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Texas Instruments LM2675N-12/NOPB
- Part No.:
- LM2675N-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2675N-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:384
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Product details
Overview
LM2675N-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 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/NOPB datasheet, LM2675N-12/NOPB pinout, LM2675N-12/NOPB application, or LM2675N-12/NOPB equivalent, key selection criteria include its 8-pin PDIP package, 6.5–40V input range, thermal shutdown protection, TTL-compatible ON/OFF control, and minimal external component count (5 total).
Technical Context
The LM2675N-12/NOPB implements a synchronous-free buck topology using an integrated high-side DMOS FET switch with 0.3Ω typical RDS(ON), driven by a 260kHz internal 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.
It operates in continuous conduction mode up to 1A load, features cycle-by-cycle current limiting (1.25–2.1A), thermal shutdown, and enters low-power standby (<100μA) when ON/OFF pin voltage drops below 1.4V. 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 analog circuitry or logic without trimming. |
| Input Voltage Range | 6.5V to 40V - supports wide-input industrial supplies, battery-backed systems, and automotive nominal 12V/24V rails. |
| Max Output Current | 1A continuous - sufficient to power microcontrollers, sensors, and peripheral ICs without external boost stages. |
| Switching Frequency | 260kHz fixed - enables use of small, low-ESR ceramic capacitors and compact 22–68μH inductors; avoids audible noise. |
| Efficiency | 94% at VIN=24V, IOUT=1A - minimizes thermal load; PCB copper traces serve as sole heatsink under typical conditions. |
| Quiescent Current | 3.6mA active, 100μA standby - enables low-power sleep modes in battery-operated equipment. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and undervoltage lockout - prevents damage during overload, short-circuit, or brownout. |
Pinout & Package
LM2675N-12/NOPB uses the 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 |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 470nF capacitor to VSW to gate-drive the internal high-side DMOS FET; critical for proper switch turn-on. |
| NC (Pins 2,3) | No-connect | Internally unconnected; must remain floating or grounded per layout best practice-no routing or loading. |
| FB (Pin 4) | Feedback sense input | Internally tied to output for fixed-12V version; not used externally-shorting to VOUT closes regulation loop. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible digital input; ≥1.4V enables regulation, <0.8V disables output and reduces IQ to ≤100μA. |
| VIN (Pin 7) | Main power input | Accepts 6.5–40V DC; requires local 22μF tantalum bypass capacitor with short, low-inductance path to GND. |
| VSW (Pin 8) | Switch node output | Drives external catch diode and inductor; high dv/dt node requiring tight layout and ground plane shielding. |
| GND (Pin 6) | Power ground | Main return path for VIN, CIN, COUT, and VSW loop; must connect to system ground with minimal impedance. |
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-frequency 260kHz oscillator | Ensures predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
| TTL-compatible enable input | Allows direct interfacing with microcontroller GPIOs without level-shifting or pull-up resistors. |
| Thermal shutdown + current limit | Provides autonomous fault recovery-device resumes regulation after cooling or load reduction. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: Converting 24V factory bus to regulated 12V for PLC I/O modules and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC buck regulator providing clean, efficient 12V rail with fast transient response to varying load steps. Use Value: Delivers 94% efficiency at full 1A load, minimizing heat buildup in enclosed enclosures without forced air cooling. | Use Scenario: Powering ARM Cortex-M7 microcontrollers and associated peripherals (ADCs, DACs, CAN transceivers) in edge gateway devices. IC Role / Device Role / Timing Role: Main system voltage regulator supplying stable 12V to LDOs that generate core and I/O voltages. Use Value: Fixed 12V output eliminates feedback resistor selection errors; ±1.5% tolerance ensures downstream LDOs operate within spec. |
| Automotive Body Control | Test Equipment Power |
Use Scenario: Generating 12V from vehicle battery (9–16V nominal, up to 40V load dump) for interior lighting controllers and window motor drivers. IC Role / Device Role / Timing Role: Robust primary regulator handling wide input transients while maintaining output regulation during cranking. Use Value: 40V absolute max input rating and thermal shutdown protect against load-dump spikes and sustained overloads. | Use Scenario: Providing calibrated 12V output in portable benchtop instruments requiring low-noise, repeatable supply rails. IC Role / Device Role / Timing Role: Precision fixed-output converter where stability and repeatability outweigh programmability needs. Use Value: ±1.5% output tolerance over temperature and load ensures measurement accuracy without recalibration. |
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, higher RDS(ON) (0.4Ω), lower efficiency (~85%), larger magnetics required. | Better suited for cost-sensitive, low-EMI designs where size and thermal performance are secondary. | Select when legacy compatibility or lower EMI is prioritized over efficiency and footprint. |
| TPS54202D | 2MHz switching, integrated high/low-side FETs, adjustable output, smaller 8-pin SOIC package, but requires external compensation. | Ideal for space-constrained designs needing adjustable output or faster transient response. | Choose for modern, compact designs requiring flexibility-requires additional design effort vs. LM2675N-12/NOPB's simplicity. |
Compared with LM2675N-12/NOPB, LM2575H-12 trades efficiency and size for lower EMI and legacy support, while TPS54202D offers higher integration and frequency at the cost of design complexity and loss of fixed-output simplicity.
Availability
LM2675N-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for LM2675N-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 engineers seeking robust, easy-to-use DC-DC regulators with minimal external components and proven field reliability in harsh environments.
FAQ
What is the maximum input voltage rating for LM2675N-12/NOPB?
The LM2675N-12/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 6.5V to 40V. Exceeding 40V may trigger internal protection or reduce reliability; operation at 40V is validated for continuous duty in the 12V output configuration per TI SNVS129G.
Does LM2675N-12/NOPB require external feedback resistors?
No. The LM2675N-12/NOPB is a fixed-output variant: its feedback pin (FB) is internally configured for 12V regulation, and the datasheet specifies direct connection of FB to VOUT. External resistors are unnecessary and would disrupt regulation-only required for the adjustable-version LM2675MX-ADJ.
What package type does LM2675N-12/NOPB use, and is thermal pad connection required?
LM2675N-12/NOPB uses the 8-pin PDIP (P) package (9.81mm × 9.43mm). Unlike the WSON variant, the PDIP package has no exposed thermal pad; thermal performance relies on PCB copper area connected to Pin 6 (GND). No DAP connection is needed or present.
Can LM2675N-12/NOPB be synchronized to an external clock?
No. The LM2675N-12/NOPB uses an internal fixed-frequency 260kHz oscillator with no synchronization input. Frequency cannot be adjusted or locked to an external source-this is a deliberate design choice to simplify layout and ensure stability without external timing components.
What is the typical standby current of LM2675N-12/NOPB in shutdown mode?
The LM2675N-12/NOPB draws ≤100μA standby current when the ON/OFF pin is pulled below 0.8V (TJ = –40°C to 125°C), with typical value of 50μA at 25°C. This ultra-low quiescent current supports battery-backed systems requiring multi-year shelf life or low-power sleep states.
LM2675N-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2675N-12/NOPB FAQ
1.How can I place an order for LM2675N-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675N-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 LM2675N-12/NOPB reliable?
The price and inventory of LM2675N-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 LM2675N-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675N-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675N-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675N-12/NOPB?
LM2675N-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675N-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 LM2675N-12/NOPB?
For technical support, including LM2675N-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675N-12/NOPB requirements.
6.How does Aetrix verify that LM2675N-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675N-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 LM2675N-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675N-12/NOPB?
All LM2675N-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675N-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 LM2675N-12/NOPB part is unused and in its original packaging.
Return procedure for LM2675N-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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