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Texas Instruments LM2676T-12/NOPB
- Part No.:
- LM2676T-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2676T-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:360
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Product details
Overview
LM2676T-12/NOPB 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 serves as the primary DC-DC power stage in industrial power supplies requiring high-current, wide-input (8–40V), thermally robust regulation.
For engineers reviewing the LM2676T-12/NOPB datasheet, LM2676T-12/NOPB pinout, LM2676T-12/NOPB application, or LM2676T-12/NOPB equivalent, key selection criteria include its 150mΩ internal DMOS switch RDS(ON), 50µA shutdown quiescent current, integrated thermal shutdown/current limiting, and TO-263-7 (KTW) package with exposed thermal pad for high-power dissipation.
Technical Context
The LM2676T-12/NOPB implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal high-side DMOS power switch. Its feedback loop uses a precision 1.21V reference and high-gain amplifier referenced to the FB pin, configured for fixed 12V output via internal resistor divider - eliminating external resistors.
It operates in continuous conduction mode (CCM) across its rated load range (100mA–3A) and supports active shutdown via the ON/OFF pin, reducing supply current to ≤150µA. Thermal protection triggers at TJ ≥ 160°C, and current limit is factory-trimmed to 3.6–5.4A over –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% (11.76–12.24V) over full line, load, and –40°C to +125°C junction temperature - ensures stable rail for downstream logic and analog circuitry without trimming. |
| Max Output Current | 3A continuous - supports high-power loads such as motor drivers, communication modules, or multi-rail power systems without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates unregulated industrial rails (e.g., 24V nominal with surge), battery-backed systems, and wide-range AC/DC adapters. |
| Switching Frequency | 260kHz ±11% - enables use of compact, off-the-shelf 33µH inductors and standard electrolytic/tantalum output capacitors while maintaining EMI below critical bands. |
| RDS(ON) | 0.15Ω typical (0.29Ω max at 125°C) - minimizes conduction loss and thermal rise in the internal high-side DMOS switch, directly enabling >94% efficiency at full load. |
| Quiescent Current | 6mA typical operating IQ; 50µA standby (≤150µA max over temp) when ON/OFF pin <0.8V - preserves battery life in always-on or low-power wake-up systems. |
| Thermal Shutdown | Activates at ~160°C junction temperature - protects device and PCB during overload, short-circuit, or inadequate heatsinking without external circuitry. |
Pinout & Package
LM2676T-12/NOPB is packaged in TO-263-7 (KTW) - a surface-mount, thermally enhanced variant of the DDPAK with 10.1mm × 15.24mm footprint and exposed copper thermal pad (DAP) soldered to PCB ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects directly to inductor and Schottky diode cathode - carries high dv/dt switching waveform and must be routed with minimal loop area. |
| 2 (VIN) | Input supply | Main power input (8–40V); requires low-ESR ceramic bypass capacitor placed within 5mm - path to GND must be shortest possible to suppress ringing. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor; provides gate drive voltage above VIN to fully enhance internal FET - critical for low RDS(ON) and efficiency. |
| 4 (GND) | Power ground | Primary return for VIN, SW, FB, and ON/OFF; must tie directly to thermal pad and system ground plane - forms low-impedance path for high di/dt currents. |
| 5 (NC) | No connect | Internally unconnected; must remain floating - no routing or component attachment permitted. |
| 6 (FB) | Feedback sense | Connected directly to output capacitor for fixed 12V version - internal 1.21V reference and resistor divider set VOUT; sensitive to noise, so keep trace short and away from SW node. |
| 7 (ON/OFF) | Enable control | Logic-level enable: ≥1.4V = active regulation; ≤0.8V = shutdown (50µA IQ); internal 20µA pullup allows open-circuit operation - supports remote power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS power switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while enabling >94% efficiency at 3A. |
| Fixed 12V output with ±2% tolerance | Guarantees precise rail generation without external feedback resistors - simplifies design validation and improves long-term stability vs. adjustable variants. |
| 260kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing; avoids frequency jitter issues found in variable-frequency controllers. |
| Thermal shutdown + current limiting | Provides autonomous fault protection under overload, short-circuit, or ambient overheating - no external sensing or latch circuitry required. |
| 50µA shutdown current | Supports ultra-low-power standby modes in battery-powered or energy-harvesting applications where microamp-level leakage is critical. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and isolated RS-485 interface in cellular IoT gateways operating from 24V DC field bus. IC Role / Device Role / Timing Role: Primary 12V buck regulator supplying clean, regulated power to digital and analog subsystems; not a timing device. Use Value: Delivers 3A continuous current with <120mVpp ripple at full load, meeting EN 55022 Class B conducted EMI limits without added filtering. |
Use Scenario: Provides isolated 12V rail for metrology ASIC, real-time clock, and LCD backlight in DIN-rail mounted smart electricity meters. IC Role / Device Role / Timing Role: Main DC-DC converter converting rectified 30–40V AC-derived input to stable 12V; supports cold-start from low-line conditions. Use Value: Maintains regulation down to 8V input and withstands 40V transients per IEC 61000-4-5, ensuring uninterrupted operation during grid disturbances. |
| Motor Drive Auxiliary Supply | Calling Button Panel Power |
Use Scenario: Generates 12V for gate drivers, position sensors, and MCU in 24V-powered BLDC motor drives used in HVAC actuators. IC Role / Device Role / Timing Role: High-current auxiliary power supply decoupled from main inverter bus; handles repetitive 3A load pulses during motor commutation. Use Value: Sustains 3A output with <5°C junction rise above ambient (with 1-in² 1oz Cu) - avoids thermal derating in enclosed enclosures. |
Use Scenario: Powers LED indicators, tactile feedback circuitry, and low-power MCU in building intercom calling panels powered from 24V PoE injectors. IC Role / Device Role / Timing Role: Compact, thermally efficient 12V regulator enabling slim-profile mechanical design with no heatsink required. Use Value: Achieves 92% efficiency at 500mA load and shuts down to 50µA when panel is idle - extends battery backup runtime by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675T-12/NOPB | 2.5A rated output current; identical 12V fixed output, 260kHz, TO-263-5 package (no NC pin, no CB pin - integrated bootstrap) | Suitable only for ≤2.5A loads; lacks separate CB pin - limits flexibility in high-efficiency designs requiring external bootstrap optimization. | Select when load current is confirmed ≤2.5A and board space is constrained - smaller package but lower current headroom. |
| LM2596T-12/NOPB | 3A rated but 150kHz switching frequency; higher RDS(ON) (0.22Ω typ); ±4% output tolerance; TO-220-5 package | Requires larger inductors/capacitors; less efficient at high load; wider output tolerance impacts sensitive analog circuits. | Choose for cost-sensitive, non-EMI-critical applications where 150kHz operation and relaxed accuracy are acceptable. |
Compared with LM2676T-12/NOPB, LM2675T-12/NOPB trades 0.5A current capacity for reduced pin count and integrated bootstrap, while LM2596T-12/NOPB sacrifices switching speed, efficiency, and output precision for legacy compatibility and lower unit cost.
Availability
LM2676T-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, smart metering systems, and motor control electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2676T-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 ICs, with decades of expertise 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 proven thermal performance in industrial environments.
FAQ
What is the maximum input voltage rating for LM2676T-12/NOPB?
The absolute maximum input voltage for LM2676T-12/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe SOA limits during transients, even with proper input capacitance. The device maintains regulation and protection functionality across the full 8–40V range, making it ideal for 24V industrial buses with surge margins.
Does LM2676T-12/NOPB require an external feedback resistor network?
No - LM2676T-12/NOPB is a fixed-output variant with internal resistor divider setting VOUT to 12V. Pin 6 (FB) must be connected directly to the output capacitor's positive terminal. Adding external resistors will disrupt regulation and may cause overvoltage or instability. Only adjustable versions (e.g., LM2676-ADJ) require external feedback networks.
How is thermal performance affected by PCB layout for LM2676T-12/NOPB?
Thermal resistance (RθJA) of LM2676T-12/NOPB drops from 56°C/W (minimal copper) to 26°C/W with 1.0064 in² of 1oz copper connected to the DAP. Proper soldering of the exposed thermal pad to a solid ground plane with ≥4 thermal vias is mandatory to achieve rated 3A output. Inadequate copper area causes premature thermal shutdown above 2A at 70°C ambient.
Can LM2676T-12/NOPB be synchronized to an external clock?
No - LM2676T-12/NOPB uses an internal fixed 260kHz oscillator with no synchronization input. Frequency variation is ±11% over temperature and line. For synchronizable alternatives, consider TI's LM5115 or newer SIMPLE SWITCHER® devices like LM5164, which support external clock injection for EMI reduction in multi-regulator systems.
What type of catch diode is recommended for LM2676T-12/NOPB?
A Schottky diode with ≥3A average current rating, ≤0.5V forward voltage, and fast recovery (<50ns) is required - e.g., SB560 (5A, 0.6V) or MBR360 (3A, 0.54V). The diode must be mounted adjacent to the SW and GND pins with minimal trace length to reduce reverse-recovery losses and EMI. Using a slow PN diode causes excessive heating and efficiency collapse.
LM2676T-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2676T-12/NOPB FAQ
1.How can I place an order for LM2676T-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676T-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 LM2676T-12/NOPB reliable?
The price and inventory of LM2676T-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 LM2676T-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676T-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676T-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676T-12/NOPB?
LM2676T-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676T-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 LM2676T-12/NOPB?
For technical support, including LM2676T-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676T-12/NOPB requirements.
6.How does Aetrix verify that LM2676T-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676T-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 LM2676T-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676T-12/NOPB?
All LM2676T-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676T-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 LM2676T-12/NOPB part is unused and in its original packaging.
Return procedure for LM2676T-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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