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Texas Instruments LM2671M-5.0/NOPB
- Part No.:
- LM2671M-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671M-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,267
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Product details
Overview
LM2671M-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering 5 V at up to 500 mA output current, with ±1.5% output voltage tolerance, 260 kHz fixed-frequency operation, and 90% efficiency at 12 V input/500 mA load. It integrates a 0.25 Ω DMOS power switch and supports TTL shutdown for low-power standby in industrial power supplies.
For engineers reviewing the LM2671M-5.0/NOPB datasheet, LM2671M-5.0/NOPB pinout, LM2671M-5.0/NOPB application, or LM2671M-5.0/NOPB equivalent, key selection criteria include input voltage range (6.5–40 V), thermal shutdown protection, soft-start control, frequency synchronization capability, and SOIC-8 package compatibility with standard PCB layouts.
Technical Context
The LM2671M-5.0/NOPB implements a fixed-frequency PWM controller with internal 260 kHz oscillator driving an integrated high-side DMOS FET. Its feedback loop uses a direct connection from FB pin to output (no external divider), enabling stable 5 V regulation across line and load variations.
It features synchronous shutdown via ON/OFF pin (1.4 V threshold), soft-start controlled by external capacitor on SS pin, and SYNC pin for external clock injection above 260 kHz. Protection includes cycle-by-cycle current limiting (0.62–1.2 A), thermal shutdown, and built-in frequency foldback under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over full temperature and load range - ensures stable rail for microcontrollers and analog circuitry without external resistors. |
| Max Output Current | 500 mA continuous - sufficient for powering FPGA I/O banks, sensor interfaces, or small embedded systems without external current boosting. |
| Input Voltage Range | 6.5 V to 40 V - supports wide-input industrial, automotive, and telecom power buses including 12 V, 24 V, and 36 V nominal systems. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact, low-cost inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 90% at VIN = 12 V, IOUT = 500 mA - minimizes thermal dissipation; PCB copper traces serve as sole heatsink per design guidance. |
| Quiescent Current | 3.6 mA typical operating, 50 μA standby - supports low-power modes in battery-backed or energy-conscious applications. |
| ON/OFF Threshold | 1.4 V (min), 2.0 V (typ) - compatible with standard logic-level GPIOs for system-level enable/disable control. |
Pinout & Package
LM2671M-5.0/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Thermal resistance RθJA = 105°C/W with standard 1-inch² PCB copper area.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor terminal | Connects 100 nF ceramic capacitor to VSW to generate gate drive voltage > VIN for full enhancement of internal DMOS switch. |
| SS | Soft-start control input | External capacitor to GND sets output voltage ramp time; floating disables soft-start for immediate startup. |
| SYNC | Frequency synchronization input | Accepts external TTL/CMOS clock >260 kHz to align switching frequency; open-circuit defaults to internal 260 kHz oscillator. |
| FB | Feedback sense input | Internally connected to 5 V reference; wired directly to output for fixed 5 V regulation - no external resistor network required. |
| ON/OFF | Enable/disable control input | Logic-high (>1.4 V) enables regulation; ≤0.8 V forces shutdown with 50 μA supply current - supports system-level power sequencing. |
| VSW | Switch node output | Drives external Schottky diode and inductor; swings from VIN (switch ON) to ~−0.4 V (diode drop) during OFF phase. |
| GND | Power ground | Common return for input/output capacitors and internal circuitry; requires short, low-inductance path to CIN and COUT. |
| VIN | Input supply | Accepts 6.5–40 V DC; powers internal bias circuitry and high-side switch; must be bypassed with local ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25 Ω DMOS switch | Reduces conduction losses and eliminates need for external MOSFET, simplifying layout and improving efficiency at 500 mA. |
| Fixed 5 V output with internal feedback | Eliminates external resistor divider, reducing BOM count and eliminating trimming errors - ideal for cost-sensitive, high-volume designs. |
| TTL-compatible ON/OFF control | Enables seamless integration with microcontroller GPIOs or system supervisors for dynamic power management without level-shifting. |
| 260 kHz fixed-frequency PWM | Provides predictable EMI profile and allows use of standardized, off-the-shelf inductors - avoids variable-frequency noise spread issues. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external sensing components - enhances reliability in unattended systems. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V vehicle battery to regulated 5 V for MCU, CAN transceivers, and sensors. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, efficient 5 V rail with thermal protection in confined under-hood space. Use Value: 90% efficiency minimizes heat buildup; 40 V max input accommodates load-dump transients; ON/OFF pin enables sleep-mode current reduction. |
Use Scenario: Generating 5 V from 12 V battery for door module microcontrollers and LED drivers. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter with soft-start to prevent inrush into downstream capacitive loads. Use Value: SOIC-8 footprint fits tight PCB real estate; ±1.5% output tolerance ensures reliable digital logic operation across temperature. |
| Point-of-Load Converter | Legacy Equipment Retrofit |
|
Use Scenario: Replacing linear regulators in aging test equipment to reduce heat and improve efficiency. IC Role / Device Role / Timing Role: Drop-in buck replacement for 7805-style circuits, requiring only minimal external component changes. Use Value: 500 mA output sustains legacy 5 V loads; 6.5 V min input allows operation down to weak battery or degraded supply conditions. |
Use Scenario: Upgrading obsolete discrete-switching supplies in factory automation controllers. IC Role / Device Role / Timing Role: Monolithic alternative to multi-component buck designs, reducing failure points and assembly cost. Use Value: Integrated current limit and thermal shutdown replace discrete protection circuits; SYNC pin enables EMI coordination with other system clocks. |
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-5.0/NOPB | Same architecture but WSON-16 package (5 mm × 5 mm); higher thermal performance (RθJA ≈ 60°C/W with proper layout). | Better suited for thermally constrained, high-density PCBs where SOIC-8 thermal limits may be exceeded. | Select LM2672MX-5.0/NOPB when board space is limited and thermal headroom is critical; requires rework of layout and soldering process. |
| TPS5430DDAR | 3 A output capability, 500 kHz switching, adjustable output; no fixed 5 V version - requires external feedback resistors. | Supports higher-current loads and flexible voltage scaling, but adds BOM complexity and layout sensitivity. | Choose TPS5430DDAR when future-proofing for >500 mA loads or needing programmable output; not a direct functional replacement. |
Compared with LM2671M-5.0/NOPB, LM2672MX-5.0/NOPB offers superior thermal handling in compact form, while TPS5430DDAR trades simplicity for scalability - neither is pin-compatible, but both address adjacent design requirements where fixed 5 V, 500 mA, and SOIC-8 are non-negotiable.
Availability
LM2671M-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and point-of-load converters requiring stable component supply, long-term lifecycle support, and TI-qualified manufacturing traceability.
Supply support for LM2671M-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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2671 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and robust performance in cost-sensitive industrial and automotive DC-DC applications.
FAQ
What is the maximum input voltage rating for LM2671M-5.0/NOPB?
The absolute maximum input voltage for LM2671M-5.0/NOPB is 45 V, but the recommended operating range is 6.5 V to 40 V. Operation at 40 V is supported across the full temperature range (–40°C to +125°C junction), making it suitable for 24 V industrial systems with transient overvoltage margins. Exceeding 40 V continuously risks violating recommended conditions and may impact long-term reliability.
Does LM2671M-5.0/NOPB require external feedback resistors to set its 5 V output?
No, LM2671M-5.0/NOPB does not require external feedback resistors. It is a fixed-output variant with internal feedback network calibrated for 5.0 V ±1.5%. The FB pin is internally connected to the 5 V reference and must be wired directly to the output capacitor for regulation - eliminating resistor tolerance errors and reducing component count.
Can LM2671M-5.0/NOPB synchronize to an external clock signal?
Yes, LM2671M-5.0/NOPB supports external frequency synchronization via the SYNC pin. An external TTL- or CMOS-compatible clock signal (0–>3 V+, >260 kHz) can be ac-coupled to SYNC using a 100 pF capacitor and 1 kΩ pull-down. This forces the internal oscillator to lock to the external frequency, enabling EMI control and system-level clock alignment - though current-limit foldback is disabled during sync mode.
What thermal considerations apply to LM2671M-5.0/NOPB in SOIC-8 package?
LM2671M-5.0/NOPB in SOIC-8 has RθJA = 105°C/W with 1 inch² of PCB copper. At 500 mA output and 12 V input, typical power dissipation is ~500 mW, resulting in ~53°C rise above ambient - well within the 125°C max junction limit. For sustained high-temperature operation, TI recommends maximizing copper area around GND and VIN pins and avoiding thermal isolation of the package body.
Is LM2671M-5.0/NOPB RoHS-compliant and lead-free?
Yes, LM2671M-5.0/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per TI's product marking convention. It meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) and is qualified for Pb-free reflow soldering profiles up to 260°C peak temperature.
LM2671M-5.0/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):
- 5V
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2671M-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671M-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 LM2671M-5.0/NOPB reliable?
The price and inventory of LM2671M-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 LM2671M-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671M-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671M-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671M-5.0/NOPB?
LM2671M-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671M-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 LM2671M-5.0/NOPB?
For technical support, including LM2671M-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671M-5.0/NOPB requirements.
6.How does Aetrix verify that LM2671M-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671M-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 LM2671M-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671M-5.0/NOPB?
All LM2671M-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671M-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 LM2671M-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2671M-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2671M-5.0/NOPB Tags
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