Monolithic Power Systems Inc. MEZS7-SOLARCHARGER

Overview

MEZS7-SOLARCHARGER from Monolithic Power Systems is a complete MPPT solar charging solution module built around the MP2731 I²C-controlled buck charger IC and an ABOV MC96F1206USBN MCU. It delivers up to 4.5A charge current, supports 4.5–16V PV input with 22V sustain capability, integrates NVDC power path and USB OTG, and enables precise MPPT tracking for single-cell Li-ion battery systems in outdoor energy harvesting applications.

For engineers reviewing the MEZS7-SOLARCHARGER datasheet, MEZS7-SOLARCHARGER pinout, MEZS7-SOLARCHARGER application, or MEZS7-SOLARCHARGER equivalent, this module provides validated hardware for rapid prototyping of solar-powered IoT edge devices requiring adaptive input regulation, JEITA-compliant thermal management, and I²C-configurable charge parameters including VBATT_REG (4.2V), IIN_LIM (0.5A), and VIN_MIN (4.5V).

Technical Context

The MEZS7-SOLARCHARGER implements a closed-loop MPPT algorithm via its onboard ABOV MCU, sampling PV voltage and current through the MP2731's integrated 8-bit ADC and dynamically adjusting input regulation to maximize power extraction under variable irradiance. The MP2731 handles all core charging functions-including NVDC path control, reverse-blocking FET operation, and USB OTG boost-while offloading MPPT computation to the MCU.

It operates across 4.5–16V input with 22V absolute maximum rating, regulates battery voltage to 4.2V (I²C-configurable), limits charge current to 1.84A (I²C-configurable), enforces JEITA temperature profiling, and incorporates a configurable safety timer and thermal shutdown. The 1.35MHz switching frequency enables compact magnetics and high efficiency (93% at 9V/5W).

Key Specifications

Availability

MEZS7-SOLARCHARGER is available at Aetrix Electronics and suitable for outdoor IoT systems, solar surveillance cameras, and off-grid lighting applications requiring stable component supply, pre-validated MPPT firmware, and production-ready PCB layout.

Supply support for MEZS7-SOLARCHARGER 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with expertise in DC-DC conversion, battery charging, and motor control solutions for industrial, automotive, and consumer markets.

The MEZS7-SOLARCHARGER belongs to MPS's solar energy reference design portfolio, engineered specifically to accelerate development of reliable, field-deployable solar-charged edge devices with integrated MPPT, NVDC, and USB OTG functionality.

FAQ

What is the role of the onboard MCU in the MEZS7-SOLARCHARGER?

The ABOV MC96F1206USBN MCU executes the MPPT algorithm by reading voltage and current data from the MP2731's ADC, computing optimal operating points, and sending I²C commands to adjust input regulation. It does not handle battery charging directly-the MP2731 manages all power conversion, protection, and NVDC path control independently.

Does the module support multi-cell battery configurations?

No. The MEZS7-SOLARCHARGER is designed exclusively for single-cell Li-ion/Li-polymer batteries with 4.2V regulation. Its power stage, feedback network, and JEITA profile are calibrated for 3.0–4.2V battery voltage range and cannot be reconfigured for 2S or higher stacks without hardware modification.

Can the USB OTG function power external devices?

Yes. The MP2731 provides a regulated 5V boost output (VBUS) capable of delivering up to 1.5A, supporting USB OTG host mode for peripherals such as sensors, flash drives, or BLE modules when the PV input or battery supplies sufficient power.

How is input current limiting implemented?

Input current limit (IIN_LIM = 0.5A default) is enforced by the MP2731 using internal current-sense amplifiers and analog-to-digital conversion. The limit is programmable in 50mA steps via I²C register writes, enabling fine-tuned matching to panel I_SC under varying irradiance conditions.

Is the board RoHS-compliant and halogen-free?

Yes. All components on the MEZS7-SOLARCHARGER-including the MP2731GQC-0001 IC, ABOV MCU, passive components, and PCB-are lead-free, halogen-free, and fully compliant with the EU RoHS Directive, as confirmed in the official MPS green status documentation.

What connectors are used for PV input and battery connection?

The PV input uses a 2-pin 2.54mm pitch header (JP1), while the battery connects via a dedicated 2-pin 2.54mm header (JP2). Both are unshrouded, solder-mount headers compatible with standard 26AWG–22AWG stranded or solid wire; no mating connectors are included.

Does the module include NTC-based battery temperature monitoring?

Yes. The board provides a dedicated NTC_BAT test point and associated biasing circuitry (R8, R9, RT1, RT2) for connecting a standard 10kΩ NTC thermistor. This feeds into the MP2731's JEITA-compliant thermal regulation engine for safe charging across -10°C to +50°C ambient.