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Texas Instruments LM2674LDX-5.0
- Part No.:
- LM2674LDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2674LDX-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,595
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Product details
Overview
LM2674LDX-5.0 from Texas Instruments is a monolithic 500 mA step-down (buck) switching voltage regulator in LLP package, delivering fixed 5.0 V output with ±1.5% tolerance, 260 kHz fixed-frequency operation, and >90% efficiency at 12 V input/500 mA load. It integrates a 0.25 Ω DMOS power switch, internal frequency compensation, and thermal/current protection for industrial DC-DC conversion.
For engineers reviewing the LM2674LDX-5.0 datasheet, LM2674LDX-5.0 pinout, LM2674LDX-5.0 application, or LM2674LDX-5.0 equivalent, key selection criteria include input voltage range (6.5–40 V), standby current (50 μA), oscillator frequency tolerance (±10%), RDS(ON) (0.25 Ω), and guaranteed 500 mA output capability under full temperature range.
Technical Context
The LM2674LDX-5.0 implements a synchronous-free buck topology using an internal LDMOS power switch and fixed-frequency PWM control. Its patented internal frequency compensation eliminates external compensation components, while the 260 kHz oscillator enables compact LC filter design with standard off-the-shelf inductors.
Operation includes TTL-compatible shutdown (VSH threshold: 0.8–2.0 V), thermal shutdown, cycle-by-cycle current limiting (0.62–1.25 A), and feedback regulation referenced to a 1.21 V internal bandgap. The device requires only five external components: input capacitor, output capacitor, catch diode, inductor, and boost capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over line/load/temperature - ensures stable logic supply without external resistive divider. |
| Max Output Current | 500 mA guaranteed - supports single-rail microcontroller or FPGA core supply with margin. |
| Input Voltage Range | 6.5 V to 40 V - compatible with 12 V/24 V industrial bus, automotive battery, or unregulated AC-DC outputs. |
| Switching Frequency | 260 kHz ±10% - balances EMI performance and inductor size; allows use of low-cost 47–100 μH standard inductors. |
| RDS(ON) | 0.25 Ω typical - minimizes conduction loss; enables >90% efficiency at 12 VIN/5 VOUT/500 mA. |
| Standby Current | 50 μA typical - supports low-power system sleep modes without external enable circuitry. |
| Efficiency | 90% typical at 12 VIN, 500 mA - reduces thermal load; PCB copper traces suffice as heatsink. |
Pinout & Package
LM2674LDX-5.0 is housed in a 16-lead LLP (Leadless Leadframe Package), thermally enhanced surface-mount package with exposed thermal pad. Pin numbering follows top-view orientation per NSC Package Drawing LDA16A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 6.5–40 V DC; requires local 22 μF tantalum bypass capacitor close to pin. |
| GND | Power Ground | Common return for input/output paths and thermal pad connection; must be tied to large copper area. |
| VOUT | Regulated Output | Delivers fixed 5.0 V; connects to output capacitor (e.g., 68–100 μF tantalum) and load. |
| SW | Switch Node | Drives external catch diode and inductor; high dv/dt node requiring short trace routing. |
| FB | Feedback Input | Not used in fixed-output version; internally connected to output; must be left unconnected. |
| ON/OFF | Shutdown Control | TTL-compatible enable; <2.0 V disables regulator (50 μA standby); >2.0 V enables operation. |
| BOOST | Bootstrap Capacitor Terminal | Connects to 0.01 μF ceramic capacitor between SW and BOOST to drive high-side switch gate. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDMOS Power Switch | 0.25 Ω RDS(ON) enables high-efficiency 500 mA buck conversion without external MOSFET. |
| Patented Internal Compensation | Eliminates external compensation network - reduces BOM count and design iteration time. |
| Fixed 260 kHz Oscillator | Enables predictable EMI profile and simplifies EMI filter design using standardized inductor values. |
| Thermal + Current Protection | Auto-recovering thermal shutdown and cycle-by-cycle current limit prevent damage during overload or ambient rise. |
| Low Standby Quiescent Current | 50 μA shutdown current supports battery-backed or energy-sensitive systems. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and sensor interface circuitry in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5 V DC-DC converter stepping down 24 V field bus to logic-level supply. Use Value: 90% efficiency minimizes heat buildup in sealed enclosures; wide 6.5–40 V input accommodates brownout and load-dump transients. | Use Scenario: Generating 5 V rail for microcontrollers, CAN transceivers, and LED drivers in door modules or lighting nodes. IC Role / Device Role / Timing Role: Non-isolated buck regulator supplying core logic voltage from vehicle battery (9–16 V nominal, up to 40 V transient). Use Value: 50 μA shutdown current extends battery life in sleep mode; thermal shutdown protects against under-hood temperature excursions. |
| Point-of-Load Telecom Converter | Medical Diagnostic Equipment Supply |
Use Scenario: Local 5 V generation for FPGA configuration, ADC reference, and interface ICs on high-density telecom line cards. IC Role / Device Role / Timing Role: Compact, efficient point-of-load regulator replacing linear regulators to reduce board-level heat. Use Value: LLP package with thermal pad enables high power density; 260 kHz switching allows small 47–68 μH inductors and low-profile capacitors. | Use Scenario: Providing clean, regulated 5 V for embedded microcontrollers and display controllers in portable ultrasound or patient monitors. IC Role / Device Role / Timing Role: Main system supply regulator meeting IEC 60601 creepage/clearance requirements via external component layout. Use Value: ±1.5% output tolerance ensures reliable digital operation; no external feedback resistors eliminate drift-related calibration errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2674M-5.0 | SO-8 package; higher θJA (105°C/W vs. LLP's ~50°C/W); same electrical specs. | Less thermal performance in high-density layouts; suitable where through-hole or SO-8 footprint exists. | Select when legacy SO-8 layout reuse or hand-soldering is required; verify thermal derating at 500 mA. |
| TPS54302DDCR | 3.5–28 V input; 3 A output; 500 kHz switching; integrated FETs; different pinout and control architecture. | Higher current and frequency; requires new layout and loop compensation; not drop-in. | Choose for future-proof designs needing >500 mA or tighter regulation; not a direct replacement. |
Compared with LM2674M-5.0, the LM2674LDX-5.0 offers superior thermal performance in space-constrained applications due to its LLP package's exposed thermal pad, while TPS54302DDCR provides higher output current and frequency at the cost of layout redesign and increased complexity.
Availability
LM2674LDX-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2674LDX-5.0 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, with decades of expertise in high-reliability power conversion ICs.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and proven reliability are critical.
FAQ
What is the maximum input voltage rating for the LM2674LDX-5.0?
The absolute maximum input voltage for the LM2674LDX-5.0 is 45 V, but the recommended operating range is 6.5 V to 40 V. Exceeding 40 V may trigger internal protection or degrade long-term reliability. The device maintains regulation and specified performance across this full 6.5–40 V span, making it suitable for 24 V industrial systems with transient overvoltage tolerance.
Does the LM2674LDX-5.0 require external feedback resistors?
No, the LM2674LDX-5.0 does not require external feedback resistors. As a fixed-output variant, its 5.0 V regulation is implemented internally; the FB pin is pre-connected and must remain unconnected in the circuit. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like LM2674LD-ADJ.
What is the thermal resistance (θJA) of the LM2674LDX-5.0 in its LLP package?
The LM2674LDX-5.0's θJA is highly dependent on PCB layout but typically ranges from 45°C/W to 65°C/W with ≥1 in² of 2-oz copper connected to the exposed thermal pad and multiple thermal vias. Unlike SO-8 or DIP packages, the LLP's thermal performance scales directly with copper area and via count-TI Application Note AN-1187 provides validated layout guidelines for optimal dissipation.
Can the LM2674LDX-5.0 be used in discontinuous conduction mode (DCM)?
Yes, the LM2674LDX-5.0 operates reliably in both continuous and discontinuous conduction modes depending on load and inductor value. At light loads (<100 mA), it naturally transitions to DCM, reducing switching losses and maintaining high efficiency. The datasheet includes DCM waveforms and design guidance for 47–150 μH inductors to optimize ripple and transient response.
What type of catch diode is recommended for use with the LM2674LDX-5.0?
A Schottky diode rated for ≥3 A average current and ≥50 V reverse voltage is recommended-e.g., IR 30WQ05F (50 V, 3.3 A). Schottky diodes minimize forward voltage drop and switching losses, directly improving efficiency. The diode must be placed adjacent to the SW and VOUT pins with minimal trace length to suppress ringing and EMI per TI layout guidelines in the LM2674 datasheet.
LM2674LDX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WSON (5x5)
LM2674LDX-5.0 FAQ
1.How can I place an order for LM2674LDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674LDX-5.0 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 LM2674LDX-5.0 reliable?
The price and inventory of LM2674LDX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674LDX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2674LDX-5.0?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674LDX-5.0?
LM2674LDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674LDX-5.0 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 LM2674LDX-5.0?
For technical support, including LM2674LDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674LDX-5.0 requirements.
6.How does Aetrix verify that LM2674LDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2674LDX-5.0 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 LM2674LDX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2674LDX-5.0?
All LM2674LDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2674LDX-5.0, 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 LM2674LDX-5.0 part is unused and in its original packaging.
Return procedure for LM2674LDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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