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Thermal Energy Harvesting IC solution
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Product Description
Highly efficient, regulated dual-outputs, ambient energy manager for TEG with optional primary battery
AEM20940 Thermal Energy Harvesting IC is an integrated Ambient Energy Manager (AEM) that extracts DC power from a thermoelectric generator (TEG), simultaneously storing energy in a rechargeable element and supplying the system with two independent regulated voltages. The AEM20940 is designed to extend battery lifetime and ultimately eliminate the primary energy storage element in a large range of wireless applications, such as industrial monitoring, home automation, and smart agriculture.
The AEM20940 harvests the available input current up to 110mA. It integrates an ultra-low power boost converter to charge a storage element, such as a Li-ion battery, a thin film battery, a supercapacitor, or a conventional capacitor. The boost converter operates with input voltages in a range from 50mV to 5V. With its unique cold-start circuit, the AEM20940 can start operating with empty storage elements at an input voltage as low as 60mV and an input power as low as 150µW.
The low-voltage supply of the AEM20940 can be used to drive a microcontroller at 1.2V or 1.8V. The high-voltage supply may typically drive a radio transceiver at a configurable voltage between 1.8V, 2.5V, or 3.3V. Both are driven by highly-efficient LDO (Low Dropout) regulators for low noise and high stability.
The AEM20940 integrates all the active elements for powering a typical wireless sensor. Only five capacitors and two inductors are required, available in the small 0402 and 0603 sizes, respectively. With only seven external components, integration is maximum, footprint and BOM are minimum, optimizing the time-to-market and the costs of wireless sensor node designs.
The e-peas AEM20940 is offered in a QFN28 package, with a wide -40ºC to +125ºC operating temperature range.
Features:
Ultra-low-power start-up
- Cold start from 60 mV input voltage and 150 µW input power with the optional external module (typical)
- Cold start from 380 mV and 100 µW input power without the optional external module (typical)
Ultra-low-power Boost regulator
- Configurable MPPT with 2-pin programming
- Selectable Voc ratios of 50, 55 or 75%
- Open circuit voltage sensing for MPPT every 21 s
- Input voltage operation range from 50 mV to 5 V
Integrated LDO regulator at low voltage
- 1.2/1.8 V, high efficiency
- Up to 20 mA load current
- Power gated by external control
Integrated LDO regulator at high voltage
- Configurable : 1.8-2.5-3.3 V
- Up to 80 mA load current with 300 mV drop-out
- Power gated by external control
Flexible energy storage management
- Programmable overcharge and overdischarge protection
- For any type of rechargeable battery or (super)capacitor
- Fast supercapacitor charging
- Warns load when the battery is running low
- Warns when output voltage regulators are available
Optional primary battery
- Automatically switches to the primary the battery when secondary battery is exhausted
