AN4397 datasheet(1/19 Pages) STMICROELECTRONICS

Il numero della parte	AN4397

Spiegazioni elettronici	Evaluation board for SPV1050 ULP harvester

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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May 2014

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AN4397

Application note

Evaluation board for SPV1050 ULP harvester (buck-boost

architecture)

Domenico Ragonese

Introduction

The STEVAL-ISV020V1 is an evaluation board based on the ultralow power energy

harvester and battery charger SPV1050. For any detail related to the SPV1050 features and

performances please refer to the SPV1050 datasheet.

The evaluation board implements the buck-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-ISV020V1 board is optimized to:

 Harvest energy from PV panels supplying 2.6 V ≤ VMP ≤ 9 V and 10 µA ≤ IMP ≤ 20 mA.

 Charge a battery with the 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

source and load. More in detail, operating ranges can be extended as follows:

VMP from 150 mV up to 18 V, IMP up to 100 mA, VUVP down to 2.2 V and VEOC up to 5.3 V.

The STEVAL-ISV020V1 is shown in Figure 1.

Figure 1. STEVAL-ISV020V1 evaluation board

www.st.com

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