STEVAL-ISV019V1

The STM-STEVAL-ISV019V1-EVAL is an evaluation board based on the ultralow power energy harvester and battery charger SPV1050. 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 device working at the most of efficiency. The STEVAL-ISV019V1 is optimized to: Harvest energy from PV panels supplying 0.5 V = VMP = 2.5 V and 30 µA = IMP = 20 mA. Charge a battery with 3.7 V undervoltage protection threshold (VUVP) and 4.2 V end of charge voltage threshold (VEOC). Nevertheless, few easy changes on the application components (input and output resistor partitioning, CIN capacitor) allow to use a different PV panel and source (like TEG), and a battery by setting the VMPP_SET, the VUVP and the VEOC thresholds according to the new source and load. More in detail, operating ranges can be extended as follows: VMP from 150 mV up to 5 V, IMP up to 100 mA, VUVP down to 2.2 V and VEOC up to 5.3 V.

First startup at Vin = 500 mV Input voltage working range: 150 mV = Vin = VEOC End of charge battery voltage: VEOC = 4.25 V Battery undervoltage protection: VUVP = 3.7 V