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Texas Instruments SM72442MTX/NOPB
- Part No.:
- SM72442MTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SM72442MTX/NOPB.pdf
- Description:
- IC REG CTRLR PHOTOV 1OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
SM72442MTX/NOPB from Texas Instruments is a programmable maximum power point tracking (MPPT) controller for photovoltaic solar panels, integrating an 8-channel 12-bit ADC, four PWM gate drivers for single-inductor buck-boost topology, I²C interface, and proprietary Panel Mode functionality. It operates across –40°C to +105°C, supports up to 99.5% converter efficiency with the SM72295 driver, and delivers real-time input/output voltage/current sensing for adaptive energy harvesting in solar microinverters and power optimizers.
For engineers reviewing the SM72442MTX/NOPB datasheet, SM72442MTX/NOPB pinout, SM72442MTX/NOPB application, or SM72442MTX/NOPB equivalent, key selection criteria include its 220 kHz PWM switching frequency, analog input voltage range of 0–5 V, digital supply tolerance (4.75–5.25 V), TSSOP-28 package compatibility, and configurable MPPT entry/exit thresholds via ADC channels A0/A2/A4/A6.
Technical Context
The SM72442MTX/NOPB implements a digital MPPT algorithm that converges to the maximum power point within 0.01 s, enabling rapid response to irradiance transients. Its control logic integrates soft-start (250 ms ramp), overvoltage protection on VOUT, overcurrent detection via AIIN/AIOUT comparators, and independent Panel Mode activation triggered by PM pin assertion or buck-boost dwell time.
Four dedicated PWM outputs-LIA, HIA, LIB, HIB-drive external MOSFETs in a 4-switch buck-boost configuration, while internal ADC channels monitor AVIN, AVOUT, AIIN, AIOUT, and configure limits via resistor dividers on A0 (VOUT_MAX), A2 (Panel Mode timing), A4 (IOUT_MAX), and A6 (slew rate and boost ratio). I²C communication uses open-drain SDA/SCL with address pins I2C0–I2C2 supporting up to seven devices on one bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 220 kHz fixed switching frequency - determines core magnetics size and EMI profile in solar DC-DC stage. |
| ADC Resolution | 12-bit across 8 channels - enables precise 0.024% full-scale resolution for voltage/current feedback loops. |
| Analog Input Range | 0 V to 5 V (VDDA referenced) - matches standard 5 V bias rails and simplifies sensor interface design. |
| Digital Supply Range | 4.75 V to 5.25 V - ensures stable operation with common LDOs and rejects ripple-induced logic errors. |
| Operating Temperature | –40°C to +105°C - qualified for outdoor photovoltaic environments including rooftop and ground-mount installations. |
| I²C Interface Speed | 100 kHz only - compatible with legacy microcontrollers and avoids timing margin issues in noisy solar systems. |
| Package | TSSOP-28 (PW0028A) - surface-mount footprint with 0.65 mm pitch, suitable for high-density power optimizer PCB layouts. |
Pinout & Package
TSSOP-28 package (Package Number PW0028A), 0.65 mm lead pitch, exposed pad not present, RoHS-compliant Sn finish, MSL Level-3 (260°C peak reflow, 168-hour floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low digital reset | Halts all PWM outputs and resets internal state; required for safe system shutdown or fault recovery. |
| VDDA / VDDD | Analog & digital supply inputs | Separate 5 V supplies with independent bypassing (1 µF + 0.1 µF for VDDA; 0.1 µF for VDDD) prevent noise coupling between sensing and logic domains. |
| AVIN / AVOUT / AIIN / AIOUT | ADC input terminals | Direct connection points for scaled PV input voltage, output voltage, input current, and output current sensing - no external op-amps needed for basic monitoring. |
| A0 / A2 / A4 / A6 | Configurable analog reference inputs | Set maximum output voltage (A0), Panel Mode timing and power threshold (A2), max output current (A4), and slew rate/boost ratio (A6) using resistor dividers to 5 V. |
| LIA / HIA / LIB / HIB | PWM gate drive outputs | Drive low/high-side buck and boost MOSFETs in 4-switch topology - each output rated for 5 V logic swing into capacitive gate loads. |
| PM / PM_OUT | Panel Mode control & indicator | PM pin forces immediate entry into Panel Mode (e.g., thermal shutdown); PM_OUT emits 400 kHz square wave during Panel Mode for external FET driving. |
| SCL / SDA / I2C0–I2C2 | I²C interface & addressing | Open-drain bidirectional bus with hardware-configurable 3-bit slave address (0x1–0x7) - enables multi-device solar string monitoring without software arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary Panel Mode | Enables direct panel connection to power optimizer output via 400 kHz square wave on PM_OUT - eliminates need for separate isolation circuitry during diagnostic or low-power states. |
| Single-inductor buck-boost control | Four PWM outputs (LIA/HIA/LIB/HIB) coordinate seamless transition between buck, boost, and 1:1 modes - reduces BOM count and improves reliability vs. dual-converter architectures. |
| Configurable MPPT entry/exit | Thresholds set via ADC channels A2 and A6 - allows tuning of power variation sensitivity (1.6% or 3.1%), dwell time (0.2–120 s), and hysteresis to match panel IV curve dynamics. |
| Integrated 8-channel 12-bit ADC | Monitors AVIN, AVOUT, AIIN, AIOUT plus four configuration channels - eliminates external ADC and reduces layout complexity in space-constrained solar modules. |
| VOUT overvoltage & overcurrent protection | Hardware-based protection triggered when AVOUT > VREF(A0) or AIOUT > VREF(A4) - responds faster than firmware-based safeguards and prevents catastrophic failure under fault conditions. |
Applications
| Photovoltaic Power Optimizers | Solar Microinverters |
|---|---|
|
Use Scenario: Distributed MPPT per solar module to maximize energy harvest under partial shading or mismatched panel characteristics. IC Role / Device Role / Timing Role: Primary MPPT controller generating synchronized PWM signals for 4-switch buck-boost conversion and managing real-time voltage/current feedback loops. Use Value: Enables >99.5% peak efficiency when paired with SM72295 driver, extends panel lifetime via soft-start and overvoltage clamping, and supports remote configuration via I²C. |
Use Scenario: Compact AC module design where DC-DC stage must operate across wide input (20–60 V) and output (350–450 V) ranges with fast transient response. IC Role / Device Role / Timing Role: Digital MPPT engine executing sub-10 ms convergence and coordinating gate timing to minimize shoot-through risk in high-voltage buck-boost stages. Use Value: Reduces component count by integrating ADC, protection logic, and PWM generation - critical for meeting UL 1741 SA rapid shutdown requirements. |
| Utility-Scale Solar String Controllers | Off-Grid Solar Charge Controllers |
|
Use Scenario: Centralized string-level MPPT with dynamic reconfiguration based on real-time irradiance and temperature data from multiple modules. IC Role / Device Role / Timing Role: Configurable slave node in I²C network, reporting Vin/Vout/Iin/Iout telemetry and accepting updated VOUT_MAX/IOUT_MAX limits from master MCU. Use Value: Supports up to seven SM72442MTX/NOPB devices on one bus using I2C0–I2C2 address pins - simplifies firmware and reduces interconnect wiring in large arrays. |
Use Scenario: Battery charging system for remote telecom or rural electrification, requiring robust operation under extreme temperature swings and variable solar input. IC Role / Device Role / Timing Role: Adaptive DC-DC controller implementing MPPT, battery voltage regulation, and thermal derating via Panel Mode activation on PM pin. Use Value: –40°C to +105°C operating range and integrated overtemperature-safe Panel Mode ensure continuous operation in desert or arctic deployments without external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar MPPT controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8490IMSE#PBF | Integrated 100 V synchronous buck-boost controller with 16-bit ADC; requires external gate drivers; no Panel Mode equivalent. | Targets higher input voltage (up to 100 V) and higher power (>1 kW); lacks direct panel-diagnostic capability. | Select when system requires >60 V input or needs integrated high-side gate drivers - but expect added complexity in Panel Mode implementation. |
| MAX20096ATP/V+T | Automotive-grade 4-switch buck-boost controller with 12-bit ADC; I²C interface; no configurable Panel Mode or MPPT algorithm. | Designed for 12 V/24 V automotive battery charging; lacks solar-specific diagnostics and irradiance-adaptive algorithms. | Choose for vehicle-integrated solar charging where AEC-Q100 qualification is mandatory - but MPPT must be implemented externally in MCU. |
Compared with LT8490IMSE#PBF and MAX20096ATP/V+T, the SM72442MTX/NOPB uniquely combines solar-optimized MPPT convergence (<0.01 s), hardware-accelerated Panel Mode, and full 4-switch PWM coordination in a single TSSOP-28 IC - reducing system latency and eliminating firmware dependency for critical safety functions.
Availability
SM72442MTX/NOPB is available at Aetrix Electronics and suitable for photovoltaic power optimizers, solar microinverters, utility-scale string controllers, and off-grid charge controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SM72442MTX/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of experience in renewable energy IC design and high-reliability manufacturing.
The SM72442MTX/NOPB belongs to TI's photovoltaic controller product line, engineered specifically for high-efficiency, distributed MPPT in solar power optimizers and microinverters - emphasizing fast convergence, integrated protection, and field-configurable operation.
FAQ
What is the primary function of the SM72442MTX/NOPB in a solar power system?
The SM72442MTX/NOPB serves as a programmable maximum power point tracking (MPPT) controller for photovoltaic solar panels. It generates four synchronized PWM signals to drive a 4-switch buck-boost converter, monitors input/output voltage and current via its integrated 8-channel 12-bit ADC, and executes real-time MPPT algorithms to maximize energy harvest - all within a single TSSOP-28 IC. The SM72442MTX/NOPB also supports Panel Mode for diagnostic and low-power states.
How does the SM72442MTX/NOPB implement MPPT, and what is its convergence speed?
The SM72442MTX/NOPB implements MPPT using an advanced digital algorithm that continuously samples AVIN, AIIN, AVOUT, and AIOUT to compute instantaneous power and adjust PWM duty cycle accordingly. Convergence to the maximum power point occurs within 0.01 seconds, enabling rapid adaptation to fast-changing irradiance conditions such as passing clouds. This performance is achieved through dedicated hardware acceleration - not firmware execution - ensuring deterministic response in the SM72442MTX/NOPB.
What are the key configuration pins on the SM72442MTX/NOPB, and how are they used?
The SM72442MTX/NOPB uses analog input pins A0, A2, A4, and A6 to configure critical operating parameters via resistor dividers tied to 5 V: A0 sets maximum output voltage, A2 configures Panel Mode entry/exit timing and power variation thresholds, A4 defines maximum output current limit, and A6 controls output voltage slew rate and starting boost ratio. These pins eliminate the need for external DACs or EEPROM storage, enabling hardware-defined behavior in the SM72442MTX/NOPB.
Does the SM72442MTX/NOPB support I²C communication, and what are its addressing capabilities?
Yes, the SM72442MTX/NOPB features a standard I²C interface with open-drain SDA and SCL pins operating at 100 kHz. Device addressing is configured using three hardware pins - I2C0, I2C1, and I2C2 - allowing up to seven unique addresses (0x1 through 0x7) on a shared bus. This enables scalable multi-device architectures in solar string controllers, where each SM72442MTX/NOPB reports telemetry and accepts updated settings without software address negotiation.
What protection features are integrated into the SM72442MTX/NOPB?
The SM72442MTX/NOPB integrates hardware-based VOUT overvoltage protection (triggered when AVOUT exceeds the voltage set on A0), overcurrent protection (activated when AIOUT exceeds the threshold set on A4), and active reset via the RST pin. It also supports thermal-safe operation through Panel Mode activation on the PM pin, which forces a controlled low-power state. All protections respond independently of firmware, ensuring fail-safe behavior in the SM72442MTX/NOPB even during MCU faults or brownouts.
SM72442MTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SolarMagic™
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Photovoltaic Solar Panels
- Voltage - Input:
- 4.75V ~ 5.25V
- Number of Outputs:
- 1
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
SM72442MTX/NOPB FAQ
1.How can I place an order for SM72442MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72442MTX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM72442MTX/NOPB reliable?
The price and inventory of SM72442MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72442MTX/NOPB is usually 5 days.
3.What payment methods are accepted for SM72442MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72442MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72442MTX/NOPB?
SM72442MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72442MTX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM72442MTX/NOPB?
For technical support, including SM72442MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72442MTX/NOPB requirements.
6.How does Aetrix verify that SM72442MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72442MTX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM72442MTX/NOPB meets industry standards.
7.What is the process for return or replacement of SM72442MTX/NOPB?
All SM72442MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72442MTX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM72442MTX/NOPB part is unused and in its original packaging.
Return procedure for SM72442MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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