Texas Instruments BQ25122

Description

The bq25122 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 I2C interface.

Features

• Increases System Operation Time Between Charges
• Configurable 300-mA Buck Regulator (1.2-V Default)
• 700 nA (typical) Iq with Buck Converter Enabled (No Load)
• Configurable Load Switch or 100mA LDO Output (Load Switch enabled 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
• Highly Integrated Solution with Small Footprint
• 2.5 mm x 2.5 mm WCSP Package and 6 External Components for Minimal Solution
• Push-Button Wake-Up and Reset with Adjustable Timers
• Power Path Management for Powering the System and Charging the Battery
• Power Path Management enables < 50 nA 150 nA Ship Mode Battery Quiescent Current for Longest Shelf Life
• Battery Charger Operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V Tolerant)
• Dedicated Pins for Input Current Limit, Charge Current, Termination Current, and Status Output
• I2C Communication Control
• Charge Voltage and Current
• Termination Threshold
• Input Current Limit
• Load Switch Control
• Controls for Interrupts for Faults and Status
• System Output Voltage Adjustment
• LDO Output Voltage Adjustment
• Safety-Related Certification:
• TUV IEC 62368-1 Certification

Typical applications

• Hearing Aids, Hearables, Smart Watches, and other Wearable Devices, Rechargeable Toys
• Fitness Accessories, Health Monitoring Medical Accessories

More information

• Datasheet
• IC product information