NCP1871 is a NVDC switching battery charger designed for 2−3−4 battery cell applications such as ultra books or tablets. It is optimized for use with the mobile computing chipsets, and is also compatible with most mobile solutions.The NCP1871 is designed around a full NMOS DC to DC controller that brings down the high voltage charger adapter voltage to a regulated system supply that is in the same range as the battery pack voltage. This limits the variation on the system supply voltage, and improves the efficiency of the core converters. The device includes a voltage droop monitor, charger adapter validation and blocking as well as an intelligent battery connection control. The adapter current, charge current and system current are closely monitored and an image is provided to the host. The NCP1871 is fully programmable through an I2C friendly SMBus Interface.

• SMBus host-controlled NVDC-1 2S-4S battery charge controller
• Instant-on works with no battery or deeply discharged battery
• Automatic supplement mode with BATFET control
• Battery Removal Sensor
• Programmable Charge Current, Charge Voltage, Input Current Limit with Interrupt Management- ±0.5% Charge Voltage Regulation up to 18.08V- ±3% Input/Charge Current Regulation up to 8.064A
• Support battery LEARN function
• Support Shipping Mode and Hard System Reset
• Ultra-Low Quiescent Current of 10 μA and High PFM Light Load Efficiency 80% at 20mA load to Meet Energy Star and ErP Lot6
• Full NMOS solution
• Current and Power Monitoring
• Programmable switching frequency
• SMBUS clock up to 400kHz (I2C friendly)