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Texas Instruments LM2671M-12/NOPB
- Part No.:
- LM2671M-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671M-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:969
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Product details
Overview
LM2671M-12/NOPB from Texas Instruments is a monolithic 500-mA step-down (buck) DC-DC voltage regulator with fixed 12-V output, 260-kHz fixed-frequency switching, 0.25-Ω DMOS power switch, ±1.5% output voltage tolerance over line/load/temperature, and wide 6.5–40-V input range. It delivers high-efficiency power conversion in industrial power supplies and distributed regulation systems.
For engineers reviewing the LM2671M-12/NOPB datasheet, LM2671M-12/NOPB pinout, LM2671M-12/NOPB application, or LM2671M-12/NOPB equivalent, key selection criteria include verified 12-V fixed output accuracy, thermal shutdown protection, TTL-compatible ON/OFF control, soft-start capability, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2671M-12/NOPB integrates a DMOS power MOSFET switch, PWM controller, fixed 260-kHz oscillator, internal frequency compensation, and feedback amplifier - all optimized for buck topology operation without external compensation. Its architecture uses cycle-by-cycle current limiting and thermal shutdown to ensure fault resilience.
It operates in active mode when ON/OFF pin voltage exceeds 1.4 V, entering low-power shutdown (<100 μA) below 0.8 V. The FB pin is internally connected to the 12-V output divider, eliminating external resistors; the SYNC pin supports external clock synchronization up to 400 kHz while disabling frequency foldback during sync operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±1.5% over full temperature and load range - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Max Output Current | 500 mA continuous - supports mid-power subsystems such as sensor interfaces or microcontroller peripherals. |
| Input Voltage Range | 6.5 V to 40 V - accommodates unregulated 12-V, 24-V, and 36-V industrial bus inputs with margin. |
| Switching Frequency | 260 kHz (±10%) - enables compact LC filter design with standard 10–100 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25 Ω typical at 25°C - minimizes conduction loss and supports >94% efficiency at 24-VIN/12-VOUT/500-mA conditions. |
| Quiescent Current | 3.6 mA typical - balances light-load efficiency and startup responsiveness in always-on systems. |
| Standby Current | 50 μA typical - enables ultra-low-power disable states for battery-backed or energy-sensitive applications. |
Pinout & Package
LM2671M-12/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed thermal pad not present - thermal management relies on PCB copper area per RθJA = 105°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to VSW to gate-drive high-side DMOS switch fully ON - critical for low RDS(ON) and efficiency. |
| SS | Soft-start control | Capacitor-to-ground sets output voltage ramp time - prevents inrush current and stabilizes startup into capacitive loads. |
| SYNC | Frequency synchronization input | TTL/CMOS-compatible input; open-circuit defaults to 260-kHz operation; external clock up to 400 kHz enables EMI shaping and multi-rail synchronization. |
| FB | Feedback sense | Internally tied to 12-V output divider - no external resistors required; provides precise regulation without calibration overhead. |
| ON/OFF | Enable/disable control | Logic-level input: >1.4 V = active, <0.8 V = shutdown; internal 20-μA pull-up simplifies interface with microcontrollers or power sequencers. |
| VSW | Switch node output | Drain of internal DMOS FET - connects to inductor and Schottky diode cathode; high dv/dt node requiring tight layout and ground shielding. |
| GND | Power ground | Primary return path for input/output capacitors and switch current - must be low-inductance, short-trace connection to minimize noise and instability. |
| VIN | Input supply | Accepts 6.5–40 V DC; requires local 22-μF tantalum bypass capacitor placed adjacent to pin to suppress high-frequency ripple and stabilize internal bias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25-Ω RDS(ON) enables self-contained buck conversion with minimal external components and no external MOSFET driver needed. |
| Fixed 12-V output configuration | Internal resistor divider eliminates external feedback network - reduces BOM count, layout area, and calibration risk for dedicated 12-V rails. |
| 260-kHz fixed-frequency PWM | Predictable switching allows deterministic EMI filtering and consistent inductor sizing across designs without loop tuning. |
| TTL-compatible ON/OFF control | Direct interfacing with 3.3-V or 5-V logic outputs enables seamless integration into power sequencing architectures without level-shifting. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating - latches off until junction cools, preventing catastrophic failure in enclosed environments. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery or 36-V industrial bus to regulated 12-V rail for ECUs, sensors, and actuators. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable 12-V supply with built-in fault protection and thermal resilience. Use Value: Eliminates need for external current-sense resistors or discrete protection ICs - reduces solution size by >30% versus discrete buck controllers. |
Use Scenario: Powering LIN transceivers, LED drivers, and window lift motor controllers in automotive body electronics. IC Role / Device Role / Timing Role: High-reliability 12-V point-of-load regulator supporting cold-crank (6.5-V min) and load-dump (40-V max) conditions. Use Value: ±1.5% output tolerance and 125°C max junction rating ensure compliance with AEC-Q100 Class 2 requirements without derating. |
| Programmable Logic Controller (PLC) I/O Module | Test & Measurement Equipment |
|
Use Scenario: Generating isolated 12-V auxiliary supply for analog front-end circuitry and digital isolators in modular PLC backplanes. IC Role / Device Role / Timing Role: Pre-regulator stage feeding linear regulators or LDOs - improves overall system efficiency vs. direct linear conversion. Use Value: 94% efficiency at 24-VIN/12-VOUT/500-mA reduces heat dissipation in densely packed modules, enabling fanless operation. |
Use Scenario: Providing clean, stable 12-V bias for op-amps, ADC references, and signal conditioning stages in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, well-regulated DC source with soft-start to prevent transient coupling into sensitive analog signal paths. Use Value: Soft-start (via SS pin) limits inrush to <100 mA and avoids voltage droop on shared supply rails during power-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672MX-12/NOPB | Same pinout, identical electrical specs, but in 8-pin SOIC with moisture-sensitive level 2a packaging - differs only in tape-and-reel handling and humidity sensitivity. | Identical functional use; preferred for automated SMT assembly with strict MSL compliance requirements. | Select LM2672MX-12/NOPB when JEDEC-standard MSL2a compliance is mandated for reflow process control. |
| TPS5430DDAR | 3-A output capability, 500-kHz switching, integrated high-side FET, but requires external compensation and has different pinout - not pin-compatible. | Better suited for higher-current or space-constrained designs where efficiency above 90% at light loads is critical. | Choose TPS5430DDAR only when >500-mA output or adjustable frequency is required - redesign of layout and feedback network is necessary. |
Compared with LM2671M-12/NOPB, LM2672MX-12/NOPB offers identical performance with enhanced manufacturability, while TPS5430DDAR trades simplicity and pin compatibility for higher current and flexibility - making LM2671M-12/NOPB optimal for cost-sensitive, medium-power fixed-output applications where minimal external parts and proven reliability are prioritized.
Availability
LM2671M-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM2671M-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, minimal external component count, and robust operation in industrial and automotive environments without requiring complex compensation or layout expertise.
FAQ
What is the maximum input voltage rating for LM2671M-12/NOPB?
The absolute maximum input voltage for LM2671M-12/NOPB is 45 V, but the recommended operating range is 6.5 V to 40 V. Operation beyond 40 V risks exceeding safe operating area limits and may trigger thermal shutdown or reduce long-term reliability - always maintain VIN ≤ 40 V in continuous operation per TI's recommended conditions.
Does LM2671M-12/NOPB require external feedback resistors?
No, LM2671M-12/NOPB does not require external feedback resistors. Its FB pin is internally connected to a precision voltage divider set for 12 V output, delivering ±1.5% regulation accuracy across line, load, and temperature without external components - a key advantage over adjustable regulators like the LM2671MX-ADJ/NOPB.
Can LM2671M-12/NOPB synchronize to an external clock?
Yes, LM2671M-12/NOPB supports external clock synchronization via its SYNC pin. When driven with a TTL/CMOS-compatible signal (0–>3 V), it locks to frequencies up to 400 kHz. Note that frequency foldback protection is disabled during sync mode, so short-circuit response relies solely on current limiting and thermal shutdown.
What is the thermal resistance (RθJA) of LM2671M-12/NOPB in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for LM2671M-12/NOPB in the 8-pin SOIC (D) package is 105°C/W under standard JEDEC test conditions (1 in² copper). Actual thermal performance improves significantly with additional PCB copper area, thermal vias, and proper GND plane layout - critical for sustaining 500-mA output at elevated ambient temperatures.
How does the ON/OFF pin function on LM2671M-12/NOPB?
The ON/OFF pin on LM2671M-12/NOPB provides logic-level enable control: voltage >1.4 V enables regulation (active mode), while <0.8 V disables the IC into low-power standby (50 μA typical). An internal 20-μA pull-up allows direct connection to microcontroller GPIOs - no external pull-up resistor is needed unless driving from open-drain sources.
LM2671M-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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
LM2671M-12/NOPB FAQ
1.How can I place an order for LM2671M-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671M-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 LM2671M-12/NOPB reliable?
The price and inventory of LM2671M-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 LM2671M-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671M-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671M-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671M-12/NOPB?
LM2671M-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671M-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 LM2671M-12/NOPB?
For technical support, including LM2671M-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671M-12/NOPB requirements.
6.How does Aetrix verify that LM2671M-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671M-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 LM2671M-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671M-12/NOPB?
All LM2671M-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671M-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 LM2671M-12/NOPB part is unused and in its original packaging.
Return procedure for LM2671M-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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