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Texas Instruments bq25618E/bq25619E I2C Controlled Battery Charger

Texas Instruments bq25618E/bq25619E I²C Controlled Battery Charger is a highly integrated 1.5A switch-mode battery charge management and system Power Path management device for Li-ion and Li-polymer battery. It features fast charging with high input voltage support for a wide range of applications including wearables, and earphone charging cases. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, and extends battery run time during the discharging phase. Its input voltage and current regulation, low termination current, and battery remote sensing deliver maximum charging power to the battery.

The Texas Instruments bq25618E/bq25619E is highly integrated, with input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. It also integrates the bootstrap diode for the high-side gate drive for simplified system design. The I²C serial interface with charging and system settings makes the device a truly flexible solution.

Features

High-efficiency, 1.5MHz, synchronous switch-mode buck charger
- 95.5% charge efficiency at 0.5A and 94.5% efficiency at 1A
- ±0.5% charge voltage regulation (10mV step)
- I²C programmable JEITA profile of charge voltage, current, and temperature thresholds
- Low termination current with high accuracy 20mA ±10mA
- Small inductor form factor of 2.5 x 2.0 x 1.0mm³
Single input supporting USB input, high-voltage adapter, or wireless power
- Support 4V to 13.5V input voltage range with 22V absolute max input rating
- Programmable input current limit (IINDPM) with I²C (100mA to 3.2A, 100mA/step)
- Maximum power tracking by input voltage limit (VINDPM) up to 5.4V
- VINDPM threshold automatically tracks battery voltage

Narrow VDC (NVDC) power path management
- System instant-on with no battery or deeply discharged battery
Flexible I²C configuration and autonomous charging for optimal system performance
High integration includes all MOSFETs, current sensing, and loop compensation
Low R_DSON 19.5mΩ BATFET to minimize charging loss and extend battery run time
- BATFET control for ship mode and full system reset with and without adapter
7µA low battery leakage current in ship mode
9.5µA low battery leakage current with system standby
High accuracy battery charging profile
- ±6% charge current regulation
- ±7.5% input current regulation
- Remote battery sensing to charge faster
- Programmable top-off timer for full battery charging

Applications

Consumer wearables, smartwatch
Personal care and fitness
Headsets/headphone

Earbuds (True Wireless or TWS) charging case
Hearing aids charging case

Texas Instruments bq25618E/bq25619E I2C Controlled Battery Charger

Features

Applications

Simplified Application

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