Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Texas Instruments SM72445MTX/NOPB

Name: SM72445MTX/NOPB
Brand: Texas Instruments
SKU: SM72445MTX/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SM72445MTX/NOPB

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: SM72445MTX/NOPB.pdf

Description:: IC REG CTRLR PHOTOV 1OUT 28TSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,381

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SM72445MTX/NOPB from Texas Instruments is a programmable maximum power point tracking (MPPT) controller for photovoltaic solar systems, integrating an 8-channel 10-bit ADC, four PWM gate drivers for a single-inductor four-switch buck-boost converter, and Panel Mode bypass logic. It operates at 110 kHz, 135 kHz, or 215 kHz switching frequencies with configurable dead time and supports I²C-based configuration and real-time diagnostics. It is used in high-efficiency DC-DC power optimizers for residential and commercial solar modules.

For engineers reviewing the SM72445MTX/NOPB datasheet, SM72445MTX/NOPB pinout, SM72445MTX/NOPB application, or SM72445MTX/NOPB equivalent, key selection considerations include PWM frequency selection via A2 voltage, output voltage/current limit programming via A0/A4, slew rate control via A6, Panel Mode activation logic, and I²C register-level override capability for dynamic runtime reconfiguration.

Technical Context

The SM72445MTX/NOPB implements a digital MPPT algorithm that converges to the maximum power point within ~10 ms using real-time sampling of input/output voltage and current via its integrated 10-bit ADC. Its control architecture supports seamless transitions between buck, boost, and Panel Mode - where the H-bridge operates at half-frequency (1:1 ratio) or disables entirely for dedicated PM switch activation.

It features dual-mode Panel Mode control: hardware-triggered via active-low PM pin or software-configurable via I²C register reg3[4], with PM_OUT delivering a 440 kHz square wave during active Panel Mode. Dead time is dynamically scaled per switching frequency (54 ns at 215 kHz, 87 ns at 135 kHz, 106 ns at 110 kHz), and all PWM outputs are synchronized with precise timing alignment to prevent shoot-through.

Key Specifications

Parameter	Value and Actual Design Meaning
PWM Frequency Options	110 kHz / 135 kHz / 215 kHz - selected by analog voltage on A2 pin; determines efficiency vs. EMI trade-off and dead time (106 ns / 87 ns / 54 ns)
ADC Resolution & Channels	10-bit, 8-channel - measures AVIN, AIIN, AVOUT, AIOUT, and configures VOUT_MAX (A0), PM entry (A2), IOUT_MAX (A4), slew rate (A6)
Panel Mode Activation	Hardware: active-low PM pin (Pin 28); Software: I²C reg3[4]; Output: 440 kHz square wave on PM_OUT (Pin 11) for external FET drive
I²C Interface	Standard-mode (100 kbps) and fast-mode (400 kbps) compatible - supports full register read/write (reg0–reg5), including ADC override and dead time tuning
Operating Temperature	–40°C to +105°C - qualified for outdoor solar inverter and optimizer environments with junction limit up to +125°C
Supply Voltages	VDDA = VDDD = 4.75 V to 5.25 V - separate analog/digital rails with dedicated bypassing (1 µF + 0.1 µF on VDDA; 0.1 µF on VDDD)
Output Protection	Integrated overvoltage (via A0 threshold), overcurrent (via A4 threshold), and soft-start recovery - no external comparator required for basic protection

Pinout & Package

TSSOP-28 package with exposed thermal pad (not electrically connected); 0.65 mm pitch; RoHS-compliant, lead-free (NOPB suffix).

Pin/Terminal	Circuit Role	Design Meaning
RST (1)	Digital reset input	Active-low asynchronous reset - halts all PWM outputs and PM_OUT immediately; requires external pull-up
VDDD (3) / VSSD (4)	Digital supply & ground	5 V digital rail with 0.1 µF ceramic bypass to VSSD; isolated from analog ground to minimize noise coupling
A0–A6 (14,16,17,18,20,21)	Configurable ADC inputs	Set VOUT_MAX (A0), PM mode/frequency (A2), IOUT_MAX (A4), slew rate/startup behavior (A6); sampled at power-up/reset only unless overridden via I²C
PM (28) / PM_OUT (11)	Panel Mode control & output	PM: active-low hardware trigger; PM_OUT: 440 kHz, 5 V square wave during Panel Mode - drives external gate driver for bypass FET
LIA/HIA/HIB/LIB (27,26,25,24)	PWM gate drive outputs	Four synchronous PWM outputs for single-inductor buck-boost topology - LIA/HIA = buck pair; HIB/LIB = boost pair; dead time enforced internally
AVIN/AIIN/AVOUT/AIOUT (15,19,17,21)	Analog sensing inputs	High-impedance (±1 µA leakage) inputs for voltage/current feedback - require external signal conditioning (e.g., current sense amps, resistor dividers)
SCL/SDA/I2C0–I2C2 (8,9,6,7,22)	I²C interface & addressing	SCL/SDA: bidirectional bus; I2C0–I2C2: hardware address pins (3-bit) - enable up to 8 devices on same bus without software address conflict

Key Features

Feature	Design Value
Programmable MPPT Algorithm	Converges to MPP in ≤10 ms under irradiance transients - enables >99% energy harvest retention during fast cloud cover changes
Single-Inductor Four-Switch Topology Support	Eliminates need for separate buck/boost stages - reduces BOM count, magnetics volume, and conduction losses in solar optimizer designs
Hardware + Software Panel Mode Control	Enables direct PV-to-load connection when Vin ≈ Vout - improves peak efficiency up to 99.5% (with SM72295 driver) by bypassing switching losses
I²C Register Override Capability	Allows runtime adjustment of VOUT_MAX, IOUT_MAX, PWM frequency, and dead time without changing external resistors - supports adaptive system tuning
Configurable Soft-Start & Slew Rate Limiting	Soft-start duration (250–500 ms) and output voltage ramp rate (e.g., 10 V/1.2 s) set via A6 - prevents inrush current and stabilizes startup into capacitive loads

Applications

Residential Solar Power Optimizer	Commercial PV String-Level MPPT
Use Scenario: Mounted per-panel in rooftop PV arrays to maximize individual module output under partial shading or soiling. IC Role / Device Role / Timing Role: MPPT controller executing real-time power optimization every 1–2 ms; generates synchronized PWM signals for buck-boost conversion and manages Panel Mode transitions. Use Value: Recovers up to 25% lost yield in shaded conditions versus string inverters; Panel Mode extends efficiency >99% at near-unity voltage ratios.	Use Scenario: Integrated into centralized DC optimizers for multi-module commercial installations with variable irradiance profiles. IC Role / Device Role / Timing Role: Digital core managing four independent buck-boost channels; uses I²C to coordinate with master controller and report telemetry (Vin, Vout, Iin, Iout). Use Value: Enables granular per-string MPPT without adding communication overhead; I²C register access allows remote firmware-adjustable limits.
Utility-Scale Solar Tracker Interface	Battery-Charged PV Microinverter
Use Scenario: Paired with solar trackers to maintain optimal panel angle while dynamically adapting to rapid irradiance shifts during dawn/dusk transitions. IC Role / Device Role / Timing Role: Fast-converging MPPT engine responding to sub-second irradiance changes; Panel Mode activated during low-light periods to reduce standby loss. Use Value: Maintains >98% MPPT efficiency across 0.1–1.0 sun intensity range; eliminates need for auxiliary bias supplies during low-power operation.	Use Scenario: Embedded in microinverters powering off-grid cabins or telecom base stations with hybrid PV/battery sources. IC Role / Device Role / Timing Role: Dual-role controller - performs MPPT during daylight, switches to regulated battery charging mode at night using same buck-boost stage. Use Value: Reduces component count by reusing PWM drivers and sensing paths; I²C registers allow seamless mode transition without hardware reconfiguration.

Residential Solar Power Optimizer

Commercial PV String-Level MPPT

Use Scenario: Mounted per-panel in rooftop PV arrays to maximize individual module output under partial shading or soiling.

IC Role / Device Role / Timing Role: MPPT controller executing real-time power optimization every 1–2 ms; generates synchronized PWM signals for buck-boost conversion and manages Panel Mode transitions.

Use Value: Recovers up to 25% lost yield in shaded conditions versus string inverters; Panel Mode extends efficiency >99% at near-unity voltage ratios.

Use Scenario: Integrated into centralized DC optimizers for multi-module commercial installations with variable irradiance profiles.

IC Role / Device Role / Timing Role: Digital core managing four independent buck-boost channels; uses I²C to coordinate with master controller and report telemetry (Vin, Vout, Iin, Iout).

Use Value: Enables granular per-string MPPT without adding communication overhead; I²C register access allows remote firmware-adjustable limits.

Utility-Scale Solar Tracker Interface

Battery-Charged PV Microinverter

Use Scenario: Paired with solar trackers to maintain optimal panel angle while dynamically adapting to rapid irradiance shifts during dawn/dusk transitions.

IC Role / Device Role / Timing Role: Fast-converging MPPT engine responding to sub-second irradiance changes; Panel Mode activated during low-light periods to reduce standby loss.

Use Value: Maintains >98% MPPT efficiency across 0.1–1.0 sun intensity range; eliminates need for auxiliary bias supplies during low-power operation.

Use Scenario: Embedded in microinverters powering off-grid cabins or telecom base stations with hybrid PV/battery sources.

IC Role / Device Role / Timing Role: Dual-role controller - performs MPPT during daylight, switches to regulated battery charging mode at night using same buck-boost stage.

Use Value: Reduces component count by reusing PWM drivers and sensing paths; I²C registers allow seamless mode transition without hardware reconfiguration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar MPPT controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPPT6010AIPWPR	Fixed 150 kHz PWM; no Panel Mode; 12-bit ADC; integrated MOSFET drivers (no external gate drivers needed)	Targeted at lower-cost, fixed-frequency solar charge controllers - lacks programmable bypass and multi-frequency flexibility	Choose MPPT6010AIPWPR for cost-sensitive, non-bypass applications requiring simpler layout and fewer external components.
UCC28950PWPR	Phase-shifted full-bridge controller; no integrated ADC or MPPT algorithm; requires external MCU for MPPT execution	Used in high-power (>500 W) isolated DC-DC converters - relies on host processor for power optimization logic	Choose UCC28950PWPR when designing isolated, high-voltage solar intermediate bus converters with custom MPPT firmware.

Compared with MPPT6010AIPWPR and UCC28950PWPR, the SM72445MTX/NOPB uniquely integrates MPPT computation, Panel Mode logic, and four-channel PWM generation in a single TSSOP-28 IC - eliminating external MCU dependency while enabling both hardware- and software-triggered efficiency optimization.

Availability

SM72445MTX/NOPB is available at Aetrix Electronics and suitable for residential solar optimizers, commercial PV string controllers, utility-scale tracker interfaces, and battery-charged microinverters requiring stable component supply and long-term lifecycle support.

Supply support for SM72445MTX/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 broad industrial and renewable energy focus.

The SM72445MTX/NOPB belongs to TI's photovoltaic power management product line, designed specifically for high-efficiency, programmable DC-DC optimization in solar energy harvesting systems - emphasizing fast MPPT response, flexible topology support, and field-reconfigurable operation.

FAQ

What is the primary function of the SM72445MTX/NOPB in a solar power system?

The SM72445MTX/NOPB serves as a fully integrated maximum power point tracking (MPPT) controller for photovoltaic systems. It executes real-time MPPT algorithms, generates four synchronized PWM signals for a single-inductor four-switch buck-boost converter, and manages Panel Mode bypass functionality - all within one TSSOP-28 IC. The SM72445MTX/NOPB replaces discrete MCU + gate driver + ADC solutions in solar optimizers, reducing design complexity and improving transient response.

How does the SM72445MTX/NOPB implement Panel Mode, and what are the hardware requirements?

The SM72445MTX/NOPB implements Panel Mode either by pulling the PM pin (Pin 28) low or via I²C register control. During Panel Mode, it outputs a 440 kHz square wave on PM_OUT (Pin 11) to drive an external FET, enabling direct PV-to-load connection. No dedicated bypass switch is required - the H-bridge can be controlled to achieve 1:1 conversion - but using an external FET improves peak efficiency. The SM72445MTX/NOPB itself does not integrate power switches.

Can the SM72445MTX/NOPB's PWM frequency be changed after power-up, and how?

Yes, the SM72445MTX/NOPB's PWM frequency can be changed after power-up using its I²C interface. This requires setting the overide_adcprog bit (reg3[46]) and writing the desired frequency code to A2_override (reg3[42:40]), followed by a bb_reset (reg3[2]) sequence. The SM72445MTX/NOPB retains this setting until next hard reset, allowing dynamic adaptation to changing irradiance or thermal conditions without hardware modification.

What are the critical PCB layout considerations for the SM72445MTX/NOPB's analog and digital sections?

Separate analog (VDDA/VSSA) and digital (VDDD/VSSD) ground planes must be joined at a single point near the SM72445MTX/NOPB. VDDA requires 1 µF + 0.1 µF ceramic bypassing directly to VSSA; VDDD requires 0.1 µF to VSSD. Analog inputs (AVIN, AIIN, etc.) must be routed away from noisy PWM traces and use guard rings if adjacent to digital lines. The SM72445MTX/NOPB's exposed thermal pad should be soldered to a large copper pour for thermal relief but left electrically floating.

Does the SM72445MTX/NOPB support open-loop operation, and when would it be used?

Yes, the SM72445MTX/NOPB supports open-loop operation via the Open Loop bit (reg3[0]). When enabled, it disables MPPT and accepts a fixed duty cycle command via reg3[13:5], useful for bench validation, fault recovery, or integration into systems with external MPPT decision logic. Exiting open-loop mode triggers an internal reset, and the SM72445MTX/NOPB resumes normal ADC-based control - making it suitable for hybrid control architectures.

SM72445MTX/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

SM72445MTX/NOPB FAQ

1.How can I place an order for SM72445MTX/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for SM72445MTX/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 SM72445MTX/NOPB reliable?

The price and inventory of SM72445MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72445MTX/NOPB is usually 5 days.

3.What payment methods are accepted for SM72445MTX/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72445MTX/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SM72445MTX/NOPB?

SM72445MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SM72445MTX/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 SM72445MTX/NOPB?

For technical support, including SM72445MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72445MTX/NOPB requirements.

6.How does Aetrix verify that SM72445MTX/NOPB is sourced from the original manufacturer or authorized distributors?

All SM72445MTX/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 SM72445MTX/NOPB meets industry standards.

7.What is the process for return or replacement of SM72445MTX/NOPB?

All SM72445MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72445MTX/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 SM72445MTX/NOPB part is unused and in its original packaging.

Return procedure for SM72445MTX/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…