SIMO PMICs extend battery life for wearables and hearables

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Maxim Integrated’ SIMO power management ICs cuts solution size by 50%, while extending battery life by 20% for wearable and hearable devices

By Gina Roos, editor-in-chief

The MAX77654 single inductor, multiple output (SIMO) power management IC (PMIC) from Maxim Integrated Products, Inc. can cut the power solution size in half for consumer devices, while extending battery life by 20%. Designed as a replacement for traditional power management architectures, the MAX77654 SIMO PMIC replaces three buck-boost converters and three inductors with a single converter and a single inductor. It also replaces two LDOs/load-switches, a battery charger, and additional passives, resulting in a 50 percent smaller solution size at 19 mmcompared to discrete solutions.

Overall, the PMIC solution offers up to 40 percent fewer components and 23 percent lower bill of materials cost compared to discrete solutions. With the reduced solution size, system designers can pack more functionality in their applications such as wearables, hearables, and other compact consumer devices compared to using traditional power solutions, said Maxim.

Designers can also add more functions with less than 500 nA shutdown current and a low supply current of 6 µA with five regulators operating.


The SIMO PMIC delivers three outputs with just one inductor at 91 percent efficiency, which claims 16 percent greater efficiency than traditional 4-chip systems. Thanks to the 91% efficiency, the device delivers 20% longer battery life for consumer devices.

The MAX77654 also delivers seven times lower heat dissipation compared to discrete solutions, and reduces system board temperature by more than 20°C when compared to an alternative single inductor system power solution. It also offers excellent output voltage ripple of less than 20 mVp-p for noise sensitive rails.

The MAX77654 is available from Maxim Integrated for $2.00 (1000-up, FOB USA), and is  available through its authorized distributors. The MAX77654EVKIT# evaluation kit is available for $105.