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Texas Instruments LM2672MX-12
- Part No.:
- LM2672MX-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672MX-12.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,516
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Product details
Overview
LM2672MX-12 from Texas Instruments (formerly National Semiconductor) is a monolithic 1A step-down (buck) DC-DC switching regulator in SO-8 package, delivering fixed 12V output with ±1.5% tolerance over line and load, 260 kHz fixed-frequency operation, and 94% efficiency at 24V input/1A load. It serves as a high-efficiency primary or pre-regulator in industrial power supplies and embedded systems requiring stable 12V rail generation from wide-input sources.
For engineers reviewing the LM2672MX-12 datasheet, LM2672MX-12 pinout, LM2672MX-12 application, or LM2672MX-12 equivalent, key selection criteria include its 8V–40V input range, integrated 0.25Ω DMOS switch, TTL-compatible shutdown, soft-start capability, and thermal/current protection - all critical for robust, low-component-count buck converter designs.
Technical Context
The LM2672MX-12 implements a current-mode controlled buck topology with internal frequency compensation (Patents 5,382,918 and 5,514,947), enabling stable regulation without external loop compensation components. Its 260 kHz oscillator allows use of compact passive filters while maintaining >90% efficiency across its operating range.
It integrates a 0.25Ω DMOS power switch, feedback comparator referenced to 1.21V, soft-start circuit (0.63V threshold, 4.5 μA current), and synchronization input (pin 3) supporting external clocking up to 400 kHz - enabling noise-sensitive multi-rail systems to avoid beat frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1.5% over full line (15–40V), load (20 mA–1A), and temperature (−40°C to +125°C) - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Input Voltage Range | 8V to 40V - supports wide industrial input sources including 12V, 24V, and 36V nominal bus systems with margin for transients. |
| Switching Frequency | 260 kHz (±10%) - enables use of standard, low-cost 33–68 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 94% at VIN = 24V, IOUT = 1A - minimizes thermal stress and eliminates need for heatsinks beyond PCB copper traces. |
| Output Current | Guaranteed 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Quiescent Current | 2.5 mA typical (12V version) - balances low-noise operation with standby power consumption in always-on applications. |
| Standby Current | 50 μA typical with ON/OFF pin low - enables ultra-low-power sleep modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2672MX-12 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 area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 8–40V DC; requires local 22 μF tantalum bypass capacitor near pin to suppress input transients. |
| 2 (GND) | Power Ground | Main return path for switch, control circuitry, and feedback network; must be low-impedance connection to minimize noise coupling. |
| 3 (SYNC) | Frequency Synchronization Input | Accepts external 400 kHz clock signal (3.5V threshold); enables deterministic switching in multi-converter systems to avoid beat frequencies. |
| 4 (FB) | Feedback Input (N/C for fixed versions) | No-connect on LM2672MX-12; internally tied to 12V divider; unused pin must remain unconnected per datasheet. |
| 5 (SW) | Switch Node | Drives external catch diode and inductor; carries high dv/dt switching waveform - requires short, direct routing to minimize EMI and voltage spikes. |
| 6 (BOOST) | Bootstrap Capacitor Connection | Connects 0.01 μF ceramic capacitor between SW and BOOST to generate gate drive voltage for internal DMOS switch. |
| 7 (ON/OFF) | Enable/Shutdown Control | TTL-compatible input; <2.0V disables regulator (50 μA standby), >2.0V enables; supports system-level power sequencing. |
| 8 (VOUT) | Regulated Output | Delivers regulated 12V; requires 47–68 μF output capacitor (low-ESR tantalum) with ≤50 mΩ ESR for stability and ripple suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25Ω DMOS Switch | Reduces conduction losses and eliminates need for external MOSFET, simplifying layout and improving thermal performance. |
| Patented Internal Frequency Compensation | Enables stable operation with only 5 external components - no external compensation network required for standard designs. |
| Soft-Start Function | Controls output ramp-up via external capacitor (CSS) to limit inrush current and prevent input supply droop during startup. |
| Thermal Shutdown & Current Limit | Protects device under overload or ambient overheating; current limit set at 1.55A typical, preventing damage during short-circuit events. |
| 260 kHz Fixed-Frequency Operation | Provides predictable EMI profile and enables consistent filter design using off-the-shelf inductors and capacitors. |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Generating clean 12V rail from vehicle battery (9–16V) or higher-voltage auxiliary bus (24V) to power MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12V output with high efficiency and transient response. Use Value: 94% efficiency at 24V/1A reduces heat buildup in sealed enclosures; TTL shutdown enables coordinated power-down with vehicle ignition state. | Use Scenario: Powering microcontroller, EEPROM, and discrete drivers in HVAC, lighting, or door module subassemblies. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator replacing linear regulators to improve thermal management and extend battery life. Use Value: Wide 8–40V input accommodates cold-crank (6.5V min) and load-dump (40V max) conditions; ±1.5% output tolerance ensures reliable digital logic operation. |
| Programmable Logic Controller (PLC) I/O Module | Test & Measurement Equipment Power Stage |
Use Scenario: Providing isolated 12V bias for analog front-end op-amps, ADC references, and isolation barrier drivers in modular PLC backplanes. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-noise LDOs or directly powering noise-tolerant loads. Use Value: 260 kHz switching allows small 33–47 μH inductors; soft-start prevents brownout during hot-swap insertion of I/O modules. | Use Scenario: Generating stable 12V rail from lab bench supply or internal 24V/48V bus for precision DACs, FPGA configuration, and analog signal chains. IC Role / Device Role / Timing Role: Primary DC-DC converter with synchronization capability for multi-channel synchronized power domains. Use Value: SYNC pin enables phase alignment with other converters to reduce input ripple and simplify EMI filtering in dense instrument layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672M-12 | Same SO-8 package and electrical specs, but shipped in anti-static rails instead of tape-and-reel; identical pinout and thermal characteristics. | Suitable for low-volume prototyping or manual assembly where reel packaging is unnecessary. | Select LM2672MX-12 for automated SMT production; choose LM2672M-12 for hand-soldered evaluation or small-batch builds. |
| LM2596SX-12 | 3A rated, 150 kHz switching, wider input (4.5–40V), but requires external compensation and lacks SYNC/soft-start features. | Better suited for higher-current or cost-sensitive applications where design flexibility outweighs integration benefits. | Choose LM2672MX-12 when board space, component count, and ease of design are priorities; LM2596SX-12 when >1A output or lower BOM cost is required. |
Compared with LM2672M-12, the LM2672MX-12 offers identical performance in tape-and-reel format for SMT lines; versus LM2596SX-12, it trades current headroom for superior integration, smaller passives, and built-in protection - making it optimal for compact, production-ready 1A designs.
Availability
LM2672MX-12 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, programmable logic controller I/O modules, and test & measurement equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2672MX-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 acquired National Semiconductor in 2011 and maintains legacy SIMPLE SWITCHER® product lines with full datasheet, simulation model, and application support.
The LM2672 series was designed specifically for cost-sensitive, high-efficiency 1A buck conversion in industrial and automotive environments - emphasizing minimal external components, robust fault protection, and ease of layout.
FAQ
What is the maximum input voltage rating for the LM2672MX-12?
The absolute maximum input voltage for the LM2672MX-12 is 45V, but the recommended operating range is 8V to 40V. Exceeding 40V risks violating the guaranteed specifications and may trigger overvoltage stress on internal circuitry. The 40V upper limit ensures reliable operation under worst-case transients such as automotive load dump, and aligns with the 12V output version's validated performance data in the datasheet.
Does the LM2672MX-12 require an external feedback resistor network?
No, the LM2672MX-12 does not require an external feedback resistor network. As a fixed-output variant, its feedback node (pin 4) is internally connected to the 12V divider. The datasheet explicitly states FB is "N/C" (no connect) for fixed versions, and connecting external resistors will disrupt regulation. This internal configuration eliminates tuning complexity and improves accuracy versus adjustable counterparts.
Can the LM2672MX-12 be synchronized to an external clock source?
Yes, the LM2672MX-12 supports external synchronization via its SYNC pin (pin 3). Applying a square-wave signal with ≥3.5V threshold and up to 400 kHz enables precise timing alignment with other converters. This feature is documented in the Electrical Characteristics table and Typical Performance section, allowing noise-sensitive applications to eliminate beat frequencies and simplify EMI filtering - a capability absent in many competing 1A buck regulators.
What thermal considerations apply to the LM2672MX-12 in SO-8 package?
The LM2672MX-12 in SO-8 has a junction-to-ambient thermal resistance (θJA) of 105°C/W with ~1 in² of copper on the PCB. At 1A load and 24V input, dissipation is ~0.6W; this yields ~63°C rise above ambient - well within the +125°C max junction limit. No heatsink is needed if adequate copper pour and thermal vias are used, as confirmed by National Semiconductor's thermal modeling in AN-1187 and LM267X Made Simple v6.0.
Is the LM2672MX-12 RoHS-compliant and lead-free?
Yes, the LM2672MX-12 is RoHS-compliant and lead-free. Texas Instruments' official product change notice (PCN) for the LM2672 family confirms Pb-free SO-8 packaging with NiPdAu lead finish, compliant with JEDEC J-STD-020 moisture sensitivity level 3. The device meets EU RoHS Directive 2011/65/EU and is marked with TI's standard RoHS logo and date code per packaging specification.
LM2672MX-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:
- 1A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2672MX-12 FAQ
1.How can I place an order for LM2672MX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672MX-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 LM2672MX-12 reliable?
The price and inventory of LM2672MX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2672MX-12 is usually 5 days.
3.What payment methods are accepted for LM2672MX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672MX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672MX-12?
LM2672MX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672MX-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 LM2672MX-12?
For technical support, including LM2672MX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672MX-12 requirements.
6.How does Aetrix verify that LM2672MX-12 is sourced from the original manufacturer or authorized distributors?
All LM2672MX-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 LM2672MX-12 meets industry standards.
7.What is the process for return or replacement of LM2672MX-12?
All LM2672MX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2672MX-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 LM2672MX-12 part is unused and in its original packaging.
Return procedure for LM2672MX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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