BQ25618YFFR

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 at1A

 -±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 20 mA±10mA

 -Small inductor form factor of 2.5x2.0×1.0 mm3

· Boost mode with output from 4.6 V to 5.15V

 -94% Boost efficiency at 1-A output 

 -Integrated control to switch between charge and boost mode 

 -PMID GOOD Pin control external PMOS FETfor 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 (INDPM) 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 I2C 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 fullsystem 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 BQ25618/619 integrates charge, boost converter and voltage protection in a single device. It offers the industry's lowest termination current for switchingchargers to charge wearable devices by full battery capacity. The BQ25618/619 best-in-class low quiescent current reduces battery leakage down to 6 uA in ship mode, which conserves battery energy to double the shelf life for the device. BQ25619 is in 4x4 QFN package for easy layout. BQ25618 is in2.0x2.4mm2 WCSP package for space limited design.

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