Tiny PMIC charges wearables, hearables faster

September 21, 2021 // By Rich Pell
Tiny PMIC charges wearables, hearables faster
Semiconductor company Analog Devices has introduced a power management IC (PMIC) that it says charges wearables, hearables, and IoT devices faster and in less space than any other PMIC available today.

The MAX77659 single-inductor multiple output (SIMO) PMIC with integrated switch-mode buck-boost charger delivers over four hours of play time after a short, ten-minute charge. It uses a single inductor to power multiple rails, reducing the bill of materials (BOM) by 60 percent and shrinking total solution size by 50 percent, says the company.

"Analog Devices' SIMO product technology shrinks size and boosts performance in the smallest of hearable and wearable devices," says Roger Yeung, Executive Business Manager for the Battery Power Solutions Business Unit at Maxim Integrated, now part of Analog Devices. "The MAX77659 brings the 'on-the-go' lifestyle to the next level by minimizing plug-in time and maximizing play time. The MAX77659 PMIC frees up board real estate to pack in additional features such as expanded memory storage, location tracking and vital sensing demanded by today's portable consumer and medical devices."

The MAX77659 SIMO PMIC integrates a switch-mode buck-boost charger and three independently programmable buck-boost regulators, all sharing a single inductor to minimize total solution size. The regulators extend battery life by operating at 91 percent efficiency during moderate to heavy load conditions while consuming only 5µA of quiescent current during light load conditions.

The device supports autonomous headroom control, which reduces heat dissipation by minimizing the voltage drop while providing enough headroom to regulate the charging current. Key features and benefits of the MAX77659 include:

  • Fastest Charging: The MAX77659 integrates a switch mode buck-boost charger that charges wearables and hearables four times faster. A short, ten-minute charge delivers over four hours of play time compared with traditional solutions that can deliver just one-and-a-half hours of play time post charge.
  • Smallest Size: The MAX77659 is offered in a tiny 30-bump wafer level package (WLP) that measures 2.55 mm x 2.37mm. Use of a single inductor and integration of the charger reduces the bill of materials by 60 percent for a total solution size of just 22mm 2, small enough

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