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Texas Instruments SM72442X/NOPB
- Part No.:
- SM72442X/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SM72442X/NOPB.pdf
- Description:
- IC REG CTRLR PHOTOV 4OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,285
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Product details
Overview
SM72442X/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, and I²C interface. It supports Panel Mode operation, VOUT overvoltage protection, and over-current protection in TSSOP-28 package for solar optimizer applications.
For engineers reviewing the SM72442X/NOPB datasheet, SM72442X/NOPB pinout, SM72442X/NOPB application, or SM72442X/NOPB equivalent, key selection criteria include its 220 kHz PWM switching frequency, 4.75–5.25 V dual supply range, 12-bit analog input resolution, Panel Mode square-wave output at 400 kHz, and configurable MPPT entry/exit thresholds via ADC channels A0–A6.
Technical Context
The SM72442X/NOPB implements a digital MPPT algorithm that converges to maximum power point within 0.01 s under dynamic irradiance, using real-time sampling of AVIN, AIIN, AVOUT, and AIOUT. Its control logic manages transitions between buck, boost, and Panel Mode with smoothed state switching and digital PWM dithering to enhance effective resolution.
Four independent PWM outputs-LIA, HIA, LIB, HIB-drive external MOSFETs in a 4-switch buck-boost converter. Configuration is performed via resistor dividers on A0 (VOUT_MAX), A2 (Panel Mode timing), A4 (IOUT_MAX), and A6 (slew rate), or through I²C registers reg0–reg5 with 7-byte frame protocol at up to 400 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 220 kHz fixed switching frequency for synchronous gate drive timing and EMI control. |
| ADC Resolution | 12-bit resolution across 8 analog inputs (A0–A7), enabling precise voltage/current sensing with ±1 µA DC leakage. |
| Supply Range | VDDA/VDDD = 4.75–5.25 V; supports stable operation across industrial temperature range (−40°C to +105°C). |
| I²C Interface | Standard-mode (100 kHz) and fast-mode (400 kHz) compatible; address set by I2C0/I2C1/I2C2 pins for up to 7 devices on bus. |
| Panel Mode Output | PM_OUT delivers 400 kHz square wave (5 V amplitude) when PM pin is asserted low, enabling direct panel-level FET drive. |
| Protection Features | Integrated VOUT overvoltage protection, over-current detection via AIOUT/A4 comparison, and soft-start ramp (250 ms). |
| Operating Temp | −40°C to +105°C ambient, with junction temperature rated up to +125°C for outdoor solar deployment. |
Pinout & Package
TSSOP-28 (Package Code PW0028A), thermally enhanced plastic package with 0.65 mm pitch; requires 0.1 µF ceramic bypass on VDDD–VSSD and 1 µF + 0.1 µF on VDDA–VSSA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Digital reset input | Active-low asynchronous reset disabling all PWM outputs and PM_OUT; used for system-level fault recovery. |
| VDDA / VSSA | Analog supply / ground | 5 V analog rail powering ADC and reference; must be decoupled separately from digital domain to minimize noise coupling. |
| VDDD / VSSD | Digital supply / ground | 5 V digital rail powering I²C interface and logic; isolated grounding prevents digital switching noise from corrupting ADC readings. |
| A0, A2, A4, A6 | Configurable ADC inputs | Set max output voltage (A0), Panel Mode timing (A2), max output current (A4), and slew rate (A6) via resistor dividers to 5 V. |
| AVIN, AIIN, AVOUT, AIOUT | Analog sensing inputs | Direct connection points for scaled PV input voltage, input current, output voltage, and output current sensing amplifiers. |
| LIA, HIA, LIB, HIB | PWM gate drive outputs | Four complementary PWM signals controlling low/high-side buck and boost switches in single-inductor 4-switch topology. |
| SCL / SDA | I²C clock/data | Open-drain bidirectional interface requiring external pull-ups (2–10 kΩ); supports register read/write for runtime configuration. |
| PM / PM_OUT | Panel Mode control/output | PM pin forces entry into Panel Mode; PM_OUT provides 400 kHz square wave for external panel-level FET drive during that mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable MPPT Algorithm | Converges to MPP in ≤10 ms under irradiance transients; uses real-time AVIN/AIIN/AVOUT/AIOUT feedback for adaptive duty cycle control. |
| Single-Inductor Buck-Boost Control | Eliminates need for separate buck/boost converters; reduces BOM count and PCB area while supporting VIN < VOUT and VIN > VOUT operation. |
| Panel Mode Diagnostic | Enables direct PV panel connection to power optimizer output; PM_OUT 400 kHz signal drives external FET for panel-level diagnostics or bypass. |
| Configurable Protection Thresholds | VOUT overvoltage and IOUT overcurrent limits set externally via A0/A4 resistors or internally via I²C reg3 vout_max/iout_max fields. |
| Soft-Start & Slew Rate Control | 250 ms voltage ramp on startup; output voltage slew rate adjustable via A6 voltage (slow/fast/no limit) to prevent inrush and stabilize transient response. |
Applications
| Photovoltaic Power Optimizers | Solar Microinverters |
|---|---|
|
Use Scenario: Distributed DC-DC conversion per solar panel to maximize energy harvest under partial shading or mismatched conditions. IC Role / Device Role / Timing Role: Primary MPPT controller generating four synchronized PWM signals for 4-switch buck-boost stage; manages Panel Mode for diagnostic or bypass functions. Use Value: Enables >99.5% peak efficiency in solar optimizer designs when paired with SM72295 driver; eliminates need for external MPPT microcontroller. |
Use Scenario: Integrated DC-AC conversion stage where high-efficiency DC-DC regulation precedes inverter stage in compact microinverter modules. IC Role / Device Role / Timing Role: Regulates intermediate DC bus voltage with fast MPPT response; coordinates with inverter control loop via I²C status registers (reg1). Use Value: Reduces component count and thermal stress by consolidating MPPT, protection, and gate drive control in one IC; supports wide input voltage range (e.g., 20–60 V PV). |
| Utility-Scale Solar String Controllers | Off-Grid Solar Charge Controllers |
|
Use Scenario: Centralized string-level MPPT for commercial rooftop or ground-mount arrays with multiple parallel strings feeding a common DC bus. IC Role / Device Role / Timing Role: Configured as master controller via I²C to coordinate multiple SM72442X/NOPB units; uses reg0/reg5 to synchronize start-up and fault responses. Use Value: Enables scalable architecture with shared communication bus; avoids proprietary firmware development for multi-string coordination. |
Use Scenario: Battery charging systems in remote telecom shelters or rural electrification where PV input varies widely with weather and load demand fluctuates. IC Role / Device Role / Timing Role: Controls buck-boost stage to regulate battery charge voltage/current; enters Panel Mode during overtemperature or overvoltage events to isolate PV source. Use Value: Provides autonomous protection without host MCU intervention; PM pin allows direct connection to thermal sensor for fail-safe shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar MPPT controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX15301 | Integrated 4-switch buck-boost controller with 12-bit ADC, but lacks Panel Mode and dedicated PM_OUT signal; uses SPI instead of I²C. | Targeted at general-purpose DC-DC regulation rather than solar-specific diagnostics; no native support for PV panel-level bypass. | Select MAX15301 only if Panel Mode functionality is unnecessary and SPI interface aligns with existing system architecture. |
| LT8710 | High-voltage 4-switch buck-boost controller with I²C interface and programmable MPPT, but requires external ADC and does not integrate Panel Mode logic. | Designed for wide-input industrial power supplies; lacks built-in PV-specific features like automatic Panel Mode entry based on power variation. | Choose LT8710 when operating beyond 60 V input or needing higher switching frequencies (>1 MHz); accept added design complexity for ADC and logic. |
Compared with MAX15301 and LT8710, the SM72442X/NOPB uniquely integrates Panel Mode with hardware-triggered 400 kHz output, eliminating external logic for solar diagnostic functions, while maintaining full I²C configurability and 220 kHz PWM timing optimized for efficiency in photovoltaic applications.
Availability
SM72442X/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 SM72442X/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 SM72442X/NOPB belongs to TI's photovoltaic controller product line, engineered specifically for high-efficiency, programmable MPPT in solar power optimizers and microinverters - emphasizing reliability under harsh environmental conditions and seamless integration with TI's companion drivers like SM72295.
FAQ
What is the primary function of the SM72442X/NOPB in a solar power system?
The SM72442X/NOPB serves as a programmable maximum power point tracking (MPPT) controller for photovoltaic solar panels. It generates four PWM gate drive signals for a single-inductor 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. Its Panel Mode feature enables direct PV panel connection and diagnostic operation, making it ideal for solar power optimizers and microinverters.
How does the SM72442X/NOPB implement Panel Mode, and what triggers it?
The SM72442X/NOPB enters Panel Mode either when the PM pin is pulled low or automatically after soft-start if no output current exceeds the threshold set on ADC channel A4. Once active, the PM_OUT pin outputs a 400 kHz square wave (5 V amplitude) for driving external panel-level FETs. Entry and exit conditions-including timing duration and power variation thresholds-are configured via voltage levels applied to ADC channel A2, allowing flexible adaptation to different PV panel characteristics and system requirements.
Can the SM72442X/NOPB be configured without external resistors, and how?
Yes, the SM72442X/NOPB supports full runtime configuration via its I²C interface. Critical parameters-including maximum output voltage (vout_max), maximum output current (iout_max), Panel Mode timing, and slew rate-can be written to registers reg0 and reg3, overriding the default resistor-divider settings on pins A0, A2, A4, and A6. This enables dynamic reconfiguration during operation, field calibration, and compatibility with systems lacking space for precision external resistors.
What protection features are integrated into the SM72442X/NOPB?
The SM72442X/NOPB integrates VOUT overvoltage protection, over-current protection triggered by comparing AIOUT voltage against A4 reference, and soft-start with 250 ms output voltage ramp. It also supports forced shutdown via the RST pin and autonomous transition to safe Panel Mode during overtemperature events when PM is tied to an external thermal sensor. These protections operate independently of host processor control, ensuring robustness in unattended solar deployments.
What is the recommended PCB layout practice for minimizing noise in SM72442X/NOPB analog measurements?
To ensure accurate 12-bit ADC performance, separate analog (VDDA/VSSA) and digital (VDDD/VSSD) ground planes must be joined at a single point near the SM72442X/NOPB. AVIN, AIIN, AVOUT, and AIOUT traces should be short, shielded from switching nodes, and routed orthogonally to SCL/SDA lines. Use 0.1 µF ceramic capacitors directly at VDDA–VSSA and VDDD–VSSD pins, and place anti-aliasing RC filters (e.g., 100 Ω + 30 pF) close to each analog input per Figure 9 in the datasheet.
SM72442X/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:
- Obsolete
- Applications:
- Controller, Photovoltaic Solar Panels
- Voltage - Input:
- 4.75V ~ 5.25V
- Number of Outputs:
- 4
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
SM72442X/NOPB FAQ
1.How can I place an order for SM72442X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72442X/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 SM72442X/NOPB reliable?
The price and inventory of SM72442X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72442X/NOPB is usually 5 days.
3.What payment methods are accepted for SM72442X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72442X/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72442X/NOPB?
SM72442X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72442X/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 SM72442X/NOPB?
For technical support, including SM72442X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72442X/NOPB requirements.
6.How does Aetrix verify that SM72442X/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72442X/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 SM72442X/NOPB meets industry standards.
7.What is the process for return or replacement of SM72442X/NOPB?
All SM72442X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72442X/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 SM72442X/NOPB part is unused and in its original packaging.
Return procedure for SM72442X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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