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Texas Instruments LM2674M-3.3/NOPB
- Part No.:
- LM2674M-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674M-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,791
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Product details
Overview
LM2674M-3.3/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering 500mA output current with ±1.5% output voltage tolerance, 260kHz fixed switching frequency, and 8V–40V input range-designed for compact, high-efficiency buck regulation in industrial power supplies.
For engineers reviewing the LM2674M-3.3/NOPB datasheet, LM2674M-3.3/NOPB pinout, LM2674M-3.3/NOPB application, or LM2674M-3.3/NOPB equivalent, key selection criteria include its 3.3V fixed output, SOIC-8 package, thermal shutdown protection, 0.25Ω internal DMOS switch, and TTL-compatible enable control with 50μA standby current.
Technical Context
The LM2674M-3.3/NOPB integrates a 0.25Ω DMOS high-side switch, internal 260kHz oscillator, and patented frequency compensation-enabling stable operation with only five external components. It uses bootstrap capacitor (CB) biasing for gate drive and regulates via direct output sensing (FB pin shorted to VOUT).
Its functional modes include active regulation above 1.4V ON/OFF threshold and low-power shutdown below that level, with cycle-by-cycle current limiting (0.62–1.2A), thermal shutdown, and 50μA typical standby quiescent current-making it suitable for thermally constrained embedded systems requiring robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line/load/temperature - ensures stable logic rail generation without feedback divider. |
| Max Output Current | 500mA DC - supports mid-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates unregulated 12V/24V industrial rails and automotive battery variations. |
| Switching Frequency | 260kHz fixed - enables use of small, standard inductors (e.g., 68µH) and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω typical at 25°C - minimizes conduction loss and simplifies thermal design; copper PCB traces suffice as heatsink. |
| Quiescent Current | 3.6mA typical in active mode; 50μA in shutdown - extends battery life in always-on monitoring systems. |
| Oscillator Tolerance | ±10% - ensures predictable filter sizing and consistent transient response across temperature. |
Pinout & Package
LM2674M-3.3/NOPB is supplied in an 8-pin SOIC (D) package (4.9mm × 6mm), with exposed pad not present. Pin functions are validated per TI SNVS007I Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 10nF ceramic capacitor to VSW to generate gate drive voltage for internal high-side FET. |
| FB (Pin 4) | Feedback sense input | Internally tied to output for fixed 3.3V version; omission of external divider simplifies layout and improves stability. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible; >1.4V enables regulation, <0.8V disables with 50μA standby current-supports microcontroller-controlled power sequencing. |
| VSW (Pin 8) | Switch node output | Drives external catch diode and inductor; high dv/dt node requiring tight loop area and ground shielding. |
| GND (Pin 6) | Power ground | Primary return path for input/output capacitors and inductor; must be connected with shortest possible trace to minimize noise coupling. |
| VIN (Pin 7) | Input supply | Accepts 8–40V; requires local 22µF tantalum bypass capacitor with low-ESR and minimal trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25Ω DMOS switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while maintaining >86% efficiency at 12V→3.3V/500mA. |
| Fixed 3.3V output configuration | Removes FB resistor divider, improving accuracy, reducing component count, and enhancing long-term reliability in space-constrained designs. |
| 260kHz fixed-frequency oscillator | Enables predictable EMI filtering and consistent inductor sizing-compatible with off-the-shelf 68µH shielded inductors from Schott, Renco, Pulse, and Coilcraft. |
| TTL shutdown with 50μA standby | Allows low-power sleep modes in portable or sensor-edge devices; pin can be left floating for always-on operation due to internal 7V pull-up. |
| Thermal + current limit protection | Prevents damage during overload or ambient temperature rise; automatic recovery after fault removal-no manual reset required. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor interfaces in DIN-rail mounted controllers with 24V bus input. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying MCU core, CAN transceivers, and ADC reference-replacing linear regulators to reduce heat dissipation. Use Value: Delivers 500mA at >86% efficiency, eliminating need for heatsinks and enabling conformal coating in harsh environments. | Use Scenario: Generating 3.3V rail for microcontroller, LIN transceiver, and EEPROM in door module electronics with wide battery voltage range (9–16V nominal, up to 40V load dump). IC Role / Device Role / Timing Role: Non-synchronous buck converter with integrated switch and thermal protection-providing regulated logic power independent of engine cranking dips. Use Value: Withstands 40V transients and maintains regulation down to 8V input, ensuring uninterrupted operation during cold-cranking events. |
| Medical Point-of-Care Monitor | IoT Gateway Power Subsystem |
Use Scenario: Supplying 3.3V to ARM Cortex-M based main processor, display controller, and wireless co-processor in portable diagnostic equipment. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter enabling extended battery runtime; enabled/disabled via host MCU GPIO for system-level power management. Use Value: 50μA shutdown current and 3.6mA operating IQ extend Li-ion battery life; SOIC-8 footprint allows easy rework and automated assembly. | Use Scenario: Providing clean 3.3V power to Wi-Fi/BLE SoC, environmental sensors, and secure element in smart home hub with 12V wall adapter input. IC Role / Device Role / Timing Role: Fixed-output buck regulator with minimal external components-reducing bill-of-materials and PCB area while meeting Class B conducted EMI limits. Use Value: 260kHz switching frequency avoids AM radio band; integrated compensation eliminates tuning effort during qualification testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675M-3.3/NOPB | Same pinout and function but rated for 1A output current; higher RDS(ON) (0.35Ω) and 100kHz switching frequency. | Better suited for higher-current loads (>500mA); larger inductor/capacitor requirements due to lower frequency. | Select when future design scalability to 1A is needed; verify thermal margin with 0.35Ω switch loss. |
| TPS54331DR | Synchronous buck with 3A rating, 570kHz switching, and adjustable output; requires external feedback resistors and has different pinout. | Higher efficiency at light loads; supports dynamic voltage scaling but increases design complexity and cost. | Choose for >90% efficiency across wider load range or when programmable output is required-requires full schematic/layout revision. |
Compared with LM2675M-3.3/NOPB, the LM2674M-3.3/NOPB offers higher switching frequency and lower RDS(ON) for compact 500mA designs; versus TPS54331DR, it trades efficiency and flexibility for simplicity, cost, and drop-in compatibility in legacy SOIC-8 layouts.
Availability
LM2674M-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical diagnostics, and IoT edge devices requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2674M-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, space-constrained DC-DC applications where minimal external components and proven reliability are critical.
FAQ
What is the maximum input voltage rating for LM2674M-3.3/NOPB?
The absolute maximum input voltage for LM2674M-3.3/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe junction temperature or triggering overvoltage protection. For automotive load-dump scenarios up to 40V, the device remains fully functional with proper input capacitance and thermal layout-verified in TI SNVS007I Rev JUNE 2025 Section 5.1 and 5.3.
Does LM2674M-3.3/NOPB require an external feedback resistor network?
No, LM2674M-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its FB pin is internally configured for 3.3V regulation-requiring only a direct connection to the output capacitor. This eliminates resistor tolerance errors and layout sensitivity, distinguishing it from the adjustable LM2674MX-ADJ versions which mandate a precision divider.
What package type is used for LM2674M-3.3/NOPB?
LM2674M-3.3/NOPB is packaged in an 8-pin SOIC (D package), measuring 4.9mm × 6mm, with no exposed thermal pad. This surface-mount package is compatible with standard reflow profiles and supports automated optical inspection-confirmed in TI's Package Information table and Mechanical Drawing SLMA007.
How does the ON/OFF pin function on LM2674M-3.3/NOPB?
The ON/OFF pin (Pin 5) enables or disables regulation: voltage >1.4V (typical) turns the device on; <0.8V places it in shutdown with 50μA standby current. The pin features an internal 7V pull-up, so leaving it unconnected defaults to active mode-ideal for simple always-on applications without external control logic.
What is the typical efficiency of LM2674M-3.3/NOPB at full load?
LM2674M-3.3/NOPB achieves 86% typical efficiency at VIN = 12V, VOUT = 3.3V, and IOUT = 500mA (per Section 5.5 of SNVS007I). Efficiency rises to ~90% at 5V output and ~94% at 12V output under comparable conditions-reflecting lower relative conduction loss at higher output voltages.
LM2674M-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 8-SOIC
LM2674M-3.3/NOPB FAQ
1.How can I place an order for LM2674M-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674M-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 LM2674M-3.3/NOPB reliable?
The price and inventory of LM2674M-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 LM2674M-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674M-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674M-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674M-3.3/NOPB?
LM2674M-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674M-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 LM2674M-3.3/NOPB?
For technical support, including LM2674M-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674M-3.3/NOPB requirements.
6.How does Aetrix verify that LM2674M-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674M-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 LM2674M-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674M-3.3/NOPB?
All LM2674M-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674M-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 LM2674M-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2674M-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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