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Texas Instruments SM72442MTE/NOPB
- Part No.:
- SM72442MTE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SM72442MTE/NOPB.pdf
- Description:
- IC REG CTRLR PHOTOV 1OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
SM72442MTE/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 (LIA/HIA/HIB/LIB) for single-inductor four-switch buck-boost topology, and I²C interface for real-time configuration. It supports Panel Mode operation with 400 kHz PM_OUT square wave output and delivers MPPT convergence in ≤10 ms under irradiance transients.
For engineers reviewing the SM72442MTE/NOPB datasheet, SM72442MTE/NOPB pinout, SM72442MTE/NOPB application, or SM72442MTE/NOPB equivalent, key selection considerations include its TSSOP-28 package, 220 kHz PWM switching frequency, 5 V analog/digital supply compatibility, -40°C to +105°C operating range, and integrated overvoltage/overcurrent protection logic.
Technical Context
The SM72442MTE/NOPB implements a digital MPPT algorithm that continuously monitors AVIN/AIIN (input voltage/current) and AVOUT/AIOUT (output voltage/current) via its 12-bit ADC to dynamically adjust PWM duty cycles across all four gate outputs. Its proprietary Panel Mode enables direct connection of PV panels to power optimizer circuits without intermediate DC-DC stages.
Control is configurable through both analog resistor dividers on A0/A2/A4/A6 pins and I²C registers (reg0–reg5), supporting real-time adjustment of VOUT_MAX, IOUT_MAX, slew rate, soft-start duration, and MPPT entry/exit thresholds. The device operates at fixed 220 kHz PWM frequency with dead-time control (tdon/tdoff) and supports open-loop duty-cycle command via reg3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 220 kHz fixed switching frequency - determines converter size, efficiency trade-off, and EMI profile in solar DC-DC designs. |
| ADC Resolution | 12-bit - provides 0.244 mV LSB resolution at 5 V reference for precise input/output voltage and current sensing. |
| Operating Temp | -40°C to +105°C - qualified for outdoor photovoltaic installations and industrial-grade power optimizer environments. |
| Supply Voltage | 4.75 V to 5.25 V for both VDDA and VDDD - ensures stable analog reference and digital logic operation under wide-input solar bus conditions. |
| I²C Interface | Standard-mode (100 kHz) with 3-pin address selection (I2C0/I2C1/I2C2) - enables up to 7 devices on one bus for multi-string solar array monitoring. |
| Protection Features | VOUT overvoltage and overcurrent detection - implemented in hardware with hysteresis thresholds set via A4/A0, enabling autonomous fault response without MCU intervention. |
| Package | TSSOP-28 (PW0028A) - surface-mount footprint compatible with automated assembly and thermal management in compact power optimizer modules. |
Pinout & Package
TSSOP-28 (Package Code PW0028A), 0.65 mm pitch, 9.7 mm × 4.4 mm body, exposed pad not present. Thermal resistance θJA = 110°C/W (JEDEC standard board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Digital reset input | Active-low asynchronous reset - disables all PWM outputs and PM_OUT immediately; used for system-level fault recovery. |
| VDDA / VDDD | Analog & digital supply | Separate 5 V supplies with independent bypassing - minimizes noise coupling between ADC reference and digital logic domains. |
| AVIN / AIIN / AVOUT / AIOUT | ADC sensing inputs | High-impedance analog inputs (±1 µA leakage) - accept scaled PV input/output voltages and currents via external resistive dividers or current-sense amplifiers. |
| A0 / A2 / A4 / A6 | Configurable ADC channels | Set VOUT_MAX (A0), Panel Mode timing/power thresholds (A2), IOUT_MAX (A4), and slew rate/startup behavior (A6) via resistor dividers - eliminates need for external EEPROM or MCU calibration. |
| LIA / HIA / HIB / LIB | PWM gate drive outputs | Four independent CMOS outputs driving external MOSFETs in buck-boost topology - support synchronous rectification and zero-voltage switching with programmable dead time. |
| PM / PM_OUT | Panel Mode control & signal | PM: active-low hardware entry into Panel Mode; PM_OUT: 400 kHz, 5 V square wave during Panel Mode - drives external transformer-coupled FET for panel diagnostics or bypass functions. |
| SDA / SCL | I²C bidirectional interface | Open-drain outputs requiring external pull-ups - enable register read/write access to reg0–reg5 for runtime tuning of MPPT parameters and fault logging. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch buck-boost control | Eliminates need for separate buck/boost converters - reduces BOM count, PCB area, and magnetic component count in solar power optimizers. |
| Proprietary Panel Mode | Enables direct PV panel connection to output stage - simplifies architecture for module-integrated electronics (MIE) and enables rapid panel diagnostics without full DC-DC conversion. |
| Hardware-based MPPT with ≤10 ms convergence | Autonomous tracking without host processor - maintains peak harvest under fast cloud transients and partial shading conditions typical in rooftop PV systems. |
| Integrated 8-channel 12-bit ADC | Measures AVIN, AIIN, AVOUT, AIOUT plus 4 configuration channels - replaces external ADC and reduces signal chain complexity and error sources. |
| I²C-configurable thresholds and timing | Runtime adjustment of VOUT_MAX, IOUT_MAX, slew rate, and MPPT hysteresis - supports field calibration and adaptive operation across varying panel IV curves and temperature profiles. |
Applications
| Photovoltaic Power Optimizers | Solar Microinverters |
|---|---|
|
Use Scenario: Mounted behind individual PV modules to maximize energy harvest per panel under mismatched conditions (shading, soiling, aging). IC Role / Device Role / Timing Role: Primary MPPT controller generating four synchronized PWM signals to drive buck-boost power stage; executes real-time IV curve scanning and duty-cycle optimization. Use Value: Enables >99% MPPT efficiency and <10 ms dynamic response - directly increases annual energy yield by 15–25% compared to string inverters in non-uniform irradiance. |
Use Scenario: Integrated into AC-module designs where DC-DC conversion and inversion occur within single enclosure per panel. IC Role / Device Role / Timing Role: Controls DC-DC stage preceding inverter H-bridge; manages startup sequencing, soft-start ramp, and overvoltage/overcurrent shutdown coordination. Use Value: Reduces system-level component count by consolidating MPPT, sensing, and protection logic - lowers bill-of-materials cost and improves reliability vs. discrete controller + ADC + comparator solutions. |
| Smart PV Monitoring Systems | Off-Grid Solar Charge Controllers |
|
Use Scenario: Embedded in smart junction boxes for real-time performance analytics, fault detection (open-circuit, short-circuit, PID), and remote firmware updates. IC Role / Device Role / Timing Role: Provides high-accuracy voltage/current telemetry via ADC channels and I²C register reads; triggers Panel Mode for diagnostic current injection. Use Value: Delivers ±0.5% full-scale measurement accuracy with built-in offset calibration (reg4) - eliminates need for external precision references or calibration routines. |
Use Scenario: Used in battery-charging DC-DC converters for RV, marine, and telecom backup systems where input voltage varies widely (18–60 V) and battery voltage must be tightly regulated. IC Role / Device Role / Timing Role: Implements adaptive MPPT and constant-current/constant-voltage charging profiles using A4-set IOUT_MAX and A0-set VOUT_MAX thresholds. Use Value: Supports dual-mode operation (MPPT + CV/CC) with seamless transition - extends battery life and prevents overcharge in variable solar input conditions. |
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 | Fixed 2 MHz switching frequency; integrated boost controller only (no buck-boost); requires external MOSFET drivers. | Targeted at low-power (<100 W) solar chargers; lacks Panel Mode and 4-switch topology support. | Choose LT8490 for cost-sensitive, low-power battery charging where buck-boost flexibility is unnecessary. |
| MAX17643ATP+T | 4-switch buck-boost controller with 2.2 MHz operation; no integrated ADC; relies on external voltage/current sense ICs and MCU for MPPT. | Requires full external microcontroller and sensing subsystem - increases design complexity and BOM count. | Choose MAX17643 when higher switching frequency and tighter layout constraints outweigh integrated ADC and autonomous MPPT benefits. |
Compared with LT8490IMSE#PBF and MAX17643ATP+T, the SM72442MTE/NOPB uniquely integrates 12-bit ADC, Panel Mode, and four PWM outputs in a single TSSOP-28 package - reducing system-level components, eliminating MCU dependency for basic MPPT, and enabling direct PV diagnostics without additional circuitry.
Availability
SM72442MTE/NOPB is available at Aetrix Electronics and suitable for photovoltaic power optimizers, solar microinverters, smart PV monitoring systems, and off-grid solar charge controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SM72442MTE/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 automotive-grade reliability validation.
The SM72442 belongs to TI's photovoltaic controller product line, engineered specifically for high-efficiency, autonomous MPPT in module-level power electronics - emphasizing integration, field configurability, and robustness in harsh outdoor environments.
FAQ
What is the primary function of the SM72442MTE/NOPB in a solar power system?
The SM72442MTE/NOPB serves as a fully autonomous maximum power point tracking (MPPT) controller for photovoltaic solar panels. It continuously samples input/output voltage and current via its integrated 12-bit ADC, computes optimal operating points, and generates four synchronized PWM signals to drive a single-inductor four-switch buck-boost converter. This enables >99% MPPT efficiency and sub-10 ms dynamic response without requiring an external microcontroller.
How does the Panel Mode feature work on the SM72442MTE/NOPB?
Panel Mode on the SM72442MTE/NOPB is activated either by pulling the PM pin low or automatically after soft-start when configured via ADC channel A2. During Panel Mode, the SM72442MTE/NOPB asserts a 400 kHz, 5 V square wave on PM_OUT - intended to drive an external transformer-coupled FET for panel diagnostics or bypass functions. This mode allows direct PV panel connection to the output stage without full DC-DC conversion.
Can the SM72442MTE/NOPB operate without external microcontroller intervention?
Yes, the SM72442MTE/NOPB is designed for autonomous operation. Its embedded digital MPPT algorithm, hardware-based overvoltage/overcurrent protection, and analog configuration pins (A0/A2/A4/A6) allow full functionality without any external MCU. I²C communication is optional and used only for advanced runtime tuning or telemetry - not required for basic MPPT, startup, or fault handling.
What are the key electrical specifications of the SM72442MTE/NOPB ADC subsystem?
The SM72442MTE/NOPB features an 8-channel, 12-bit successive-approximation ADC with 5 V reference (VDDA). Input channels AVIN, AIIN, AVOUT, and AIOUT support 0–5 V range with ±1 µA leakage and 33 pF track-mode input capacitance. The ADC delivers 0.244 mV LSB resolution and is used for real-time sensing and threshold comparison - critical for MPPT calculation and protection triggering.
What package type and thermal characteristics apply to the SM72442MTE/NOPB?
The SM72442MTE/NOPB is housed in a TSSOP-28 package (TI package code PW0028A), measuring 9.7 mm × 4.4 mm with 0.65 mm lead pitch. It has a JEDEC-standard thermal resistance θJA of 110°C/W on a 2-layer board and is rated for -40°C to +105°C operating temperature - validated for outdoor photovoltaic applications and industrial power optimizer modules.
SM72442MTE/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
SM72442MTE/NOPB FAQ
1.How can I place an order for SM72442MTE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72442MTE/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 SM72442MTE/NOPB reliable?
The price and inventory of SM72442MTE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72442MTE/NOPB is usually 5 days.
3.What payment methods are accepted for SM72442MTE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72442MTE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72442MTE/NOPB?
SM72442MTE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72442MTE/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 SM72442MTE/NOPB?
For technical support, including SM72442MTE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72442MTE/NOPB requirements.
6.How does Aetrix verify that SM72442MTE/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72442MTE/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 SM72442MTE/NOPB meets industry standards.
7.What is the process for return or replacement of SM72442MTE/NOPB?
All SM72442MTE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72442MTE/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 SM72442MTE/NOPB part is unused and in its original packaging.
Return procedure for SM72442MTE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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