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Interleaved DC-DC boost converter with built-in MPPT algorithm

The SPV1020 is a monolithic 4-phase interleaved DC-DC boost converter designed to maximize the power generated by photovoltaic panels independent of temperature and amount of solar radiation.

Optimization of the power conversion is obtained with embedded logic which performs the MPPT (max. power point tracking) algorithm on the PV cells connected to the converter.

One or more converters can be housed in the connection box of the PV panels, replacing the bypass diodes. As the maximum power point is locally computed, the efficiency at system level is higher than that of conventional topologies, where the MPP is computed in the main centralized inverter.

For a cost effective application solution and to minimize size, the SPV1020 embeds power MOSFETs for active switches and synchronous rectifiers, minimizing the number of external devices. In addition, the 4-phase interleaved topology of the DC-DC converter obviates the need to use electrolytic capacitors, which may severely limit system lifetime.

The SPV1020 operates at fixed frequency in PWM mode, where the duty cycle is controlled by the embedded logic running a Perturb&Observe MPPT algorithm. The switching frequency, internally generated and set by default at 100 kHz, is externally adjustable from 50 kHz to 200 kHz, while the duty cycle can range from 5% to 90% with a step of 0.2%.

The safety of the application is guaranteed by stopping the drivers in the case of output overvoltage or overtemperature.

Multiple SPV1020s can be used in a panel array with one SPV1020 per panel. Panels can be connected in series, in parallel, or series/parallel combinations.

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Errata Sheet
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Key Features

  • PWM mode DC-DC boost converter
  • Duty cycle controlled by MPPT algorithm with 0.2% accuracy
  • Operating voltage range 6.5 - 40 V
  • Overvoltage, overcurrent, overtemperature protection
  • Interleaved 4-phase topology
  • Built-in soft-start
  • Up to 98% efficiency
  • Power capability 320 W at 40 V output
  • Automatic transition to burst mode for improved efficiency at low solar radiation
  • SPI interface

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6854: Interleaved DC-DC boost converter with built-in MPPT algorithm
4.0 321 KB

Application Notes

Description Version Size
AN3392: Designing with the SPV1020, an interleaved boost converter with MPPT algorithm
1.0 5,700 KB
AN3971: STEVAL-ISV005V2: solar battery charger for lead acid batteries based on the SPV1020 and SEA05
2.0 1,542 KB
AN4217: Designing the SPV1020 with serial and parallel output configurations
1.0 2,480 KB

Design Notes & Tips

Description Version Size
DN0023: Charging a 12V lead acid battery in solar applications with the SPV1020
1.0 698 KB

Presentations & Training Material


Description Version Size
ST products and solutions for solar energy
5.1 2,135 KB

Publications and Collaterals


Description Version Size
SPV1020 Solar boost converter
1.0.0 368 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**
SPV1020NRNDPowerSSO 36Tube-40125_-4.5Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA4881225
Newark Element14Order NowAMERICA4040
Farnell Element14Order NowEUROPE321

(*) 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.