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Texas Instruments LM2676SDX-12
- Part No.:
- LM2676SDX-12
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-12.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,199
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Product details
Overview
LM2676SDX-12 from Texas Instruments is a monolithic step-down (buck) switching regulator IC delivering up to 3A output current with fixed 12V output, 8V–40V input range, 260kHz fixed-frequency operation, ±2% output voltage tolerance over line/load/temperature, and 94% peak efficiency at 24VIN/3A. It serves as the primary DC-DC power stage in industrial power supplies requiring high-current, thermally robust regulation.
For engineers reviewing the LM2676SDX-12 datasheet, LM2676SDX-12 pinout, LM2676SDX-12 application, or LM2676SDX-12 equivalent, key selection criteria include its TO-263-7 (KTW) thermal performance, integrated 150mΩ DMOS switch, ON/OFF control interface, and compatibility with standard off-the-shelf inductors and Schottky diodes in buck topologies.
Technical Context
The LM2676SDX-12 implements a fixed-frequency PWM-controlled buck converter with internal high-side DMOS FET, bootstrap gate drive (CB pin), and voltage-mode feedback loop referenced to the FB pin. Its 260kHz oscillator enables predictable EMI filtering and compact passive sizing.
It operates across –40°C to +125°C junction temperature, supports shutdown via logic-level ON/OFF pin (1.4V threshold), and integrates thermal shutdown, cycle-by-cycle current limiting (3.6–5.4A), and 50µA standby quiescent current-enabling reliable operation in space-constrained, thermally demanding environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% over full line, load, and –40°C to 125°C junction range-ensures stable rail for downstream logic, motors, or analog circuitry without external resistor network. |
| Max Output Current | 3A continuous-supports high-power loads such as motor drivers or multi-rail subsystems without external current boosting. |
| Input Voltage Range | 8V to 40V-accepts wide-range unregulated inputs including 12V/24V industrial buses and automotive battery-supplied systems. |
| Switching Frequency | 260kHz ±11%-enables use of low-cost, standardized 33µH inductors and simplifies EMI filter design with predictable fundamental harmonic placement. |
| Efficiency | Up to 94% at VIN=24V, IOUT=3A-minimizes thermal dissipation and eliminates need for forced air cooling in sealed enclosures. |
| RDS(ON) | 150mΩ typical-reduces conduction loss in high-current phase, directly contributing to >90% efficiency across operating range. |
| Quiescent Current | 50µA in shutdown (ON/OFF = 0V)-enables ultra-low-power standby modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2676SDX-12 is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1mm × 15.24mm, optimized for high-power dissipation on PCB copper areas.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects directly to inductor and cathode of external Schottky diode-must be routed with minimal loop area to reduce EMI and voltage spikes. |
| 2 (VIN) | Input supply | Primary power input (8–40V); requires local high-frequency bypass capacitor (e.g., 100nF ceramic) placed within 5mm for stable switching operation. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor to generate gate drive voltage >VIN-critical for full enhancement of internal FET and low RDS(ON) performance. |
| 4 (GND) | Power ground | Main return path for input/output capacitors and inductor; must be tied to large copper pour under thermal pad for thermal and electrical integrity. |
| 5 (NC) | No connect | Internally unconnected; electrically isolated-no routing or component attachment required. |
| 6 (FB) | Feedback sense | Direct connection to 12V output capacitor (fixed version); no external divider needed-simplifies layout and improves regulation accuracy vs. adjustable variants. |
| 7 (ON/OFF) | Enable control | Logic-compatible enable input; ≥1.4V enables regulation, ≤0.8V disables with 50µA standby-allows microcontroller-based power sequencing or fault-initiated shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external high-current MOSFET and associated gate driver, reducing BOM count and board area by ~30% versus discrete buck controllers. |
| 260kHz fixed-frequency oscillator | Enables consistent EMI signature and predictable filter design-avoids variable-frequency jitter issues seen in hysteretic converters. |
| ±2% output tolerance over full conditions | Guarantees 11.76V–12.24V output across all operating points-meets tight tolerance requirements for 12V analog sensors and industrial I/O modules. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external sensing circuitry-prevents catastrophic failure during short-circuit or heatsink detachment events. |
| WEBENCH® Power Designer support | Provides validated bill-of-materials, schematic, and performance simulation in <60 seconds-reducing design cycle time from days to hours for production-ready buck stages. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and isolation interfaces in cellular/NB-IoT communication modules deployed in utility infrastructure. IC Role / Device Role / Timing Role: Primary 12V-to-3.3V/5V intermediate regulator supplying isolated DC-DC converters and level-shifted digital logic. Use Value: Delivers 3A peak current during transmission bursts while maintaining <120mV output ripple and surviving 40V surges on 24V field bus inputs. | Use Scenario: Provides regulated 12V rail for metrology ASICs, real-time clocks, and tamper-detection circuitry in Class 0.5S electricity meters. IC Role / Device Role / Timing Role: Main system power converter converting rectified AC or backup battery to stable 12V for precision analog front-end and secure MCU subsystems. Use Value: Maintains ±2% output accuracy across –25°C to +70°C ambient and withstands 10kV ESD per HBM-ensuring metrology-grade calibration stability. |
| Calling Button Panel | Motor Drive Auxiliary Supply |
Use Scenario: Supplies 12V to LED backlighting, tactile feedback solenoids, and microcontroller in building intercom and elevator call panels. IC Role / Device Role / Timing Role: High-reliability DC-DC stage powering electromechanical actuators and status indicators in public-access hardware. Use Value: Withstands repeated 100ms inrush currents from cold LED strings and maintains regulation during 15V line dips-eliminating panel reset events. | Use Scenario: Generates isolated 12V bias for gate drivers and current-sense amplifiers in 24V BLDC motor drives used in HVAC and industrial automation. IC Role / Device Role / Timing Role: Auxiliary power source feeding isolated DC-DC converters that drive half-bridge gate drivers and protect main inverter stage. Use Value: Operates continuously at 2.5A with <1.5W dissipation in TO-263 package-enabling compact, fanless motor controller designs compliant with UL 61800-5-1. |
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 | Lower 1A output current, same 260kHz frequency and 12V fixed output-but uses smaller TO-263-5 package with reduced thermal capability. | Suitable only for light-load 12V rails (e.g., sensor biasing), not for motor or communication module loads requiring >1.5A. | Select LM2675SDX-12 only when thermal budget is extremely constrained and peak load remains ≤1A. |
| TPS54302DDAR | 3A synchronous buck with 2.5–6V input, 3.3–15V adjustable output, 500kHz switching, and integrated high/low-side FETs-no external diode required. | Requires external feedback resistors and cannot accept 8–40V input; better suited for low-voltage battery-powered systems than industrial 24V bus applications. | Choose TPS54302DDAR when input is ≤6V and board space is critical-avoid for legacy 24V/40V industrial systems where LM2676SDX-12's wide VIN and proven reliability are essential. |
Compared with LM2675SDX-12 and TPS54302DDAR, the LM2676SDX-12 uniquely combines 3A capability, 8–40V input, fixed 12V output, and TO-263 thermal performance-making it the only drop-in solution for high-current, wide-input industrial buck conversion without redesigning magnetics or layout.
Availability
LM2676SDX-12 is available at Aetrix Electronics and suitable for communication modules, electricity meters, calling button operating panels, and motor drives requiring stable component supply, long-term lifecycle assurance, and traceable industrial-grade sourcing.
Supply support for LM2676SDX-12 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 over 50 years of innovation in high-reliability power conversion solutions.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio-designed specifically for engineers needing robust, easy-to-implement DC-DC buck regulators with minimal external components and guaranteed performance across harsh industrial environments.
FAQ
What is the maximum input voltage rating for the LM2676SDX-12?
The LM2676SDX-12 has an absolute maximum input voltage rating of 45V, with recommended operating range from 8V to 40V. Exceeding 40V during normal operation risks violating the device's safe operating area, particularly under high-temperature conditions. The 45V absolute max is a stress limit-not a functional specification-and prolonged exposure above 40V may degrade reliability or trigger overvoltage protection in upstream circuitry. Always use input transient suppression if the source can exceed 40V.
Does the LM2676SDX-12 require an external Schottky diode?
Yes, the LM2676SDX-12 requires an external Schottky diode connected between the SW pin (Pin 1) and GND. Unlike synchronous buck controllers, it uses an internal high-side DMOS switch but relies on an external low-VF, fast-recovery Schottky diode (e.g., MBR20100CT) to complete the buck power path during the switch OFF period. Omitting this diode will cause immediate failure due to inductive kickback and lack of current path.
What is the thermal resistance (RθJA) of the LM2676SDX-12 in its TO-263 package?
The LM2676SDX-12 in the KTW (TO-263-7) package has a junction-to-ambient thermal resistance (RθJA) of 56°C/W when mounted on 0.136 in² copper, 35°C/W on 0.4896 in² copper, and 26°C/W on 1.0064 in² copper-per TI's SNVS031N datasheet. Effective thermal performance depends critically on soldering the exposed thermal pad to a minimum 1 in² internal or external copper plane with ≥4 thermal vias. Without proper thermal land, RθJA degrades significantly, risking thermal shutdown above 2A load.
Can the LM2676SDX-12 be synchronized to an external clock?
No, the LM2676SDX-12 does not support external clock synchronization. Its 260kHz oscillator is fully internal and fixed-frequency-no sync pin, no frequency adjustment capability, and no provision for external clock injection. For designs requiring synchronization (e.g., multi-rail systems avoiding beat frequencies), consider alternatives like the TPS54302DDAR or LM5115, which offer SYNC input functionality. The LM2676SDX-12 prioritizes simplicity and EMI predictability over synchronization flexibility.
Is the FB pin of the LM2676SDX-12 internally connected for fixed 12V output?
Yes, the FB pin (Pin 6) of the LM2676SDX-12 is internally connected to a precision voltage divider that sets the output to exactly 12V. No external resistors are required-simply connect Pin 6 directly to the output capacitor's positive terminal. This internal configuration ensures ±2% regulation accuracy without layout sensitivity or resistor tolerance drift, distinguishing it from the adjustable LM2676 versions that require external R1/R2 networks on the FB node.
LM2676SDX-12 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 FAQ
1.How can I place an order for LM2676SDX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-12 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 reliable?
The price and inventory of LM2676SDX-12 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 is usually 5 days.
3.What payment methods are accepted for LM2676SDX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-12?
LM2676SDX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-12 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?
For technical support, including LM2676SDX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-12 requirements.
6.How does Aetrix verify that LM2676SDX-12 is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-12 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 meets industry standards.
7.What is the process for return or replacement of LM2676SDX-12?
All LM2676SDX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-12, 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 part is unused and in its original packaging.
Return procedure for LM2676SDX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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