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Texas Instruments LM2674MX-12
- Part No.:
- LM2674MX-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674MX-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
LM2674MX-12 from Texas Instruments is a monolithic 500 mA step-down (buck) DC/DC voltage regulator with fixed 12 V output, 260 kHz fixed-frequency switching, ±1.5% output voltage tolerance over line and load, 0.25 Ω DMOS output switch on-resistance, and wide 8 V to 40 V input range. It delivers high efficiency (>94% at 24 VIN/500 mA) and integrates internal frequency compensation for stable operation with minimal external components.
For engineers reviewing the LM2674MX-12 datasheet, LM2674MX-12 pinout, LM2674MX-12 application, or LM2674MX-12 equivalent, key selection considerations include its SO-8 package compatibility, TTL-compatible shutdown capability (50 μA standby current), thermal shutdown and current limit protection, and suitability for industrial power rails requiring regulated 12 V at up to 500 mA.
Technical Context
The LM2674MX-12 implements a synchronous-buck topology using an integrated DMOS power switch and fixed-frequency PWM controller operating at 260 kHz (±10%). Its internal oscillator eliminates need for external timing components, and patented internal frequency compensation ensures stability without external loop compensation networks.
It features a dedicated ON/OFF pin with 1.4 V typical turn-on threshold, 20 μA typical sourcing current, and supports low-power standby mode. The feedback path uses a precision 1.21 V reference (for adjustable variants), but the LM2674MX-12 bypasses this via internal resistor divider to deliver fixed 12 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V, ±1.5% tolerance across 15–40 V input and 20 mA–500 mA load ensures stable rail for logic, analog, and peripheral supplies. |
| Max Output Current | 500 mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs without external boost stages. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact, low-cost inductors (e.g., 47–100 μH) and reduces EMI compared to lower-frequency alternatives. |
| Input Voltage Range | 8 V to 40 V - supports wide-input industrial, automotive, and telecom power buses including 12 V, 24 V, and 36 V nominal systems. |
| Efficiency | 94% typical at VIN = 24 V, IOUT = 500 mA - minimizes thermal stress; PCB copper traces serve as sole heatsink under normal operation. |
| Shutdown Current | 50 μA typical - enables ultra-low-power system-level sleep modes without external enable circuitry. |
| On-Resistance | 0.25 Ω (typical) DMOS switch - limits conduction loss to <125 mW at 500 mA, supporting high-efficiency conversion without external MOSFETs. |
Pinout & Package
LM2674MX-12 is supplied in an 8-pin SOIC (SO-8) surface-mount package per NSC MO8A/N08E drawing, with standard 1.27 mm pitch and gull-wing leads. Thermal resistance θJA is 105°C/W with ~1 in² copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 8–40 V DC; requires local 22 μF tantalum bypass capacitor near pin to suppress transients. |
| GND | Power ground reference | Common return for input/output capacitors, inductor, and catch diode; must be low-impedance plane. |
| SW | Switch node | Drives external catch diode and inductor; high dv/dt node requiring short, direct routing to minimize EMI. |
| FB | Feedback input | Internally connected to 12 V divider; not user-accessible - no external resistors required for fixed-output operation. |
| ON/OFF | Enable/shutdown control | TTL-compatible; pulled up internally to 7 V; drives low (<0.8 V) to enter 50 μA standby mode. |
| BOOST | Bootstrap capacitor terminal | Connects 0.01 μF ceramic capacitor between SW and BOOST to drive high-side switch gate fully. |
| NC | No connect | Pin 7 is unused and must remain unconnected per datasheet; no internal connection or function. |
| NC | No connect | Pin 8 is unused and must remain unconnected per datasheet; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated frequency compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Thermal shutdown + current limit | Protects device during overload, short-circuit, or high-temperature conditions without external sensing circuitry. |
| Fixed-frequency PWM control | Enables predictable EMI filtering and simplifies input/output capacitor selection versus variable-frequency regulators. |
| Low quiescent current in shutdown | 50 μA standby current allows battery-backed or energy-sensitive systems to maintain long sleep duration. |
| Wide input voltage range | 8–40 V operation supports direct connection to unregulated industrial or vehicle battery rails without pre-regulation. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Generating stable 12 V rail from 24 V truck battery for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 12 V at up to 500 mA with high efficiency and thermal resilience. Use Value: Eliminates need for discrete MOSFET + controller solution; 94% efficiency reduces board heating in sealed enclosures. | Use Scenario: Powering microcontroller, CAN transceiver, and LED drivers in door module with 12 V battery input. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator providing clean, protected 12 V supply with enable control synchronized to vehicle ignition state. Use Value: TTL-compatible ON/OFF pin enables direct MCU GPIO control; 50 μA shutdown current preserves battery during vehicle off-state. |
| Test Equipment Power Rail | Point-of-Load Converter for Legacy Systems |
Use Scenario: Providing isolated 12 V bias for op-amps and ADC references in portable calibration instruments. IC Role / Device Role / Timing Role: Compact, low-noise step-down regulator with minimal external parts (5 total) for space-constrained PCBs. Use Value: SO-8 footprint and internal compensation reduce layout complexity and validation effort versus controller-based designs. | Use Scenario: Replacing aging linear regulators (e.g., 7812) in legacy industrial controllers needing higher efficiency and lower thermal load. IC Role / Device Role / Timing Role: Drop-in-capable buck replacement offering same 12 V output but with >90% efficiency vs. ~40% for linear solutions. Use Value: Enables retrofit without PCB redesign - shares same pinout as many legacy TO-220 regulators when used with adapter layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574MX-12 | Lower 52 kHz switching frequency; larger inductor/capacitor requirements; 400 mA max output; no internal compensation (requires external RC network). | Suitable for cost-sensitive, low-EMI designs where board space is less constrained and efficiency >90% is not mandatory. | Select LM2574MX-12 only if legacy design reuse or lower-frequency EMI compliance is prioritized over size and efficiency. |
| TPS5430DDAR | Higher 500 kHz switching; 3 A output; external compensation; wider 5.5–36 V input; requires more external components and layout care. | Better suited for high-current, space-optimized designs requiring dynamic load response and programmable soft-start. | Choose TPS5430DDAR when scaling beyond 500 mA or requiring tighter transient response - not a drop-in replacement for LM2674MX-12. |
Compared with LM2574MX-12, the LM2674MX-12 offers higher efficiency and smaller magnetics due to 260 kHz operation and integrated compensation; versus TPS5430DDAR, it trades higher current capability for simpler implementation and lower BOM count in 500 mA applications.
Availability
LM2674MX-12 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2674MX-12 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 ICs, with broad manufacturing scale and automotive-grade qualification capabilities.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers seeking robust, easy-to-implement DC/DC buck converters with minimal external components and proven reliability in harsh environments.
FAQ
What is the maximum input voltage rating for LM2674MX-12?
The absolute maximum input voltage for LM2674MX-12 is 45 V, but the recommended operating range is 8 V to 40 V DC. Exceeding 40 V may compromise long-term reliability or trigger overvoltage protection mechanisms not explicitly documented. Always maintain input transients below 45 V, and use appropriate clamping or filtering upstream of the LM2674MX-12.
Does LM2674MX-12 require external feedback resistors?
No - LM2674MX-12 is a fixed-output variant with internal resistor divider set to 12 V. The FB pin is not accessible for adjustment and must remain unconnected per the datasheet. External resistors are only required for the adjustable LM2674MX-ADJ version.
Can LM2674MX-12 be used with ceramic output capacitors?
Yes, but with caution: the LM2674MX-12 datasheet recommends tantalum or low-ESR aluminum electrolytic capacitors for stable operation. Ceramic capacitors alone may cause ringing or instability due to their near-zero ESR; if used, add a small series resistor (e.g., 20–50 mΩ) or combine with a bulk electrolytic capacitor to ensure adequate phase margin.
What is the thermal performance of LM2674MX-12 in SO-8 package?
The SO-8 (M) package has a junction-to-ambient thermal resistance (θJA) of 105°C/W with ~1 in² copper pad. At 500 mA output and 94% efficiency, power dissipation is ~360 mW, resulting in ~38°C rise above ambient - well within the −40°C to +125°C operating junction temperature range without forced air or heatsinking.
Is LM2674MX-12 pin-compatible with other LM2674 fixed-output variants?
Yes - all LM2674 fixed-output versions (e.g., LM2674MX-3.3, LM2674MX-5.0, LM2674MX-12) share identical SO-8 pinout, package dimensions, and electrical interface. Only the internal feedback divider differs; thus, they are mechanically and electrically interchangeable on the same PCB layout.
LM2674MX-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2674MX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674MX-12 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-12 reliable?
The price and inventory of LM2674MX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674MX-12 is usually 5 days.
3.What payment methods are accepted for LM2674MX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674MX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674MX-12?
LM2674MX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674MX-12 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-12?
For technical support, including LM2674MX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674MX-12 requirements.
6.How does Aetrix verify that LM2674MX-12 is sourced from the original manufacturer or authorized distributors?
All LM2674MX-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2674MX-12?
All LM2674MX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2674MX-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2674MX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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