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Texas Instruments LM2671N-5.0/NOPB
- Part No.:
- LM2671N-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2671N-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LM2671N-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering 5 V ±1.5% output at up to 500 mA, operating from 6.5 V to 40 V input, with 260 kHz fixed-frequency PWM control and integrated 0.25 Ω DMOS power switch. It targets industrial power rails, battery-powered systems, and distributed supply regulation where high efficiency (>90%) and minimal external component count are critical.
For engineers reviewing the LM2671N-5.0/NOPB datasheet, LM2671N-5.0/NOPB pinout, LM2671N-5.0/NOPB application, or LM2671N-5.0/NOPB equivalent, key selection criteria include verified 500-mA load capability, ±1.5% output voltage tolerance over line/load/temperature, 260-kHz oscillator stability, soft-start control via external capacitor, and TTL-compatible ON/OFF shutdown with 50-μA standby current.
Technical Context
The LM2671N-5.0/NOPB implements a voltage-mode PWM controller with internal 260-kHz oscillator, fixed-frequency operation, and cycle-by-cycle current limiting. Its DMOS power switch features 0.25 Ω typical RDS(ON) at 25°C and integrates thermal shutdown and overcurrent protection.
It uses a two-stage feedback amplifier referenced to an internal 1.21-V bandgap, with FB pin directly connected to output for fixed 5-V regulation. Soft-start is implemented via external capacitor on SS pin, and synchronization is supported via TTL/CMOS-compatible SYNC input accepting 400-kHz external clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V, ±1.5% tolerance over full line (6.5–40 V), load (20–500 mA), and temperature (–40 to +125°C) range - ensures stable rail for logic and analog circuitry without trimming. |
| Max Output Current | 500 mA continuous - supports mid-power subsystems like microcontrollers, sensors, and interface ICs without external boost stages. |
| Switching Frequency | 260 kHz (±10%), fixed internal oscillator - enables use of compact, low-ESR inductors and capacitors while avoiding AM radio band interference. |
| Efficiency | 90% typical at VIN = 12 V, IOUT = 500 mA - reduces thermal stress and eliminates need for heatsinks on PCB copper traces. |
| Quiescent Current | 3.6 mA typical in active mode; 50 μA in shutdown - extends battery life in always-on or low-duty-cycle applications. |
| Input Voltage Range | 6.5 V to 40 V - accommodates wide-input industrial supplies, automotive batteries (with transient protection), and unregulated AC/DC adapters. |
| Switch RDS(ON) | 0.25 Ω typical at 25°C - minimizes conduction loss and improves light-load efficiency versus higher-RDS(ON) alternatives. |
Pinout & Package
LM2671N-5.0/NOPB is supplied in an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size and through-hole mounting. Thermal performance is characterized by RθJA = 95°C/W under standard 1-in² copper conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | 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 | Accepts external capacitor to linearly ramp output voltage during startup, preventing inrush current and overshoot. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts TTL/CMOS clock ≥260 kHz to align switching frequency across multiple regulators or avoid EMI-sensitive bands. |
| FB (Pin 4) | Feedback sense input | Internally tied to 5-V output divider; direct connection to output ensures precise regulation without external resistors. |
| ON/OFF (Pin 5) | Enable/disable control | TTL-compatible input: <0.8 V = shutdown (50 μA IQ); >1.4 V = active; internal 20-μA pull-up allows floating for always-on operation. |
| VSW (Pin 8) | Switch node output | Drives external inductor and Schottky diode; swings between VIN and ~–0.4 V (diode drop) - requires short, low-inductance layout. |
| GND (Pin 6) | Power ground | Primary return path for input/output capacitors and switch current; must connect to low-impedance system ground plane. |
| VIN (Pin 7) | Input supply | Accepts 6.5–40 V DC; requires local high-frequency bypass capacitor (e.g., 22-μF tantalum) placed adjacent to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25 Ω RDS(ON) enables 500-mA output without external MOSFET, reducing BOM count and layout complexity. |
| Fixed 260-kHz switching | Eliminates external timing components and ensures predictable EMI profile for certified industrial designs. |
| Internal frequency compensation | Enables stable operation with only 5 external components (inductor, diode, input/output caps, bootstrap cap), no loop tuning required. |
| TTL shutdown with ultra-low IQ | 50-μA standby current allows battery-backed systems to maintain >1-year shelf life without significant drain. |
| Thermal shutdown & current limit | Protects against sustained overload or ambient overheating without external sensing circuitry - self-recovering after fault removal. |
Applications
| Industrial Power Supply | Automotive Aftermarket Electronics |
|---|---|
|
Use Scenario: Regulating 24-V vehicle battery down to stable 5-V rail for infotainment head units and CAN gateway modules. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled 5-V supply with thermal resilience across –40°C to +105°C ambient. Use Value: 90% efficiency at 500 mA reduces heat buildup in sealed enclosures; 40-V max input withstands load-dump transients up to 36 V. |
Use Scenario: Powering USB charging ports and LED lighting controllers in 12-V automotive accessory modules. IC Role / Device Role / Timing Role: Compact, through-hole-mounted DC-DC stage converting unregulated alternator output to clean 5-V USB-compliant power. Use Value: PDIP package simplifies manual assembly and rework; soft-start prevents inrush-triggered fuse blowing during cold cranking. |
| Programmable Logic Controller (PLC) I/O Module | Industrial Sensor Transmitter |
|
Use Scenario: Generating localized 5-V supply for digital isolators and RS-485 transceivers within modular PLC backplanes. IC Role / Device Role / Timing Role: Point-of-load regulator ensuring noise-immune 5-V rail independent of main 24-V bus fluctuations. Use Value: Fixed 5-V output eliminates resistor-divider calibration; ±1.5% tolerance guarantees reliable logic-level compatibility across temperature. |
Use Scenario: Powering 4–20 mA transmitter circuits and precision ADCs in hazardous-area pressure/temperature sensors. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency buck stage enabling loop-powered operation with margin for signal conditioning. Use Value: 3.6-mA active IQ leaves ample headroom in 4–20 mA loop budget; 6.5-V min input supports brownout operation down to depleted 7-V batteries. |
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-5.0/NOPB | Same electrical specs, but in 8-pin SOIC package (4.90 mm × 3.91 mm) - smaller footprint, surface-mount only, 105°C/W RθJA. | Better suited for space-constrained PCBs and automated SMT assembly; less suitable for prototyping or high-vibration environments. | Select LM2671M-5.0/NOPB when board area is limited and thermal management via PCB copper is feasible. |
| LM2575HVS-5.0 | 5-A version with 52-kHz switching, higher RDS(ON) (220 mΩ), wider input (4–60 V), but lower efficiency (~75% at 500 mA). | Targets higher-current loads and ultra-wide input ranges; trades efficiency and EMI for ruggedness and simplicity. | Choose LM2575HVS-5.0 only if input exceeds 40 V or peak load exceeds 500 mA - not a drop-in replacement. |
Compared with LM2671M-5.0/NOPB, the LM2671N-5.0/NOPB offers easier hand-soldering and superior thermal dissipation in through-hole layouts, while LM2575HVS-5.0 provides higher input voltage tolerance at the cost of reduced efficiency and increased output ripple.
Availability
LM2671N-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive aftermarket electronics, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term manufacturability, and through-hole assembly compatibility.
Supply support for LM2671N-5.0/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-power DC-DC applications where minimal external components and proven reliability are essential.
FAQ
What is the maximum input voltage rating for LM2671N-5.0/NOPB?
The absolute maximum input voltage for LM2671N-5.0/NOPB is 45 V, but the recommended operating range is 6.5 V to 40 V. Operation above 40 V risks exceeding safe junction temperature or triggering internal protection, and is not production-tested. For automotive load-dump scenarios, external clamping is advised to keep VIN ≤40 V.
Does LM2671N-5.0/NOPB require external feedback resistors?
No. LM2671N-5.0/NOPB is a fixed-output variant with internal resistor divider network tied to the FB pin. The FB pin must be connected directly to the output capacitor for proper regulation - no external resistors are needed or permitted for the 5-V version.
Can LM2671N-5.0/NOPB synchronize to an external clock?
Yes. The SYNC pin (Pin 3) accepts TTL- or CMOS-compatible square-wave signals from 260 kHz up to 400 kHz. When driven, the internal oscillator locks to the external clock edge, enabling EMI reduction and multi-regulator phase alignment - but disables current-limit frequency foldback during sync operation.
What thermal derating applies to LM2671N-5.0/NOPB at elevated ambient temperatures?
LM2671N-5.0/NOPB is rated for operation up to +125°C junction temperature. With RθJA = 95°C/W (PDIP, 1-in² copper), maximum continuous output current drops to ~350 mA at +70°C ambient. Derating curves are provided in Section 7.4 of the SNVS008L datasheet.
Is soft-start adjustable on LM2671N-5.0/NOPB, and how is it implemented?
Yes. Soft-start is implemented via an external capacitor on the SS pin (Pin 2). A 10-nF capacitor yields ~10-ms ramp time; larger values extend ramp duration linearly. Leaving SS open disables soft-start, causing immediate full output - acceptable only in low-inrush applications with adequately sized input capacitance.
LM2671N-5.0/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):
- 5V
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2671N-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671N-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2671N-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671N-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671N-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671N-5.0/NOPB?
LM2671N-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671N-5.0/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-5.0/NOPB?
For technical support, including LM2671N-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671N-5.0/NOPB requirements.
6.How does Aetrix verify that LM2671N-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671N-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671N-5.0/NOPB?
All LM2671N-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671N-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2671N-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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