深圳市中立信电子科技有限公司

1 Features

1• Increases System Operation Time Between

Charges

– Configurable 300-mA Buck Regulator

(1.8-V Default)

– 700 nA (typical) Iq with Buck Converter

Enabled (No Load)

– Configurable Load Switch or 100mA LDO

Output (Load Switch by Default)

– Up to 300-mA Charge Current for Fast

Charging

– 0.5% Accurate Battery Voltage Regulation

(Configurable from 3.6 V to 4.65 V in 10-mV

Steps)

– Configurable Termination Current Down to

500 μA

– Simple Voltage Based Battery Monitor

2 Applications

• Smart Watches and other Wearable Devices

• Fitness Accessories

• Health Monitoring Medical Accessories

• Rechargeable Toys

3 Description

The bq25120A is a highly integrated battery charge

management IC that integrates the most common

functions for wearable devices: Linear charger,

regulated output, load switch, manual reset with

timer, and battery voltage monitor. The integrated

buck converter is a high efficiency, low IQ switcher

using DCS control that extends light load efficiency

down to 10-μA load currents. The low quiescent

current during operation and shutdown enables

maximum battery life. The device supports charge

currents from 5 mA to 300 mA. The input current

limit, charge current, buck converter output voltage,

LDO output voltage, and other parameters are

programmable through the I

2C interface.