Solar harvesting solution increases wearable runtime

Designers are often challenged with the tradeoff between small size and long runtime for wearable and IoT applications. By enabling solar charging in these highly space-constrained products, the MAX20361 can extend the runtime of those devices by providing a supplemental power source.

This solar harvester reduces solution size by at least half compared to the closest competitor. In addition, the MAX20361 increases harvested energy with up to 5 percent better boost efficiency than the closest competitor, coupled with an adaptive MPPT approach which can improve the overall system level efficiency even further.

Key advantages

• Smallest Size: Industry’s smallest solar harvesting solution due to reduced component size and smaller, fewer external components; at least 50 percent smaller solution size compared to the closest competitor
• Higher Efficiency: Increased boost efficiency maximizes harvested energy with up to 5 percent better boost efficiency than the closest competitor; additional harvesting gains can be achieved through adaptive MPPT features coupled with the unique integrated harvesting gauge for real-time indications of efficiency to optimize performance

“This device offers exciting possibilities for a new supplemental power source to continually charge the battery of a device,” said Frank Dowling, Director of the Industrial and Healthcare Business Unit at Maxim Integrated. “For example, if you can harvest just 30mW of solar power per day on a 300mAh battery system which typically runs for three weeks, you can as a result extend that runtime by over 50%.”

“Innovation continues to drive adoption of consumer wearables with global revenue estimated to grow at a compound annual growth rate (CAGR) of 15% in the next four years,” added James Hayward, Principal Analyst at IDTechEx Research. “For device manufacturers, longer battery life and smaller form factor remain key product features toward market differentiation and user satisfaction.”