Constant voltage PMIC for intermittent energy harvesting

e-peas in Belgium has launched three power management chips with constant voltage inputs for intermittent and pulsed power energy harvesting sources.

The AEM00330 is a full power management chip, whereas the AEM00300 being a storage element charger. Both of them are self-configurable, with the ability to automatically switch between buck, buck-boost and boost operation.

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This enables faster adjustments with different source, storage and load arrangements such as step-up and step-down and maximizes these devices’ energy transfer capabilities. They have been designed to respond instantly to the power input once a pre-defined threshold has been exceeded, providing quick and effective energy extraction.

The operating input voltage range goes from 140mV to 4.5V, so power levels of 3µW to 570mW can be managed. Another key feature is the ability to swap from powering the load or the storage element, giving greater flexibility in applications where there should be initial focus on one or the other. Among the potential uses for these devices are door access systems, smart switches for smart home or smart building, point-of-sales (PoS) units and smart running shoes.

The AEM00940 is a boost solution designed for supporting high efficiency energy transfer from sources having a lower voltage than the storage element. It has an LDO-based output rather than a DC-DC-based one. The selectable operating input voltage spans from 50mV to 4.5V.

As well as pulsed and intermittent sources, the three PMICs can be used with sources that require a long time to reach their open-circuit. They also support single and dual cell supercapacitors, Li-Ion, LiFePO4, Li-Po, NiCd, thin film batteries and solid-state batteries. Each of them has selectable and adjustable storage element protection mechanisms, covering over-charge and over-discharge.