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Texas Instruments LM2675N-12
- Part No.:
- LM2675N-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2675N-12.pdf
- Description:
- IC REG BUCK 12V 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,536
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Product details
Overview
LM2675N-12 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering 1A output current with fixed 12V output, ±1.5% output voltage tolerance, 260kHz fixed-frequency operation, and up to 94% efficiency at 24V input. 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 LM2675N-12 datasheet, LM2675N-12 pinout, LM2675N-12 application, or LM2675N-12 equivalent, key selection criteria include its 8V–40V input range, thermal shutdown protection, TTL-compatible ON/OFF control, and minimal external component count (5 total) enabling rapid implementation of stable 12V supply rails.
Technical Context
The LM2675N-12 implements a synchronous-free buck topology using an integrated high-side DMOS FET switch with 0.3Ω typical RDS(ON), driven by a fixed 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 directly to VOUT, eliminating external resistors.
Operation includes active mode (ON/OFF ≥ 1.4V), low-power shutdown mode (ISTBY ≤ 100μA), cycle-by-cycle current limiting (1.25–2.1A), and thermal shutdown. Frequency foldback activates under extreme overload to reduce switching frequency below 100kHz, preventing device damage during sustained short-circuit conditions.
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. |
| Input Voltage Range | 8V to 40V - supports wide-input industrial supplies, battery-backed systems, and automotive-derived inputs. |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, or small FPGA I/O banks. |
| Switching Frequency | 260kHz fixed - enables use of compact 22–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | Up to 94% at VIN=24V, IOUT=1A - minimizes heat generation; PCB copper traces serve as sole heatsink. |
| Quiescent Current | 3.6mA typical in active mode; 100μA max in shutdown - supports low-power standby states. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and frequency foldback - provide robust fault recovery without external circuitry. |
Pinout & Package
LM2675N-12 is supplied in an 8-pin PDIP (P) package (9.81mm × 9.43mm), with exposed pad grounded for thermal performance. 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 above VIN. |
| 2 NC | No connect | Not internally bonded; must remain unconnected and unrouted on PCB. |
| 3 NC | No connect | Not internally bonded; must remain unconnected and unrouted on PCB. |
| 4 FB | Feedback sense input | Internally tied to output for fixed-12V version; no external divider required. |
| 5 ON/OFF | Enable control input | TTL-compatible; ≥1.4V enables regulation, ≤0.8V disables with ≤100μA standby current. |
| 6 GND | Power ground | Main return path for input/output capacitors and inductor; shortest possible trace to minimize noise. |
| 7 VIN | Input supply | Accepts 8–40V DC; requires local 22μF tantalum bypass capacitor placed adjacent to pin. |
| 8 VSW | Switch node | Drives external inductor and Schottky catch diode; high dv/dt node requiring tight layout. |
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 | Enables stable operation with only 5 external components-no loop compensation design required. |
| Fixed 12V output configuration | Removes feedback resistor network, improving accuracy and reducing board space versus adjustable variants. |
| TTL shutdown with low standby current | Supports system-level power sequencing and energy-efficient sleep modes in battery-powered devices. |
| WEBENCH® Power Designer integration | Generates complete schematics, bill-of-materials, thermal simulations, and CAD exports directly from TI's online tool. |
Applications
| Industrial PLC I/O Module | Embedded Sensor Hub |
|---|---|
Use Scenario: Providing isolated 12V rail for analog sensor signal conditioning and digital I/O drivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary DC-DC buck converter generating clean, regulated 12V from 24V field bus supply. Use Value: Delivers 1A with <1.5% output variation across temperature and load, ensuring ADC reference stability and relay coil consistency. | Use Scenario: Powering multi-sensor nodes (temperature, humidity, pressure) with integrated MCU and wireless transceiver in edge IoT gateways. IC Role / Device Role / Timing Role: Main 12V supply for analog front-end and level-shifting circuitry interfacing with 3.3V digital core. Use Value: High 94% efficiency minimizes self-heating in sealed enclosures; shutdown mode cuts system idle power to <100μA. |
| Test Equipment Power Supply | Legacy Industrial Controller |
Use Scenario: Generating stable 12V for precision op-amps, DACs, and calibration references in benchtop multimeters and signal sources. IC Role / Device Role / Timing Role: Low-noise, tightly regulated intermediate rail derived from higher-voltage lab supply. Use Value: ±1.5% output tolerance and excellent line regulation (<0.1%/V) ensure measurement repeatability across input fluctuations. | Use Scenario: Replacing aging linear regulators in legacy motor drives and HMI panels where 12V powers display backlighting and optocouplers. IC Role / Device Role / Timing Role: Drop-in upgrade from inefficient 7812-based solutions to improve thermal margin and reliability. Use Value: 8–40V input range accommodates degraded or fluctuating 24VDC field supplies without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675M-12 | Same electrical specs; SOIC-8 package (4.9mm × 6mm) instead of PDIP-8 - smaller footprint, better thermal resistance (RθJA = 105°C/W vs 95°C/W). | Preferred for space-constrained PCBs; requires rework of solder mask and stencil but identical schematic. | Select when board area is limited and surface-mount assembly is available. |
| LM2575H-12 | Higher 63V absolute max input, 52kHz switching frequency, 3A output capability - larger magnetics, lower efficiency (~88%), wider VOUT tolerance (±4%). | Suitable for high-input-voltage or higher-current legacy designs; not pin-compatible; requires full redesign. | Choose only if >40V input or >1A load is required - otherwise LM2675N-12 offers superior efficiency and size. |
Compared with LM2675M-12, the LM2675N-12 trades board space for easier hand-soldering and prototyping; versus LM2575H-12, it delivers tighter regulation, higher efficiency, and faster transient response at the cost of lower max input voltage and output current.
Availability
LM2675N-12 is available at Aetrix Electronics and suitable for industrial PLCs, embedded sensor hubs, test equipment power supplies, and legacy controller upgrades requiring stable component supply and long-term manufacturability.
Supply support for LM2675N-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® portfolio, designed specifically for engineers needing fast, reliable, and low-component-count DC-DC buck solutions for industrial, automotive, and communications infrastructure.
FAQ
What is the maximum input voltage rating for LM2675N-12?
The LM2675N-12 has an absolute maximum input voltage rating of 45V, with recommended operating range from 8V to 40V. Exceeding 40V continuously risks exceeding thermal limits or triggering protection circuits; operation above 45V may cause permanent damage per TI SNVS129G Absolute Maximum Ratings table.
Does LM2675N-12 require external feedback resistors?
No. The LM2675N-12 is the fixed 12V output variant; its FB pin is internally connected to the output stage, eliminating the need for external resistor dividers. This simplifies layout, improves regulation accuracy, and removes resistor tolerance errors that affect adjustable versions.
Can LM2675N-12 be used in discontinuous conduction mode (DCM)?
Yes. The LM2675N-12 operates in both continuous and discontinuous conduction modes depending on load, inductance, and input voltage. At light loads (<300mA with typical 47μH inductor), it naturally transitions to DCM, reducing switching losses and improving light-load efficiency - verified in Figure 5-16 of the LM2675N-12 datasheet.
What thermal considerations apply to LM2675N-12 in PDIP package?
The LM2675N-12 in PDIP (P) package has a junction-to-ambient thermal resistance (RθJA) of 95°C/W on a standard 4-layer JEDEC board. To maintain TJ < 125°C at 1A load, keep ambient temperature below 60°C or add copper pour and thermal vias under the GND and DAP pads - per TI AN-1187 guidelines for leadless packages (not applicable here, but grounding best practices still apply).
Is LM2675N-12 RoHS compliant and halogen-free?
Yes. LM2675N-12 is manufactured in compliance with RoHS Directive 2011/65/EU and TI's corporate halogen-free policy. Full material declarations and compliance documentation are available via TI's Quality & Environmental Information portal using the LM2675N-12 part number.
LM2675N-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2675N-12 FAQ
1.How can I place an order for LM2675N-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675N-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 LM2675N-12 reliable?
The price and inventory of LM2675N-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675N-12 is usually 5 days.
3.What payment methods are accepted for LM2675N-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675N-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675N-12?
LM2675N-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675N-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 LM2675N-12?
For technical support, including LM2675N-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675N-12 requirements.
6.How does Aetrix verify that LM2675N-12 is sourced from the original manufacturer or authorized distributors?
All LM2675N-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 LM2675N-12 meets industry standards.
7.What is the process for return or replacement of LM2675N-12?
All LM2675N-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2675N-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 LM2675N-12 part is unused and in its original packaging.
Return procedure for LM2675N-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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