Single cell buck battery charger with 20mA termination

23rd October 2019

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The BQ25618/619 from Texas Instruments integrates charge, boost converter and voltage protection in a single device. It offers the industry’s lowest termination current for switching chargers to charge wearable devices by full battery capacity.

The BQ25618/619 low quiescent current reduces battery leakage down to 6uA in ship mode, which conserves battery energy to double the shelf life for the device. BQ25619 is in four by four QFN package for easy layout. BQ25618 is in 2.0x2.4mm2 WCSP package for space limited design.

The BQ25619/618 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 case. Its low impedance power path optimises switch-mode operation efficiency, reduces battery charging time and extends battery run time during discharging phase.

Its input voltage and current regulation, low termination current, and battery remote sensing deliver maximum charging power to the battery. The solution 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.

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