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Texas Instruments LM2675MX-12/NOPB
- Part No.:
- LM2675MX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2675MX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,467
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Product details
Overview
LM2675MX-12/NOPB 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 compact, high-efficiency power conversion in industrial and embedded systems.
For engineers reviewing the LM2675MX-12/NOPB datasheet, LM2675MX-12/NOPB pinout, LM2675MX-12/NOPB application, or LM2675MX-12/NOPB equivalent, key selection considerations include its 8-pin SOIC package, 8V–40V input range, TTL-compatible enable control, thermal shutdown protection, and minimal external component count (5 total).
Technical Context
The LM2675MX-12/NOPB implements a synchronous-free buck topology using 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-though for the fixed-12V variant, FB is shorted to VOUT, bypassing external resistor dividers.
It operates in continuous conduction mode up to 1A load, features cycle-by-cycle current limiting (1.25–2.1A), thermal shutdown, and TTL-compatible ON/OFF control with 50μA standby current. The device requires no external compensation due to patented internal frequency compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1.5% over line/load/temperature - ensures stable rail for logic, analog, or interface ICs without trimming. |
| Max Output Current | 1A continuous - supports single-rail microcontrollers, sensors, or communication modules without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates unregulated 12V/24V industrial supplies, automotive battery variations, and legacy AC-DC outputs. |
| Switching Frequency | 260kHz fixed - enables use of small, low-ESR 47–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 94% typical at 24VIN/1A - minimizes thermal rise; PCB copper traces suffice as heat sink per datasheet guidance. |
| Quiescent Current | 3.6mA active, 50μA standby - supports low-power wake-on-event designs when paired with microcontroller-controlled ON/OFF pin. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or ambient temperature excursions. |
Pinout & Package
LM2675MX-12/NOPB is supplied in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed pad not present (non-WSON variant). 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 drive high-side FET gate; critical for proper switch turn-on. |
| 2 NC | No connect | Unbonded pin; must remain floating-no routing or soldering required. |
| 3 NC | No connect | Unbonded pin; must remain floating-no routing or soldering required. |
| 4 FB | Feedback sense input | Internally tied to output for fixed-12V version; leave unconnected or short to VOUT per datasheet Figure 7-1. |
| 5 ON/OFF | Enable control input | TTL-compatible; ≥1.4V = active regulation, ≤0.8V = shutdown with 50μA IQ; pull-up resistor recommended if microcontroller-driven. |
| 6 GND | Power ground | Main return path for input/output capacitors and inductor; requires low-impedance, short PCB trace to minimize noise and thermal resistance. |
| 7 VIN | Input supply | Accepts 8–40V DC; connect high-frequency bypass capacitor (22μF tantalum) directly between VIN and GND with minimal loop area. |
| 8 VSW | Switch node output | Drives external inductor and Schottky catch diode; high dv/dt node requiring tight layout, guard ring, and minimized trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity. |
| Patented internal frequency compensation | Removes requirement for external compensation network-only 5 components needed for full design. |
| Fixed 260kHz oscillator | Enables predictable EMI filtering and consistent inductor sizing across production units without tuning. |
| TTL-compatible ON/OFF control | Allows direct interfacing with 3.3V/5V logic without level-shifting; supports system-level power sequencing and sleep modes. |
| Thermal shutdown + current limit | Provides autonomous fault recovery under overload, short-circuit, or elevated ambient conditions-no external monitoring needed. |
Applications
| Industrial PLC Power Rail | Embedded Sensor Node Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 12V to analog front-end circuitry, isolated I/O drivers, and CAN transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck converter generating main 12V system rail from 24V field bus. Use Value: Delivers 1A at 94% efficiency with minimal thermal footprint-enabling convection-cooled enclosures and eliminating heatsinks. |
Use Scenario: Powering multi-sensor nodes (temperature, humidity, pressure) with MCU, RF module, and signal conditioning in remote monitoring systems. IC Role / Device Role / Timing Role: Central DC-DC regulator converting wide-input 12–36V solar/battery sources to stable 12V for analog subsystems. Use Value: Wide 8–40V input range accommodates variable battery states; 50μA shutdown current extends battery life in sleep intervals. |
| Test Equipment Auxiliary Supply | Legacy Instrumentation Retrofit |
|
Use Scenario: Generating isolated 12V bias for op-amps, ADC references, and precision DACs in portable calibration tools and benchtop analyzers. IC Role / Device Role / Timing Role: High-stability preregulator feeding linear regulators to achieve ultra-low-noise analog rails. Use Value: ±1.5% output tolerance and excellent line/load regulation ensure reference accuracy across varying input and load conditions. |
Use Scenario: Replacing aging discrete or linear regulators in legacy medical or lab equipment requiring reliable 12V at ~1A. IC Role / Device Role / Timing Role: Drop-in upgrade path for obsolete 7812-based supplies-maintains same footprint and output voltage. Use Value: 94% efficiency reduces board heating vs. linear regulators, extending service life of thermally constrained chassis. |
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; no internal compensation. | Better suited for higher-current, lower-frequency designs where EMI filtering is less critical and board space is available. | Select when >1A load or cost-sensitive high-volume production outweighs efficiency and size advantages. |
| TPS54160DGQR | Adjustable output (0.8–28V), 1.5A, 2.5–60V input, 100–2500kHz adjustable frequency, integrated soft-start. | Offers greater flexibility for multi-rail systems but requires external feedback resistors and compensation. | Choose when design requires programmable output or wider input range beyond 40V, accepting added design complexity. |
Compared with LM2675MX-12/NOPB, LM2575H-12 trades efficiency and size for raw current capability and simplicity, while TPS54160DGQR adds configurability at the cost of external component count and design effort-making LM2675MX-12/NOPB optimal for fixed 12V, 1A, space-constrained industrial applications.
Availability
LM2675MX-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded sensor networks, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2675MX-12/NOPB 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/NOPB?
The absolute maximum input voltage for LM2675MX-12/NOPB is 45V, but the recommended operating range is 8V to 40V per datasheet Section 5.3. Exceeding 40V risks violating safe operating area limits and may trigger overvoltage stress on internal DMOS switch and gate oxide-TI specifies 40V as the upper bound for guaranteed reliability and lifetime performance.
Does LM2675MX-12/NOPB require external compensation components?
No, LM2675MX-12/NOPB does not require external compensation components. It incorporates patented internal frequency compensation, enabling stable operation with only five external parts: input capacitor, output capacitor, inductor, bootstrap capacitor, and Schottky catch diode-as confirmed in Section 1 Features and Section 6.3.1 of the SNVS129G datasheet.
Can LM2675MX-12/NOPB be used in discontinuous conduction mode (DCM)?
Yes, LM2675MX-12/NOPB operates in both continuous and discontinuous conduction modes depending on load and inductor value. At light loads (<300mA with typical 47–68μH inductors), it naturally transitions to DCM-verified in Figure 5-16 of the datasheet, which shows measured waveforms under 300mA load with 15μH inductor.
What is the thermal resistance (RθJA) of LM2675MX-12/NOPB in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for LM2675MX-12/NOPB in 8-pin SOIC (D package) is 105°C/W, measured on a standard 4-layer JEDEC board with ~1 in² copper around leads (Section 5.4). Actual thermal performance improves with additional PCB copper area and thermal vias-TI notes that increased copper further lowers RθJA.
Is LM2675MX-12/NOPB pin-compatible with other LM2675 variants like LM2675-5.0?
Yes, LM2675MX-12/NOPB is pin-compatible with all fixed-output LM2675 variants (e.g., LM2675-3.3, LM2675-5.0) in the same SOIC-8 package. Pin configuration, function mapping, and PCB footprint are identical-only the internal feedback network differs, making them drop-in replacements for different output voltages.
LM2675MX-12/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2675MX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675MX-12/NOPB 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/NOPB reliable?
The price and inventory of LM2675MX-12/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675MX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675MX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675MX-12/NOPB?
LM2675MX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675MX-12/NOPB 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/NOPB?
For technical support, including LM2675MX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675MX-12/NOPB requirements.
6.How does Aetrix verify that LM2675MX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675MX-12/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675MX-12/NOPB?
All LM2675MX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675MX-12/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM2675MX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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