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Texas Instruments LM2676SD-5.0/NOPB
- Part No.:
- LM2676SD-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SD-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:320
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Product details
Overview
LM2676SD-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output current with fixed 5.0V output, 260kHz fixed-frequency operation, ±2% output voltage tolerance over line/load/temperature, and 8V–40V input range. It integrates a 150mΩ DMOS high-side switch and supports ON/OFF control for low-power standby mode.
For engineers reviewing the LM2676SD-5.0/NOPB datasheet, LM2676SD-5.0/NOPB pinout, LM2676SD-5.0/NOPB application, or LM2676SD-5.0/NOPB equivalent, key selection criteria include its fixed 5V output configuration, TO-263-7 (KTW) thermal performance, 50µA shutdown quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes in industrial power supply designs.
Technical Context
The LM2676SD-5.0/NOPB implements a voltage-mode PWM controller with a fixed 260kHz internal oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses an internal resistor divider for 5.0V regulation, eliminating external resistors - unlike the adjustable version requiring FB pin connection to a voltage divider.
It operates in continuous conduction mode (CCM) under typical loads ≥100mA and includes thermal shutdown, cycle-by-cycle current limiting (3.6–5.4A), and precise ON/OFF threshold (0.8–2.0V) enabling reliable enable/disable sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over –40°C to 125°C junction temperature, 8V–40V input, 100mA–3A load - ensures stable logic rail generation without external feedback components. |
| Switching Frequency | 260kHz fixed (±11%) - enables use of compact, standardized inductors (e.g., 33µH) and reduces EMI compared to lower-frequency alternatives. |
| Max Output Current | 3A continuous - supports mid-power applications like motor drivers and communication modules without external current boosting. |
| Efficiency | 88% typical at VIN=12V, IOUT=3A - minimizes thermal dissipation in enclosed industrial enclosures with limited airflow. |
| Quiescent Current | 50µA in shutdown (ON/OFF = 0V) - enables battery-backed systems to maintain >1-year standby life on small Li coin cells. |
| Input Voltage Range | 8V to 40V - accommodates wide-input industrial supplies (e.g., 24V nominal with transients) without pre-regulation. |
| Thermal Resistance | RθJA = 56°C/W (KTW package, 0.136 in² copper) - defines minimum PCB copper area required to sustain 3A at 125°C ambient. |
Pinout & Package
LM2676SD-5.0/NOPB is packaged in TO-263-7 (KTW), a thermally enhanced surface-mount variant of the DDPAK with exposed die attach pad soldered to PCB ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET; connects directly to inductor and cathode of external Schottky diode - must be routed with minimal loop area to reduce EMI. |
| 2 (IN) | Input supply | High-current input path for VIN (8–40V); requires low-ESR bulk capacitor placed <2mm from pin to suppress switching noise. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor to generate gate drive voltage >VIN for full FET enhancement - critical for low RDS(on) operation. |
| 4 (GND) | Power ground | Main return path for IN, SW, and FB; must tie to large copper pour connected to DAP (exposed pad) for thermal and electrical stability. |
| 5 (NC) | No connect | Internally unconnected; must remain floating - no routing or soldering permitted. |
| 6 (FB) | Feedback sense | Internally tied to 5V divider; for fixed-output version, connect directly to output capacitor - no external resistors needed. |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V = active regulation, ≤0.8V = shutdown (50µA IQ); internal 20µA pull-up allows open-circuit enable. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Reduces conduction losses at 3A, enabling >88% efficiency without external MOSFETs or complex gate drive circuitry. |
| Fixed 5.0V output with internal feedback divider | Eliminates external resistor network, reducing BOM count and layout sensitivity while maintaining ±2% accuracy across temperature. |
| 260kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing - avoids frequency jitter issues found in variable-frequency regulators. |
| Thermal shutdown + current limit | Protects against sustained overload or poor heatsinking by halting switching until junction temperature falls below 165°C. |
| 50µA shutdown quiescent current | Supports ultra-low-power wake-on-event architectures where main power rails are disabled between operational cycles. |
Applications
| Communication Module Power | Electricity Meter Auxiliary Supply |
|---|---|
|
Use Scenario: Providing isolated 5V rail for RS-485 transceivers and microcontroller peripherals in DIN-rail mounted smart meters. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V DC bus to clean, regulated 5V for digital logic and interface ICs. Use Value: Delivers 3A headroom for burst-mode radio transmission while maintaining ±2% output stability across –25°C to 70°C operating range. |
Use Scenario: Generating auxiliary 5V supply from rectified AC mains for metrology ASICs and real-time clocks in revenue-grade electricity meters. IC Role / Device Role / Timing Role: Main DC-DC converter powering metering SoC and LCD driver from high-voltage DC bus derived from AC input. Use Value: Withstands 40V input transients during lightning surges and maintains regulation during brownouts down to 8V input. |
| Motor Drive Logic Supply | Calling Button Panel Power |
|
Use Scenario: Supplying 5V to gate drivers, position sensors, and MCU in 24V-powered BLDC motor controllers for HVAC actuators. IC Role / Device Role / Timing Role: Secondary power stage providing isolated logic voltage independent of high-current motor switching noise. Use Value: 260kHz switching frequency avoids interference with motor commutation timing; thermal shutdown prevents latch-up during stall conditions. |
Use Scenario: Powering LED indicators, tactile switches, and low-power MCU in building intercom call panels powered from 24V PoE injectors. IC Role / Device Role / Timing Role: Compact, efficient 5V source enabling slim-profile enclosure design with minimal heatsinking. Use Value: TO-263-7 package dissipates 1.2W at full load with only 56°C/W θJA, allowing operation in sealed plastic housings up to 60°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675SD-5.0/NOPB | 2.5A output current, same 260kHz frequency and pinout - lower current rating with identical thermal footprint. | Suitable for <2.5A loads where reduced cost and lower thermal demand are prioritized over 3A headroom. | Select when peak load remains ≤2.2A and board space/thermal budget constraints favor smaller solution size. |
| TPS54302DDAR | 3A synchronous buck, 2.5–6V input, 500kHz–2.2MHz adjustable frequency - requires external compensation but offers higher efficiency at light loads. | Better suited for battery-powered or low-noise applications where variable frequency and synchronous rectification improve partial-load efficiency. | Choose when input voltage is <8V or when >90% efficiency at 100mA load is required - not a drop-in replacement due to different pinout and control architecture. |
Compared with LM2675SD-5.0/NOPB, LM2676SD-5.0/NOPB delivers 20% higher output current in identical TO-263-7 packaging; versus TPS54302DDAR, it offers simpler design with fixed frequency and no external compensation but trades off light-load efficiency and input voltage flexibility.
Availability
LM2676SD-5.0/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, smart electricity meters, building automation panels, and communication infrastructure requiring stable component supply with long lifecycle support.
Supply support for LM2676SD-5.0/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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and communications markets.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for robust, easy-to-implement DC-DC conversion in cost-sensitive industrial applications where reliability, thermal resilience, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2676SD-5.0/NOPB?
The absolute maximum input voltage for LM2676SD-5.0/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe SOA limits during transients, and TI specifies 40V as the upper bound for guaranteed performance across temperature and load conditions per the datasheet's Recommended Operating Conditions table.
Does LM2676SD-5.0/NOPB require external feedback resistors?
No, LM2676SD-5.0/NOPB does not require external feedback resistors. As a fixed 5.0V output variant, it contains an internal precision resistor divider connected to the FB pin. The FB pin must be connected directly to the output capacitor - no external components are needed for voltage setting, simplifying layout and improving accuracy.
What thermal performance can be expected from LM2676SD-5.0/NOPB in TO-263-7 package?
In the KTW (TO-263-7) package, LM2676SD-5.0/NOPB achieves RθJA = 56°C/W with 0.136 in² copper area and 29°C/W with 12 vias to inner ground layer. At 3A output and 12V input, typical power dissipation is ~1.2W - resulting in ~67°C junction rise above ambient with minimal copper, well within the –40°C to 125°C operating range.
Can LM2676SD-5.0/NOPB be synchronized to an external clock?
No, LM2676SD-5.0/NOPB cannot be synchronized to an external clock. It uses an internal fixed-frequency 260kHz oscillator with ±11% tolerance. There is no SYNC pin or frequency adjustment capability - unlike newer TI regulators such as the TPS54302, which supports external synchronization and programmable switching frequency.
What is the purpose of the NC pin (Pin 5) on LM2676SD-5.0/NOPB?
Pin 5 on LM2676SD-5.0/NOPB is a no-connect (NC) terminal - it is internally unconnected and serves no electrical function. It must remain unconnected on the PCB; routing traces to or placing solder on Pin 5 may cause mechanical stress or unintended coupling, potentially degrading thermal or EMI performance.
LM2676SD-5.0/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):
- 5V
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2676SD-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SD-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2676SD-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SD-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SD-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SD-5.0/NOPB?
LM2676SD-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SD-5.0/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-5.0/NOPB?
For technical support, including LM2676SD-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SD-5.0/NOPB requirements.
6.How does Aetrix verify that LM2676SD-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SD-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SD-5.0/NOPB?
All LM2676SD-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SD-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2676SD-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2676SD-5.0/NOPB Tags
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