PMIC cuts footprint for wearables by half

September 22, 2021 // By Nick Flaherty
PMIC cuts footprint for wearables by half
The MAX77659 SIMO PMIC with built-in switching charger reduces bill of materials by 60 percent

Following its acquisition of Maxim Integrated, Analog Devices has launched a single-inductor multiple output (SIMO) power management IC (PMIC) with integrated switch-mode buck-boost charger from 

The MAX77659 charges wearables, hearables and Internet of Things (IoT) devices in ten minutes with a single inductor to power multiple rails. This can reduce the bill of materials (BOM) by 60 percent and shrinking the footprint by 50 percent to 22mm² for wearable and hearable applications.

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 MAX77659 SIMO PMIC supports autonomous headroom control, which reduces heat dissipation by minimizing the voltage drop while providing enough headroom to regulate the charging current.

“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 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 is offered in a 30-bump wafer level package (WLP) that measures 2.55 mm x 2.37mm x 0.5mm. The MAX77659EVKIT is available as of now.

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