Fujitsu releases new energy harvesting power management IC products

Fujitsu Semiconductor Europe (FSEU) has released two new power management IC products developed to use energy harvesting, the MB39C811 DC/DC buck converter and the MB39C831 DC/DC boost converter. The MB39C811 features a quiescent current of just 1.5µA while the MB39C811 is said to represent the world”s first simultaneous use of energy generation from both light and vibration using only one power management IC device.

The MB39C831 boost converter includes a function that automatically responds to changes in the surrounding environment in order to store electrical power, such as harvesting power from light according to variations in ambient light as well as harvesting thermal power according changes in ambient temperature. This function enables the unit to store energy harvested from the different elements at very high levels of efficiency.

Deploying these new products is expected to contribute to new battery-free technologies in areas such as energy management for homes and buildings as well as wireless sensor networks for farms, and will also lead to longer battery lives for portable devices.

Energy harvesting is the process of collecting, or harvesting, minute amounts of unharnessed energy from the surrounding environment, including light and vibration, and converting these to electricity. Energy harvesting is expected to be used as a power source in sensor nodes for wireless sensor networks, among other potential applications, thereby contributing to the realization of a low-carbon society. Fujitsu”s two new power management IC”s play an extremely important role in the successful commercialisation of energy harvesting technologies.

The MB39C811 is a highly efficient DC/DC buck converter that is equipped with an internal low-loss bridge rectifier. By optimising the circuit design, the MB39C811 achieves ultra-low power operation with a quiescent current of just 1.5µA, contributing to the successful development of battery-free technologies in areas such as sensing devices. Furthermore, the MB39C811 is able to be configured to 8 different output voltages, making it able to supply output currents up to 100mA. The MB39C811 is also the world”s first power management IC that can individually perform and manage energy harvesting using both light and vibration elements simultaneously. The circuit technology employed by the MB39C811 to achieve ultra-low power operation was jointly developed by Fujitsu Semiconductor and Fujitsu Laboratories.

The MB39C831 is a synchronous rectification DC/DC boost converter that uses power obtained from single- and multi-cell solar batteries or thermal electric generators, in order to charge lithium-ion batteries efficiently. The MB39C831 is equipped with an integrated MPPT function, which enables to collect maximum power by tracking harvester”s maximum power point that vary according to differences in light levels and temperature. The MB39C831 is also equipped with a safeguard feature to enable safer charging for lithium-ion batteries. The low-voltage circuitry of the MB39C831 allows the system to start up from only 0.35V, making it well suited to a wide range of applications, including wireless sensor networks.

The two products are certified by Fujitsu Group as “Super Green” products, which are recognized as having superior environmental characteristics to others we supply or are available on the market.


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