Low termination current for wafer-scale charger increases battery lifetime

September 03, 2019 //By Nick Flaherty
TI’s three-in-one BQ25619 switching boost converter achieves lowest quiescent current for small medical and personal electronics applications
TI’s three-in-one BQ25619 switching boost converter has low termination current and quiescent current for small medical and personal electronics applications

Texas Instruments (TI) has launched a switching battery charger with a termination current of 20 mA, compared to currents over 60 mA. A wafer scale package will be available later in the year for small equipment.

The low termination current of the BQ25619 enables a 7 percent higher battery capacity and longer run time. The BQ25619 charger also delivers three-in-one boost converter integration and ultra-fast charging with 95 percent efficiency at a 4.6V and 0.5A output. The 6μA quiescent current doubles the shelf life of ready-to-use electronics such as hearing aids, earbuds and wireless charging cases, IP network cameras, patient monitoring devices and personal care applications.

The integrated charge, boost converter and voltage protection eliminates the external inductor required by previous-generation charger ICs. Due to its integrated bidirectional buck or boost topology, the BQ25619’s charging and discharging capabilities require just a single power device. A settable top-off timer further increases run time, enabling users to charge their devices less frequently, while the device consumes 10 μA in operation.

Offered in a 24-pin wafer quad flatpack no-lead (WQFN) package, the charger is priced at US$1.45 in 1,000-unit quantities. The 30-pin BQ25618, with similar features, will be offered in a smaller wafer chip-scale package (WCSP) in the third quarter of 2019. Designers can use the BQ25619 evaluation module (EVM) to evaluate the device’s features and performance and speed time to market, available for US$99.


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