TI Introduces Ultra‑Compact, High‑Efficiency BQ25790/BQ25792 Buck‑Boost Battery Chargers

Texas Instruments announced its smallest buck‑boost battery charger ICs, the BQ25790 and BQ25792, which integrate power‑path management for maximum power density and offer universal, fast charging up to 97% efficiency. They deliver 10× lower quiescent current via USB‑C and USB‑PD in compact devices, portable medical equipment, and building automation.

The BQ25790 and BQ25792 are the industry’s first multi‑cell buck‑boost chargers with quiescent current under 1 µA. They provide at least five times longer shelf life than competitors through dual‑ship mode and shutdown functions that cut quiescent current tenfold. With an 8 mΩ battery FET resistance, engineers can push battery runtime in long‑term applications.

These devices achieve 50% greater power density and charge up to three times faster for USB‑C, USB‑PC, and wireless dual‑input charging. They support one to four cells in series and up to 5 A charging current across a 3.6 V‑24 V input range, ideal for USB‑C and USB‑PD use. The integrated dual‑input selector allows seamless switching between wireless, USB, barrel jack, and solar sources while maintaining 97% efficiency at 30 W.

They deliver 155 mW/mm² (100 W/in²), roughly twice the power density of competing solutions, enabling engineers to shrink size and reduce BOM. TI also claims these are the first buck‑boost chargers to fully integrate switching MOSFETs, a battery FET, current‑sensing circuits, and a dual‑input selector on a single die.

The BQ25790 (2.9 × 3.3 mm, 56‑pin WCSP) and BQ25792 (4 × 4 mm, 29‑pin QFN) are available from TI and authorized distributors. Pricing starts at $2.99 each in 1,000‑piece lots. An evaluation module (BQ25790EVM) is available for $149 on TI.com.

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