Buck-boost USB-C chargers cut board footprint

June 29, 2020 //By Nick Flaherty
The BQ25790 and BQ25792 from TI increase power density and provide three times faster charging for USB-C PD and wireless dual-input charging
The BQ25790 and BQ25792 from TI increase power density and provide three times faster charging for USB-C PD and wireless dual-input charging

Texas Instruments (TI) has launched two buck-boost battery charger devices for USB-C and wireless charging designs that is says is the smallest in the industry.

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 USB-C chargers support charging of 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 charger chips have an integrated dual-input selector that supports multiple power sources, including wireless, USB, barrel jack and solar charging, while delivering fast charging with an efficiency of 97 percent at 30W.

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, says TI. On-the-go (OTG) charging is supported with a bi-directional operation for forward and reverse charging.

The USB-C charger chips provide a power density of 155 mW/mm 2 (100 W/in 2) by integrating the MOSFETs, battery FET, current-sensing circuits and 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 the industry’s first 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 can further maximize battery run time for applications that require long periods of operation.

For example, video doorbell applications that typically rely on an A/C power supply can operate without interruption when the primary source of power switches to the battery pack. By helping reduce power


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