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Texas Instruments LM2672M-12
- Part No.:
- LM2672M-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672M-12.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,757
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Product details
Overview
LM2672M-12 from Texas Instruments is a monolithic 1-A step-down (buck) DC-DC switching regulator with fixed 12-V output, 260-kHz internal oscillator, ±1.5% output voltage tolerance over line and load, 8 V to 40 V input range, and integrated DMOS power MOSFET. It delivers high-efficiency power conversion in industrial power supplies and embedded systems requiring stable mid-range voltage rails.
For engineers reviewing the LM2672M-12 datasheet, LM2672M-12 pinout, LM2672M-12 application, or LM2672M-12 equivalent, key selection considerations include its fixed 12-V output, thermal shutdown and current limit protection, TTL-compatible ON/OFF control, soft-start capability, and compatibility with standard external components including Schottky diodes and low-ESR output capacitors.
Technical Context
The LM2672M-12 implements a fixed-frequency PWM controller with an internal 260-kHz oscillator driving a high-side DMOS power switch. Its feedback loop uses direct connection of the FB pin to the output for regulation-no external resistors required-enabling stable 12-V output across –40°C to 125°C junction temperature.
It integrates soft-start via an external capacitor on the SS pin, frequency synchronization via the SYNC pin (accepting external clocks >275 kHz), and shutdown control through the ON/OFF pin with 50-μA standby current. Protection includes cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and under-voltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±1.5% over line, load, and temperature - ensures stable rail for logic, analog, and interface ICs without trimming. |
| Input Voltage Range | 8 V to 40 V - supports wide-input industrial, automotive, and telecom power buses with margin for transients. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact, low-cost inductors and reduces EMI compared to lower-frequency buck converters. |
| Max Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and peripheral ICs in embedded systems. |
| Efficiency | 94% at VIN = 24 V, IOUT = 1 A - minimizes heat generation and eliminates need for heatsinks beyond PCB copper. |
| Quiescent Current | 3.6 mA typical - maintains low no-load power draw in always-on subsystems. |
| Standby Current | 50 μA typical when ON/OFF = 0 V - enables ultra-low-power sleep modes in battery-backed or energy-sensitive designs. |
Pinout & Package
LM2672M-12 is available in 8-pin SOIC (D package), with body size 5.00 mm × 6.20 mm. Pin functions are validated per TI SNVS136L datasheet Rev L (June 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CB | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to VSW to gate-drive high-side MOSFET fully ON, minimizing RDS(on) losses. |
| 2 SS | Soft-start timing input | External capacitor sets output voltage ramp time; floating disables soft-start. |
| 3 SYNC | Frequency synchronization input | Accepts external TTL/CMOS clock >275 kHz to align switching noise; open-circuit defaults to 260 kHz. |
| 4 FB | Feedback sense input | Internally tied to 12-V reference; connect directly to output for regulation-no external divider needed. |
| 5 ON/OFF | Enable/disable control | TTL-compatible input: ≥1.4 V enables, ≤0.8 V disables; internal 20-μA pull-up allows floating for always-on operation. |
| 6 GND | Power ground | Primary return path for input capacitor, output capacitor, and internal switch; must be short, low-inductance trace. |
| 7 VIN | Main supply input | Accepts 8–40 V; connects to high-frequency bypass capacitor (CIN) with minimal loop area to reduce EMI. |
| 8 VSW | Switch node output | Drives external inductor and Schottky catch diode; high dv/dt node requiring careful layout and grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Enables single-chip 1-A buck solution with <0.3 Ω RDS(on), eliminating external high-side FET and driver complexity. |
| Patented internal frequency compensation | Removes need for external compensation network-reduces BOM count and design iteration time. |
| TTL shutdown with 50-μA standby | Allows system-level power sequencing and low-power sleep states without external enable circuitry. |
| Soft-start with external capacitor control | Prevents inrush current and output overshoot during startup; adjustable ramp time avoids stress on input source and output caps. |
| Thermal shutdown + current limit protection | Provides fault resilience against overload, short-circuit, and ambient overheating-no external sensing or protection IC required. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
Use Scenario: Converting 24-V factory bus to regulated 12-V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, stable 12-V rail with fast transient response to varying load steps. Use Value: 94% efficiency at 24-V input reduces thermal load on DIN-rail enclosures; integrated protection eliminates need for external current-sense or thermal monitoring. |
Use Scenario: Generating 12-V bias for analog front-ends, op-amps, and ADC references in portable test equipment. IC Role / Device Role / Timing Role: Mid-voltage rail generator with soft-start and shutdown control synchronized to MCU wake-up signals. Use Value: 50-μA standby current extends battery life in sleep mode; 260-kHz switching enables small 68-μH inductor and compact layout. |
| Automotive Subsystem Power | Telecom Line Card Bias |
Use Scenario: Deriving 12-V from 28-V vehicle battery for infotainment display backlight drivers and CAN transceivers. IC Role / Device Role / Timing Role: Robust intermediate regulator handling cold-crank (6.5 V) and load-dump (40 V) conditions per ISO 16750. Use Value: 8–40 V input range covers full automotive transient envelope; ±1.5% output tolerance ensures reliable operation of sensitive analog ICs. |
Use Scenario: Providing isolated 12-V bias for Ethernet PHYs and line interface circuits in central office equipment. IC Role / Device Role / Timing Role: Fixed-output buck stage feeding downstream LDOs or isolated DC-DC modules. Use Value: SYNC pin enables clock alignment with system master oscillator to avoid beat frequencies in sensitive RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672N-12 | Same electrical specs but in 8-pin PDIP package (10.16 mm × 6.60 mm); higher thermal resistance (95°C/W vs. 105°C/W for SOIC). | Preferred for prototyping or through-hole assembly; less suitable for high-density or thermally constrained PCBs. | Select LM2672N-12 only when manual soldering or breadboarding is required; SOIC version offers better thermal performance and smaller footprint. |
| LM2576-12 | Lower switching frequency (52 kHz), higher quiescent current (5.5 mA), no SYNC or soft-start; requires larger inductor and output cap. | Better suited for cost-sensitive, low-EMI applications where size and efficiency are secondary to BOM simplicity. | Choose LM2576-12 if board space and thermal budget allow larger magnetics and ripple filtering; LM2672M-12 offers superior efficiency and integration. |
Compared with LM2672N-12 and LM2576-12, the LM2672M-12 provides the best balance of compact SOIC packaging, 260-kHz switching for small passives, and integrated features like soft-start and frequency sync-making it optimal for production-grade industrial and embedded designs where thermal management and layout density matter.
Availability
LM2672M-12 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, and automotive subsystem power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2672M-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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2672 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust operation in industrial, automotive, and communications power applications.
FAQ
What is the maximum input voltage rating for the LM2672M-12?
The LM2672M-12 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 8 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection or cause permanent damage. The 40-V upper limit ensures reliable performance under automotive load-dump and industrial surge conditions while maintaining specified efficiency and regulation.
Does the LM2672M-12 require external feedback resistors to set its output voltage?
No, the LM2672M-12 does not require external feedback resistors. As a fixed-output variant, it internally references the 12-V output and connects the FB pin directly to the output capacitor for regulation. This eliminates resistor tolerance errors and simplifies layout-only the standard external components (inductor, Schottky diode, input/output capacitors, and bootstrap capacitor) are needed to complete the design.
Can the LM2672M-12 synchronize to an external clock signal?
Yes, the LM2672M-12 supports external clock synchronization via its SYNC pin. An external TTL- or CMOS-compatible clock signal greater than 275 kHz can be AC-coupled to the SYNC pin to force the internal oscillator to lock to that frequency. This feature enables precise EMI spectrum positioning and noise cancellation in multi-regulator systems-critical in telecom and RF-sensitive applications.
What is the typical efficiency of the LM2672M-12 at full load?
The LM2672M-12 achieves 94% typical efficiency at VIN = 24 V and IOUT = 1 A, as specified in Section 7.7 of the SNVS136L datasheet. This high efficiency results from low RDS(on) of the integrated DMOS switch, optimized gate drive, and 260-kHz switching that balances conduction and switching losses-allowing PCB copper traces alone to serve as thermal dissipation paths.
How does the ON/OFF pin function on the LM2672M-12?
The ON/OFF pin on the LM2672M-12 provides TTL-compatible enable control: pulling it below 0.8 V disables the regulator with 50-μA standby current, while applying ≥1.4 V enables normal operation. An internal 20-μA pull-up allows the pin to be left floating for always-on behavior. This pin supports system-level power sequencing and low-power sleep modes without external logic or level-shifting circuitry.
LM2672M-12 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):
- 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
LM2672M-12 FAQ
1.How can I place an order for LM2672M-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672M-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 LM2672M-12 reliable?
The price and inventory of LM2672M-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2672M-12 is usually 5 days.
3.What payment methods are accepted for LM2672M-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672M-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672M-12?
LM2672M-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672M-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 LM2672M-12?
For technical support, including LM2672M-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672M-12 requirements.
6.How does Aetrix verify that LM2672M-12 is sourced from the original manufacturer or authorized distributors?
All LM2672M-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 LM2672M-12 meets industry standards.
7.What is the process for return or replacement of LM2672M-12?
All LM2672M-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2672M-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 LM2672M-12 part is unused and in its original packaging.
Return procedure for LM2672M-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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