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Texas Instruments LM2676SD-12/NOPB
- Part No.:
- LM2676SD-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SD-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:628
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Product details
Overview
LM2676SD-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, 260kHz fixed-frequency operation, ±2% output voltage tolerance over full line/load/temperature, and 94% peak efficiency at 24VIN/3A. It integrates a 150mΩ DMOS high-side switch and supports industrial power conversion in motor drives and electricity meters.
For engineers reviewing the LM2676SD-12/NOPB datasheet, LM2676SD-12/NOPB pinout, LM2676SD-12/NOPB application, or LM2676SD-12/NOPB equivalent, key selection criteria include its 8–40V input range, ON/OFF control interface, thermal shutdown protection, 50µA standby current, and VSON-14 package compatibility with high-power-density PCB layouts.
Technical Context
The LM2676SD-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) to regulate output via external resistor divider or direct connection for fixed versions.
It operates in continuous conduction mode with programmable current limit (3.6–5.4A), built-in thermal shutdown, and ON/OFF enable logic with 0.8–2.0V threshold. The VSON-14 package features an exposed DAP thermally connected to GND for enhanced thermal performance (RθJA = 29°C/W with 12 vias).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% over –40°C to 125°C junction temperature, 15–40V input, 100mA–3A load. |
| Switching Frequency | 260kHz fixed (±11%), enabling compact magnetics and predictable EMI profile without external timing components. |
| Efficiency | Up to 94% at VIN = 24V, IOUT = 3A - achieved via low RDS(ON) (0.17Ω typ) DMOS switch and optimized gate drive. |
| Input Voltage Range | 8V to 40V DC - supports wide industrial input rails including 12V, 24V, and 36V systems with margin for transients. |
| Standby Current | 50µA max when ON/OFF pin = 0V - enables low-power system sleep modes without external disconnect circuitry. |
| Current Limit | 4.5A typical (3.6–5.4A over temperature) - provides robust short-circuit protection while sustaining 3A continuous output. |
| Thermal Protection | Internal thermal shutdown activates above 165°C junction temperature, with automatic recovery after cooldown. |
Pinout & Package
VSON-14 (NHM) package: 6mm × 5mm body with exposed thermal pad (DAP), RoHS-compliant, leadless surface-mount construction optimized for high-power density and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 14 | Switch_output | High-side DMOS drain node - connects directly to inductor and Schottky diode cathode; switches between VIN and ~–0.5V during OFF time. |
| 2, 3 | Input | Main power input (8–40V); supplies internal bias and high-side switch; requires low-ESR ceramic bypass capacitor placed adjacent to pins. |
| 4 | CB | Bootstrap capacitor connection (to VSW); 100nF ceramic required to sustain gate drive above VIN for full enhancement of high-side FET. |
| 9 | GND | Power ground reference; connects to DAP (exposed thermal pad); must be tied to large copper area with multiple vias for thermal and noise control. |
| 7 | FB | Feedback sense input; internally connected to 12V output divider - no external resistors needed for LM2676SD-12/NOPB. |
| 8 | ON/OFF | Enable control input; <0.8V disables regulator (50µA IQ), >1.4V enables; internal 20µA pull-up allows floating for always-on operation. |
| 1, 5, 6, 10, 11 | NC | No-connect terminals - must remain unconnected per TI design guidance; not internally bonded or functional. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables 3A continuous output without external MOSFETs; reduces BOM count and layout complexity in space-constrained designs. |
| Fixed 12V output with ±2% tolerance | Eliminates need for external feedback resistors; ensures stable regulation across industrial temperature and load ranges without trimming. |
| 260kHz fixed-frequency PWM | Allows use of standard off-the-shelf inductors and simplifies EMI filtering; avoids subharmonic oscillation issues common in variable-frequency controllers. |
| ON/OFF control with 50µA standby | Supports system-level power sequencing and low-power sleep states; compatible with microcontroller GPIO without level-shifting. |
| VSON-14 thermal pad (DAP) | Provides low thermal resistance path (RθJC(top) = 2°C/W) to PCB ground plane - critical for sustained 3A operation in ambient >70°C. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Provides isolated 12V rail for RF transceivers, Ethernet PHYs, and MCU subsystems in cellular base stations and smart grid gateways. IC Role / Device Role / Timing Role: Primary non-isolated buck converter generating clean, regulated 12V from 24V or 36V backplane. Use Value: Delivers 3A at 94% efficiency with minimal thermal rise, reducing heatsink requirements and enabling fanless enclosure designs. |
Use Scenario: Powers metrology ASICs, real-time clocks, and LCD displays in Class 0.2 and 0.5 electricity meters operating from 100–300V AC rectified input. IC Role / Device Role / Timing Role: Secondary-stage DC-DC regulator converting intermediate 15–24V DC to precise 12V for analog front-end and communication ICs. Use Value: ±2% output tolerance ensures accurate ADC reference stability; 50µA shutdown current extends battery backup runtime during mains failure. |
| Calling Button Panel | Motor Drive Auxiliary Supply |
Use Scenario: Supplies 12V to LED indicators, tactile feedback drivers, and low-power microcontrollers in building intercom and elevator call panels. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing linear regulators to eliminate thermal derating at elevated ambient temperatures. Use Value: VSON-14 footprint (6×5mm) fits tight front-panel PCB spaces; thermal pad enables reliable operation at 85°C ambient without airflow. |
Use Scenario: Generates 12V auxiliary rail for gate drivers, current-sense amplifiers, and MCU logic in BLDC and stepper motor drives. IC Role / Device Role / Timing Role: High-current auxiliary supply decoupled from noisy main inverter stage; immune to voltage dips during motor commutation. Use Value: Wide 8–40V input accommodates battery voltage sag (e.g., 36V nominal Li-ion dropping to 28V); current limit protects against driver short circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-12/NOPB | Same pinout, identical 12V fixed output, but rated for 5A output and higher RDS(ON) (120mΩ vs 150mΩ); larger thermal pad area. | Better suited for higher-current loads (>3.5A) or lower-temperature-rise requirements; same PCB layout usable with minor thermal relief adjustment. | Select LM2678SD-12/NOPB if future-proofing for >3A loads or operating ambient exceeds 85°C. |
| TPS54302DDAR | 3A synchronous buck with integrated high/low-side FETs, 2.5–6V input, 3.3–15V adjustable output; no external diode required. | Requires external feedback resistors for 12V; lacks 8–40V input range; smaller 8-pin SOIC package but lower power handling. | Choose TPS54302DDAR only for low-input-voltage (≤6V) systems where synchronous efficiency and board area are prioritized over input range. |
Compared with LM2678SD-12/NOPB, the LM2676SD-12/NOPB offers tighter thermal design margins in constrained VSON footprints but lower current headroom; versus TPS54302DDAR, it delivers broader input flexibility and higher ruggedness at the cost of external diode requirement and larger package size.
Availability
LM2676SD-12/NOPB is available at Aetrix Electronics and suitable for electricity metering, motor drive auxiliary supplies, and communication module power conversion requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for LM2676SD-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 cost-sensitive, high-reliability DC-DC applications where minimal external components and proven thermal performance are critical.
FAQ
What is the maximum input voltage rating for LM2676SD-12/NOPB?
The absolute maximum input voltage for LM2676SD-12/NOPB is 45V, but the recommended operating range is 8V to 40V DC. Operation above 40V risks exceeding safe operating area limits and may trigger internal protection circuits. For reliable long-term use, maintain input within the 8–40V window specified in Section 5.3 of the datasheet.
Does LM2676SD-12/NOPB require external feedback resistors?
No, LM2676SD-12/NOPB does not require external feedback resistors. As a fixed-output variant, it has internal resistor dividers configured for 12V regulation; the FB pin is internally connected to the output, eliminating external components and ensuring ±2% accuracy without calibration.
How is thermal performance managed in the VSON-14 package of LM2676SD-12/NOPB?
LM2676SD-12/NOPB uses an exposed DAP (die attach paddle) in the VSON-14 package, which must be soldered to a dedicated GND copper area on the PCB with ≥12 thermal vias. This achieves RθJA = 29°C/W - critical for sustaining 3A output at 125°C junction temperature without external heatsinking.
Can LM2676SD-12/NOPB be synchronized to an external clock?
No, LM2676SD-12/NOPB cannot be synchronized to an external clock. It uses an internal fixed-frequency 260kHz oscillator with ±11% tolerance. No external sync pin or frequency adjustment capability is provided - this distinguishes it from newer programmable or sync-capable regulators like the TPS54302.
What protection features are integrated into LM2676SD-12/NOPB?
LM2676SD-12/NOPB integrates thermal shutdown (activates >165°C), cycle-by-cycle current limiting (3.6–5.4A), and under-voltage lockout. It also features built-in soft-start via internal capacitor and ON/OFF control with 50µA standby current - no external protection ICs are needed for basic fault coverage.
LM2676SD-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:
- 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:
- 14-VSON (5x6)
LM2676SD-12/NOPB FAQ
1.How can I place an order for LM2676SD-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SD-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 LM2676SD-12/NOPB reliable?
The price and inventory of LM2676SD-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 LM2676SD-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SD-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SD-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SD-12/NOPB?
LM2676SD-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SD-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 LM2676SD-12/NOPB?
For technical support, including LM2676SD-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SD-12/NOPB requirements.
6.How does Aetrix verify that LM2676SD-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SD-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 LM2676SD-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SD-12/NOPB?
All LM2676SD-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SD-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 LM2676SD-12/NOPB part is unused and in its original packaging.
Return procedure for LM2676SD-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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