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Texas Instruments LM2675MX-12
- Part No.:
- LM2675MX-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2675MX-12.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,133
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Product details
Overview
LM2675MX-12 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering 1A output current with fixed 12V output, ±1.5% output voltage tolerance, 260kHz fixed-frequency operation, and 94% peak efficiency at 24VIN/1A. It integrates a DMOS power MOSFET switch and internal frequency compensation for high-efficiency power conversion in industrial and embedded power supplies.
For engineers reviewing the LM2675MX-12 datasheet, LM2675MX-12 pinout, LM2675MX-12 application, or LM2675MX-12 equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints, and confirmed alternative options - all grounded in TI's production-grade SNVS129G specification.
Technical Context
The LM2675MX-12 implements a synchronous-free buck topology with an integrated high-side DMOS FET switch and internal 260kHz oscillator. Its feedback loop regulates output by comparing FB pin voltage to a precise 1.21V internal reference, enabling stable 12V regulation across 15–40V input range and –40°C to 125°C junction temperature.
It features TTL-compatible ON/OFF control with 1.4V threshold, thermal shutdown, cycle-by-cycle current limiting (1.25–2.1A), and 50μA standby quiescent current. The device requires only five external components - input capacitor, output capacitor, catch diode, inductor, and bootstrap capacitor - and relies on PCB copper for thermal dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1.5% over line/load/temperature - ensures stable rail for microcontrollers and analog circuitry without external resistor divider. |
| Output Current | 1A continuous - supports mid-power subsystems such as sensor interfaces, communication modules, and FPGA I/O banks. |
| Input Voltage Range | 15V to 40V - compatible with 24V industrial bus, automotive battery systems (with transient protection), and telecom intermediate rails. |
| Switching Frequency | 260kHz ±10% - enables use of compact 22–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 94% typical at VIN=24V, IOUT=1A - minimizes thermal load and eliminates need for heatsinks beyond PCB copper area. |
| Quiescent Current | 3.6mA active, 50μA standby - supports low-power wake-on-event architectures when paired with external enable logic. |
| Thermal Protection | Integrated thermal shutdown - prevents latch-up during overload or poor layout; auto-recovery upon cooling. |
Pinout & Package
LM2675MX-12 is supplied in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed thermal pad not present (unlike WSON variants). Pin functions are validated per TI SNVS129G Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CB | Bootstrap capacitor connection | Connects 470nF ceramic capacitor between CB and VSW to bias high-side gate driver - critical for proper switch turn-on. |
| 2 NC | No connect | Internally unconnected; must remain floating - no routing or grounding allowed. |
| 3 NC | No connect | Internally unconnected; must remain floating - no routing or grounding allowed. |
| 4 FB | Feedback sense input | Internally tied to 12V output for fixed version - leave unconnected (not grounded) to avoid overvoltage failure. |
| 5 ON/OFF | Enable control input | TTL-compatible; ≥1.4V enables regulation, ≤0.8V disables with 50μA standby - supports microcontroller GPIO control. |
| 6 GND | Power ground | Main return path for input/output capacitors and inductor - requires short, low-inductance trace to minimize noise and instability. |
| 7 VIN | Input supply | Accepts 15–40V DC; connects to high-frequency input capacitor (e.g., 22μF tantalum) with minimal loop area to GND. |
| 8 VSW | Switch node output | Drives external Schottky diode and inductor - high dv/dt node requiring tight layout, guard ring, and no adjacent signal traces. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and calibration drift risk. |
| 260kHz fixed-frequency oscillator | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter seen in hysteretic regulators. |
| Internal frequency compensation | Removes need for external compensation network - simplifies design and improves stability across capacitor ESR variations. |
| TTL shutdown with 50μA standby | Allows system-level power sequencing and ultra-low-power sleep modes without external level-shifting circuitry. |
| Thermal + current limit protection | Self-protecting under overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure in unattended systems. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers and analog sensor front-ends in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary 12V buck regulator supplying downstream LDOs and interface ICs - operates continuously with 100% duty cycle capability at minimum input. Use Value: 94% efficiency minimizes heat buildup inside sealed enclosures; ±1.5% tolerance ensures reliable ADC reference and logic-level compatibility. |
Use Scenario: Generating stable 12V rail for microcontroller peripherals, CAN transceivers, and LED drivers in vehicle body electronics. IC Role / Device Role / Timing Role: Pre-regulator stepping down noisy 12V battery-derived input (up to 40V during load dump) before linear post-regulation. Use Value: Wide 15–40V input range accommodates automotive transients; thermal shutdown prevents field failures during connector hot-plug events. |
| Point-of-Load Telecom Supply | Embedded Network Appliance |
|
Use Scenario: Local 12V conversion for Ethernet PHYs, SFP+ modules, and management controllers in access switches and routers. IC Role / Device Role / Timing Role: Secondary buck stage fed from 48V intermediate bus - delivers clean, low-noise 12V with fast transient response. Use Value: 260kHz switching enables small 33–47μH shielded inductors; 1A rating supports burst-mode PHY loads without voltage droop. |
Use Scenario: Powering ARM-based SoC I/O domains, USB hubs, and display controllers in fanless edge computing devices. IC Role / Device Role / Timing Role: Main system regulator converting 19–24V adapter input to 12V for downstream DC-DC stages and peripherals. Use Value: SOIC package allows manual rework and automated assembly; 5 external components reduce layout footprint and test complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575H-12 | 52kHz switching frequency, 3A output, larger external components required | Better suited for higher-current, lower-EMI designs where board space is less constrained | Select when >1A load or lower EMI is prioritized over efficiency and component count |
| TPS54202DRT | 2.5–6V input, 2A output, integrated high/low-side FETs, 500kHz operation | Requires different input voltage range and offers higher integration but no 12V fixed option | Select for 5V-input systems needing higher current density; not drop-in for 24V input or 12V fixed output |
Compared with LM2675MX-12, LM2575H-12 trades higher current and lower EMI for reduced efficiency (≈85%) and larger magnetics, while TPS54202DRT offers superior integration and efficiency but lacks native 12V fixed output and wide-input capability - making LM2675MX-12 optimal for cost-sensitive, 24V-fed 12V point-of-load applications requiring minimal external parts.
Availability
LM2675MX-12 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, telecom point-of-load supplies, and embedded network appliances requiring stable component supply, long-lifecycle support, and proven reliability in harsh environments.
Supply support for LM2675MX-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 LM2675 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and robust performance in industrial, automotive, and communications power supplies.
FAQ
What is the maximum input voltage rating for LM2675MX-12?
The absolute maximum input voltage for LM2675MX-12 is 45V, but the recommended operating range is 15V to 40V per TI SNVS129G. Operation above 40V risks exceeding internal FET breakdown limits and invalidates thermal derating curves. For 24V nominal systems, this provides ample margin against load-dump transients common in automotive and industrial settings. Always verify input capacitor voltage rating and transient clamping in final design.
Can LM2675MX-12 be used with an adjustable output configuration?
No - LM2675MX-12 is a fixed-output variant with internal feedback network set to 12V. Unlike the LM2675-ADJ, it does not expose the FB pin for external resistor programming. Attempting to modify feedback will disrupt regulation and may cause overvoltage. For adjustable output, select LM2675M-ADJ or LM2675N-ADJ with appropriate SOIC or WSON packaging.
What external components are mandatory for LM2675MX-12 operation?
Five components are mandatory: (1) input capacitor (≥22μF, 50V tantalum or low-ESR ceramic), (2) output capacitor (≥47μF, 25V tantalum), (3) Schottky catch diode (≥3A, ≥50V), (4) power inductor (33–68μH, rated ≥1.5A), and (5) bootstrap capacitor (470nF, 50V ceramic). Omitting or undersizing any compromises regulation, efficiency, or reliability - especially the CB capacitor, which directly enables high-side FET drive.
Does LM2675MX-12 require a heatsink?
No discrete heatsink is required. At 94% efficiency and 1A load, power dissipation remains below 0.7W - adequately managed by the SOIC package's 105°C/W junction-to-ambient thermal resistance and standard 1-inch² PCB copper pour. Thermal shutdown activates only under sustained overload or inadequate board copper; TI recommends minimum 200mm² exposed copper connected to GND pins for optimal performance.
How does the ON/OFF pin function in LM2675MX-12?
The ON/OFF pin is a TTL-compatible enable input: logic-high (≥1.4V) activates regulation, logic-low (≤0.8V) forces shutdown with 50μA standby current. It is not inverted - no external pull-up is needed if driven by a microcontroller GPIO. Floating the pin defaults to enabled. This pin supports precise system power sequencing and low-power sleep states without auxiliary circuitry, and its 20μA typical input current minimizes control-source loading.
LM2675MX-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
LM2675MX-12 FAQ
1.How can I place an order for LM2675MX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675MX-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 LM2675MX-12 reliable?
The price and inventory of LM2675MX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675MX-12 is usually 5 days.
3.What payment methods are accepted for LM2675MX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675MX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675MX-12?
LM2675MX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675MX-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 LM2675MX-12?
For technical support, including LM2675MX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675MX-12 requirements.
6.How does Aetrix verify that LM2675MX-12 is sourced from the original manufacturer or authorized distributors?
All LM2675MX-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 LM2675MX-12 meets industry standards.
7.What is the process for return or replacement of LM2675MX-12?
All LM2675MX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2675MX-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 LM2675MX-12 part is unused and in its original packaging.
Return procedure for LM2675MX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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