BQ25619RTWR

Features：

1 Features

· Single chip solution to charge wearable accessories from adapter or battery

· High-efficiency,1.5-MHz, synchronous switch-mode buck charger

 -95.5% Charge efficiency at 0.5 A and 94.5% efficiency at 1A

 -±0.5% Charge voltage regulation(10-mV step)

 -I2C Programmable JEITA profile of charge voltage, current and temperature thresholds

 -Low termination current with high accuracy 20mA±10 mA

 -Small inductor form factor of 2.5×2.0×1.0 mm3

· Boost mode with output from 4.6 Vto 5.15V

 -94% Boost efficiency at 1-A output

 -Integrated control to switch between charge and boost mode

 -PMID GOOD Pin control external PMOS FET for protection against fault conditions

· Single input to support USB input and high-voltage adapter and wireless power

 -Support 4-V to 13.5-V input voltage range with 22-V absolute max input rating

 -Programmable input current limit(IlNDPM) with IPC(100-mA to 3.2-A,100-mA/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 IPC configuration and autonomous charging for optimal system performance

· High integration includes all MOSFETs, current sensing and loop compensation

· Low Rdson 19.5-mQ BATFET to minimize charging loss and extend battery run time

 -BATFET Control for ship mode, and full system reset with and without adapter

· 7-uA Low battery leakage current in ship mode

· 9.5-uA 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

2 Applications

· Consumer wearables, smartwatch

· Personal care and fitness

· Headsets/headphone

· Earbuds(True Wireless or TWS) charging case

· Hearing aids charging case

3 Description 

The BQ25619 is a highly integrated 1.5-A switchmode battery charge management and system Power Path management device for single cell Li-Ion and Lipolymer battery. The low impedance Power Path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery run time during discharging phase. The BQ25619 can charge wearable accessories in direct path from an adapter or in boost mode from a battery, with PMID_GOOD pin to control the external PMOS FET load switch.

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