ST Life.augmented


Up to 3 W solar and USB battery charger for single-cell Li-Ion and Li-Po batteries based on the SPV1040, STBC21 and STC3100
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The STEVAL-ISV014V1 demonstration board provides a very high level of integration being based on the ST devices SPV1040 (solar energy harvester and power optimizer), STBC21 (single cell Li-Ion battery charger) and STC3100 (gas gauge).

The STEVAL-ISV014V1 controls the single-cell Li-Ion battery charging thanks to the STBC21, which can be supplied by a solar panel or by an USB (type-A connector) compatible supply. The battery charging status set by STBC21 can be controlled via I2C. Safety during the battery charge process is guaranteed by the gas-gauge controller device STC3100.

When the energy is provided by the solar panel, the SPV1040 optimizes the power extracted from the source and boosts the voltage, charging a 440mF super-capacitor, which is connected to the input stage of the STBC21 by a STS5PF30L P-channel power MOSFET.

Furthermore, the STEVAL-ISV014V1 can be used to supply a type-B USB compatible load by an external Li-Ion battery. In this case, the L6920 voltage boost controller will regulate the battery voltage up to the 5 V required by the USB standard.

Finally, the STEVAL-ISV014V1 has a dedicated charging monitor circuitry implemented by 4 LEDs and by the TS339 quad comparator.

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Data Brief

Key Features

  • Solar section
  • Solar energy harvester with proprietary “Perturb and Observe” embedded MPPT algorithm
  • Reverse polarity protection for solar panel connection
  • Battery charging section
  • Both linear and quasi-pulse operation, with programmable charge current (up to 1 A) in both fast charge and pre-charge mode
  • Selectable 4.1 V and 4.2 V output voltage (±1% accuracy)
  • Programmable termination current, pre-charge mode voltage threshold and charge time setting by I2C
  • Coulomb counter available via I2C
  • Status outputs to drive LEDs or host processor interface
  • Charge status LED indicator
  • Battery protection section
  • Battery absence detection
  • Battery thermal control (monitoring and protection) by NTC or PTC thermistor interface
  • 5 V USB supply output from external battery
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1537: Up to 3 W solar and USB battery charger for single-cell Li-Ion and Li-Po batteries based on the SPV1040, STBC21 and STC3100
2.0 349 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISV014V1 gerber files
1.0.0 607 KB

Bill of Materials

Description Version Size
2.0.0 73 KB

Schematic Pack

Description Version Size
STEVAL-ISV014V1 schematics
2.0.0 82 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISV014V1ActiveSPV1040; STBC21; ST3100Buy Direct128.62Distributor reported inventory date: 2014-04-15
Distributor NameRegionStockMin. order

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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