Tiny battery chargers deliver 50% greater power density

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TI’s BQ25790 and BQ25792 highly integrated buck-boost battery chargers offer 50% greater power density and three times faster charging for USB Type-C, USB PC, and wireless dual input charging.

By Gina Roos, editor-in-chief

Texas Instruments (TI) has claimed the smallest buck-boost battery charger ICs with the introduction of the BQ25790 and BQ25792 devices. These buck-boost battery chargers integrate power-path management for maximum power density and universal and fast charging at up to 97% efficiency. They also provide 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.

Touted as the industry’s first multi-cell buck-boost battery chargers with less than 1 µA of quiescent current, the BQ25790 and BQ25792 deliver 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 can further maximize battery run time for applications that require long periods of operation, said TI.


Offering 50% greater power density and three times faster charging for USB Type-C, USB PC, and wireless dual input charging, the BQ25790 and BQ25792 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 the industry’s fastest charge – 97% efficiency at 30 W, according to TI.

The chargers deliver 155 mW/mm2 (100 W/in2) of power – up to two times more than competitive devices, said TI, which helps engineers reduce solution size and bill of materials (BOM). In addition, the buck-boost chargers are claimed to be the industry’s first to fully integrate the following components: switching MOSFETs, a battery FET, current-sensing circuits and a dual-input selector.

The BQ25790 (2.9 x 3.3-mm, 56-pin WCSP) and the BQ25792 (4 x 4-mm, 29-pin QFN) chargers are available from TI and authorized distributors. Pricing starts at $2.99 and $2.99 in quantities of 1,000, respectively. The BQ25790EVM evaluation module is available on TI.com for $149.