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Texas Instruments LM2674LD-ADJ
- Part No.:
- LM2674LD-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2674LD-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,722
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Product details
Overview
LM2674LD-ADJ from Texas Instruments is a monolithic 500 mA step-down (buck) DC-DC switching regulator in 16-pin LLP package, featuring a fixed 260 kHz oscillator, internal DMOS switch with 0.25 Ω RDS(ON), and adjustable output voltage range of 1.21 V to 37 V. It delivers >90% efficiency across 8 V–40 V input, supports TTL shutdown, and is used in industrial power supplies requiring compact, high-efficiency regulation.
For engineers reviewing the LM2674LD-ADJ datasheet, LM2674LD-ADJ pinout, LM2674LD-ADJ application, or LM2674LD-ADJ equivalent, key selection criteria include feedback voltage tolerance (±1.5%), guaranteed 500 mA load current, thermal shutdown protection, 260 kHz fixed-frequency operation, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2674LD-ADJ implements a synchronous-buck topology using an integrated DMOS power switch and patented internal frequency compensation (U.S. Pat. Nos. 5,382,918 and 5,514,947). Its feedback loop references a precise 1.21 V internal bandgap, enabling stable output programming via external resistor divider.
It operates in continuous conduction mode (CCM) over full load range, features cycle-by-cycle current limiting, thermal shutdown at +150°C junction temperature, and standby quiescent current as low as 50 μA during shutdown-making it suitable for battery-backed or energy-sensitive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 500 mA continuous load capability without derating at TJ ≤ +125°C |
| Input Voltage Range | 6.5 V to 40 V - supports wide industrial input rails including 12 V, 24 V, and 36 V systems |
| Feedback Voltage | 1.21 V ±1.5% - sets output accuracy baseline; enables 1.21 V–37 V programmability with external resistors |
| Switching Frequency | 260 kHz ±10% - enables use of small, low-cost filter inductors and capacitors |
| Efficiency | Up to 90% at 12 VIN/5 VOUT/500 mA - minimizes board-level heat dissipation; copper traces suffice as heatsink |
| RDS(ON) | 0.25 Ω typical - reduces conduction loss in high-current buck stage |
| Shutdown Current | 50 μA typical - enables ultra-low-power standby in always-on systems |
Pinout & Package
LM2674LD-ADJ uses 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 |
|---|---|---|
| GND | Power and signal ground reference | Common return path for switch, feedback, and control circuits; must connect to large PCB copper area for thermal management |
| VIN | Main input supply connection | Accepts 6.5 V–40 V DC; requires local 22 μF tantalum bypass capacitor near pin |
| VOUT | Regulated output node | Connects to output inductor and capacitor; carries high-frequency ripple current |
| SW | Internal switch drain terminal | Drives external catch diode and inductor; switches at 260 kHz with 0.25 Ω on-resistance |
| FB | Feedback input | Senses output via resistor divider; 1.21 V reference sets regulation point; bias current <85 nA minimizes divider error |
| ON/OFF | Enable/shutdown control | TTL-compatible; <0.8 V disables regulator (50 μA standby); >2.0 V enables; internally pulled up to 7 V |
| BOOST | Bootstrap capacitor connection | Supports gate drive of internal DMOS switch; requires 0.01 μF ceramic capacitor between BOOST and SW |
Key Features
| Feature | Design Value |
|---|---|
| Patented internal compensation | Eliminates need for external compensation network - simplifies design and improves stability across line/load/temperature |
| Adjustable output range | 1.21 V to 37 V via two-resistor divider - supports diverse system rail requirements without redesign |
| Thermal shutdown + current limit | Full fault protection under overload, short-circuit, or ambient overheating - prevents device destruction |
| Standard inductor compatibility | Works with off-the-shelf 47–150 μH inductors from Schott, Renco, Pulse, Coilcraft - accelerates BOM sourcing |
| Low EMI layout support | Fixed 260 kHz frequency and integrated switch reduce spectral spreading - eases EMC compliance |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V vehicle battery powers 5 V microcontroller and CAN transceiver in door module. IC Role / Device Role / Timing Role: Primary buck regulator converting 8–36 V automotive input to stable 5 V output. Use Value: 90% efficiency at 500 mA reduces thermal stress in sealed enclosure; 260 kHz allows compact 47 μH inductor and 68 μF tantalum output cap. | Use Scenario: DIN-rail mounted PLC I/O module converts 24 V DC to 3.3 V for FPGA and ADC interface. IC Role / Device Role / Timing Role: Adjustable buck converter configured for 3.3 V output with tight ±1.5% regulation. Use Value: Guaranteed 500 mA output current supports multiple peripherals; thermal shutdown protects against ambient temperatures up to +70°C. |
| Point-of-Load Converter | Test Equipment Power Rail |
Use Scenario: Benchtop multimeter requires isolated 15 V analog front-end supply derived from 28 V internal bus. IC Role / Device Role / Timing Role: Programmable buck regulator set to 15 V output using 1 kΩ/11.5 kΩ resistor divider. Use Value: 1.21 V feedback reference enables accurate 15 V (±22.7 mV) output; low 50 μA shutdown current preserves battery life during sleep mode. | Use Scenario: Portable oscilloscope uses 12 V Li-ion pack to generate 3.3 V, 5 V, and ±12 V rails. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding linear regulators for noise-sensitive analog sections. Use Value: >90% efficiency extends battery runtime; 260 kHz switching avoids audible noise and simplifies filtering for clean analog supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2674M-ADJ | SO-8 package; higher θJA (105°C/W vs. ~50°C/W for LLP); same electrical specs | Less thermal performance in high-power density layouts; requires larger PCB area for heatsinking | Select when SO-8 footprint is mandated or reflow compatibility with legacy assembly lines is required |
| LM2675SD-ADJ | Higher 1 A output current; 260 kHz frequency; improved light-load efficiency; 16-pin WSON package | Supports higher current loads but requires updated inductor/capacitor sizing and layout review | Choose when future-proofing for 750–1000 mA loads or tighter output ripple is needed |
Compared with LM2674M-ADJ, the LM2674LD-ADJ offers superior thermal performance in space-constrained designs; compared with LM2675SD-ADJ, it provides proven reliability at lower cost and simpler BOM for 500 mA applications without needing higher current headroom.
Availability
LM2674LD-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2674LD-ADJ 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 and high-reliability industrial solutions.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for engineers seeking easy-to-use, high-efficiency DC-DC buck converters that minimize external component count while delivering robust performance in harsh environments.
FAQ
What is the minimum input voltage required for stable operation of the LM2674LD-ADJ?
The LM2674LD-ADJ has a specified operating input voltage range of 6.5 V to 40 V. Below 6.5 V, the internal circuitry may not sustain regulation or switching action. For reliable startup and dropout margin, design with ≥7 V minimum input under worst-case conditions including line drop and ripple. The LM2674LD-ADJ maintains regulation down to this threshold while delivering full 500 mA load current.
How do I calculate the output voltage setting resistors for the LM2674LD-ADJ?
Use the formula VOUT = 1.21 V × (1 + R2/R1), where R1 connects FB to GND and R2 connects VOUT to FB. Select R1 between 240 Ω and 1.5 kΩ (1% metal film recommended); then solve for R2. For example, for 12 V output: R2 = R1 × (12/1.21 − 1) ≈ R1 × 8.91. With R1 = 1 kΩ, R2 = 8.91 kΩ → use 8.87 kΩ (1%). The LM2674LD-ADJ relies on this precise 1.21 V reference for accuracy.
Does the LM2674LD-ADJ require an external catch diode, and what type is recommended?
Yes, the LM2674LD-ADJ requires an external Schottky catch diode connected between SW and VOUT. Recommended types include IR 30WQ05F (50 V, 3.3 A) or equivalent 3 A–5 A, ≤50 V Schottky diodes with low forward voltage (<0.5 V) and fast recovery. The LM2674LD-ADJ does not integrate a synchronous rectifier, so diode selection directly impacts efficiency and thermal performance.
What is the thermal performance difference between the LM2674LD-ADJ (LLP) and LM2674M-ADJ (SO-8)?
The LM2674LD-ADJ in 16-pin LLP has significantly better thermal resistance than the SO-8 version: typical θJA is ~50°C/W with 1 in² copper, versus 105°C/W for the SO-8. This allows the LM2674LD-ADJ to sustain full 500 mA output at higher ambient temperatures without derating. The LLP's exposed thermal pad must be soldered to a solid copper plane for optimal performance - a key design requirement for the LM2674LD-ADJ.
Can the LM2674LD-ADJ be used in discontinuous conduction mode (DCM), and how does it affect regulation?
Yes, the LM2674LD-ADJ operates naturally in DCM at light loads (<100 mA), with no control loop instability. Regulation remains within ±1.5% over full line/load/temperature, as verified in Electrical Characteristics tables. DCM reduces light-load quiescent current and improves efficiency below ~15% load, but increases output voltage ripple slightly - a trade-off confirmed in the LM2674LD-ADJ's Typical Performance Characteristics curves.
LM2674LD-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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)
LM2674LD-ADJ FAQ
1.How can I place an order for LM2674LD-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674LD-ADJ 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 LM2674LD-ADJ reliable?
The price and inventory of LM2674LD-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674LD-ADJ is usually 5 days.
3.What payment methods are accepted for LM2674LD-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674LD-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674LD-ADJ?
LM2674LD-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674LD-ADJ 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 LM2674LD-ADJ?
For technical support, including LM2674LD-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674LD-ADJ requirements.
6.How does Aetrix verify that LM2674LD-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2674LD-ADJ 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 LM2674LD-ADJ meets industry standards.
7.What is the process for return or replacement of LM2674LD-ADJ?
All LM2674LD-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2674LD-ADJ, 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 LM2674LD-ADJ part is unused and in its original packaging.
Return procedure for LM2674LD-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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