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Texas Instruments SM72442MT/NOPB
- Part No.:
- SM72442MT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SM72442MT/NOPB.pdf
- Description:
- IC REG CTRLR PHOTOV 4OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,186
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Product details
Overview
SM72442MT/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 independent PWM gate drivers for single-inductor buck-boost topology, I²C interface, and proprietary Panel Mode operation. It supports 220 kHz PWM switching, operates from –40°C to +105°C, and delivers up to 99.5% converter efficiency when paired with SM72295.
For engineers reviewing the SM72442MT/NOPB datasheet, SM72442MT/NOPB pinout, SM72442MT/NOPB application, or SM72442MT/NOPB equivalent, key selection considerations include its 4-switch buck-boost control architecture, analog input programmability via A0/A2/A4/A6 pins, VOUT overvoltage and overcurrent protection, and TSSOP-28 package compatibility with industrial PV optimizer designs.
Technical Context
The SM72442MT/NOPB implements a digital MPPT algorithm that converges to the maximum power point within 0.01 s under dynamic irradiance, using real-time sampling of AVIN, AIIN, AVOUT, and AIOUT via its integrated 12-bit ADC. Its state machine manages seamless transitions between buck, boost, and Panel Mode based on configurable thresholds set on ADC channels A2 and A6.
It features four dedicated PWM outputs (LIA, HIA, LIB, HIB) with programmable dead time, I²C-configurable registers (reg0–reg5), open-drain SDA/SCL supporting 100 kHz bus speed, and hardware reset (RST) with active-low assertion. Panel Mode activation forces a 400 kHz square wave on PM_OUT for external FET driving, decoupled from main DC-DC regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM frequency | 220 kHz fixed switching frequency - enables high-efficiency, compact magnetics in solar optimizer designs |
| ADC resolution | 12-bit - provides 0.024% full-scale precision for voltage/current sensing and closed-loop MPPT control |
| Operating temp | –40°C to +105°C - qualified for outdoor photovoltaic environments including rooftop and ground-mount installations |
| Supply voltage | 4.75 V to 5.25 V (VDDA/VDDD) - compatible with standard 5 V rail systems and tolerant of solar input fluctuations |
| I²C interface | 100 kHz, 7-bit address with 3-pin configuration (I2C0/I2C1/I2C2) - supports up to 7 devices on shared bus for multi-string PV systems |
| Protection features | VOUT overvoltage, output overcurrent, soft-start, and forced reset - ensures safe startup, fault recovery, and system-level reliability |
| Package | TSSOP-28 (PW0028A) - surface-mount footprint with 0.65 mm pitch, optimized for thermal management in power-dense PV modules |
Pinout & Package
TSSOP-28 package (Package Number PW0028A), 0.65 mm pitch, exposed pad not present, RoHS-compliant Sn lead finish, MSL Level-3 (260°C peak reflow, 168 hr floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Digital reset input | Active-low hardware reset - disables all PWM outputs and PM_OUT immediately upon assertion |
| VDDA / VDDD | Analog & digital supply | Separate 5 V supplies with independent bypassing - minimizes noise coupling between ADC and logic domains |
| A0, A2, A4, A6 | Configurable ADC inputs | Set max output voltage (A0), Panel Mode timing/entry (A2), max output current (A4), slew rate (A6) via resistor dividers |
| LIA, HIA, LIB, HIB | PWM gate drive outputs | Four independent outputs for 4-switch buck-boost - support synchronous rectification and zero-voltage switching |
| PM / PM_OUT | Panel Mode control & signal | PM: active-low entry into Panel Mode; PM_OUT: 400 kHz square wave output for external panel-mode FET drive |
| AVIN, AIIN, AVOUT, AIOUT | Analog sensing inputs | Direct connection to voltage/current sense amplifiers - enable real-time MPPT calculation without external signal conditioning |
| SCL / SDA | I²C interface | Open-drain, 5 V-tolerant - requires external pull-ups (2–10 kΩ); supports register read/write for runtime configuration |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch buck-boost control | Eliminates need for separate buck/boost stages - reduces BOM count, PCB area, and conduction losses in PV optimizers |
| Proprietary Panel Mode | Enables direct PV panel connection to power optimizer output - simplifies system architecture and improves low-light harvesting |
| Configurable MPPT entry/exit thresholds | Programmable via ADC channel A2 - allows adaptive response to irradiance transients and temperature-induced power shifts |
| Hardware-based soft-start | Fixed 250 ms ramp - prevents inrush current during cold start and protects downstream capacitors and MOSFETs |
| Integrated 8-channel 12-bit ADC | Measures AVIN, AIIN, AVOUT, AIOUT plus 4 configuration channels - removes need for external ADC and reduces system latency |
Applications
| Photovoltaic Module Optimizer | String-Level MPPT Converter |
|---|---|
|
Use Scenario: Mounted directly behind individual solar panels to maximize energy harvest under partial shading or mismatched conditions. IC Role / Device Role / Timing Role: Primary MPPT controller generating four synchronized PWM signals to drive external MOSFETs in a single-inductor buck-boost stage. Use Value: Enables >99% conversion efficiency at light loads and fast MPPT convergence (<10 ms), increasing annual energy yield by up to 25% versus string inverters. |
Use Scenario: Integrated into commercial rooftop PV systems where per-string optimization replaces centralized inverter MPPT. IC Role / Device Role / Timing Role: Digital control core managing input/output voltage/current sensing, I²C communication with central controller, and fault-safe shutdown. Use Value: Supports daisy-chained I²C addressing (up to 7 units) and real-time telemetry via reg1, enabling predictive maintenance and remote firmware updates. |
| Off-Grid Solar Charge Controller | Portable Solar Generator Interface |
|
Use Scenario: Used in battery-charging DC-DC converters for telecom base stations or rural microgrids with variable solar input. IC Role / Device Role / Timing Role: Regulates charging voltage/current while enforcing battery-specific profiles via programmable A0/A4 thresholds and overvoltage protection. Use Value: Built-in VOUT overvoltage and overcurrent protection eliminates need for external supervision ICs, reducing failure points in harsh environments. |
Use Scenario: Embedded in portable solar generators to manage power flow between foldable PV panels, Li-ion battery packs, and USB/AC outputs. IC Role / Device Role / Timing Role: Panel Mode activation triggered by external temperature sensor on PM pin - throttles output during thermal stress to preserve battery lifespan. Use Value: PM_OUT 400 kHz square wave drives external FET without software intervention - ensures fail-safe thermal derating even during MCU lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar MPPT controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7310MHE/NOPB | Integrated gate driver + current sense amplifier; no built-in ADC or Panel Mode; 3.3 V logic interface | Requires external ADC and microcontroller for MPPT algorithm; suited for cost-sensitive, lower-power (<100 W) solar chargers | Choose LM7310MHE/NOPB when system already includes a host MCU and needs only analog power stage control. |
| UCC28950PW | Phase-shifted full-bridge controller; no native MPPT algorithm; relies on external processor for power tracking | Targeted at high-power (>500 W), isolated DC-DC topologies; lacks PV-specific features like Panel Mode or AVIN/AIIN sensing | Choose UCC28950PW for transformer-isolated solar inverters requiring ZVS and high-voltage isolation, not module-level optimization. |
Compared with LM7310MHE/NOPB and UCC28950PW, the SM72442MT/NOPB uniquely integrates MPPT computation, 4-switch buck-boost gate drive, and Panel Mode in a single TSSOP-28 IC - eliminating external processors and reducing bill-of-materials for distributed PV optimization.
Availability
SM72442MT/NOPB is available at Aetrix Electronics and suitable for photovoltaic module optimizers, string-level MPPT converters, off-grid solar charge controllers, and portable solar generator interfaces requiring stable component supply across extended product lifecycles.
Supply support for SM72442MT/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.
The SM72442MT/NOPB belongs to TI's photovoltaic controller product line, engineered specifically for high-efficiency, distributed MPPT in residential and commercial solar modules - emphasizing reliability, programmability, and integration density.
FAQ
What is the primary function of the SM72442MT/NOPB in a solar power system?
The SM72442MT/NOPB serves as a fully integrated maximum power point tracking (MPPT) controller for photovoltaic solar panels. It generates four synchronized PWM signals to drive a 4-switch buck-boost converter, samples input/output voltage and current via its internal 12-bit ADC, executes real-time MPPT algorithms, and supports Panel Mode for direct panel connection. The SM72442MT/NOPB enables >99% conversion efficiency and sub-10 ms MPPT convergence without requiring an external microcontroller.
How does the SM72442MT/NOPB implement Panel Mode, and what triggers it?
Panel Mode in the SM72442MT/NOPB is activated either by pulling the PM pin low or automatically after soft-start when configured thresholds on ADC channel A2 are met. When active, the SM72442MT/NOPB outputs a 400 kHz square wave on PM_OUT to drive an external FET, bypassing normal buck-boost regulation. This mode allows direct connection of the PV panel to the optimizer output, improving low-light performance and simplifying system architecture. The SM72442MT/NOPB remains in Panel Mode for a user-defined duration (set via A6) before resuming MPPT.
Can the SM72442MT/NOPB be configured without an external microcontroller?
Yes, the SM72442MT/NOPB supports standalone operation using analog configuration pins (A0, A2, A4, A6) with resistor dividers to set maximum output voltage, current limits, Panel Mode timing, and slew rate. Its I²C interface (SCL/SDA) is optional and used only for advanced runtime adjustments, telemetry, or multi-device synchronization. All core MPPT functionality, including soft-start, fault protection, and mode transitions, operates autonomously once powered - no external MCU is required for basic SM72442MT/NOPB deployment.
What are the absolute maximum ratings for the analog and digital supplies of the SM72442MT/NOPB?
The SM72442MT/NOPB has an absolute maximum analog supply voltage (VDDA – VSSA) of –0.3 V to +6.0 V and digital supply voltage (VDDD – VSSD) of –0.3 V to VA + 0.3 V (max +6.0 V). Recommended operating range is +4.75 V to +5.25 V for both VDDA and VDDD. Exceeding these limits may cause permanent damage. The SM72442MT/NOPB also specifies ±10 mA maximum input current per pin and –65°C to +150°C storage temperature. These ratings ensure robustness in outdoor PV environments where supply rails may experience transient overvoltage.
Does the SM72442MT/NOPB support daisy-chained I²C communication for multi-module systems?
Yes, the SM72442MT/NOPB supports daisy-chained I²C communication using three hardware address pins (I2C0, I2C1, I2C2), allowing up to seven devices on a single bus. Each device is assigned a unique 7-bit address (0x1–0x7) determined by the logic states on those pins. The SM72442MT/NOPB uses 7-byte register frames (56 bits) and supports 100 kHz data rate, enabling coordinated monitoring and configuration across multiple PV modules - critical for string-level optimization and centralized telemetry in commercial solar installations.
SM72442MT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SolarMagic™
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
SM72442MT/NOPB FAQ
1.How can I place an order for SM72442MT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72442MT/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 SM72442MT/NOPB reliable?
The price and inventory of SM72442MT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72442MT/NOPB is usually 5 days.
3.What payment methods are accepted for SM72442MT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72442MT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72442MT/NOPB?
SM72442MT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72442MT/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 SM72442MT/NOPB?
For technical support, including SM72442MT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72442MT/NOPB requirements.
6.How does Aetrix verify that SM72442MT/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72442MT/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 SM72442MT/NOPB meets industry standards.
7.What is the process for return or replacement of SM72442MT/NOPB?
All SM72442MT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72442MT/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 SM72442MT/NOPB part is unused and in its original packaging.
Return procedure for SM72442MT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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