STMicroelectronics STEVAL-ISV015V1

Overview

STEVAL-ISV015V1 from STMicroelectronics is an evaluation board for the SPV1040 monolithic solar MPPT step-up converter IC, designed to demonstrate high-efficiency energy harvesting from low-voltage photovoltaic sources (0.3 V–5.5 V input). It implements embedded perturb-and-observe MPPT, 100 kHz fixed-frequency PWM, and provides regulated output voltage/current with overcurrent (1.8 Apk), overtemperature (155 °C shutdown), and reverse-polarity protection in a TSSOP8 package.

For engineers reviewing the STEVAL-ISV015V1 datasheet, STEVAL-ISV015V1 pinout, STEVAL-ISV015V1 application, or STEVAL-ISV015V1 equivalent, this board enables rapid validation of solar battery charging performance in portable electronics, IoT sensors, and low-power embedded systems under real-world irradiance and load conditions.

Technical Context

The STEVAL-ISV015V1 implements the full reference design for the SPV1040 DC-DC converter, including external components required for MPPT operation: MPP-SET sensing network, VCTRL voltage feedback divider, ICTRL+/- current-sense resistor, LX inductor (10–100 µH), and input/output capacitors. It supports start-up from as low as 0.3 V input and transitions through soft-start, start-up, MPPT, burst, and sleep-in modes based on PV voltage, output load, and thermal state.

Its analog control architecture integrates constant-voltage regulation via internal 1.25 V reference and external resistor divider, constant-current regulation using a precision current-sense amplifier, and digital MPPT logic that dynamically adjusts duty cycle to maximize power transfer - all without requiring external microcontroller intervention.

Key Specifications

Availability

STEVAL-ISV015V1 is available at Aetrix Electronics and suitable for solar-powered portable media players, wireless sensor nodes, GPS trackers, and battery-backed IoT edge devices requiring stable component supply and validated energy harvesting performance.

Supply support for STEVAL-ISV015V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive-grade ICs with strong focus on energy efficiency and industrial reliability.

The SPV1040 product line - implemented on STEVAL-ISV015V1 - targets ultra-low-voltage energy harvesting applications where traditional converters fail, enabling battery charging directly from miniature solar cells in space-constrained, maintenance-free systems.

FAQ

What input source types are supported by the STEVAL-ISV015V1?

The board is optimized for photovoltaic panels and fuel cells delivering 0.3 V–5.5 V DC, including single-junction amorphous silicon, dye-sensitized, or organic solar cells. It is not intended for standard 12 V or 24 V solar arrays, which require additional front-end buck or isolation stages before connecting to the SPV1040 input.

Can the output voltage be adjusted beyond the default 4.2 V battery charge level?

Yes - output voltage is set by the external VCTRL resistor divider. With VMPP-SET ≥ 1.5 V, the SPV1040 supports 2 V–5.2 V output; however, outputs above 4.8 V require adding an external Schottky diode between LX and VOUT to bypass the internal PMOS body diode voltage drop, as specified in DS6991 Rev 10 Section 4 Note 1.

Does the STEVAL-ISV015V1 support constant-current charging profiles for Li-ion batteries?

Yes - constant-current regulation is implemented via the ICTRL+ and ICTRL− pins using an external sense resistor. The SPV1040 compares the voltage across this resistor to an internal 50 mV offset threshold, enabling precise programmable current limits up to 1.8 A peak, suitable for CC/CV lithium battery charging sequences.

How does the board handle partial shading or rapidly changing light conditions?

The embedded perturb-and-observe MPPT algorithm continuously samples input voltage and current every PWM cycle, adjusting duty cycle in small increments to track the shifting maximum power point. This allows stable operation during cloud transients or indoor/outdoor transitions without external firmware or host processor involvement.