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Texas Instruments LM2671M-5.0
- Part No.:
- LM2671M-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671M-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
LM2671M-5.0 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering 5 V at up to 500 mA output current, featuring 260-kHz fixed-frequency operation, ±1.5% output voltage tolerance over line/load/temperature, 0.25-Ω DMOS power switch, and wide 6.5–40 V input range. It serves as a high-efficiency primary or preregulator in industrial power supplies and embedded systems requiring stable 5-V rail generation.
For engineers reviewing the LM2671M-5.0 datasheet, LM2671M-5.0 pinout, LM2671M-5.0 application, or LM2671M-5.0 equivalent, key selection criteria include verified 500-mA load capability, thermal shutdown and cycle-by-cycle current limiting, soft-start control via external capacitor, TTL-compatible ON/OFF enable, and synchronization input for EMI-sensitive designs.
Technical Context
The LM2671M-5.0 integrates a DMOS power MOSFET switch, PWM controller with internal 260-kHz oscillator, error amplifier, and protection circuitry into a single SOIC-8 package. Its fixed-output architecture eliminates external feedback resistors - the FB pin connects directly to VOUT for regulation.
Operation relies on bootstrap-driven high-side gate drive (CB-to-VSW), synchronous rectification via external Schottky diode, and duty-cycle modulation proportional to VOUT/VIN. Shutdown mode reduces quiescent current to 50 μA, while soft-start limits inrush via external capacitor on SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over full temperature and load range - ensures stable logic supply without trimming. |
| Max Output Current | 500 mA continuous - supports microcontroller cores, sensors, and interface ICs without external boost stages. |
| Input Voltage Range | 6.5 V to 40 V - accommodates 12-V and 24-V industrial buses, automotive battery transients, and unregulated AC/DC outputs. |
| Switching Frequency | 260 kHz (±10%) - enables compact LC filter design with standard off-the-shelf inductors and low-ESR capacitors. |
| Efficiency | 90% at VIN = 12 V, IOUT = 500 mA - minimizes thermal stress; PCB copper traces suffice as heatsink. |
| Quiescent Current | 3.6 mA typical in active mode; 50 μA in shutdown - extends battery life in standby applications. |
| ON/OFF Threshold | 1.4 V (typical) - compatible with 3.3-V and 5-V logic-level control signals without level shifting. |
Pinout & Package
LM2671M-5.0 is supplied 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.
| 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 DMOS enhancement. |
| SS (Pin 2) | Soft-start control input | External capacitor sets output voltage ramp time; floating disables soft-start. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts external TTL/CMOS clock >260 kHz to align switching frequency for EMI reduction or multi-rail coordination. |
| FB (Pin 4) | Feedback sense input | Internally tied to 5-V reference; connect directly to output capacitor for fixed 5-V regulation - no resistor divider needed. |
| ON/OFF (Pin 5) | Enable/disable control | Logic-high (>1.4 V) enables regulator; ≤0.8 V forces shutdown with 50-μA standby current. |
| VSW (Pin 8) | Switch node output | Drives external Schottky diode cathode and inductor; swings between VIN and ~−0.4 V during switching. |
| GND (Pin 6) | Power ground | Primary return path for input/output capacitors and inductor; requires short, low-inductance PCB trace. |
| VIN (Pin 7) | Input supply | Accepts 6.5–40 V; must be bypassed with low-ESR capacitor placed adjacent to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25-Ω RDS(ON) at 25°C - reduces conduction loss and improves efficiency above 85% across 100–500 mA loads. |
| Internal frequency compensation | Patented compensation eliminates need for external compensation network - simplifies design and improves stability margin. |
| Thermal shutdown + current limit | Combined protection triggers at junction temperature >150°C and peak switch current >0.62 A - prevents damage under overload or short-circuit. |
| Soft-start with external capacitor | Adjustable startup time avoids input inrush and output overshoot - critical for powering sensitive downstream logic. |
| TTL-compatible enable input | ON/OFF pin accepts standard logic levels and includes internal 20-μA pull-up - enables direct MCU GPIO control without external biasing. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated CAN transceivers, analog sensor front-ends, and digital I/O drivers from a 24-V vehicle or factory bus. IC Role / Device Role / Timing Role: Primary 5-V buck regulator providing clean, regulated rail for mixed-signal subsystems with transient immunity. Use Value: 40-V max input withstands load-dump events; 90% efficiency minimizes heat in sealed enclosures; SYNC input allows noise spectrum alignment with CAN bit timing. |
Use Scenario: Generating 5-V supply for microcontroller, EEPROM, and LED drivers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC converter replacing linear regulators to meet automotive thermal and efficiency targets. Use Value: 500-mA output supports multiple peripherals; 50-μA shutdown current extends battery life during sleep mode; SOIC-8 footprint fits space-constrained PCB layouts. |
| Point-of-Load Converter for FPGA Core | Medical Diagnostic Sensor Interface |
|
Use Scenario: Delivering tightly regulated 5-V auxiliary power to FPGA configuration circuitry and I/O banks in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secondary buck regulator stepping down from intermediate 12-V rail with fast transient response and low output ripple. Use Value: ±1.5% output tolerance ensures reliable FPGA boot and configuration; soft-start prevents brownout during power-up; CB/VSW bootstrap enables high-side switch efficiency. |
Use Scenario: Powering precision analog front-end ICs (ADCs, op-amps, reference buffers) in handheld ultrasound or ECG units. IC Role / Device Role / Timing Role: Low-noise, well-regulated 5-V source with minimal conducted EMI due to fixed 260-kHz frequency and SYNC capability. Use Value: 260-kHz switching allows effective filtering with small ferrite beads and ceramic caps; FB pin direct connection eliminates resistor-divider drift errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672M-5.0 | Same pinout, identical electrical specs, but rated for extended temperature range (–40°C to +125°C vs. –40°C to +125°C - same); minor process revision with improved ESD robustness (HBM ±2000 V). | No functional difference in standard industrial use; preferred for automotive under-hood or high-reliability deployments requiring tighter AEC-Q100 alignment. | Select LM2672M-5.0 when extended qualification or enhanced ESD margin is required; otherwise LM2671M-5.0 remains fully suitable. |
| TPS54202DR | 2-A output, 4.5–28-V input, 500-kHz switching, integrated FETs, but requires external feedback resistors and lacks SYNC input. | Higher current capacity and smaller solution size, but lacks frequency synchronization and fixed 5-V option - demands redesign of feedback and layout. | Choose TPS54202DR only when >500 mA is needed or board area is severely constrained; LM2671M-5.0 offers simpler BOM and proven 5-V stability. |
Compared with LM2672M-5.0, the LM2671M-5.0 provides identical performance in standard environments at lower cost, while TPS54202DR trades simplicity and synchronization capability for higher current density - making LM2671M-5.0 optimal for cost-sensitive, noise-controlled, fixed-rail applications.
Availability
LM2671M-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2671M-5.0 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 power supply applications.
FAQ
What is the maximum input voltage rating for LM2671M-5.0?
The LM2671M-5.0 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 6.5 V to 40 V. Operation within this 6.5–40 V window ensures guaranteed 500-mA output, ±1.5% regulation, and thermal stability per TI SNVS008L datasheet specifications. Exceeding 40 V may trigger internal protection but is not recommended for sustained operation.
Does LM2671M-5.0 require external feedback resistors to set its output voltage?
No. The LM2671M-5.0 is a fixed-output variant: its internal feedback divider is factory-trimmed for 5.0 V, so the FB pin must be connected directly to the output capacitor. Unlike the adjustable LM2671MX-ADJ version, no external resistors are needed - eliminating drift, layout sensitivity, and BOM cost associated with resistor networks.
Can LM2671M-5.0 synchronize to an external clock signal?
Yes. The LM2671M-5.0 includes a dedicated SYNC pin (Pin 3) that accepts TTL- or CMOS-compatible external clocks above 260 kHz. When driven, it overrides the internal 260-kHz oscillator and locks switching frequency to the external source - enabling EMI reduction, multi-rail phase alignment, and spectral placement control in noise-sensitive systems.
What thermal management is required for LM2671M-5.0 at full 500-mA load?
At 500-mA output and 12-V input, LM2671M-5.0 operates at ~90% efficiency, dissipating ~550 mW. With its SOIC-8 package (RθJA = 105°C/W), a 1-inch² copper pour is sufficient for <30°C rise above ambient - no heatsink or forced air is required. Thermal shutdown activates at 150°C junction temperature, providing fault protection.
How does the soft-start function work on LM2671M-5.0?
The LM2671M-5.0 implements soft-start via an external capacitor on the SS pin (Pin 2). Charging this capacitor through an internal 4.5-μA current source controls the ramp rate of the output voltage, preventing inrush current and overshoot. A 100-nF capacitor yields ~22-ms startup; leaving SS open disables soft-start entirely.
LM2671M-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2671M-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671M-5.0 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 reliable?
The price and inventory of LM2671M-5.0 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 is usually 5 days.
3.What payment methods are accepted for LM2671M-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671M-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671M-5.0?
LM2671M-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671M-5.0 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?
For technical support, including LM2671M-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671M-5.0 requirements.
6.How does Aetrix verify that LM2671M-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2671M-5.0 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 meets industry standards.
7.What is the process for return or replacement of LM2671M-5.0?
All LM2671M-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2671M-5.0, 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 part is unused and in its original packaging.
Return procedure for LM2671M-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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