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Texas Instruments LM2676SX-12/NOPB
- Part No.:
- LM2676SX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676SX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:663
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Product details
Overview
LM2676SX-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. 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-12/NOPB datasheet, LM2676SX-12/NOPB pinout, LM2676SX-12/NOPB application, or LM2676SX-12/NOPB equivalent, key selection criteria include verified 12V fixed-output regulation accuracy, thermal performance in TO-263 (KTW) package, 50µA shutdown quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes per TI's SIMPLE SWITCHER® design methodology.
Technical Context
The LM2676SX-12/NOPB implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal 150mΩ DMOS high-side switch. Its feedback loop uses a precision 1.21V reference and low-bias-current amplifier (85nA) referenced to the FB pin, enabling stable regulation without external compensation in most configurations.
It operates in continuous conduction mode (CCM) across full load range (100mA–3A), features built-in thermal shutdown and cycle-by-cycle current limiting (typ. 4.5A), and transitions cleanly between active mode (ON/OFF ≥1.4V) and shutdown mode (ON/OFF ≤0.8V) with 45–100µA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% over full line/load/temperature (–40°C to 125°C), eliminating need for external resistor divider. |
| Input Voltage Range | 8V to 40V DC - supports wide industrial input rails including 12V, 24V, and 36V nominal systems. |
| Max Output Current | 3A continuous - sufficient for powering FPGA I/O banks, motor drivers, or multi-rail subsystems. |
| Switching Frequency | 260kHz fixed - enables use of compact, low-cost 33µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | Up to 94% at VIN=24V, IOUT=3A - minimizes thermal stress and simplifies heatsinking in enclosed enclosures. |
| Quiescent Current | 50µA in shutdown (ON/OFF = 0V) - critical for battery-backed or energy-harvesting applications requiring ultra-low standby drain. |
| RDS(ON) | 0.15Ω typical - reduces conduction loss and improves efficiency at high load currents. |
| Thermal Resistance | RθJA = 56°C/W (KTW package on 0.136 in² copper) - enables 3A operation without external heatsink under moderate ambient conditions. |
Pinout & Package
LM2676SX-12/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), with exposed DAP connected to GND for optimal thermal and electrical performance. The 7-pin configuration supports direct integration into high-current PCB layouts with minimal trace inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET; connects to inductor and Schottky diode cathode - carries high dv/dt switching waveform. |
| 2 (IN) | Input supply | High-current input path for 8–40V; must be bypassed with low-ESR capacitor placed <2mm from pin to minimize ringing. |
| 3 (CB) | Bootstrap capacitor | Connects 100nF ceramic capacitor to SW pin to generate gate drive voltage >VIN for full FET enhancement. |
| 4 (GND) | Power ground | Main return path for IN, SW, and FB; requires low-inductance connection to system ground plane and CIN/COUT grounds. |
| 5 (NC) | No connect | Internally unconnected; must remain floating - no routing or soldering permitted. |
| 6 (FB) | Feedback sense | Direct connection to output capacitor for fixed 12V version; internal resistor divider sets regulation point - no external components required. |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V enables regulation; ≤0.8V disables output and reduces IQ to 50µA - compatible with microcontroller GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables 3A output without external MOSFET, reducing BOM count and layout complexity while maintaining >90% efficiency at full load. |
| Fixed 12V output with ±2% tolerance | Guarantees accurate rail generation for analog front-ends, sensors, or logic interfaces without calibration or trimming. |
| 260kHz fixed-frequency PWM | Allows predictable EMI filtering and consistent inductor sizing across designs - avoids frequency jitter issues seen in variable-frequency regulators. |
| Thermal shutdown + current limit | Protects against overload, short-circuit, and overheating events without external circuitry - ensures robust field reliability. |
| 50µA shutdown current | Supports always-on subsystems with battery backup or low-power wake-up architectures where standby consumption is critical. |
| SIMPLE SWITCHER® design support | Validated reference designs, WEBENCH® Power Designer integration, and pre-qualified inductor libraries accelerate time-to-prototype by >50%. |
Applications
| Industrial Motor Drives | Smart Electricity Meters |
|---|---|
|
Use Scenario: Powering gate drivers and isolated ADCs in 3-phase BLDC inverters operating from 24V bus. IC Role / Device Role / Timing Role: Primary 12V buck regulator supplying isolated power rails for IGBT/SiC driver ICs and metrology SoCs. Use Value: Delivers stable 12V at 3A with <1% ripple under dynamic load steps, ensuring clean timing margins for high-resolution current sensing. |
Use Scenario: Providing regulated 12V bias for real-time clock (RTC), LCD backlight, and PLC communication modules in utility-grade meters. IC Role / Device Role / Timing Role: Main system power converter converting 36V DC input (from transformer rectifier) to isolated 12V output. Use Value: Maintains ±2% regulation across –25°C to 70°C ambient and 8–40V input variation, guaranteeing RTC accuracy and display contrast stability. |
| Communication Module Power | Calling Button Operating Panel |
|
Use Scenario: Supplying 12V to PoE-powered Ethernet switches, RF transceivers, and SFP+ cage management circuits. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 48V PoE-derived rail to 12V for PHY and auxiliary logic. Use Value: Achieves 94% efficiency at 24VIN/3A, minimizing heat buildup in dense 1U chassis and extending thermal margin for fanless operation. |
Use Scenario: Powering LED indicators, tactile feedback solenoids, and microcontroller peripherals in building access panels. IC Role / Device Role / Timing Role: Compact, thermally efficient 12V source replacing linear regulators to reduce board area and improve battery life. Use Value: Enables 50µA shutdown mode during idle periods, extending coin-cell or supercapacitor backup runtime by >3× versus linear solutions. |
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-12/NOPB | 2.5A max output current, same 260kHz frequency and 12V fixed output, but lower current capability and reduced thermal performance in SOIC package. | Suitable only for <2.5A loads; lacks KTW package thermal advantage - limited in high-ambient or high-reliability deployments. | Select when board space constraints favor SOIC-8 and peak load remains below 2.5A with adequate derating. |
| LM2596SX-12/NOPB | 3A rating and 12V fixed output, but 150kHz switching frequency, higher RDS(ON) (0.22Ω), and ±4% output tolerance. | Requires larger inductors/capacitors; less precise regulation impacts sensitive analog circuitry - not recommended for metrology or precision timing. | Choose only for cost-sensitive, non-critical 12V rails where size and accuracy are secondary to BOM cost. |
Compared with LM2675MX-12/NOPB and LM2596SX-12/NOPB, LM2676SX-12/NOPB delivers higher current (3A vs. 2.5A), tighter regulation (±2% vs. ±4%), superior thermal performance via KTW package, and higher efficiency - making it the preferred choice for industrial 12V power where reliability and density matter.
Availability
LM2676SX-12/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, smart electricity meters, and communication module power supplies requiring stable component supply, long-term lifecycle assurance, and validated thermal performance in TO-263 packaging.
Supply support for LM2676SX-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, with decades of expertise in high-reliability power conversion ICs.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically to simplify robust, high-efficiency DC-DC buck converter implementation for industrial, metering, and communications equipment without requiring expert power design knowledge.
FAQ
What is the maximum input voltage rating for LM2676SX-12/NOPB?
The absolute maximum input voltage for LM2676SX-12/NOPB is 45V, but the recommended operating range is 8V to 40V DC. Exceeding 40V continuously risks exceeding thermal limits and degrading long-term reliability - TI specifies 40V as the upper bound for guaranteed performance across temperature and load conditions in the LM2676SX-12/NOPB datasheet.
Does LM2676SX-12/NOPB require external feedback resistors?
No, LM2676SX-12/NOPB does not require external feedback resistors. As a fixed 12V output variant, it contains an internal resistor divider connected to the FB pin; users connect FB directly to the output capacitor. This eliminates tuning errors and improves regulation accuracy versus adjustable versions that rely on external resistor matching.
What package type is used for LM2676SX-12/NOPB?
LM2676SX-12/NOPB is packaged in the KTW (TO-263-7) thermally enhanced surface-mount package, measuring 10.1mm × 15.24mm with an exposed DAP tied to GND. This package provides significantly lower thermal resistance than SOIC or TO-220 variants, enabling 3A operation with minimal heatsinking in industrial PCB layouts.
How does the ON/OFF pin function on LM2676SX-12/NOPB?
The ON/OFF pin (Pin 7) on LM2676SX-12/NOPB enables logic-level control: applying ≥1.4V activates regulation, while ≤0.8V forces shutdown with 50µA quiescent current. The pin includes an internal 20µA pull-up and 7V Zener clamp - allowing direct interfacing with 3.3V or 5V microcontrollers without level-shifting circuitry.
Can LM2676SX-12/NOPB operate in discontinuous conduction mode (DCM)?
Yes, LM2676SX-12/NOPB automatically transitions into discontinuous conduction mode below ~300mA load due to its voltage-mode PWM architecture and fixed 260kHz frequency. DCM operation reduces light-load losses and maintains regulation stability - confirmed in Figure 5-13 of the LM2676SX-12/NOPB datasheet showing waveforms at 500mA.
LM2676SX-12/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):
- 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:
- TO-263 (DDPAK-7)
LM2676SX-12/NOPB FAQ
1.How can I place an order for LM2676SX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SX-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 LM2676SX-12/NOPB reliable?
The price and inventory of LM2676SX-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 LM2676SX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SX-12/NOPB?
LM2676SX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SX-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 LM2676SX-12/NOPB?
For technical support, including LM2676SX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SX-12/NOPB requirements.
6.How does Aetrix verify that LM2676SX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SX-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 LM2676SX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SX-12/NOPB?
All LM2676SX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SX-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 LM2676SX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2676SX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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