ST Life.augmented


High efficiency solar battery charger with embedded MPPT
  • active Active

The SPV1040 device is a low power, low voltage, monolithic step-up converter with an input voltage range from 0.3 V to 5.5 V, and is capable of maximizing the energy generated by even a single solar cell (or fuel cell), where low input voltage handling capability is extremely important.

Thanks to the embedded MPPT algorithm, even under varying environmental conditions (such as irradiation, dirt, temperature) the SPV1040 offers maximum efficiency in terms of power harvested from the cells and transferred to the output.

The device employs an input voltage regulation loop, which fixes the charging battery voltage via a resistor divider. The maximum output current is set with a current sense resistor according to charging current requirements.

The SPV1040 protects itself and other application devices by stopping the PWM switching if either the maximum current threshold (up to 1.8 A) is reached or the maximum temperature limit (up to 155 °C) is exceeded.

An additional built-in feature of the SPV1040 is the input source reverse polarity protection, which prevents damage in case of reverse connection of the solar panel at the input.

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Errata Sheet
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Key Features

  • 0.3 V to 5.5 V operating input voltage
  • 140 mΩ internal synchronous rectifier
  • 120 mΩ internal power active switch
  • 100 kHz fixed PWM frequency
  • Duty cycle controlled by MPPT algorithm
  • Output voltage regulation, overcurrent and overtemperature protection
  • Input source reverse polarity protection
  • Built-in soft-start
  • Up to 95% efficiency
  • 3 mm x 4.4 mm TSSOP8 package

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6991: High efficiency solar battery charger with embedded MPPT
5.0 966 KB

Application Notes

Description Version Size
AN3319: STEVAL-ISV006V2: solar battery charger using the SPV1040
8.2 1,141 KB
AN4050: STEVAL-ISV012V1: lithium-ion solar battery charger
2.0 1,169 KB
AN4123: STEVAL-ISV015V1 up to 2.5 W solar USB charger
2.0 990 KB

Design Notes & Tips

Description Version Size
DN0012: Boost converter with MPPT drives isolated solar panel loads
1.0 311 KB

Presentations & Training Material


Description Version Size
SPV1040: solar battery charger for portable
1.0 346 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-ISV012V1 Solar battery charger for Li-Ion batteries
STEVAL-ISV006V2 Up to 5 W solar battery charger with embedded MPPT based on SPV1040
STEVAL-ISV015V1 Up to 2.5 W solar USB supply based on the SPV1040 and LD39050

Publications and Collaterals


Description Version Size
High-efficiency solar battery charger
2.0.0 221 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SPV1040TActiveTSSOP8Tube-40125_-1.25Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA15862000
SPV1040TTRActiveTSSOP8Tape And Reel-40125_-1.25Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA49794000

(*) 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.