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Texas Instruments LM2671N-12/NOPB
- Part No.:
- LM2671N-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2671N-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
LM2671N-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC 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-fed systems requiring stable mid-range voltage rails.
For engineers reviewing the LM2671N-12/NOPB datasheet, LM2671N-12/NOPB pinout, LM2671N-12/NOPB application, or LM2671N-12/NOPB equivalent, key selection criteria include its fixed 12 V output, thermal shutdown and current-limit protection, TTL-compatible ON/OFF control, soft-start capability, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2671N-12/NOPB implements a voltage-mode PWM controller with an internal 260 kHz oscillator and integrated high-side DMOS FET. Its feedback loop uses a precision 1.21 V reference and high-gain error amplifier referenced to the FB pin - for fixed-output versions, FB is internally connected to the output, eliminating external resistors. The device operates in continuous conduction mode (CCM) across its rated load range and features cycle-by-cycle current limiting with thermal foldback.
Functional modes include active regulation (ON/OFF ≥ 1.4 V), low-power shutdown (ON/OFF ≤ 0.8 V, ISTBY = 50 μA typical), and frequency synchronization via the SYNC pin. Soft-start is implemented by charging an external capacitor on the SS pin, controlling output ramp rate; the CB pin provides bootstrap drive for the high-side switch, requiring a 100 nF ceramic capacitor tied to VSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±1.5% over full line, load, and temperature range - ensures stable rail for logic, analog, and interface ICs without external feedback components. |
| Max Output Current | 500 mA ensured - supports moderate-power loads such as microcontrollers, sensors, and communication modules without derating. |
| Input Voltage Range | 6.5 V to 40 V - accommodates wide-input industrial, automotive, and telecom supply buses including 12 V, 24 V, and 36 V nominal systems. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact, low-ESR inductors and capacitors while maintaining EMI below critical bands. |
| Efficiency | 94% typical at VIN = 24 V, IOUT = 500 mA - minimizes thermal stress and eliminates need for heatsinks on PCB copper traces. |
| RDS(ON) | 0.25 Ω (typical at TJ = 25°C) - reduces conduction loss and improves light-load efficiency compared to higher-RDS(ON) alternatives. |
| Quiescent Current | 3.6 mA typical (active), 50 μA typical (shutdown) - enables low-power standby operation in battery-backed or energy-conscious systems. |
Pinout & Package
LM2671N-12/NOPB is packaged in an 8-pin PDIP (Plastic Dual In-line Package) with body size 9.81 mm × 6.35 mm. Pin 1 is CB (bootstrap capacitor connection), Pin 2 is SS (soft-start), Pin 3 is SYNC (frequency sync input), Pin 4 is FB (feedback input), Pin 5 is ON/OFF (enable control), Pin 6 is GND (power ground), Pin 7 is VIN (input supply), and Pin 8 is VSW (switch node). Pins 2, 3, 5, and 7 are NC in PDIP but functionally assigned per datasheet; only pins 1, 4, 6, 7, and 8 are electrically active in fixed-output configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Drives gate of internal high-side DMOS FET above VIN to ensure full enhancement; requires 100 nF ceramic cap to VSW. |
| SS (Pin 2) | Soft-start control | External capacitor sets output voltage ramp time; floating disables soft-start - prevents inrush current during power-up. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts external TTL/CMOS clock >275 kHz to align switching frequency; open-circuit defaults to 260 kHz internal oscillator. |
| FB (Pin 4) | Feedback sense input | Internally tied to output for fixed 12 V version - no external divider needed; enables precise regulation without component tolerance drift. |
| ON/OFF (Pin 5) | Enable/disable control | TTL-compatible input: ≥1.4 V = ON, ≤0.8 V = OFF; 50 μA standby current allows low-power system-level sequencing. |
| GND (Pin 6) | Power ground reference | Primary return path for VIN, VSW, and internal circuitry; must be short, low-impedance connection to minimize noise and thermal resistance. |
| VIN (Pin 7) | Main input supply | Accepts 6.5–40 V DC; powers internal bias circuits and high-side switch; requires local 22 μF tantalum bypass capacitor. |
| VSW (Pin 8) | Switch node output | Drains internal DMOS FET; connects to inductor and Schottky catch diode cathode - high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25 Ω DMOS power switch | Reduces external component count and conduction losses - enables 94% efficiency at full load without discrete MOSFETs or drivers. |
| Fixed 12 V output with ±1.5% tolerance | Eliminates feedback resistor network and associated drift/error sources - simplifies design validation and improves long-term output stability. |
| 260 kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter and simplifies compliance testing. |
| TTL-compatible ON/OFF control | Supports direct interfacing with microcontroller GPIOs or logic sequencers without level-shifting - enables precise power-state coordination. |
| Thermal shutdown + current limit protection | Provides autonomous fault recovery under overload, short-circuit, or ambient overheating - protects both IC and downstream circuitry without external supervision. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V vehicle battery or 36 V industrial bus to regulated 12 V for auxiliary subsystems. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, efficient 12 V rail for microcontrollers, CAN transceivers, and sensor interfaces. Use Value: High 94% efficiency minimizes heat buildup in enclosed enclosures; wide 6.5–40 V input handles cold-crank and load-dump transients. | Use Scenario: Powering door lock actuators, window lift motors, and interior lighting controllers in modern vehicles. IC Role / Device Role / Timing Role: Mid-power DC-DC stage supplying 12 V to mixed-signal control boards where space and thermal constraints prohibit linear regulators. Use Value: Integrated current limit and thermal shutdown prevent latch-up during motor stall or wiring faults - enhancing system reliability. |
| Distributed Telecom Power | Test & Measurement Equipment |
Use Scenario: Generating localized 12 V rails from 48 V backplane in modular telecom shelves or base station subracks. IC Role / Device Role / Timing Role: Point-of-load (POL) converter delivering stable 12 V to FPGA I/O banks, ADC/DAC references, and clock buffers. Use Value: Fixed-frequency operation allows synchronized ripple cancellation across multiple rails; soft-start prevents backplane voltage sag during hot-insertion. | Use Scenario: Providing isolated 12 V bias for precision op-amps, reference ICs, and signal chain components in portable analyzers. IC Role / Device Role / Timing Role: Low-noise, high-accuracy voltage source supporting <1 mV output ripple requirements in sensitive analog front-ends. Use Value: Tight ±1.5% output tolerance ensures measurement repeatability; 50 μA shutdown current extends battery life in handheld units. |
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 SOIC-8 package (4.90 mm × 3.91 mm) instead of PDIP - lower thermal resistance (RθJA = 105°C/W vs. 95°C/W). | Better suited for space-constrained PCBs and automated assembly; less suitable for prototyping or through-hole hand-soldering. | Select LM2672MX-12/NOPB when board area or reflow compatibility is prioritized over manual serviceability. |
| LM2575HVT-12 | 5-pin TO-220 package, 52 kHz switching frequency, 1 A output, higher RDS(ON) (0.4 Ω), lower efficiency (~88% at 24 V/500 mA). | Designed for higher-current, lower-frequency applications where EMI filtering is easier and thermal mass is available. | Choose LM2575HVT-12 only when 1 A output or TO-220 mounting is required - not a drop-in replacement due to different pinout and frequency. |
Compared with LM2672MX-12/NOPB, the LM2671N-12/NOPB offers identical regulation performance but in a through-hole PDIP package ideal for lab validation and legacy designs; versus LM2575HVT-12, it delivers higher efficiency and smaller passive components at the cost of lower max current and fixed-frequency EMI profile.
Availability
LM2671N-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, distributed telecom power systems, and test & measurement equipment requiring stable component supply and long-lifecycle support.
Supply support for LM2671N-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in electronic components.
The LM2671 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in non-isolated DC-DC buck applications - emphasizing minimal external components, robust protection, and broad input voltage support for industrial and commercial systems.
FAQ
What is the maximum input voltage rating for the LM2671N-12/NOPB?
The LM2671N-12/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 6.5 V to 40 V. Operation beyond 40 V risks exceeding safe junction temperature or triggering internal protection circuits. For sustained reliability, maintain VIN ≤ 40 V under all conditions including transients - verified in TI's SNVS008L datasheet Section 7.1.
Does the LM2671N-12/NOPB require external feedback resistors?
No, the LM2671N-12/NOPB does not require external feedback resistors. As a fixed-output variant, its internal feedback divider is factory-trimmed to deliver precisely 12 V - the FB pin is internally connected to the output. This eliminates resistor tolerance errors and simplifies layout, distinguishing it from the adjustable LM2671MX-ADJ version which requires two external resistors.
Can the LM2671N-12/NOPB be synchronized to an external clock?
Yes, the LM2671N-12/NOPB supports external frequency synchronization via its SYNC pin (Pin 3). When driven with a TTL/CMOS-compatible clock signal >275 kHz, the internal 260 kHz oscillator locks to the external source. This feature enables EMI reduction through frequency alignment and is detailed in Section 8.3.5 of the LM2671N-12/NOPB datasheet.
What thermal considerations apply to the LM2671N-12/NOPB in PDIP package?
The LM2671N-12/NOPB in PDIP (P package) has a junction-to-ambient thermal resistance (RθJA) of 95°C/W under standard JEDEC test conditions. To maintain TJ ≤ 125°C at full 500 mA load, keep ambient temperature ≤ 77°C or add copper pour and thermal vias. Unlike SOIC or WSON variants, PDIP relies on lead-frame conduction - avoid excessive solder mask over pads.
Is the LM2671N-12/NOPB RoHS compliant and lead-free?
Yes, the LM2671N-12/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free", confirming compliance with EU Directive 2011/65/EU and TI's green packaging standards. Full material declarations and test reports are available in TI's official product change notices and environmental compliance documentation.
LM2671N-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:
- 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
LM2671N-12/NOPB FAQ
1.How can I place an order for LM2671N-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671N-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 LM2671N-12/NOPB reliable?
The price and inventory of LM2671N-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 LM2671N-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671N-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671N-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671N-12/NOPB?
LM2671N-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671N-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 LM2671N-12/NOPB?
For technical support, including LM2671N-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671N-12/NOPB requirements.
6.How does Aetrix verify that LM2671N-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671N-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 LM2671N-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671N-12/NOPB?
All LM2671N-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671N-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 LM2671N-12/NOPB part is unused and in its original packaging.
Return procedure for LM2671N-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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