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Texas Instruments LM2674MX-3.3
- Part No.:
- LM2674MX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674MX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,024
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Product details
Overview
LM2674MX-3.3 from Texas Instruments is a monolithic 500 mA step-down (buck) DC/DC switching regulator in SO-8 package, featuring fixed 3.3 V output, 260 kHz fixed-frequency operation, ±1.5% output voltage tolerance over line/load/temperature, and integrated 0.25 Ω DMOS power switch. It delivers >90% efficiency in typical applications such as industrial power rails and embedded system pre-regulation.
For engineers reviewing the LM2674MX-3.3 datasheet, LM2674MX-3.3 pinout, LM2674MX-3.3 application, or LM2674MX-3.3 equivalent, key selection considerations include input voltage range (6.5–40 V), standby current (50 μA), thermal shutdown protection, and compatibility with standard off-the-shelf inductors and Schottky catch diodes.
Technical Context
The LM2674MX-3.3 implements a current-mode buck topology with internal frequency compensation (U.S. Pat. Nos. 5,382,918 and 5,514,947), enabling stable regulation using only five external components. Its 260 kHz oscillator allows compact filter design while maintaining low EMI compared to lower-frequency alternatives.
It integrates a high-side DMOS switch with 0.25 Ω RDS(ON), TTL-compatible ON/OFF control with 1.4 V turn-on threshold, and full fault protection including cycle-by-cycle current limiting and thermal shutdown. The feedback pin references a precise 1.21 V internal bandgap, though this applies only to adjustable versions-not the fixed 3.3 V LM2674MX-3.3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over full operating temperature (−40°C to +125°C), line (6.5–40 V), and load (20–500 mA) ranges. |
| Max Output Current | Guaranteed 500 mA continuous DC load current with proper PCB copper area for thermal dissipation. |
| Switching Frequency | 260 kHz fixed internal oscillator (±10%), enabling use of smaller inductors and capacitors vs. 50–150 kHz regulators. |
| Input Voltage Range | 6.5 V to 40 V DC - supports wide industrial input sources including 12 V, 24 V, and unregulated AC/DC supplies. |
| Efficiency | 86% typical at VIN = 12 V, IOUT = 500 mA - reduces thermal load and eliminates need for heatsinks on PCB traces. |
| Standby Current | 50 μA typical when ON/OFF pin pulled low - enables low-power sleep modes in battery-backed systems. |
| On-Resistance | 0.25 Ω typical DMOS switch RDS(ON) - minimizes conduction loss and improves light-load efficiency. |
Pinout & Package
LM2674MX-3.3 is housed in an 8-pin SOIC (SO-8) surface-mount package per NSC drawing MO8A/N08E, with exposed pad not electrically connected. Thermal resistance θJA = 105°C/W with ~1 in² copper pour.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power Input | Primary DC input supply (6.5–40 V); requires local 22 μF tantalum bypass capacitor. |
| 2 (GND) | Power Ground | Common return for input/output capacitors, inductor, and catch diode; must connect to low-impedance ground plane. |
| 3 (SW) | Switch Node | Drain of internal DMOS switch; connects to inductor and cathode of catch diode - high dv/dt node requiring short layout. |
| 4 (FB) | Feedback Input | Not used in fixed-output LM2674MX-3.3; internally tied to output; leave unconnected or float. |
| 5 (ON/OFF) | Enable Control | TTL-compatible shutdown pin; <1.4 V disables regulator (50 μA standby); >2.0 V enables; internal 7 V pull-up allows floating for always-on. |
| 6 (GND) | Power Ground | Second ground pin for improved thermal and noise performance; must be tied to same ground as Pin 2. |
| 7 (BOOST) | Bootstrap Supply | Connects to SW and 0.01 μF ceramic capacitor to enable full gate drive of internal DMOS switch. |
| 8 (VOUT) | Regulated Output | Fixed 3.3 V output; requires 47–100 μF low-ESR tantalum or ceramic output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Patented internal frequency compensation | Eliminates need for external compensation network - simplifies design and ensures stability across all operating conditions. |
| Integrated 0.25 Ω DMOS power switch | Reduces external component count and conduction losses; enables 500 mA output without external MOSFET. |
| 260 kHz fixed-frequency operation | Enables use of standard, low-cost, off-the-shelf inductors (e.g., 47–68 μH) and avoids audible noise in sensitive applications. |
| TTL-compatible ON/OFF control | Supports microcontroller-driven power sequencing with <50 μA shutdown current - ideal for portable and energy-aware systems. |
| Full protection suite | Includes cycle-by-cycle current limiting, thermal shutdown, and safe-start behavior - prevents damage during overload or short-circuit events. |
Applications
| Industrial Power Rail | Embedded System Pre-Regulator |
|---|---|
|
Use Scenario: Providing clean 3.3 V rail for PLC I/O modules powered from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3 V to microcontrollers, ADCs, and digital isolators. Use Value: High efficiency (>90%) minimizes heat buildup in sealed enclosures; wide 6.5–40 V input accommodates brownout and surge conditions. |
Use Scenario: Generating 3.3 V intermediate supply for LDO post-regulation in FPGA-based edge computing nodes. IC Role / Device Role / Timing Role: High-current pre-regulator stepping down 12 V system rail before low-noise linear regulation. Use Value: 500 mA capability supports multi-rail FPGA core/logic banks; 260 kHz switching avoids interference with high-speed SerDes clocks. |
| Point-of-Load Converter | Positive-to-Negative Inverter |
|
Use Scenario: Local 3.3 V generation near noise-sensitive analog front-ends in medical sensor signal chains. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator placed adjacent to ADC/DAC ICs to minimize IR drop and EMI coupling. Use Value: SO-8 package enables dense placement; fixed 3.3 V output eliminates resistor divider errors and improves long-term accuracy. |
Use Scenario: Generating −3.3 V bias supply for op-amp level-shifting circuits using inverting buck-boost topology. IC Role / Device Role / Timing Role: Core switching element in inverting configuration (SW → inductor → diode → GND → cap → VOUT−). Use Value: Internal 0.25 Ω switch and 260 kHz frequency support efficient inverting operation with minimal external parts count. |
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 rating; identical 3.3 V fixed output, SO-8 package, and 260 kHz frequency. | Better suited for designs requiring >500 mA or higher transient margin; shares same PCB footprint and external component values. | Select LM2675M-3.3 if future load growth or peak current demands exceed 500 mA. |
| TPS54302DDCR | 3 A output, 2.5–6 V input, 500 kHz switching, integrated soft-start; different pinout and control architecture (current-mode PWM). | Requires redesign of feedback, compensation, and layout; offers higher efficiency at light loads and better transient response. | Choose TPS54302DDCR only when upgrading to higher current or needing tighter output regulation (<±1%) and programmable features. |
Compared with LM2674MX-3.3, LM2675M-3.3 provides headroom for increased load without layout change, while TPS54302DDCR enables higher performance at the cost of full redesign - making LM2674MX-3.3 optimal for cost-sensitive, volume-stable 500 mA applications.
Availability
LM2674MX-3.3 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LM2674MX-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 decades of expertise in high-reliability power conversion ICs.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers seeking robust, easy-to-use, high-efficiency DC/DC buck regulators with minimal external components and proven reliability in harsh environments.
FAQ
What is the maximum input voltage rating for LM2674MX-3.3?
The absolute maximum input voltage for LM2674MX-3.3 is 45 V, but the recommended operating range is 6.5 V to 40 V DC. Exceeding 40 V may degrade long-term reliability or trigger overvoltage stress on internal circuitry, even if thermal limits are maintained. Always observe derating guidelines in TI's SNVS007E datasheet.
Does LM2674MX-3.3 require an external feedback resistor network?
No - LM2674MX-3.3 is a fixed-output variant with internal feedback divider; the FB pin is not functional and must remain unconnected. Only adjustable versions (e.g., LM2674MX-ADJ) require external R1/R2 resistors. Using resistors with LM2674MX-3.3 will not alter output voltage and may introduce noise or instability.
Can LM2674MX-3.3 be used in discontinuous conduction mode (DCM)?
Yes - LM2674MX-3.3 operates in both continuous (CCM) and discontinuous (DCM) conduction modes depending on load, input voltage, and inductor value. DCM occurs naturally below ~100–150 mA at typical settings and is fully supported; efficiency drops slightly, but regulation remains stable and no design changes are needed.
What thermal management is required for LM2674MX-3.3 at 500 mA?
At 500 mA and 12 V input, LM2674MX-3.3 dissipates ~0.5 W. With its SO-8 θJA = 105°C/W, junction temperature rise is ~53°C above ambient - well within the +125°C max. Use ≥1 in² copper pour on the GND pins and ensure Pins 2 & 6 are soldered to solid ground planes to maintain safe operation without heatsinks.
Is LM2674MX-3.3 RoHS compliant and lead-free?
Yes - LM2674MX-3.3 is manufactured in TI's RoHS-compliant, lead-free SO-8 package (Pb-free terminal finish, NiPdAu plating). It meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard lead-free reflow profiles (peak 260°C).
LM2674MX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
LM2674MX-3.3 FAQ
1.How can I place an order for LM2674MX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674MX-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 LM2674MX-3.3 reliable?
The price and inventory of LM2674MX-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 LM2674MX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2674MX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674MX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674MX-3.3?
LM2674MX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674MX-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 LM2674MX-3.3?
For technical support, including LM2674MX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674MX-3.3 requirements.
6.How does Aetrix verify that LM2674MX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2674MX-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 LM2674MX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2674MX-3.3?
All LM2674MX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2674MX-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 LM2674MX-3.3 part is unused and in its original packaging.
Return procedure for LM2674MX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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