All our PMIC share the same purpose : manage the power from an harvester to a storage and/or a load.
However, their coldstart, MPPT ratio and timing might be different to be adapted to the source they should harvest from. For more details, please see “What is the MPPT ratio?” question.
To choose wisely your PMIC, please keep in mind it must be adapted to your harvester and its behavior.
Here below, the PMIC recommanded with the harvester for different sources :
- [LIGHT OUTDOOR] Solar cell : AEM10941
- [LIGHT INDOOR] photovoltaic cell : AEM10941
- [THERMAL] TEG : AEM20940
- [VIBRATION] Piezoelectronic generator or inductivce: AEM30940
- [RF] Antenna : AEM30940 with adapted matching network and rectifier
- [RF] Antenna : AEM40940 with adapted matching network and rectifie
- [OTHER] ? : See below more details.
Using another source or custom harvester ?
In that case, we recommend you to define MPPT ratio or impedance to select the PMIC adapted. Be careful to study the complete harvester (it might include a rectifer to deliver DC signal to the AEM).
==> To do so, draw the P[W]-V[V] or P[W]-R[Ω] curve. See more explanation in user guide AEM10941.
AEM10941 proposes 70 – 80 – 85 and 90 % of the VoC ~~ AEM20940 proposes 50 – 55 – 80 % of the VoC ~~ AEM30940 proposes 50 – 65 – 80 % of the VoC
Be careful with MPPT timing :
AEM10941 evaluates MPPT each 5 s and let’s 81 ms to achieve open-circuit voltage (see chapter « Maximum power point tracking » in datasheet).
AEM20940 evaluates MPPT each 21 s and let’s 330 ms to achieve open-circuit voltage (see chapter « Maximum power point tracking » in datasheet).
AEM30940 evaluates MPPT each 0.33 s and let’s 5 ms to achieve open-circuit voltage (see chapter « Maximum power point tracking » in datasheet).
If your harvester is characterized for an impedance : AEM30940 and AEM20940 proposes the ZMPPT feature.
For more details, please see “How do I set ZMPPT?” question.
Please keep in mind, maximum input current is about 110 mA.