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Texas Instruments LM2676SDX-5.0/NOPB
- Part No.:
- LM2676SDX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:7,952
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Product details
Overview
LM2676SDX-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) switching regulator IC delivering up to 3A output current with fixed 5V output, 260kHz fixed-frequency operation, ±2% output voltage tolerance over full 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 LM2676SDX-5.0/NOPB datasheet, LM2676SDX-5.0/NOPB pinout, LM2676SDX-5.0/NOPB application, or LM2676SDX-5.0/NOPB equivalent, key selection criteria include its 3A continuous output capability, thermal performance in TO-263 (KTW) package, 50µA shutdown quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes in buck converter designs.
Technical Context
The LM2676SDX-5.0/NOPB implements a fixed-frequency PWM-controlled buck topology using an integrated 150mΩ DMOS high-side switch and internal 260kHz oscillator. Its feedback loop senses output voltage directly at the FB pin (shorted to VOUT for fixed 5V versions), enabling regulation without external resistor dividers.
It features built-in thermal shutdown, cycle-by-cycle current limiting (typ. 4.5A), and an active-low enable function via the ON/OFF pin with 1.4V threshold and 20µA input bias. The device operates across –40°C to +125°C junction temperature and supports stable operation with standard ceramic or tantalum output capacitors and shielded power inductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over full line, load, and –40°C to 125°C junction temperature - ensures stable rail for microcontrollers and logic without trimming. |
| Max Output Current | 3A continuous - supports mid-power embedded systems without external current boosting. |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial and automotive supply rails after transient suppression. |
| Switching Frequency | 260kHz ±11% - enables use of compact, off-the-shelf 33µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 88% at VIN=12V, IOUT=3A - minimizes thermal load in enclosed enclosures and extends battery runtime in portable 12V-powered devices. |
| Quiescent Current | 50µA in shutdown (ON/OFF = LOW) - enables ultra-low-power system sleep states without auxiliary LDOs. |
| RDS(ON) | 0.15Ω typical - reduces conduction loss and thermal rise at full load, supporting TO-263 thermal performance up to 125°C ambient with PCB copper area. |
Pinout & Package
LM2676SDX-5.0/NOPB is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad. The package measures 10.1mm × 15.24mm and requires soldering the DAP (drain attach pad) to a minimum 0.136 in² copper area for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET; connects 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 local 100nF ceramic + bulk capacitor within 5mm - critical for stability and ripple suppression. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor to generate gate drive voltage above VIN - enables full enhancement of internal high-side FET. |
| 4 (GND) | Power ground | Main return path for IN, SW, and FB; must tie to large copper plane and connect CIN/COUT grounds directly - prevents noise coupling into feedback path. |
| 5 (NC) | No connect | Internally unconnected; leave floating - no routing or thermal connection required. |
| 6 (FB) | Feedback sense | Direct short to VOUT for fixed 5V version - eliminates external resistor network and associated tolerance drift or noise pickup. |
| 7 (ON/OFF) | Enable control | Logic-level enable input (1.4V threshold); pull LOW to enter 50µA shutdown - supports microcontroller-controlled power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables 3A output without external MOSFETs or gate drivers - reduces BOM count and layout complexity in space-constrained designs. |
| Fixed 260kHz oscillator | Eliminates need for external timing components and simplifies EMI filtering - allows predictable frequency placement for compliance testing. |
| ±2% output tolerance | Guarantees 4.9V–5.1V output across all operating conditions - meets tight supply requirements for 5V logic, analog sensors, and USB peripherals. |
| Thermal shutdown & current limit | Protects against overload, short-circuit, and overheating without external circuitry - ensures robust field operation in unattended equipment. |
| ON/OFF pin with 50µA standby | Supports hardware-based power gating for system-level energy management - enables deep-sleep modes in battery-backed meters and controllers. |
Applications
| Industrial Power Supply | Smart Metering System |
|---|---|
|
Use Scenario: Providing regulated 5V rail for microcontroller, RTC, and communication ICs in DIN-rail mounted PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V DC bus to clean 5V supply - handles dynamic load steps during CAN bus arbitration and sensor polling. Use Value: 88% efficiency at 3A reduces heat buildup in sealed enclosures; 260kHz switching avoids interference with 4–20mA analog signal paths. |
Use Scenario: Powering metrology ASIC, LCD display, and RF transceiver in single-phase electricity meters operating from 12V backup battery or rectified AC. IC Role / Device Role / Timing Role: Main 5V supply with ON/OFF control synchronized to meter wake-up intervals - maintains <50µA system standby when idle. Use Value: Fixed 5V output eliminates calibration drift; ±2% tolerance ensures accurate ADC reference and real-time clock accuracy. |
| Motor Drive Control Board | Communications Module |
|
Use Scenario: Generating isolated 5V logic supply for gate drivers and position encoder interfaces in 24V brushless motor controllers. IC Role / Device Role / Timing Role: Secondary non-isolated 5V regulator downstream of main DC-DC stage - supplies digital control logic and fault monitoring circuits. Use Value: 3A rating supports simultaneous activation of multiple Hall sensors and SPI peripherals; thermal shutdown prevents latch-up during stall events. |
Use Scenario: Powering baseband processor, memory, and cellular modem in LTE-enabled remote telemetry units powered by 12V vehicle battery. IC Role / Device Role / Timing Role: Primary 5V rail with fast load transient response - sustains voltage during burst data transmission without brownout. Use Value: 260kHz fixed frequency enables predictable ripple filtering; 8V–40V input range accommodates cold-crank and load-dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675MX-5.0/NOPB | 2A output current, same 5V fixed output, identical pinout and package (SOIC-8), but lower current rating and 260kHz frequency. | Suitable only for sub-2A loads; lacks thermal margin for sustained 3A operation in high-ambient environments. | Select when board space or cost constraints favor SOIC-8 and peak load remains ≤2A. |
| LMR51430RNXR | 3A synchronous buck with 4.5–36V input, 500kHz/1.1MHz selectable frequency, integrated high/low-side FETs, and 95% efficiency. | Requires different compensation and layout; no ON/OFF pin - uses EN with active-high logic and 1.2V threshold. | Choose for higher efficiency, smaller solution size, and modern design-in - but requires redesign of feedback and thermal layout. |
Compared with LM2676SDX-5.0/NOPB, LM2675MX-5.0/NOPB offers footprint compatibility at reduced current capacity, while LMR51430RNXR delivers superior efficiency and integration at the cost of pinout and control interface changes - making LM2676SDX-5.0/NOPB optimal for legacy 3A buck upgrades requiring minimal layout change and proven thermal reliability in TO-263.
Availability
LM2676SDX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, smart metering systems, and motor drive control boards requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM2676SDX-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in non-isolated DC-DC buck conversion, emphasizing minimal external components, wide input range, and rugged operation in harsh environments.
FAQ
What is the maximum continuous output current of the LM2676SDX-5.0/NOPB?
The LM2676SDX-5.0/NOPB delivers up to 3A continuous output current under recommended operating conditions (TJ ≤ 125°C, adequate PCB copper area). This rating assumes proper thermal management using the TO-263 package's exposed DAP connected to ≥0.136 in² of 1 oz copper. Derating applies above 85°C ambient.
Does the LM2676SDX-5.0/NOPB require external feedback resistors?
No. The LM2676SDX-5.0/NOPB is a fixed 5V output variant - its FB pin is internally connected to the output regulation amplifier, so it must be shorted directly to the output capacitor. External resistors are only required for the adjustable version (LM2676SX-ADJ/NOPB).
What is the purpose of the CB pin on the LM2676SDX-5.0/NOPB?
The CB (bootstrap capacitor) pin on the LM2676SDX-5.0/NOPB connects to a 100nF ceramic capacitor between CB and the SW pin. This forms a charge pump that generates a gate drive voltage ~VIN + 10V, ensuring full enhancement of the internal high-side DMOS FET and minimizing RDS(ON) conduction loss.
Can the LM2676SDX-5.0/NOPB operate with an input voltage below 8V?
No. The absolute minimum recommended input voltage is 8V per the datasheet's Recommended Operating Conditions. Operation below 8V may result in dropout, unstable regulation, or failure to start - the internal bias circuitry and DMOS switch require sufficient headroom for reliable gate drive and control loop operation.
How does the ON/OFF pin function on the LM2676SDX-5.0/NOPB?
The ON/OFF pin on the LM2676SDX-5.0/NOPB enables hardware-controlled shutdown: pulling it below 0.8V disables switching and reduces quiescent current to 50µA. It has an internal ~20µA pull-up and 7V Zener clamp. Leaving it open or tying it to VIN enables normal operation - no external pull-up is required.
LM2676SDX-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)
LM2676SDX-5.0/NOPB FAQ
1.How can I place an order for LM2676SDX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-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 LM2676SDX-5.0/NOPB reliable?
The price and inventory of LM2676SDX-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 LM2676SDX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SDX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-5.0/NOPB?
LM2676SDX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-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 LM2676SDX-5.0/NOPB?
For technical support, including LM2676SDX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2676SDX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-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 LM2676SDX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SDX-5.0/NOPB?
All LM2676SDX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-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 LM2676SDX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2676SDX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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