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Texas Instruments LM2676T-12
- Part No.:
- LM2676T-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2676T-12.pdf
- Description:
- IC REG BUCK 12V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,891
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Product details
Overview
LM2676T-12 from Texas Instruments is a monolithic step-down (buck) 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 ON/OFF control for low-power standby mode in industrial power supplies.
For engineers reviewing the LM2676T-12 datasheet, LM2676T-12 pinout, LM2676T-12 application, or LM2676T-12 equivalent, key selection criteria include input voltage range (8–40V), thermal performance in TO-220/TO-263 packages, feedback configuration for fixed-output use, and compatibility with standard off-the-shelf inductors and Schottky diodes in buck converter designs.
Technical Context
The LM2676T-12 implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal current-limit protection (3.6–5.4A). Its DMOS power switch operates with RDS(ON) = 0.15–0.29Ω across –40°C to 125°C, enabling high-efficiency conversion without external gate drivers.
Functional modes include active regulation (ON/OFF ≥ 1.4V) and shutdown (ON/OFF ≤ 0.8V), drawing only 50–150µA standby current. The FB pin is internally tied to the 12V output divider, eliminating external resistors - unlike the adjustable version requiring external feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% (11.64–12.36V) over –40°C to 125°C, no external feedback required |
| Max Output Current | 3A continuous; current limit threshold 3.6–5.4A ensures safe overload handling |
| Input Voltage Range | 8V to 40V DC - supports wide-range industrial inputs including 12V/24V/36V rails |
| Switching Frequency | 260kHz ±11% - enables compact magnetics and predictable EMI filtering |
| Efficiency | 94% typical at 24VIN/3A - minimizes thermal load in enclosed power modules |
| RDS(ON) | 0.15Ω typical (0.29Ω max at 125°C) - reduces conduction loss and junction temperature rise |
| Standby Current | 50µA typical (150µA max) when ON/OFF = 0V - enables ultra-low-power system sleep states |
Pinout & Package
LM2676T-12 is available in NDZ (TO-220, 7-pin) and KTW (TO-263, 7-pin) packages. Both share identical pin numbering and function mapping; the exposed tab (DAP) must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | High-side DMOS drain node - connects to inductor and Schottky cathode; switches between VIN and ~–0.5V during OFF time |
| 2 (VIN) | Input | Main power input (8–40V); requires low-ESR bypass capacitor placed within 5mm of pin |
| 3 (CB) | Bootstrap capacitor | Connects 100nF ceramic cap to SW pin - provides gate drive voltage > VIN for full MOSFET enhancement |
| 4 (GND) | Power ground | Primary return path for VIN, SW, and FB; must tie to large copper pour for thermal dissipation |
| 5 (NC) | No connect | Internally unconnected - leave floating; no routing or thermal pad connection required |
| 6 (FB) | Feedback | Internally connected to 12V output divider - short directly to VOUT; no external resistors needed |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V = ON, ≤0.8V = OFF; internal 20µA pull-up allows simple open-drain control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS switch | Eliminates need for external MOSFET driver; 150mΩ RDS(ON) sustains 3A output with <1W conduction loss at 25°C |
| Fixed 12V output configuration | Removes external feedback resistor network - reduces BOM count and layout sensitivity to noise coupling |
| Thermal shutdown + current limiting | Protects against sustained overloads and PCB overheating without external circuitry - auto-recovery on cooldown |
| 260kHz fixed-frequency PWM | Enables consistent EMI filter design and predictable inductor sizing using TI's published nomographs |
| ON/OFF logic control | Supports system-level power sequencing and low-quiescent sleep modes with <150µA total shutdown current |
Applications
| Industrial Motor Drives | Electricity Meters |
|---|---|
Use Scenario: Powering microcontroller, ADC, and isolation interfaces in 3-phase motor control inverters with 24V bus input. IC Role / Device Role / Timing Role: Primary 12V buck regulator supplying logic and sensing circuitry; operates continuously under variable load transients. Use Value: 94% efficiency at 3A reduces heat sink requirements; ±2% output tolerance ensures stable ADC reference and gate driver biasing. | Use Scenario: Providing regulated 12V rail for metrology SoC, RTC, and optical communication modules in smart electricity meters. IC Role / Device Role / Timing Role: Main isolated auxiliary supply - accepts wide-input 8–40V from meter's front-end rectifier and maintains tight regulation during brownouts. Use Value: 50µA standby current extends battery backup life; thermal shutdown prevents fault propagation during surge events. |
| Communication Modules | Calling Button Panels |
Use Scenario: Generating 12V for PoE-powered wireless gateways, LTE modems, and Ethernet PHYs in outdoor telecom enclosures. IC Role / Device Role / Timing Role: Secondary DC-DC stage converting 48V PoE-derived intermediate rail to 12V for RF front-end and baseband ICs. Use Value: 260kHz switching frequency simplifies EMI compliance testing; TO-263 package supports forced-air cooling in sealed housings. | Use Scenario: Supplying 12V to LED indicators, tactile switches, and low-power MCU in building intercom and elevator call panels. IC Role / Device Role / Timing Role: Standalone non-isolated regulator fed from 24V building power; cycles between active and deep-sleep states. Use Value: ON/OFF pin enables MCU-controlled power gating - cuts system idle power by >99% versus linear regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-12 | Lower 150kHz switching frequency; 3.5A current limit; higher RDS(ON) (0.22Ω typ) | Less efficient at high load; larger inductors required; lower EMI but slower transient response | Choose for cost-sensitive, lower-frequency designs where size is less constrained |
| TPS54302DDAR | 3.5V–28V input; 3A sync-buck; 2.5MHz switching; integrated FETs; 20µA IQ | Higher frequency enables smaller passives; requires external compensation; no fixed-12V variant | Choose for space-constrained designs needing faster load transients and lower quiescent current |
Compared with LM2676T-12, LM2596T-12 trades efficiency and thermal performance for lower BOM cost, while TPS54302DDAR offers higher integration and frequency at the expense of fixed-output simplicity and legacy design compatibility.
Availability
LM2676T-12 is available at Aetrix Electronics and suitable for industrial motor drives, electricity meters, communication modules, and calling button operating panels requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM2676T-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.
The LM2676 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for robust, easy-to-implement DC-DC buck regulation in industrial, metering, and communications equipment where reliability and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LM2676T-12?
The LM2676T-12 has an absolute maximum input voltage rating of 45V, but its recommended operating range is 8V to 40V DC. Operation above 40V risks exceeding thermal limits and degrading long-term reliability, even if within absolute max ratings. For sustained 40V operation, proper heatsinking in TO-220 or TO-263 packages is essential to maintain junction temperature below 125°C.
Does the LM2676T-12 require external feedback resistors to set the output voltage?
No - the LM2676T-12 is a fixed-output variant with internal feedback divider configured for 12V. Pin 6 (FB) must be connected directly to the output capacitor; no external resistors are needed or permitted. This eliminates tuning errors and improves stability compared to adjustable versions like LM2676-ADJ.
How does the ON/OFF pin function on the LM2676T-12?
The ON/OFF pin (Pin 7) enables logic-level control: applying ≥1.4V turns the regulator on, while ≤0.8V forces shutdown with 50–150µA standby current. An internal 20µA pull-up allows direct connection to MCU GPIOs without external biasing. Floating the pin defaults to ON state, making it compatible with simple enable schemes in industrial systems.
What package options are available for the LM2676T-12, and how do they differ thermally?
The LM2676T-12 is offered in NDZ (TO-220, 7-pin) and KTW (TO-263, 7-pin) packages. In still air with minimal copper, NDZ has RθJA ≈ 65°C/W; KTW achieves ≈ 56°C/W. With 1 oz copper area (4 in² for NDZ, 0.49 in² for KTW), thermal resistance drops to 45°C/W and 35°C/W respectively - making KTW preferable for high-power-density layouts.
Can the LM2676T-12 be used in discontinuous conduction mode (DCM)?
Yes - the LM2676T-12 automatically transitions into DCM at light loads (<300mA typical), reducing switching losses and improving light-load efficiency. Its voltage-mode control architecture maintains stable regulation across both continuous and discontinuous modes without external mode-select circuitry or compensation changes.
LM2676T-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2676T-12 FAQ
1.How can I place an order for LM2676T-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676T-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 LM2676T-12 reliable?
The price and inventory of LM2676T-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676T-12 is usually 5 days.
3.What payment methods are accepted for LM2676T-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676T-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676T-12?
LM2676T-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676T-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 LM2676T-12?
For technical support, including LM2676T-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676T-12 requirements.
6.How does Aetrix verify that LM2676T-12 is sourced from the original manufacturer or authorized distributors?
All LM2676T-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 LM2676T-12 meets industry standards.
7.What is the process for return or replacement of LM2676T-12?
All LM2676T-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676T-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 LM2676T-12 part is unused and in its original packaging.
Return procedure for LM2676T-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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