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Texas Instruments LM2674M-3.3
- Part No.:
- LM2674M-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674M-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
LM2674M-3.3 from Texas Instruments is a monolithic 500 mA step-down (buck) DC/DC voltage regulator in SO-8 package, featuring fixed 3.3 V output, 260 kHz fixed-frequency switching, ±1.5% output voltage tolerance over line/load/temperature, and integrated 0.25 Ω DMOS power switch. It delivers high efficiency (>90%) in industrial power supplies requiring compact, low-external-component solutions.
For engineers reviewing the LM2674M-3.3 datasheet, LM2674M-3.3 pinout, LM2674M-3.3 application, or LM2674M-3.3 equivalent, key selection considerations include input voltage range (6.5–40 V), thermal shutdown protection, TTL-compatible shutdown pin (50 μA standby current), and compatibility with standard off-the-shelf inductors and Schottky catch diodes.
Technical Context
The LM2674M-3.3 implements a synchronous-free buck topology with internal frequency compensation (U.S. Pat. Nos. 5,382,918 and 5,514,947), eliminating need for external compensation components. Its 260 kHz oscillator enables use of smaller passive filters than lower-frequency regulators while maintaining stable operation across 6.5–40 V input and −40°C to +125°C junction temperature.
Control architecture integrates current-limit protection (0.62–1.25 A), thermal shutdown, and a dedicated ON/OFF pin with 0.8–2.0 V turn-on threshold. The feedback loop references an internal 1.21 V bandgap, but since this is a fixed-output variant, the FB pin is internally connected - no external resistor divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over full line/load/temperature range - ensures stable logic supply for microcontrollers and FPGAs without trimming. |
| Max Output Current | 500 mA continuous - supports mid-power embedded systems such as industrial I/O modules and sensor interfaces. |
| Input Voltage Range | 6.5 V to 40 V - accommodates wide-input industrial rails (e.g., 12 V, 24 V, 36 V nominal) with margin for transients. |
| Switching Frequency | 260 kHz (±10%) - balances EMI control and inductor/capacitor size; enables use of 47–100 μH standard inductors. |
| Efficiency | 86% at VIN = 12 V, IOUT = 500 mA - reduces thermal load; PCB copper traces suffice as heatsink under typical conditions. |
| Quiescent Current | 2.5–3.6 mA operating; 50–150 μA in shutdown - enables low-power standby modes in battery-backed systems. |
| On-Resistance | 0.25 Ω (typ), 0.40–0.60 Ω (max) - minimizes conduction loss and improves light-load efficiency vs. higher-RDS(on) alternatives. |
Pinout & Package
LM2674M-3.3 is housed in an 8-pin SOIC (SO-8) surface-mount package per NSC MO8A/N08E drawing, with exposed pad not electrically connected. Thermal resistance θJA = 105°C/W with ~1 in² copper area.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 6.5–40 V DC; requires local 22 μF tantalum bypass capacitor near pin. |
| 2 (GND) | Power Ground | Common return for input/output paths and IC substrate; must connect to low-impedance ground plane. |
| 3 (SW) | Switch Node | Drives external catch diode and inductor; high dv/dt node requiring short trace routing. |
| 4 (FB) | Feedback Input | Internally tied to 3.3 V reference; no external connection needed for fixed-output operation. |
| 5 (ON/OFF) | Enable/Shutdown Control | TTL-compatible input; <0.8 V disables regulator (50 μA standby); >2.0 V enables; floating = enabled. |
| 6 (BOOST) | Bootstrap Capacitor Terminal | Connects to 0.01 μF ceramic capacitor between SW and BOOST to drive internal high-side switch gate. |
| 7 (GND) | Power Ground (Second) | Dual GND pins reduce ground bounce; both must be soldered and tied to same ground plane. |
| 8 (VOUT) | Regulated Output | Delivers 3.3 V ±1.5%; requires 47–100 μF output capacitor with low ESR (e.g., 47 μF/10 V tantalum). |
Key Features
| Feature | Design Value |
|---|---|
| Patented internal frequency compensation | Eliminates external compensation network - simplifies layout and improves stability across all operating conditions. |
| Integrated 0.25 Ω DMOS power switch | Reduces conduction losses and eliminates need for external MOSFET - lowers BOM count and board space. |
| 260 kHz fixed-frequency oscillator | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter in noise-sensitive applications. |
| TTL-compatible ON/OFF pin | Supports system-level power sequencing and low-power sleep modes with minimal external logic. |
| Thermal shutdown + current limit | Provides autonomous fault recovery during overload or poor heatsinking - prevents damage without external circuitry. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor front-ends in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3.3 V point-of-load regulator converting 24 V rail to logic supply for microcontroller, ADCs, and level-shifters. Use Value: High efficiency (>90%) minimizes heat buildup in sealed enclosures; wide input range tolerates 24 V vehicle battery fluctuations (18–32 V). | Use Scenario: Supplying 3.3 V to CAN transceivers, EEPROM, and low-power MCU peripherals in door module ECUs. IC Role / Device Role / Timing Role: Secondary buck regulator downstream of main 5 V supply, delivering clean, regulated 3.3 V with fast transient response. Use Value: 500 mA capability supports multiple peripherals simultaneously; shutdown pin enables wake-on-CAN functionality with <150 μA quiescent draw. |
| Medical Patient Monitor Interface | Networking Edge Device |
Use Scenario: Providing isolated 3.3 V power to touch-screen controller, USB PHY, and data acquisition ASIC in portable diagnostic equipment. IC Role / Device Role / Timing Role: Compact, low-noise DC/DC converter replacing linear regulators to meet thermal and efficiency requirements in fanless designs. Use Value: Fixed 3.3 V output eliminates resistor tolerance errors; ±1.5% accuracy ensures reliable ADC reference and digital interface timing margins. | Use Scenario: Generating 3.3 V for Ethernet PHY, PoE interface ICs, and FPGA configuration memory in industrial switches. IC Role / Device Role / Timing Role: Robust intermediate regulator handling 36 V PoE+ input surges while powering sensitive communication silicon. Use Value: 40 V absolute max input rating and thermal shutdown protect against sustained overvoltage events common in PoE infrastructure. |
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 | Higher 1 A output current; identical 260 kHz frequency and SO-8 package; improved efficiency (up to 92% at 12 V→3.3 V/1 A). | Required where load exceeds 500 mA or future-proofing for higher-current derivatives is needed. | Select LM2675M-3.3 if design headroom or scalability beyond 500 mA is critical; pinout and footprint are identical. |
| TPS54331DR | 3 A output, 570 kHz switching, adjustable output; requires external feedback resistors; smaller 8-pin SO-PowerPAD package. | Suitable for higher-current or dynamically adjustable rails; demands more layout attention due to higher frequency and thermal pad. | Choose TPS54331DR only when >500 mA is required or when programmability justifies added complexity and cost. |
Compared with LM2674M-3.3, LM2675M-3.3 offers direct pin-compatible upgrade path for higher current, while TPS54331DR provides greater flexibility at the cost of design complexity and non-drop-in replacement - making LM2674M-3.3 optimal for cost-sensitive, fixed 500 mA applications where simplicity and proven reliability are prioritized.
Availability
LM2674M-3.3 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 guaranteed parametric compliance.
Supply support for LM2674M-3.3 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 broad portfolio serving industrial, automotive, and communications markets.
The LM2674 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in cost-sensitive, medium-power DC/DC applications where minimal external components and robust protection features are essential.
FAQ
What is the maximum input voltage rating for LM2674M-3.3?
The absolute maximum input voltage for LM2674M-3.3 is 45 V, but the recommended operating range is 6.5 V to 40 V. Exceeding 40 V continuously risks violating safe operating area limits, especially under high ambient temperature or heavy load. Always observe derating curves in the datasheet for sustained operation above 36 V.
Does LM2674M-3.3 require an external feedback resistor network?
No, LM2674M-3.3 does not require external feedback resistors. As a fixed-output variant, its feedback pin (FB) is internally connected to the 3.3 V regulation node. External resistors are only needed for the adjustable version (LM2674M-ADJ); adding them to LM2674M-3.3 would disrupt regulation and is not supported.
Can LM2674M-3.3 be used with ceramic output capacitors?
Yes, LM2674M-3.3 can be used with ceramic output capacitors, but caution is advised: low-ESR ceramics may cause ringing or instability without proper damping. TI recommends using ≥100 μF with 5–20 mΩ ESR, or adding a small series resistor (e.g., 22–47 mΩ) if ceramic-only solution is required. Tantalum remains the preferred choice per datasheet guidelines.
What is the thermal performance of LM2674M-3.3 in SO-8 package?
LM2674M-3.3 in SO-8 package has a junction-to-ambient thermal resistance (θJA) of 105°C/W with ~1 in² copper area. At 500 mA output and 12 V input, typical power dissipation is ~1.2 W, resulting in ~126°C junction rise above ambient - well within the +125°C max TJ rating only if ambient stays below ~−1°C. Adequate copper pour or airflow is essential for full-load operation.
Is LM2674M-3.3 RoHS compliant and lead-free?
Yes, LM2674M-3.3 is RoHS compliant and lead-free, manufactured per TI's standard green packaging process. The SO-8 package uses matte tin (Sn) lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements. Full compliance documentation is available in TI's Quality & Environmental section.
LM2674M-3.3 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):
- 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 FAQ
1.How can I place an order for LM2674M-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674M-3.3 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 reliable?
The price and inventory of LM2674M-3.3 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 is usually 5 days.
3.What payment methods are accepted for LM2674M-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674M-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674M-3.3?
LM2674M-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674M-3.3 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?
For technical support, including LM2674M-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674M-3.3 requirements.
6.How does Aetrix verify that LM2674M-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2674M-3.3 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 meets industry standards.
7.What is the process for return or replacement of LM2674M-3.3?
All LM2674M-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2674M-3.3, 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 part is unused and in its original packaging.
Return procedure for LM2674M-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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