Thursday, June 13, 2024

Fast-Charging, Tiny Power Management IC For Wearables and Hearables

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The device delivers up to four hours of playtime after a short, ten-minute charge and reduces bill of materials by 60 percent

Charging wearables, hearables and Internet of Things (IoT) devices faster and in less space than conventional power management ICs (PMICs) is the new MAX77659 single-inductor multiple-output (SIMO) PMIC by Maxim Integrated. An integrated switch-mode buck-boost charger delivers over four hours of playtime after a short, ten-minute charge. A single inductor powers multiple rails, reducing the bill of materials (BOM) by 60 per cent and shrinking the total solution size by 50 per cent.

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The MAX77659 SIMO PMIC integrates a switch-mode buck-boost charger and three independently programmable buck-boost regulators, all sharing a single inductor to minimise total solution size. The regulators extend battery life by operating at 91 per cent efficiency during moderate to heavy load conditions while consuming only 5µA of quiescent current during light load conditions. The MAX77659 SIMO PMIC supports autonomous headroom control, which reduces heat dissipation by minimising the voltage drop while providing enough headroom to regulate the charging current. 


  • Fast 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 playtime compared to just one-and-a-half with conventional solutions post charge
  • Small Size: The MAX77659 comes in a tiny 30-bump wafer-level package (WLP) that measures 2.55 mm x 2.37mm. The use of a single inductor and integration of the charger offers a total solution size of just 22mm square, small enough for the most compact wearable and hearable applications.

“Analog Devices’ SIMO product technology shrinks size and boosts performance in the smallest of hearable and wearable devices,” said 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 maximising 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 and MAX77659EVKIT are now available.  


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