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Battery charger IC extends battery life in small medical devices

September 05, 2019

September 05, 2019

Texas Instruments introduced a new switching battery charger integrated circuit that supports a termination current of 20 mA. Compared to competing devices, which typically support a termination current higher than 60 mA, TI’s BQ25619 enables 7% higher battery capacity and longer run time. The BQ25619 charger also delivers three-in-one boost converter integration and ultra-fast charging, offering 95% efficiency at a 4.6-V and 0.5-A output. Additionally, with the industry’s lowest quiescent current, the new charger can double the shelf life of ready-to-use electronics.

The BQ25619 charger helps engineers design more efficiently for small medical and personal electronics applications such as hearing aids, earbuds and wireless charging cases, IP network cameras, patient monitoring devices and personal care applications.

The industry’s lowest termination current for switching chargers: An ultra-low termination current of 20 mA increases battery capacity and run time by up to 7%. The BQ25619’s settable top-off timer further increases run time, enabling users to charge their devices less frequently. The BQ25619 reduces battery leakage down to 6 uA in ship mode, which conserves battery energy to double the shelf life for the device. While in battery-only operation, the device consumes only 10 uA, to support standby systems. The BQ25619 includes integrated charge, boost converter and voltage protection to support efficient design for space-constrained applications and eliminate 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.

The BQ25619 expands TI’s portfolio of industry-leading battery-charger solutions, offering single- and multicell switch-mode chargers for high-capacity batteries, as well as linear chargers with high integration to extend battery run time and reduce total solution size. Learn more about TI’s battery charging solutions for accurate, dependable and faster, cooler charging. Designers can use the BQ25619 evaluation module to easily evaluate the device’s features and performance and speed time to market.

>> This article was originally published on our sister site, Power Electronic News: "TI: three-in-one switching boost converter achieves lowest quiescent current."

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