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Texas Instruments LM2674LD-3.3/NOPB
- Part No.:
- LM2674LD-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2674LD-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,215
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Product details
Overview
LM2674LD-3.3/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering 500mA at fixed 3.3V output, operating from 8V–40V input with 260kHz fixed-frequency switching, ±1.5% output voltage tolerance, and integrated 0.25Ω DMOS switch. It serves as a primary power stage in industrial and embedded systems requiring compact, high-efficiency buck regulation.
For engineers reviewing the LM2674LD-3.3/NOPB datasheet, LM2674LD-3.3/NOPB pinout, LM2674LD-3.3/NOPB application, or LM2674LD-3.3/NOPB equivalent, key selection considerations include input voltage range (8–40V), output accuracy (±1.5%), thermal performance (RθJA = 105°C/W in SOIC-8), shutdown current (50μA), and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2674LD-3.3/NOPB implements a voltage-mode control architecture with internal frequency compensation and a fixed 260kHz oscillator. Its feedback loop regulates output by comparing FB pin voltage to an internal 1.21V reference - for the fixed 3.3V version, FB is internally tied to VOUT, eliminating external resistors.
It integrates a high-side DMOS switch with 0.25Ω RDS(ON), thermal shutdown, cycle-by-cycle current limiting (0.62–1.2A), and TTL-compatible ON/OFF control enabling low-power standby mode. The bootstrap capacitor (CB) drives the high-side gate, requiring a 10nF ceramic capacitor between CB and VSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line/load/temperature - ensures stable logic rail supply without external feedback divider. |
| Max Output Current | 500mA DC - supports moderate-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates 12V/24V industrial buses and unregulated adapter inputs with margin. |
| Switching Frequency | 260kHz fixed - enables use of small, low-cost 47–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω typical at 25°C - limits conduction loss to ≤63mW at 500mA, minimizing self-heating on PCB copper heatsinking. |
| Standby Current | 50μA typical - allows battery-backed or energy-sensitive systems to maintain ultra-low quiescent power during shutdown. |
| Oscillator Tolerance | ±10% - ensures predictable filter component sizing and consistent transient response across temperature. |
Pinout & Package
LM2674LD-3.3/NOPB is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed pad not present. Thermal performance is specified at RθJA = 105°C/W with ~1 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 10nF ceramic capacitor to VSW; supplies gate drive voltage for internal high-side DMOS switch. |
| NC (Pins 2, 3) | No-connect | Internally unused; must remain unconnected and un-routed on PCB. |
| FB (Pin 4) | Feedback sense input | Internally connected to output for fixed 3.3V version - no external resistor divider required. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible; ≥1.4V enables regulation, <0.8V disables with 50μA standby current. |
| VSW (Pin 8) | Switch node output | Drives external inductor and catch diode cathode; high dv/dt node requiring tight layout and ground return. |
| GND (Pin 6) | Power ground | Main return path for input/output capacitors and switch current; must connect to low-impedance system ground plane. |
| VIN (Pin 7) | Input supply | Accepts 8–40V DC; requires local 22μF tantalum bypass capacitor with short, low-inductance trace to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS switch | 0.25Ω RDS(ON) eliminates need for external MOSFET and driver, reducing BOM count and layout complexity. |
| Fixed 3.3V output configuration | Internal feedback connection removes external resistor network - simplifies design and improves long-term output stability. |
| Thermal + current protection | Auto-recovering thermal shutdown and cycle-by-cycle current limit prevent damage during overload or ambient rise. |
| Simple external component count | Requires only five components: input cap, output cap, inductor, catch diode, and bootstrap cap - accelerates prototyping. |
| WEBENCH® Power Designer support | TI's online tool generates complete schematics, bill-of-materials, efficiency plots, and thermal simulations for LM2674LD-3.3/NOPB designs. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and analog sensor interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator converting 24V bus to logic rail; provides regulated supply independent of load transients. Use Value: ±1.5% output tolerance ensures reliable ADC reference and digital logic operation; 260kHz switching enables compact 47μH inductor footprint. | Use Scenario: Supplying 3.3V to door module MCUs, LIN transceivers, and window motor drivers in 12V automotive subsystems. IC Role / Device Role / Timing Role: Non-isolated buck converter stepping down noisy 12V battery rail to clean 3.3V domain; withstands load dump up to 40V. Use Value: 8–40V input range covers cold-crank (6.5V min per spec) and load-dump events; thermal shutdown protects against under-hood overheating. |
| Medical Point-of-Care Monitor | IoT Edge Gateway |
Use Scenario: Generating 3.3V for ARM Cortex-M based patient monitoring units with isolated USB and Bluetooth connectivity. IC Role / Device Role / Timing Role: Efficient preregulator feeding low-noise LDOs that power analog front-ends and RF sections. Use Value: 90%+ efficiency at 500mA reduces heat buildup in sealed enclosures; 50μA shutdown current extends battery backup runtime. | Use Scenario: Powering Wi-Fi 6 SoC, Ethernet PHY, and environmental sensors in compact, fanless smart building gateways. IC Role / Device Role / Timing Role: Main DC-DC converter sourcing 3.3V rail from 12V PoE midspan or wall adapter. Use Value: SOIC-8 package allows manual rework and automated assembly; fixed 3.3V output eliminates calibration during production test. |
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-3.3/NOPB | Same pinout, 1A output rating, higher RDS(ON) (0.35Ω), identical 260kHz frequency and protection features. | Supports higher load currents but dissipates more heat at 500mA; requires larger thermal copper area. | Select when future-proofing for >500mA loads or when margin for peak current surges is needed. |
| TPS54332DR | 3.5–28V input, 3A output, 1MHz switching, integrated FETs, adjustable output only - no fixed 3.3V variant. | Enables smaller magnetics and faster transient response but requires external feedback resistors and tighter layout control. | Choose for space-constrained designs needing higher current or higher frequency; not drop-in compatible due to different pinout and feedback architecture. |
Compared with LM2674LD-3.3/NOPB, LM2675SD-3.3/NOPB offers headroom for current growth without changing PCB layout, while TPS54332DR trades simplicity and thermal robustness for higher integration and density - making it suitable only where 3A capability and 1MHz operation justify redesign effort.
Availability
LM2674LD-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2674LD-3.3/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 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 LM2674LD-3.3/NOPB?
The absolute maximum input voltage for LM2674LD-3.3/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe junction temperature or triggering internal protection circuits. For sustained 40V operation, ensure adequate PCB copper area (≥1 in²) and ambient temperature ≤85°C to maintain junction temperature below 125°C.
Does LM2674LD-3.3/NOPB require an external feedback resistor network?
No, LM2674LD-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to the 3.3V output node, eliminating the need for a voltage-divider network. This simplifies layout, improves long-term output accuracy, and removes resistor tolerance and drift as error sources - a key advantage over adjustable versions like LM2674MX-ADJ/NOPB.
What is the typical efficiency of LM2674LD-3.3/NOPB at full load?
LM2674LD-3.3/NOPB achieves 86% typical efficiency at VIN = 12V, VOUT = 3.3V, and IOUT = 500mA. Efficiency rises with higher input-to-output voltage ratios (e.g., 90% at 12V→5V) and falls slightly at lower input voltages (e.g., ~78% at 8V→3.3V). These values assume optimized external components: 68μH shielded inductor, 3.3A Schottky catch diode, and low-ESR input/output capacitors.
Can LM2674LD-3.3/NOPB be used in automotive applications?
Yes, LM2674LD-3.3/NOPB is qualified for automotive body electronics per its 8V–40V input range, which covers 12V battery systems including cold-crank (down to 6.5V per spec) and load-dump transients (up to 40V). It includes thermal shutdown and current limiting for under-hood reliability. However, it is not AEC-Q200 qualified - for ASIL-B/C systems, consider TI's automotive-grade alternatives such as LM61480-Q1.
What package type is LM2674LD-3.3/NOPB supplied in?
LM2674LD-3.3/NOPB is supplied in an 8-pin SOIC (D package) with dimensions 4.9mm × 6mm and standard gull-wing leads. It is not offered in PDIP or WSON variants - those correspond to other part numbers (e.g., LM2674N-3.3/NOPB for PDIP, LM2674MH-3.3/NOPB for WSON). The SOIC-8 package supports both manual soldering and automated SMT assembly with IPC-compliant reflow profiles.
LM2674LD-3.3/NOPB 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):
- 3.3V
- 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)
LM2674LD-3.3/NOPB FAQ
1.How can I place an order for LM2674LD-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674LD-3.3/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 LM2674LD-3.3/NOPB reliable?
The price and inventory of LM2674LD-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674LD-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674LD-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674LD-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674LD-3.3/NOPB?
LM2674LD-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674LD-3.3/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 LM2674LD-3.3/NOPB?
For technical support, including LM2674LD-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674LD-3.3/NOPB requirements.
6.How does Aetrix verify that LM2674LD-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674LD-3.3/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 LM2674LD-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674LD-3.3/NOPB?
All LM2674LD-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674LD-3.3/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 LM2674LD-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2674LD-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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