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Texas Instruments LM2676SDX-12/NOPB
- Part No.:
- LM2676SDX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,475
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Product details
Overview
LM2676SDX-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output current with fixed 12V output, 8–40V input range, 260kHz fixed-frequency operation, and ±2% output voltage tolerance over –40°C to 125°C junction temperature - used in industrial power supplies requiring high-efficiency, thermally robust regulation.
For engineers reviewing the LM2676SDX-12/NOPB datasheet, LM2676SDX-12/NOPB pinout, LM2676SDX-12/NOPB application, or LM2676SDX-12/NOPB equivalent, key selection criteria include its 150mΩ internal DMOS switch, 50µA shutdown quiescent current, thermal shutdown protection, ON/OFF control interface, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2676SDX-12/NOPB integrates a high-side DMOS power switch, PWM controller with fixed 260kHz oscillator, internal feedback amplifier, and thermal/current protection circuitry - operating in continuous conduction mode with duty cycle determined by VIN/VOUT ratio. Its bootstrap gate drive (CB pin) enables full enhancement of the internal FET for low RDS(ON) conduction.
It supports active-mode regulation and shutdown mode via the ON/OFF pin (1.4V threshold), delivers 94% peak efficiency at 24VIN/12VOUT/3A, and maintains ±2% output accuracy across line, load, and temperature - with built-in current limiting (3.6–5.4A) and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% over full line/load/temperature - ensures stable rail for downstream logic or analog circuitry without external resistor network. |
| Input Voltage Range | 8V to 40V - supports wide industrial input sources including 12V/24V/36V battery or unregulated DC bus systems. |
| Max Output Current | 3A continuous - sufficient for powering FPGA I/O banks, motor drivers, or multi-rail subsystems with margin. |
| Switching Frequency | 260kHz ±11% - enables use of compact, low-cost off-the-shelf inductors (e.g., 33µH) and reduces EMI compared to higher-frequency alternatives. |
| RDS(ON) | 0.15Ω typical - minimizes conduction loss and heat generation at 3A, supporting >90% efficiency without forced airflow. |
| Quiescent Current | 50µA in shutdown - enables ultra-low-power standby states in battery-backed or energy-conscious systems. |
| Operating Junction Temp | –40°C to 125°C - qualified for harsh environments including industrial controls, metering, and motor drives. |
Pinout & Package
LM2676SDX-12/NOPB uses the KTW (TO-263-7) package: 10.1mm × 15.24mm thermally enhanced surface-mount outline with exposed tab for PCB copper thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | High-side DMOS drain node - connects directly to inductor and Schottky cathode; switches between VIN and ~–0.4V during OFF state. |
| 2 (VIN) | Input supply | Main power input (8–40V); requires low-ESR bypass capacitor placed within 5mm for stability and EMI suppression. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor - provides gate drive voltage above VIN to fully enhance internal FET. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and IC substrate; must tie to large copper pour for thermal and noise control. |
| 5 (NC) | No connect | Internally unconnected - leave floating; no routing or soldering required. |
| 6 (FB) | Feedback sense | Internally tied to 12V divider - shorted directly to output capacitor for fixed 12V operation; no external resistors needed. |
| 7 (ON/OFF) | Enable control | Logic-level input (1.4V threshold); pull low or ground to enter 50µA shutdown - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external high-current MOSFET and driver, reducing BOM count and layout complexity. |
| Fixed 12V output configuration | Removes feedback resistor selection error and drift - guarantees ±2% output accuracy without calibration. |
| 260kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across designs using TI-recommended parts. |
| Thermal shutdown + current limit | Protects against overload, short-circuit, or inadequate heatsinking - latches off until reset via ON/OFF pin toggle. |
| WEBENCH® Power Designer support | Generates complete schematics, bill-of-materials, efficiency plots, and thermal simulations directly from TI's online tool. |
Applications
| Industrial Electricity Metering | Motor Drive Power Stage |
|---|---|
|
Use Scenario: Provides isolated 12V bias rail for metrology ADCs, real-time clocks, and communication interfaces in smart electricity meters operating from 12–36V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter supplying regulated 12V to precision analog front-end and RS-485 transceivers. Use Value: Maintains ±2% output accuracy across –25°C to 70°C ambient and 8–40V input variation - ensuring metrology-grade reference stability. |
Use Scenario: Powers gate drivers and logic for 3-phase BLDC motor controllers in HVAC or pump systems with 24V DC input. IC Role / Device Role / Timing Role: High-current 12V supply for half-bridge driver ICs and microcontroller peripherals in motor control subsystems. Use Value: Delivers 3A continuously at 94% efficiency with thermal shutdown - prevents latch-up during stall or overload conditions. |
| Communication Module Power | Calling Panel Power Supply |
|
Use Scenario: Supplies 12V to LTE/Wi-Fi modules, RF front-ends, and baseband processors in remote telemetry units powered from solar-charged batteries. IC Role / Device Role / Timing Role: Main DC-DC stage converting variable 12–36V battery voltage to stable 12V for RF power amplifiers and digital ICs. Use Value: 50µA shutdown current extends battery life during idle periods; 260kHz frequency avoids interference with cellular bands. |
Use Scenario: Powers LED indicators, tactile buttons, and low-power MCU in building intercom panels connected to 24V PoE or centralized DC distribution. IC Role / Device Role / Timing Role: Compact, thermally efficient 12V regulator enabling slim-profile enclosure design with minimal heatsinking. Use Value: TO-263 package with exposed tab dissipates >2W at 125°C ambient - eliminates need for external heatsink in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675SDX-12/NOPB | 2.5A max output current, same 260kHz frequency and 12V fixed output - lower current rating and reduced thermal capability. | Suitable only for <2A loads; cannot replace LM2676SDX-12/NOPB in 3A applications without derating or redesign. | Select when load current is consistently ≤2A and board space/thermal budget is constrained. |
| LMR51430RGER | 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 at light loads due to synchronous rectification; requires different compensation and layout vs. LM2676SDX-12/NOPB. | Choose for new designs targeting >95% efficiency, smaller solution size, or wider input range below 8V. |
Compared with LM2676SDX-12/NOPB, LM2675SDX-12/NOPB offers identical pinout and features but reduced current capacity, while LMR51430RGER improves efficiency and integration at the cost of design compatibility and external component count reduction.
Availability
LM2676SDX-12/NOPB is available at Aetrix Electronics and suitable for industrial electricity metering, motor drive power stages, and communication module power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2676SDX-12/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 - serving industrial, automotive, and communications markets since 1930.
The LM2676 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in non-isolated DC-DC buck applications where high efficiency, thermal robustness, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LM2676SDX-12/NOPB?
The absolute maximum input voltage for LM2676SDX-12/NOPB is 45V, but the recommended operating range is 8V to 40V. Exceeding 40V may trigger internal protection or reduce reliability; sustained operation above this limit is not advised per TI's datasheet SNVS031N Section 5.1.
Does LM2676SDX-12/NOPB require an external feedback resistor network?
No - LM2676SDX-12/NOPB is the fixed 12V output variant, so internal feedback resistors set the output voltage. Pin 6 (FB) must be connected directly to the output capacitor; no external resistors are needed or permitted for this version of the LM2676.
What thermal performance can be expected from LM2676SDX-12/NOPB in a standard PCB layout?
In a standard 4-layer PCB with 0.4896 in² of 1 oz copper connected to the KTW package tab, LM2676SDX-12/NOPB achieves RθJA ≈ 35°C/W. At 3A/12V output (36W input), this yields ~30°C rise above ambient - well within the –40°C to 125°C junction limit under typical industrial conditions.
Can LM2676SDX-12/NOPB be synchronized to an external clock?
No - LM2676SDX-12/NOPB uses an internal fixed-frequency 260kHz oscillator with ±11% tolerance and no external synchronization capability. For synchronizable alternatives, consider TI's TPS543x or LMR365 series, which support external clock injection.
Is LM2676SDX-12/NOPB pin-compatible with other LM2676 variants like the adjustable or 5V versions?
Yes - all LM2676 variants (including LM2676SDX-12/NOPB, LM2676SDX-5.0/NOPB, and LM2676SDX-ADJ/NOPB) share identical KTW (TO-263-7) pinout and package footprint. Only the FB pin connection differs: fixed versions short FB to VOUT, while the ADJ version requires external resistor divider.
LM2676SDX-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 12V
- 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:
- 14-VSON (5x6)
LM2676SDX-12/NOPB FAQ
1.How can I place an order for LM2676SDX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-12/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 LM2676SDX-12/NOPB reliable?
The price and inventory of LM2676SDX-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SDX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SDX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-12/NOPB?
LM2676SDX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-12/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 LM2676SDX-12/NOPB?
For technical support, including LM2676SDX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-12/NOPB requirements.
6.How does Aetrix verify that LM2676SDX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-12/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 LM2676SDX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SDX-12/NOPB?
All LM2676SDX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-12/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 LM2676SDX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2676SDX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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