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Texas Instruments LM2671MX-12/NOPB
- Part No.:
- LM2671MX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671MX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,346
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Product details
Overview
LM2671MX-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering 500 mA output current with fixed 12 V output, 260 kHz fixed-frequency operation, ±1.5% output voltage tolerance over line/load/temperature, and 94% peak efficiency at 24 VIN/500 mA. It integrates a 0.25 Ω DMOS power switch and supports input voltages from 6.5 V to 40 V - used in industrial power supplies, distributed power architectures, and battery-powered systems requiring stable mid-rail voltage conversion.
For engineers reviewing the LM2671MX-12/NOPB datasheet, LM2671MX-12/NOPB pinout, LM2671MX-12/NOPB application, or LM2671MX-12/NOPB equivalent, key selection criteria include verified 12 V fixed-output regulation accuracy, thermal shutdown/current-limit protection integrity, SOIC-8 package layout compatibility, and soft-start timing control via external capacitor.
Technical Context
The LM2671MX-12/NOPB implements a current-mode PWM controller with internal 260 kHz oscillator and integrated high-side DMOS FET. Its feedback loop uses direct connection of FB pin to output (no external divider), enabling precise 12 V regulation without resistor tolerance drift.
It operates in active mode when ON/OFF pin voltage exceeds 1.4 V, entering low-power shutdown (<100 μA IQ) below 0.8 V. The CB–VSW bootstrap network ensures full gate drive for the internal switch, maintaining low RDS(ON) across temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±1.5% over −40°C to +125°C, VIN = 15–40 V, ILOAD = 20–500 mA - eliminates need for external feedback resistors and ensures stable rail for analog/digital subsystems. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact, standard-value inductors (e.g., 68 µH) and reduces EMI filtering complexity vs. lower-frequency buck converters. |
| Max Output Current | 500 mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs without external current boosting. |
| RDS(ON) | 0.25 Ω typical at TJ = 25°C - minimizes conduction loss and self-heating, allowing PCB copper traces alone to serve as heat sink. |
| Input Voltage Range | 6.5 V to 40 V - supports wide-range industrial inputs (e.g., 24 V nominal systems with transients) and unregulated battery-derived rails. |
| Efficiency | 94% typical at VIN = 24 V, ILOAD = 500 mA - reduces thermal stress and improves system-level power budget in space-constrained enclosures. |
| Shutdown Current | 50 µA typical - enables ultra-low-power standby in battery-backed applications without external enable circuitry. |
Pinout & Package
LM2671MX-12/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Pin functions are validated per TI SNVS008L Rev L datasheet (June 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor node | Connects 100 nF ceramic capacitor to VSW to generate gate drive voltage > VIN for full enhancement of internal DMOS switch. |
| SS (Pin 2) | Soft-start control | External capacitor to GND sets output voltage ramp time; floating disables soft-start - prevents inrush current during power-up. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts TTL/CMOS clock >275 kHz to align switching frequency; open-circuit defaults to 260 kHz - enables EMI reduction via frequency dithering or system-level clock alignment. |
| FB (Pin 4) | Feedback sense input | Internally connected to 12 V reference; direct tie to output ensures accurate regulation without external resistive divider - simplifies layout and improves stability. |
| ON/OFF (Pin 5) | Enable/disable control | Logic-high (>1.4 V) enables regulation; ≤0.8 V forces shutdown with 50 µA IQ - provides system-level power sequencing capability. |
| VSW (Pin 8) | Switch node output | Drives external catch diode and inductor; swings from VIN to ~−0.5 V - requires short, low-inductance routing to minimize ringing and EMI. |
| GND (Pin 6) | Power ground | Primary return path for input/output capacitors and inductor - must be tied directly to low-impedance ground plane to maintain current-loop integrity. |
| VIN (Pin 7) | Input supply | Accepts 6.5–40 V DC; bypassed with 22 µF tantalum close to pin - supplies both load and internal bias circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25 Ω RDS(ON) enables high-efficiency 500 mA operation without external MOSFET or driver, reducing BOM count and board area. |
| Fixed 12 V output with no external feedback | Eliminates resistor tolerance error and thermal drift impact on output accuracy - delivers ±1.5% regulation across full operating range. |
| 260 kHz fixed-frequency PWM | Enables predictable EMI spectrum and consistent filter design using off-the-shelf 68 µH inductors and 47 µF output capacitors. |
| Thermal shutdown + current limit protection | Automatically disables switching under overload or overtemperature, preventing device damage without external monitoring circuitry. |
| Soft-start with external capacitor control | Adjustable output voltage ramp rate avoids input inrush and output overshoot - critical for powering sensitive analog or mixed-signal loads. |
Applications
| Industrial Power Supply | Distributed Power Architecture |
|---|---|
|
Use Scenario: Converting 24 V bus to regulated 12 V for PLC I/O modules, motor drivers, and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, low-noise 12 V rail with tight line/load regulation and thermal fault protection. Use Value: Delivers 94% efficiency at 24 VIN/500 mA, minimizing heat buildup in sealed enclosures while maintaining ±1.5% output accuracy over −40°C to +85°C ambient. |
Use Scenario: Local point-of-load (POL) conversion in telecom shelf systems where multiple 12 V sub-systems require independent regulation from a common 48 V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck converter enabling modular power design with minimal external components and no external compensation. Use Value: SOIC-8 footprint allows dense placement near load; 260 kHz switching permits small 68 µH inductors and reduces filter volume by >40% vs. 100 kHz alternatives. |
| Battery-Powered Test Equipment | Automotive Aftermarket Electronics |
|
Use Scenario: Regulating 12–36 V LiFePO₄ or lead-acid battery packs to stable 12 V for portable oscilloscopes, multimeters, and calibration tools. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator with shutdown control for battery conservation and soft-start to prevent brownout during cold cranking. Use Value: 6.5–40 V input range accommodates deep discharge and charging peaks; 50 µA shutdown current extends battery life in standby modes. |
Use Scenario: Powering infotainment displays, USB hubs, and CAN transceivers from vehicle 12 V battery with wide input variation (6–16 V) and load dump immunity. IC Role / Device Role / Timing Role: Robust mid-rail regulator handling automotive transients up to 40 V, with thermal shutdown protecting against engine bay overheating. Use Value: Internal current limiting and thermal shutdown eliminate need for external protection ICs; ±1.5% output tolerance ensures reliable operation of display backlight drivers and audio amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671M-12/NOPB | Same electrical specs but in PDIP-8 package (9.81 mm × 6.35 mm); higher θJA (95°C/W vs. 105°C/W for SOIC); no moisture sensitivity level rating. | Preferred for through-hole prototyping or legacy board rework; unsuitable for high-density SMT production. | Select LM2671M-12/NOPB only when manual assembly or socket-based testing is required. |
| LM2672MX-12 | Pin-compatible upgrade with improved efficiency (96% vs. 94%), lower quiescent current (2.5 mA vs. 3.6 mA), and enhanced ESD rating (±2 kV HBM vs. same), but obsolete per TI PCN. | Not recommended for new designs due to discontinuation; limited long-term availability and no RoHS-6 compliance. | LM2671MX-12/NOPB remains preferred for new industrial designs requiring active support and full RoHS-6 compliance. |
Compared with LM2671M-12/NOPB, the LM2671MX-12/NOPB offers superior thermal performance in SMT layouts and tighter manufacturing controls; versus LM2672MX-12, it trades marginal efficiency gain for guaranteed long-term supply and full regulatory compliance - making it the optimal choice for volume production of industrial and automotive-adjacent equipment.
Availability
LM2671MX-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, distributed POL systems, and battery-powered test equipment requiring stable component supply, RoHS-6 compliance, and extended temperature support (−40°C to +125°C).
Supply support for LM2671MX-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 LM2671 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in cost-sensitive, medium-current DC-DC applications where minimal external components, robust protection, and fast time-to-market are critical.
FAQ
What is the maximum input voltage rating for LM2671MX-12/NOPB?
The absolute maximum input voltage for LM2671MX-12/NOPB is 45 V, but the recommended operating range is 6.5 V to 40 V per TI SNVS008L. Operation above 40 V risks permanent damage, while below 6.5 V prevents proper regulation. For automotive load-dump scenarios, external clamping is advised since the IC lacks built-in transient protection beyond its 45 V absolute max rating.
Does LM2671MX-12/NOPB require external feedback resistors?
No, LM2671MX-12/NOPB does not require external feedback resistors. As a fixed 12 V output variant, it internally connects the FB pin to a precision 12 V reference. The FB pin must be wired directly to the output capacitor for regulation - adding external resistors would disrupt the factory-trimmed accuracy and is explicitly prohibited in the datasheet.
Can LM2671MX-12/NOPB synchronize to an external clock?
Yes, LM2671MX-12/NOPB supports external clock synchronization via the SYNC pin (Pin 3). An external TTL/CMOS clock >275 kHz (e.g., 300–400 kHz) can be AC-coupled to SYNC to force switching alignment. This feature is used to reduce beat frequencies in multi-regulator systems or shift EMI energy away from sensitive bands - but disables current-limit frequency foldback during sync operation.
What thermal considerations apply to LM2671MX-12/NOPB in SOIC-8 package?
LM2671MX-12/NOPB in SOIC-8 has a junction-to-ambient thermal resistance (RθJA) of 105°C/W with standard 1-inch² PCB copper. To sustain 500 mA continuously at high ambient temperatures, designers must provide ≥2 cm² of 2-oz copper connected to GND pins (Pins 6 and 7), avoid enclosing the IC, and ensure airflow or heatsinking if TA exceeds 70°C - as thermal shutdown activates at 150°C junction temperature.
Is LM2671MX-12/NOPB compatible with WEBENCH® design tools?
Yes, LM2671MX-12/NOPB is fully supported in TI's WEBENCH® Power Designer. The tool auto-generates complete schematics, bill-of-materials, efficiency plots, thermal simulations, and PCB layout recommendations using validated models. It selects optimized 68 µH inductors and 47 µF output capacitors per TI's reference design, accelerating development while ensuring compliance with SNVS008L electrical characteristics.
LM2671MX-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
LM2671MX-12/NOPB FAQ
1.How can I place an order for LM2671MX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671MX-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 LM2671MX-12/NOPB reliable?
The price and inventory of LM2671MX-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 LM2671MX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671MX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671MX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671MX-12/NOPB?
LM2671MX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671MX-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 LM2671MX-12/NOPB?
For technical support, including LM2671MX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671MX-12/NOPB requirements.
6.How does Aetrix verify that LM2671MX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671MX-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 LM2671MX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671MX-12/NOPB?
All LM2671MX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671MX-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 LM2671MX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2671MX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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