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Texas Instruments LM2676SX-3.3/NOPB
- Part No.:
- LM2676SX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676SX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:633
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Product details
Overview
LM2676SX-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output current with fixed 3.3V output, 8–40V input range, 260kHz fixed-frequency operation, and ±2% output voltage tolerance over –40°C to 125°C junction temperature. It integrates a 150mΩ DMOS high-side switch and supports ON/OFF control for low-power standby mode in industrial power supplies.
For engineers reviewing the LM2676SX-3.3/NOPB datasheet, LM2676SX-3.3/NOPB pinout, LM2676SX-3.3/NOPB application, or LM2676SX-3.3/NOPB equivalent, key selection criteria include verified 3A continuous output capability, thermal performance in TO-263-7 (KTW) package, efficiency ≥86% at 12VIN/3A, and compatibility with standard off-the-shelf inductors and Schottky diodes per TI's recommended design flow.
Technical Context
The LM2676SX-3.3/NOPB implements a fixed-frequency PWM buck controller with internal 260kHz oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses a precision 1.21V reference (VFB) internally connected to set 3.3V output - eliminating external resistors - and maintains regulation via duty-cycle adjustment proportional to VOUT/VIN.
It operates across 8–40V input and delivers regulated 3.3V ±2% over full load (100mA–3A) and temperature (–40°C to 125°C), with built-in thermal shutdown, cycle-by-cycle current limiting (4.5A typ), and 50µA standby quiescent current when ON/OFF pin is pulled low. The KTW (TO-263-7) package enables high-current PCB mounting with exposed thermal pad tied to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234–3.366V) over full line/load/temperature - ensures stable logic rail compliance without external feedback divider. |
| Max Output Current | 3A continuous - supports mid-power embedded systems without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates wide-input industrial, metering, and motor drive bus voltages. |
| Switching Frequency | 260kHz fixed - enables use of compact, standardized inductors and reduces EMI compared to lower frequencies. |
| Efficiency | ≥86% at 12VIN/3A - minimizes thermal dissipation in enclosed enclosures and extends system uptime. |
| Quiescent Current | 50µA in shutdown (ON/OFF = 0V) - critical for battery-backed or energy-harvesting applications requiring ultra-low standby drain. |
| RDS(ON) | 150mΩ (typ) - reduces conduction loss and improves full-load efficiency versus higher-RDS(ON) alternatives. |
| Operating Temp | –40°C to +125°C junction - validated for harsh environments including electricity meters and motor control cabinets. |
Pinout & Package
LM2676SX-3.3/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), featuring an exposed metal tab electrically and thermally connected to GND for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | High-side DMOS drain node - connects directly to inductor and Schottky diode cathode; switches between VIN and ~–0.4V during OFF-time. |
| 2 (VIN) | Input supply | Main power input (8–40V); requires low-ESR bypass capacitor placed adjacent to minimize high-frequency ringing. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor - provides gate-drive voltage >VIN to fully enhance internal MOSFET. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and IC substrate; must be tied to large copper area and exposed tab. |
| 5 (NC) | No connect | Internally unconnected - leave floating; no routing or soldering required. |
| 6 (FB) | Feedback input | Internally tied to 3.3V output - direct connection to output capacitor ensures accurate regulation without external resistors. |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V = active regulation; ≤0.8V = shutdown (50µA IQ); internal 20µA pull-up allows open-circuit enable. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external high-side FET and driver, reducing BOM count and layout complexity while maintaining >86% efficiency at full load. |
| Fixed 3.3V output with internal feedback | Removes external resistor divider - improves accuracy, reduces component count, and avoids drift-related output error. |
| 260kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent use of industry-standard inductors (e.g., Renco, Pulse, Coilcraft) without frequency tuning. |
| Thermal shutdown & current limit | Protects against sustained overload or poor heatsinking - automatically recovers after fault removal without latch-up or manual reset. |
| ON/OFF pin with 50µA shutdown | Supports system-level power sequencing and low-energy sleep modes - compatible with microcontroller GPIO without level-shifting. |
| WEBENCH® Power Designer support | Generates complete schematics, bill-of-materials, and performance simulations - accelerates design validation and reduces prototyping iterations. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and interface circuitry in cellular or LoRaWAN communication modules operating from 12–24V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and memory - replaces discrete DC-DC solutions with integrated control and power switch. Use Value: Delivers clean, regulated 3.3V at up to 3A with <1% ripple, meeting stringent noise requirements for RF-sensitive analog front-ends. | Use Scenario: Provides isolated 3.3V rail for metrology ASIC, real-time clock, and display drivers in Class 0.5S electricity meters with wide AC-DC input variation. IC Role / Device Role / Timing Role: Main system regulator handling brownout conditions and long-term reliability under 85°C ambient - leverages ±2% tolerance and –40°C to 125°C rating. Use Value: Maintains regulation across 8–40V input swings caused by rectified AC line fluctuations, ensuring metrology accuracy during voltage sags. |
| Calling Button Panel | Motor Drive Auxiliary Supply |
Use Scenario: Supplies 3.3V to microcontroller, touch sensor, and LED indicators in building intercom or elevator call panels powered from 24V DC distribution. IC Role / Device Role / Timing Role: Compact, thermally robust local regulator - mounted directly on panel PCB with minimal heatsinking due to TO-263 thermal pad. Use Value: Enables reliable operation in non-ventilated enclosures with peak efficiency >86%, minimizing self-heating during extended button-press events. | Use Scenario: Generates 3.3V for gate driver logic, current sense amplifiers, and MCU in 24V/48V BLDC motor drives where space and thermal management are constrained. IC Role / Device Role / Timing Role: Secondary bias supply decoupled from noisy motor power stage - benefits from dedicated GND pin and low-noise FB path. Use Value: Withstands motor-induced voltage transients up to 45V (abs max) and sustains regulation during PWM-induced input dips via robust input capacitor support. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675MX-3.3/NOPB | 1.5A output current, same 260kHz frequency and 3.3V fixed output - lower current rating and reduced thermal capability in TO-263. | Suitable only for sub-1.5A loads; not viable for 3A motor drive or metering applications requiring full-rated current. | Select when board space or cost constraints justify lower current capacity and simplified thermal design. |
| LMR51430RNXR | 3A synchronous buck with 4.5–36V input, 500kHz/1.1MHz selectable frequency, and integrated high-/low-side FETs - no external diode required. | Higher efficiency (>92% typical), smaller solution size, but requires external compensation and lacks pin compatibility. | Choose for new designs prioritizing efficiency and footprint reduction - not a drop-in replacement due to different pinout and control architecture. |
Compared with LM2676SX-3.3/NOPB, LM2675MX-3.3/NOPB offers identical topology and ease-of-use but halves output current capability, while LMR51430RNXR delivers superior efficiency and integration at the cost of design complexity and non-interchangeable layout - making LM2676SX-3.3/NOPB optimal for legacy-compatible, thermally demanding 3A applications.
Availability
LM2676SX-3.3/NOPB is available at Aetrix Electronics and suitable for electricity metering, motor drive auxiliary power, and industrial communication modules requiring stable component supply, long-lifecycle availability, and proven thermal performance in TO-263 packaging.
Supply support for LM2676SX-3.3/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 expertise in high-reliability power conversion ICs.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers needing robust, easy-to-implement buck regulators with minimal external components and broad industrial temperature support.
FAQ
What is the maximum continuous output current of the LM2676SX-3.3/NOPB?
The LM2676SX-3.3/NOPB is rated for 3A continuous output current under recommended operating conditions (TJ ≤ 125°C, adequate PCB copper area). This is verified across the full –40°C to 125°C junction temperature range and supported by its 150mΩ RDS(ON) and thermal design in the KTW package. Derating applies above 85°C ambient depending on layout and airflow.
Does the LM2676SX-3.3/NOPB require external feedback resistors?
No, the LM2676SX-3.3/NOPB does not require external feedback resistors. It features an internally trimmed 3.3V output with the feedback node (FB pin) pre-connected to the internal voltage divider - users simply tie FB directly to the output capacitor. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like the LM2676-ADJ.
What package type is used for the LM2676SX-3.3/NOPB?
The LM2676SX-3.3/NOPB is packaged in the KTW variant: a 7-pin TO-263 (D²PAK) surface-mount package with an exposed thermal pad. Its dimensions are 10.1mm × 15.24mm, and the tab is electrically connected to GND - requiring direct soldering to a large PCB copper pour for optimal thermal performance and electrical stability.
How does the ON/OFF pin function on the LM2676SX-3.3/NOPB?
The ON/OFF pin (Pin 7) enables logic-level control of the LM2676SX-3.3/NOPB: applying ≥1.4V activates regulation, while ≤0.8V places it in shutdown with 50µA standby current. An internal 20µA pull-up allows operation with an open-circuit pin. The pin tolerates up to 6V and includes a 7V Zener clamp - supporting direct interfacing with 3.3V or 5V microcontrollers without external circuitry.
What is the typical efficiency of the LM2676SX-3.3/NOPB at full load?
At 12V input and 3A output, the LM2676SX-3.3/NOPB achieves ≥86% typical efficiency, as specified in Section 5.5 of the datasheet. This value reflects real-world performance with standard external components (e.g., 33µH inductor, Schottky diode, low-ESR capacitors) and accounts for conduction losses in the 150mΩ internal switch and switching losses at 260kHz.
LM2676SX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2676SX-3.3/NOPB FAQ
1.How can I place an order for LM2676SX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SX-3.3/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 LM2676SX-3.3/NOPB reliable?
The price and inventory of LM2676SX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SX-3.3/NOPB?
LM2676SX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SX-3.3/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 LM2676SX-3.3/NOPB?
For technical support, including LM2676SX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2676SX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SX-3.3/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 LM2676SX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SX-3.3/NOPB?
All LM2676SX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SX-3.3/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 LM2676SX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2676SX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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