STMicroelectronics SPV1040T

Overview

SPV1040T from STMicroelectronics is a monolithic, low-voltage, solar-optimized step-up DC-DC converter with 0.3 V–5.5 V input range, embedded perturb-and-observe MPPT algorithm, 100 kHz fixed PWM frequency, 120 mΩ N-channel power switch, and 140 mΩ P-channel synchronous rectifier. It delivers up to 3 W output power with 95% peak efficiency for solar battery charging in portable energy-harvesting systems.

For engineers reviewing the SPV1040T datasheet, SPV1040T pinout, SPV1040T application, or SPV1040T equivalent, this device supports precise constant-voltage/constant-current regulation via external resistor dividers and sense resistors, includes reverse polarity protection, thermal shutdown at 155 °C, and soft-start for deeply discharged batteries - critical for solar-powered IoT sensors and wearable medical devices.

Technical Context

The SPV1040T implements a voltage-mode boost topology with integrated N-channel high-side switch and P-channel synchronous rectifier, enabling operation down to 0.3 V input - essential for weak-light solar cell harvesting. Its analog control core monitors MPP-SET (PV voltage), VCTRL (battery voltage feedback), and ICTRL± (current sense) to execute real-time MPPT tracking without external microcontroller intervention.

Burst mode and sleep-in mode dynamically reduce switching activity when output voltage or current reaches regulation limits, minimizing quiescent current (80 µA typ.) and extending runtime in intermittently illuminated environments. Overcurrent protection triggers at 1.8 Apk inductor current, while overtemperature shutdown activates at 155 °C junction temperature with 25 °C hysteresis.

Key Specifications

Pinout & Package

TSSOP8 package (3 mm × 4.4 mm, 1.2 mm height), RoHS-compliant ECOPACK® grade, optimized for thermal dissipation on 2-layer PCBs (R_thj-amb = 135 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar solar MPPT charging applications.

Compared with TPS61200DRCR and MAX17222, the SPV1040T uniquely integrates autonomous MPPT, sub-0.5 V start-up, reverse polarity hardening, and dual-loop battery regulation - eliminating external components and firmware dependencies required by alternatives.

Availability

SPV1040T is available at Aetrix Electronics and suitable for solar battery charging, portable medical instrumentation, and energy-harvesting IoT sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for SPV1040T 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, designing and manufacturing microcontrollers, power management ICs, and analog/mixed-signal solutions for industrial, automotive, and consumer markets.

The SPV1040T belongs to ST's dedicated energy-harvesting product line, engineered specifically for ultra-low-voltage solar and fuel-cell power conversion - prioritizing MPPT autonomy, protection robustness, and minimal external component count.

FAQ

What input voltage range does the SPV1040T support, and why is it significant for solar applications?

The SPV1040T operates from 0.3 V to 5.5 V input, enabling direct interface with single-cell amorphous or crystalline silicon solar panels that generate very low voltages under low-light or partial-shading conditions. This ultra-low start-up threshold eliminates the need for auxiliary boost stages or supercapacitor buffers, reducing system cost and footprint while maximizing energy capture across diverse irradiance profiles.

How does the embedded MPPT algorithm function without external microcontroller support?

The SPV1040T implements a hardware-based perturb-and-observe MPPT engine within its analog-digital core. It continuously samples MPP-SET (PV voltage) and inductor current to adjust PWM duty cycle in real time, requiring no firmware, clock source, or external computation. This autonomous operation ensures deterministic response to irradiance changes and eliminates MCU dependency, simplifying design and improving reliability in remote deployments.

Can the SPV1040T regulate both battery voltage and charge current simultaneously?

Yes - the SPV1040T provides independent constant-voltage (CV) and constant-current (CC) regulation loops. CV is set via a resistor divider on VCTRL referenced to an internal 1.25 V bandgap; CC is set via a sense resistor between ICTRL_PLUS and ICTRL_MINUS, with 50 mV typical offset. Both loops operate concurrently, enabling full-featured lithium battery charging with voltage clamping and current limiting in a single IC.

What thermal and electrical protections are built into the SPV1040T?

The SPV1040T integrates overtemperature shutdown (155 °C turn-off, 130 °C turn-on hysteresis), overcurrent protection (1.8 Apk inductor current limit), input reverse polarity blocking, and undervoltage lockout (0.24 V hysteresis). All protections are hardware-enforced with no software dependency, ensuring fail-safe operation even during transient faults like shorted solar panels or battery overvoltage events.