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Texas Instruments LM2674MX-12/NOPB
- Part No.:
- LM2674MX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674MX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
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Product details
Overview
LM2674MX-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 switch and operates as a fixed 12V output regulator in an 8-pin SOIC package for industrial power conversion.
For engineers reviewing the LM2674MX-12/NOPB datasheet, LM2674MX-12/NOPB pinout, LM2674MX-12/NOPB application, or LM2674MX-12/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for production-grade buck regulator deployment.
Technical Context
The LM2674MX-12/NOPB implements a voltage-mode control architecture with internal frequency compensation and a fixed 260kHz oscillator. Its feedback loop regulates output by comparing FB pin voltage to a precise 1.21V internal reference - but for the fixed-12V variant, FB is shorted directly to VOUT, eliminating external resistors.
It features TTL-compatible ON/OFF control with 1.4V turn-on threshold and 50μA standby current, thermal shutdown, cycle-by-cycle current limiting (0.62–1.25A), and built-in protection against overcurrent, overtemperature, and under-voltage lockout. The bootstrap capacitor (CB) enables high-side gate drive without external charge pumps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1.5% over line/load/temperature - eliminates need for feedback divider and simplifies layout. |
| Max Output Current | 500mA DC - supports mid-power loads such as microcontroller cores, sensors, and analog front-ends. |
| Input Voltage Range | 8V to 40V - accommodates 12V/24V industrial rails and tolerates automotive load-dump transients. |
| Switching Frequency | 260kHz (±10%) - enables use of compact, low-cost 22–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω typical at 25°C - minimizes conduction loss and supports >94% efficiency at 24VIN/12VOUT/500mA. |
| Quiescent Current | 3.6mA typical - ensures low no-load power draw in always-on systems. |
| Standby Current | 50μA typical - enables ultra-low-power shutdown mode for battery-backed or energy-sensitive applications. |
| Oscillator Stability | ±10% over –40°C to +125°C - guarantees consistent timing for predictable filter sizing and ripple behavior. |
Pinout & Package
LM2674MX-12/NOPB uses an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed pad not present. Thermal performance relies on PCB copper area; RθJA = 105°C/W with ~1 in² copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CB) | Bootstrap capacitor connection | Connects 10nF ceramic capacitor to VSW; enables high-side FET gate drive without external supply. |
| 4 (FB) | Feedback sense input | Internally tied to 12V output - no external resistor network required; simplifies BOM and layout. |
| 5 (ON/OFF) | Enable control input | TTL-compatible; ≥1.4V enables regulation, <0.8V disables with 50μA standby draw - supports microcontroller GPIO control. |
| 6 (GND) | Power ground | Main return path for input/output capacitors and IC substrate; must be low-impedance with short trace to CIN. |
| 7 (VIN) | Input supply | Accepts 8–40V DC; requires local 22μF tantalum bypass capacitor placed adjacent to pin with minimal loop area. |
| 8 (VSW) | Switch node output | Drives external inductor and Schottky catch diode; high dv/dt node requiring tight layout and guard ring. |
| 2, 3 (NC) | No-connect | Not bonded internally - must remain unconnected; floating or grounded per PCB design rules only. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates feedback resistors and associated layout sensitivity - reduces component count and improves long-term stability. |
| Integrated 0.25Ω DMOS switch | Reduces external component count and board space vs. controller-only solutions; enables single-chip 500mA buck conversion. |
| 260kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing - avoids subharmonic oscillation risks seen in variable-frequency designs. |
| TTL shutdown with 50μA standby | Allows direct interfacing with logic-level microcontrollers without level-shifting; supports low-power sleep modes in portable systems. |
| Thermal shutdown + current limit | Provides autonomous fault recovery without external circuitry - protects against overload, short-circuit, and ambient overheating. |
| Requires only five external components | Minimal BOM: input cap, output cap, inductor, catch diode, bootstrap cap - accelerates prototyping and reduces qualification effort. |
Applications
| Industrial Power Supply | Automotive Subsystem Regulator |
|---|---|
|
Use Scenario: Converting 24V vehicle battery rail to stable 12V for infotainment display backlight drivers and CAN transceivers. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator providing regulated 12V with transient immunity during cold-crank and load-dump events. Use Value: 8–40V input range withstands automotive transients; 500mA output supports multiple peripherals; fixed 12V eliminates tuning errors. |
Use Scenario: Generating 12V from 24V industrial PLC backplane for I/O module sensor excitation and signal conditioning. IC Role / Device Role / Timing Role: Mid-power buck converter powering analog front-ends and isolated ADC references in harsh EMI environments. Use Value: 260kHz switching allows small LC filters; thermal shutdown prevents field failure under sustained overload; SOIC package supports wave soldering. |
| Embedded System Pre-regulator | Test Equipment Auxiliary Rail |
|
Use Scenario: Providing clean 12V intermediate rail for downstream LDOs feeding FPGA I/O banks and memory interfaces. IC Role / Device Role / Timing Role: Efficient preregulator reducing thermal load on linear regulators while maintaining tight output tolerance. Use Value: ±1.5% output accuracy ensures LDO headroom margin; 94% efficiency at 24V→12V minimizes heat sink requirements. |
Use Scenario: Delivering stable 12V to analog calibration circuits and precision DACs in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise, well-regulated auxiliary supply where output stability directly impacts measurement accuracy. Use Value: Internal compensation eliminates external compensation networks; fixed output avoids drift from resistor aging or tempco mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675MX-12/NOPB | Same pinout and function but rated for 1A output current; higher RDS(ON) (0.3Ω) and slightly lower efficiency at light loads. | Supports higher-current loads without redesign; requires verification of thermal margin in same SOIC footprint. | Select when future-proofing for >500mA loads or when margin against current-limit foldback is critical. |
| TPS5430DDAR | Synchronous buck with 3A rating, 500kHz–3MHz adjustable frequency, and integrated high/low-side FETs; different pinout and control scheme. | Delivers higher efficiency across wider load range and enables smaller magnetics; requires full schematic/layout revision. | Choose for new designs needing >95% efficiency, reduced EMI via spread-spectrum option, or tighter output regulation (±1%). |
Compared with LM2675MX-12/NOPB, the LM2674MX-12/NOPB offers lower quiescent current and better light-load efficiency but less peak current headroom; versus TPS5430DDAR, it trades integration and efficiency for drop-in compatibility, simpler layout, and proven reliability in legacy industrial systems.
Availability
LM2674MX-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2674MX-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 experience in high-reliability power conversion ICs.
The LM2674 series was designed as a SIMPLE SWITCHER® solution for cost-sensitive, medium-power DC-DC conversion - prioritizing ease-of-use, minimal external components, and robust operation in industrial and automotive environments.
FAQ
What is the maximum input voltage rating for LM2674MX-12/NOPB?
The absolute maximum input voltage for LM2674MX-12/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding internal device stress limits and may trigger overvoltage protection or reduce long-term reliability. For automotive applications with load-dump transients, external clamping or filtering is advised before the VIN pin.
Does LM2674MX-12/NOPB require an external feedback resistor network?
No, LM2674MX-12/NOPB is a fixed-output version - the FB pin is internally configured for 12V regulation, and the datasheet specifies direct connection of FB to the output capacitor. Adding external resistors will disrupt regulation and may cause overvoltage. This differs from the adjustable LM2674MX-ADJ variant, which requires a resistor divider.
Can LM2674MX-12/NOPB be used in synchronous rectification configurations?
No, LM2674MX-12/NOPB is a non-synchronous buck converter that requires an external Schottky catch diode. It does not support synchronous rectification because it lacks a low-side gate driver output. For synchronous operation, consider TI's TPS5430DDAR or LM2675SX-12/NOPB with external MOSFET control - but those require different pinouts and design changes.
What thermal considerations apply to LM2674MX-12/NOPB in SOIC package?
LM2674MX-12/NOPB in SOIC has RθJA = 105°C/W with 1 in² copper; derating begins above 85°C ambient. To maintain safe junction temperature (<125°C), ensure ≥2 cm² of 2-oz copper connected to GND pins, minimize VIN-GND and VSW-GND loop areas, and avoid enclosing the IC in sealed enclosures without airflow. Thermal vias under GND pads improve performance.
Is LM2674MX-12/NOPB pin-compatible with other LM2674 variants?
Yes - all LM2674 variants in SOIC-8 (including LM2674MX-3.3/NOPB, LM2674MX-5.0/NOPB, LM2674MX-ADJ/NOPB) share identical pinout and footprint. However, FB pin behavior differs: fixed versions tie FB to VOUT internally, while the ADJ version requires external resistors. Swapping variants requires updating feedback connections and verifying output capacitor ESR ratings.
LM2674MX-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:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2674MX-12/NOPB FAQ
1.How can I place an order for LM2674MX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674MX-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 LM2674MX-12/NOPB reliable?
The price and inventory of LM2674MX-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 LM2674MX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674MX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674MX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674MX-12/NOPB?
LM2674MX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674MX-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 LM2674MX-12/NOPB?
For technical support, including LM2674MX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674MX-12/NOPB requirements.
6.How does Aetrix verify that LM2674MX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674MX-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 LM2674MX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674MX-12/NOPB?
All LM2674MX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674MX-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 LM2674MX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2674MX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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