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Texas Instruments LM2674N-12/NOPB
- Part No.:
- LM2674N-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2674N-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
LM2674N-12/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering up to 500mA output current with ±1.5% output voltage tolerance, 260kHz fixed switching frequency, and 8V–40V input range. It integrates a 0.25Ω DMOS power switch and operates as a fixed 12V output regulator in 8-pin PDIP packaging for industrial power conversion.
For engineers reviewing the LM2674N-12/NOPB datasheet, LM2674N-12/NOPB pinout, LM2674N-12/NOPB application, or LM2674N-12/NOPB equivalent, key selection criteria include its fixed 12V output, thermal shutdown protection, TTL-compatible enable control, and compatibility with standard off-the-shelf inductors and Schottky diodes in buck regulator designs.
Technical Context
The LM2674N-12/NOPB implements a voltage-mode PWM control architecture with internal frequency compensation and a fixed 260kHz oscillator. Its feedback loop regulates output by comparing FB pin voltage against an internal 1.21V reference - though for the fixed-12V version, FB is shorted to VOUT, eliminating external resistor dividers.
It features cycle-by-cycle current limiting (typ. 0.8A), thermal shutdown, and a low-quiescent-current shutdown mode (50μA typical). The integrated high-side DMOS switch enables efficient operation up to 94% efficiency at 24VIN/12VOUT/500mA, with copper PCB traces serving as sole heat sinking under normal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1.5% over line/load/temperature - eliminates need for external feedback resistors. |
| Input Voltage Range | 8V to 40V - supports wide industrial supply rails including 12V, 24V, and 36V nominal systems. |
| Max Output Current | 500mA DC - sufficient for powering microcontrollers, sensors, and analog circuitry without external boost stages. |
| Switching Frequency | 260kHz fixed - enables use of compact, low-ESR inductors (e.g., 47–68μH) and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω at TJ = 25°C - minimizes conduction loss and supports >94% peak efficiency at 24VIN/12VOUT. |
| Shutdown Current | 50μA typical - enables ultra-low-power standby in battery-backed or energy-conscious systems. |
| Oscillator Tolerance | ±10% - ensures predictable filter design margins and stable loop dynamics across temperature. |
Pinout & Package
LM2674N-12/NOPB uses the P (PDIP-8) package: 9.81mm × 9.43mm body with through-hole leads. Thermal performance is characterized by RθJA = 95°C/W with ~1 in² PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CB | Bootstrap capacitor connection | Connects 10-nF ceramic capacitor between CB and VSW to drive high-side DMOS gate; critical for proper switch turn-on. |
| 2 NC | No connect | Unbonded pad - must remain unconnected and un-routed on PCB. |
| 3 NC | No connect | Unbonded pad - no electrical function; avoid routing or soldering. |
| 4 FB | Feedback sense input | Internally tied to output for fixed-12V version; shorting FB to VOUT disables adjustable mode and configures regulation at 12V. |
| 5 ON/OFF | Enable control input | TTL-compatible logic input: ≥1.4V = active, ≤0.8V = shutdown; internal 7V pull-up allows floating for always-on operation. |
| 6 GND | Power ground | Main return path for input/output capacitors and IC substrate; requires shortest possible trace to CIN ground. |
| 7 VIN | Input supply | High-voltage input node (8–40V); connects to bulk input capacitor and high-frequency bypass cap - keep trace short and low-inductance. |
| 8 VSW | Switch node | Drain of internal DMOS switch; connects to inductor and Schottky diode cathode - high dV/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25Ω RDS(ON) enables self-contained buck topology with only five external components required. |
| Fixed 12V output configuration | Eliminates feedback resistor network, reducing BOM count, layout area, and potential drift sources in precision applications. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external sensing circuitry - automatic recovery on fault removal. |
| 260kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing across production units - avoids variable-frequency jitter issues. |
| TTL-compatible enable pin | Supports direct interfacing with microcontroller GPIOs or logic-level sequencers without level-shifting circuitry. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 12V rail for digital input conditioning circuits and optocoupler drivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V chassis supply to stable 12V for signal interface circuitry. Use Value: Delivers 500mA with <±1.5% regulation across –40°C to +125°C, ensuring reliable optocoupler LED bias and noise margin in harsh environments. | Use Scenario: Generating 12V for window lift motor controllers and door lock actuators in 12V automotive systems. IC Role / Device Role / Timing Role: Pre-regulator supplying clean 12V to downstream linear regulators or motor driver ICs. Use Value: Withstands 40V load-dump transients and maintains regulation during cold-crank (6.5V min), enabling robust subsystem power sequencing. |
| Point-of-Load for FPGAs | Test Equipment Auxiliary Supply |
Use Scenario: Local 12V supply for FPGA configuration PROMs, clock buffers, and I/O bank termination in benchtop instrumentation. IC Role / Device Role / Timing Role: Compact, low-noise buck converter placed near FPGA to minimize IR drop and supply impedance. Use Value: 260kHz switching enables small 47μH inductor and 47μF tantalum output capacitor - achieving <10mV p-p ripple at full load. | Use Scenario: Standby power source for microcontroller-based calibration logic and EEPROM storage in portable test meters. IC Role / Device Role / Timing Role: Always-on auxiliary regulator activated via ON/OFF pin during measurement cycles. Use Value: 50μA shutdown current extends battery life; fixed 12V output simplifies firmware-controlled power domain management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675N-12 | Same pinout and function but rated for 1A output current; higher RDS(ON) (0.35Ω) and slightly lower efficiency at light loads. | Supports higher-current peripherals (e.g., solenoids, displays) where 500mA is insufficient. | Select when future-proofing for >500mA loads or when board layout already accommodates larger thermal footprint. |
| TPS54202DDCR | Synchronous 2A buck with 4.5–28V input, 500kHz–2.2MHz adjustable frequency, and integrated high/low-side MOSFETs - no external diode required. | Better suited for space-constrained designs needing higher efficiency below 12VIN or dynamic frequency scaling. | Choose for new designs prioritizing size, efficiency below 12VIN, or elimination of external Schottky diode. |
Compared with LM2675N-12, the LM2674N-12/NOPB offers lower quiescent current and tighter output tolerance but less headroom for peak loads; versus TPS54202DDCR, it provides simpler BOM and proven reliability in legacy industrial systems, albeit with lower integration and fixed frequency.
Availability
LM2674N-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for LM2674N-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 LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease of use in cost-sensitive, medium-power DC-DC applications where minimal external components and robust thermal performance are critical.
FAQ
What is the maximum input voltage rating for LM2674N-12/NOPB?
The absolute maximum input voltage for LM2674N-12/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe junction temperature or triggering internal protection circuits. For automotive load-dump scenarios up to 40V, the device remains fully functional within specifications - confirmed in Section 5.3 of the official datasheet.
Does LM2674N-12/NOPB require an external feedback resistor network?
No - LM2674N-12/NOPB is the fixed 12V output variant, so the FB pin is internally configured for 12V regulation. External resistors are unnecessary; FB should be connected directly to the output capacitor. This differs from the adjustable version (LM2674MX-ADJ), which requires a resistor divider to set VOUT.
What is the thermal resistance (RθJA) of LM2674N-12/NOPB in its PDIP package?
The LM2674N-12/NOPB in the P (PDIP-8) package has a junction-to-ambient thermal resistance of 95°C/W, measured with approximately 1 square inch of PCB copper surrounding the leads. This value assumes standard FR-4 board material and single-layer copper; adding thermal vias or increasing copper area lowers effective RθJA.
Can LM2674N-12/NOPB be used with ceramic output capacitors?
Yes - LM2674N-12/NOPB is compatible with ceramic output capacitors, provided they meet minimum ESR requirements and sufficient capacitance (e.g., ≥47μF). However, low-ESR ceramics may reduce phase margin; TI recommends verifying stability with simulation or bench testing. Tantalum or polymer capacitors are preferred for guaranteed stability per the datasheet's typical application guidelines.
What protection features are built into LM2674N-12/NOPB?
LM2674N-12/NOPB includes thermal shutdown, cycle-by-cycle current limiting (typ. 0.8A), and undervoltage lockout. It also features a low-power shutdown mode (50μA typical) activated via the ON/OFF pin. These protections operate independently and do not require external components - all are documented in Sections 5.9 and 6.4 of the LM2674 datasheet.
LM2674N-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:
- 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:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2674N-12/NOPB FAQ
1.How can I place an order for LM2674N-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674N-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 LM2674N-12/NOPB reliable?
The price and inventory of LM2674N-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 LM2674N-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674N-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674N-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674N-12/NOPB?
LM2674N-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674N-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 LM2674N-12/NOPB?
For technical support, including LM2674N-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674N-12/NOPB requirements.
6.How does Aetrix verify that LM2674N-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674N-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 LM2674N-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674N-12/NOPB?
All LM2674N-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674N-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 LM2674N-12/NOPB part is unused and in its original packaging.
Return procedure for LM2674N-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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