AN4394 Datasheet, PDF (1/18 Pages) STMicroelectronics – Evaluation board for SPV1050 ULP harvester

AN4394
Application note
Evaluation board for SPV1050 ULP harvester (boost architecture)
Domenico Ragonese
Introduction
The STEVAL-ISV019V1 is an evaluation board based on the SPV1050 ultralow power
energy harvester and battery charger. For any detail related to the SPV1050 features and
performances please refer to the SPV1050 datasheet.
The evaluation board implements the boost configuration of the DC-DC converter and has
the purpose of enhancing the SPV1050 based applications development by testing the
silicon performance thanks to many jumpers and test points, and by helping to find out the
best system configuration to make the SPV1050 working at the most of efficiency.
The STEVAL-ISV019V1 is configured to harvest energy from PV panels supplying
0.5 V ≤ V_MP ≤ 2.5 V and 30 µA ≤ I_MP ≤ 20 mA and charge a battery with the 3.7 V
undervoltage protection threshold (V_UVP) and 4.2 V end of charge voltage threshold (V_EOC).
Nevertheless, few easy changes on the application components (input and output resistor
partitioning, C_IN capacitor) allow to use a different PV panel and source (like TEG), and
a battery, by setting the V_{MPP_SET}, the V_UVP and the V_EOC thresholds according to the new
requirements. More in detail, operating ranges can be extended as follows: V_MP from
150 mV up to 5 V, I_MP up to 100 mA, V_UVP down to 2.2 V and V_EOC up to 5.3 V.
The STEVAL-ISV019V1 evaluation board is shown in Figure 1.
Figure 1. STEVAL-ISV019V1 evaluation board
May 2014
DocID025512 Rev 1
1/18
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