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Texas Instruments LM2674M-5.0
- Part No.:
- LM2674M-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674M-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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Product details
Overview
LM2674M-5.0 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. It integrates a 0.25Ω DMOS switch and operates in buck topology for efficient voltage regulation in industrial power supplies.
For engineers reviewing the LM2674M-5.0 datasheet, LM2674M-5.0 pinout, LM2674M-5.0 application, or LM2674M-5.0 equivalent, key selection criteria include fixed 5.0V output, thermal shutdown protection, TTL-compatible enable control, and SOIC-8 package compatibility with standard PCB layout practices.
Technical Context
The LM2674M-5.0 implements a voltage-mode PWM controller 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 - but for the fixed 5.0V version, FB is internally tied to output, eliminating external resistors.
It features cycle-by-cycle current limiting (typ. 0.8A), thermal shutdown, and a low-power standby mode drawing 50μA when ON/OFF is pulled low. The high-side DMOS switch enables operation up to 40V input while maintaining stable 5.0V output across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% over line, load, and temperature - ensures stable rail for microcontrollers and analog circuitry without external feedback components. |
| Max Output Current | 500mA DC - sufficient to power multiple low-power ICs or sensor subsystems from a single regulator stage. |
| Input Voltage Range | 8V to 40V - supports wide-input industrial, automotive, and telecom power buses without pre-regulation. |
| Switching Frequency | 260kHz fixed - enables use of compact, off-the-shelf inductors (e.g., 47µH) and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω typical at 25°C - minimizes conduction loss and self-heating under full load, allowing copper traces as sole heatsink. |
| Quiescent Current | 3.6mA typical active, 50μA standby - balances efficiency during operation and ultra-low power consumption in sleep modes. |
| Protection Features | Thermal shutdown, current limit, and under-voltage lockout - provide autonomous fault recovery without external supervision circuitry. |
Pinout & Package
LM2674M-5.0 is supplied in an 8-pin SOIC (D package), 4.9mm × 6mm body size, 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 between CB and VSW to drive high-side DMOS gate - critical for proper switch turn-on and efficiency. |
| VIN (Pin 7) | Power input | Accepts 8–40V unregulated input; requires short, low-inductance path to CIN and GND for stability and EMI control. |
| GND (Pin 6) | Power ground | Primary return path for input/output capacitors and switch current; must be connected to system ground with minimal impedance. |
| VSW (Pin 8) | Switch node | Drives external inductor and catch diode cathode; high dv/dt node requiring tight layout and shielding to minimize radiated noise. |
| ON/OFF (Pin 5) | Enable control | TTL-compatible input; ≥1.4V enables regulation, ≤0.8V disables output and enters 50μA standby - supports system-level power sequencing. |
| FB (Pin 4) | Feedback sense | Internally connected to output for fixed 5.0V version - no external divider required; floating or miswiring causes regulation failure. |
| NC (Pins 2, 3) | No connect | Unbonded pins; must remain unconnected and unpopulated on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external resistor network, reducing BOM count and layout sensitivity while guaranteeing ±1.5% accuracy across operating conditions. |
| 260kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing - avoids subharmonic oscillation issues common in variable-frequency controllers. |
| Integrated 0.25Ω DMOS switch | Reduces external component count and conduction losses; supports full 500mA load without external MOSFET or driver circuitry. |
| TTL-compatible ON/OFF control | Allows direct interfacing with microcontroller GPIOs or logic-level sequencers without level-shifting, simplifying power management architecture. |
| Thermal shutdown + current limit | Autonomous protection against overload, short-circuit, or inadequate heatsinking - prevents device destruction during transient faults. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: Regulating 24V bus down to 5V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, stable 5V for digital logic and ADC references. Use Value: Delivers 500mA with <90% efficiency at 24V→5V conversion, minimizing heat buildup in enclosed enclosures without forced airflow. | Use Scenario: Powering ARM Cortex-M4 microcontrollers, CAN transceivers, and EEPROM in edge-node IoT gateways. IC Role / Device Role / Timing Role: System-level voltage regulator supplying core logic rail with fast transient response to processor activity bursts. Use Value: Fixed 5.0V output and 260kHz switching ensure low-noise operation compatible with sensitive analog peripherals and real-time communication timing. |
| Test Equipment Front-End | Legacy System Retrofit |
Use Scenario: Replacing aging linear regulators in bench multimeters and signal generators where input varies from 9–36V DC. IC Role / Device Role / Timing Role: High-efficiency preregulator feeding downstream LDOs, reducing thermal load on chassis-mounted heatsinks. Use Value: 8–40V input range accommodates battery-backed or adapter-derived supplies; 50μA standby current extends battery life in portable test gear. | Use Scenario: Upgrading 7805-based power sections in legacy industrial HMIs and motor drives with minimal board rework. IC Role / Device Role / Timing Role: Drop-in replacement for through-hole 7805 with improved efficiency, thermal performance, and built-in protection. Use Value: SOIC-8 footprint matches common 78xx socket adapters; eliminates need for large heatsinks while maintaining 5V/500mA capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574H-5.0 | Higher 40V max input, 52kHz switching frequency, larger external components required | Better suited for high-voltage, low-EMI applications where size is secondary to robustness | Select when input exceeds 36V or when lower switching frequency eases EMI filtering constraints |
| TPS54302DDCR | Synchronous 3A buck, 2.5–6V input, integrated high/low-side FETs, 2.5MHz switching | Designed for low-input, high-density applications - incompatible with >6V input or 500mA-only loads | Choose only for new designs with 3.3V/5V input rails and need for >1A output or ultra-small solution size |
Compared with LM2674M-5.0, LM2574H-5.0 trades higher input voltage tolerance and lower frequency for larger magnetics and reduced efficiency, while TPS54302DDCR offers synchronous efficiency and integration at the cost of strict input voltage limitation and no 40V capability.
Availability
LM2674M-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, test equipment front-ends, and legacy system retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2674M-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 reliable, high-performance power conversion ICs.
The LM2674 series was designed specifically for simple, robust, high-efficiency step-down regulation in cost-sensitive industrial and commercial systems - prioritizing ease of design, minimal external parts, and proven thermal reliability.
FAQ
What is the maximum input voltage rating for LM2674M-5.0?
The absolute maximum input voltage for LM2674M-5.0 is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe junction temperature or violating SOA limits, especially under full 500mA load. TI specifies 40V as the upper limit for guaranteed performance across temperature and lifetime.
Does LM2674M-5.0 require external feedback resistors?
No, LM2674M-5.0 does not require external feedback resistors. As a fixed-output variant, its internal feedback network is trimmed to regulate precisely to 5.0V. Pin 4 (FB) is internally connected to the output; connecting external resistors or loading this pin will disrupt regulation and may cause overvoltage or instability.
Can LM2674M-5.0 be used in synchronous rectification configurations?
No, LM2674M-5.0 is a non-synchronous buck regulator and cannot drive an external synchronous rectifier. It uses an internal DMOS switch and requires an external Schottky diode (e.g., IR30WQ05F) for freewheeling. Synchronous operation would require a dual-MOSFET controller like the TPS54302, which LM2674M-5.0 does not support.
What thermal considerations apply to LM2674M-5.0 in SOIC-8 package?
LM2674M-5.0 in SOIC-8 has RθJA = 105°C/W with 1 in² copper. At 500mA and 24V→5V conversion, power dissipation is ~9.5W × (1−5/24) ≈ 7.5W, resulting in ~790°C rise - exceeding safe limits. Real-world designs rely on PCB copper as heatsink: ≥2 in² of 2-oz copper with thermal vias reduces θJA to ~40°C/W, keeping junction temperature within 125°C at full load.
Is LM2674M-5.0 RoHS compliant and lead-free?
Yes, LM2674M-5.0 is RoHS compliant and lead-free. TI's official packaging information confirms Pb-free matte tin lead finish for the SOIC-8 (D) package, meeting JEDEC J-STD-020 moisture sensitivity level 3 and IPC/JEDEC J-STD-033 handling requirements for surface-mount assembly.
LM2674M-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
LM2674M-5.0 FAQ
1.How can I place an order for LM2674M-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674M-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 LM2674M-5.0 reliable?
The price and inventory of LM2674M-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 LM2674M-5.0 is usually 5 days.
3.What payment methods are accepted for LM2674M-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674M-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674M-5.0?
LM2674M-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674M-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 LM2674M-5.0?
For technical support, including LM2674M-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674M-5.0 requirements.
6.How does Aetrix verify that LM2674M-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2674M-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 LM2674M-5.0 meets industry standards.
7.What is the process for return or replacement of LM2674M-5.0?
All LM2674M-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2674M-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 LM2674M-5.0 part is unused and in its original packaging.
Return procedure for LM2674M-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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