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TI launches buck-boost battery chargers

Texas Instruments (TI) has introduced buck-boost battery charger integrated circuits, which integrate power-path management for maximum power density and universal and fast charging.

The BQ25790 and BQ25792 support efficient charging and 10 times lower quiescent current through USB Type-C and USB Power Delivery (PD) ports in small personal electronics, portable medical devices and building automation applications.

Both devices offer the flexibility to charge batteries with one to four cells in a series and up to 5 A of charging current across the full input-voltage range (3.6 V to 24 V) for USB Type-C and USB PD applications. The chargers’ integrated dual-input selector supports multiple power sources, including wireless, USB, barrel jack and solar charging, while delivering fast charging - 97% efficiency at 30 W.

Universal charging enables portable medical devices, such as blood-pressure monitors and low-power continuous positive airway pressure (CPAP) machines, to charge from car adapters or USB-PD adapters, bringing greater flexibility and convenience to portable medical devices. On-the-go (OTG) charging is supported with a bi-directional operation for forward and reverse charging.

The chargers deliver 155 mW/mm2 (100 W/in2) of power, helping engineers reduce solution size and bill of materials (BOM). The new buck-boost chargers are the industry’s first to fully integrate: switching metal-oxide semiconductor field-effect transistors (MOSFETs), a battery FET, current-sensing circuits and a dual-input selector. The reduction in component count is particularly valuable for applications such as smart speakers, which are shrinking in size and cost as market adoption increases.

The BQ25790 and BQ25792 are multicell buck-boost battery chargers with less than 1 µA of quiescent current, delivering at least five times longer shelf life than competitive devices through a dual ship mode and shutdown function that delivers up to 10 times lower quiescent current. Combined with an extremely low battery FET resistance of 8 mΩ, engineers will be able to maximize battery run time for applications that require long periods of operation.

The BQ25790 is available from TI and authorised distributors in 2.9-mm-by-3.3-mm, 56-pin wafer chip scale package (WCSP). The BQ25792 is available from TI and distributors in a 4-mm-by-4-mm, 29-pin quad flat no-lead (QFN) package.


Author
Neil Tyler

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