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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.
电池管理
Li-Ion
3.6 V to 4.65 V
300 mA
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