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Texas Instruments LM2671LD-5.0/NOPB
- Part No.:
- LM2671LD-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2671LD-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,194
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Product details
Overview
LM2671LD-5.0/NOPB 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 (>90%) primary or preregulator in industrial power supplies and embedded systems.
For engineers reviewing the LM2671LD-5.0/NOPB datasheet, LM2671LD-5.0/NOPB pinout, LM2671LD-5.0/NOPB application, or LM2671LD-5.0/NOPB equivalent, key selection considerations include its SOIC-8 package compatibility, TTL-compatible ON/OFF control, soft-start timing via external capacitor, thermal shutdown protection, and fixed 5-V output eliminating feedback resistor network design effort.
Technical Context
The LM2671LD-5.0/NOPB integrates a DMOS power MOSFET switch, PWM controller with internal 260-kHz oscillator, error amplifier, soft-start circuit, and thermal/current-limit protection. Its fixed-output architecture uses internal feedback resistors-no external divider required-enabling direct FB-to-VOUT connection for stable regulation.
It operates in continuous conduction mode (CCM) with duty cycle determined by VIN/VOUT ratio, supports external frequency synchronization above 260 kHz, and implements cycle-by-cycle current limiting with foldback under short-circuit conditions. The CB-to-VSW bootstrap network ensures full gate drive for low RDS(ON) conduction loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over −40°C to +125°C, 6.5–40 V input, 20 mA–500 mA load - enables direct replacement of linear regulators without trimming. |
| Switching Frequency | 260 kHz (±10%) - allows use of compact, standard off-the-shelf inductors and reduces EMI filtering complexity vs lower-frequency buck converters. |
| Efficiency | 90% typical at VIN = 12 V, IOUT = 500 mA - minimizes thermal dissipation; PCB copper traces suffice as heatsink. |
| Power Switch RDS(ON) | 0.25 Ω (typ) at TJ = 25°C - reduces conduction loss and improves full-load efficiency vs higher-RDS(ON) alternatives. |
| Quiescent Current | 3.6 mA (typ) active mode; 50 μA (typ) standby - supports low-power system states without auxiliary LDOs. |
| Current Limit | 0.62–1.2 A (over temperature) - provides robust short-circuit protection while sustaining 500-mA continuous output. |
| Shutdown Threshold | ON/OFF pin < 0.8 V disables regulator; >1.4 V enables - compatible with 3.3-V and 5-V logic-level control signals. |
Pinout & Package
LM2671LD-5.0/NOPB is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), optimized for thermal performance with exposed pad not present - GND pins (6 and 7) provide primary thermal path through PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor node | Connects 100-nF ceramic cap to VSW to generate gate drive voltage > VIN for full enhancement of internal DMOS switch. |
| SS (Pin 2) | Soft-start control | Capacitor to GND sets output voltage ramp time; floating disables soft-start - prevents inrush current during power-up. |
| SYNC (Pin 3) | Frequency synchronization input | TTL/CMOS-compatible input; open-circuit defaults to 260-kHz internal oscillator - enables EMI reduction via clock dithering or system-level sync. |
| FB (Pin 4) | Feedback sense | Internally tied to 5-V output; direct connection to VOUT completes regulation loop - eliminates external resistor network and associated drift/error. |
| ON/OFF (Pin 5) | Enable/disable control | Logic-level input: <0.8 V = shutdown (50 μA IQ); >1.4 V = active - supports microcontroller GPIO or power sequencer control. |
| VSW (Pin 8) | Switch node | Drain of internal DMOS FET; connects to inductor and Schottky diode cathode - high dv/dt node requiring tight layout and ground plane. |
| GND (Pins 6, 7) | Power ground | Dual GND pins reduce impedance; connect directly to low-inductance PCB ground plane - critical for noise immunity and thermal conduction. |
| VIN (Pin 7) | Input supply | Accepts 6.5–40 V DC; requires local 22-μF tantalum bypass capacitor - powers internal circuitry and DMOS switch. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25-Ω RDS(ON) enables 500-mA output without external MOSFET or heat sink - simplifies BOM and layout. |
| Fixed 5-V output with internal feedback | Eliminates external resistor divider, reducing component count, board space, and output voltage drift from resistor tolerance/temperature. |
| 260-kHz fixed-frequency PWM | Enables predictable EMI spectrum and use of small, low-cost inductors (e.g., 68 µH) - avoids variable-frequency instability in sensitive analog circuits. |
| TTL-compatible ON/OFF control | 50-μA standby current and 0.8-V/1.4-V thresholds allow direct interfacing with 3.3-V or 5-V microcontrollers - no level-shifting required. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external circuitry - ensures reliability in unventilated enclosures. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Providing stable 5-V rail for microcontrollers, CAN transceivers, and sensor interfaces in programmable logic controllers operating from 12–24 V battery or bus supplies. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24-V industrial bus to clean 5-V logic supply with ripple < 50 mVpp. Use Value: 90% efficiency minimizes heat rise in sealed enclosures; ±1.5% output tolerance ensures reliable ADC reference and digital logic operation across temperature. |
Use Scenario: Generating 5-V supply for body control unit (BCU) modules in 12-V automotive systems, including door locks, lighting, and HVAC controls. IC Role / Device Role / Timing Role: High-reliability DC-DC converter handling cold-crank (6.5 V) and load-dump (40 V) transients per ISO 7637-2. Use Value: Wide 6.5–40 V input range accommodates automotive battery fluctuations; thermal shutdown prevents latch-up during under-hood temperature excursions. |
| Point-of-Load for FPGA I/O Banks | Medical Diagnostic Instrumentation |
|
Use Scenario: Local 5-V supply for FPGA I/O banks in test equipment where low-noise, fast transient response is required alongside main 3.3-V core rail. IC Role / Device Role / Timing Role: Secondary buck regulator with soft-start (via SS pin) preventing inrush into large FPGA I/O capacitance during power-up sequencing. Use Value: Soft-start capacitor programmability enables controlled ramp rate (< 10 ms); 260-kHz switching avoids interference with high-speed digital clocks. |
Use Scenario: Powering isolated analog front-ends and low-noise signal processors in portable ultrasound or patient monitoring devices using 12–24 V medical-grade adapters. IC Role / Device Role / Timing Role: Low-quiescent, low-EMI 5-V source meeting IEC 60601-1 leakage and conducted emission requirements. Use Value: 50-μA standby current extends battery life; fixed-frequency operation simplifies EMI filter design to meet Class B limits. |
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 SOIC-8 package and 5-V fixed output, but rated for 1-A output current and includes integrated catch diode - higher RDS(ON) (0.35 Ω) and lower efficiency at 500 mA. | Better suited for higher-current loads (>700 mA); less optimal for thermally constrained 500-mA designs due to higher conduction loss. | Select LM2672MX-5.0/NOPB only if future load growth to 1 A is anticipated; LM2671LD-5.0/NOPB offers superior efficiency at 500 mA. |
| TPS54202DR | 2-A synchronous buck regulator in SOIC-8; 4.5–28 V input; adjustable output; 500-kHz switching; integrated high/low-side FETs - no external diode needed, but requires feedback resistors. | Requires external feedback network and compensation; higher switching frequency increases EMI filtering demands but enables smaller magnetics. | Choose TPS54202DR for designs needing scalability beyond 500 mA or synchronous efficiency gains; LM2671LD-5.0/NOPB delivers simpler, proven 5-V solution with zero external feedback components. |
Compared with LM2672MX-5.0/NOPB and TPS54202DR, the LM2671LD-5.0/NOPB provides the most straightforward 5-V/500-mA implementation - fixed output eliminates resistor selection errors, 260-kHz frequency balances size and EMI, and its mature SIMPLE SWITCHER® architecture ensures design confidence in cost-sensitive industrial applications.
Availability
LM2671LD-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2671LD-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 non-isolated DC-DC buck applications where minimal external components, predictable performance, and rugged operation are prioritized over ultra-high density or advanced digital control.
FAQ
What is the maximum input voltage rating for the LM2671LD-5.0/NOPB?
The LM2671LD-5.0/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 6.5 V to 40 V. Operation above 40 V risks exceeding safe junction temperature or triggering internal protection circuits, and is not supported per TI's datasheet specifications. Always include input transient suppression for automotive or industrial environments.
Does the LM2671LD-5.0/NOPB require external feedback resistors to set the 5-V output?
No - the LM2671LD-5.0/NOPB is a fixed-output variant with internal feedback resistors calibrated for 5.0 V ±1.5%. The FB pin (Pin 4) must be connected directly to the output capacitor; adding external resistors will disrupt regulation and cause output voltage error. This distinguishes it from the adjustable LM2671MX-ADJ version.
Can the LM2671LD-5.0/NOPB synchronize to an external clock signal?
Yes - the SYNC pin (Pin 3) accepts TTL/CMOS-compatible external clock signals above 260 kHz (up to 400 kHz). When driven, it overrides the internal 260-kHz oscillator and aligns switching edges to the external clock, enabling EMI reduction and system-level timing coordination. Leaving SYNC open defaults to internal operation.
What thermal considerations apply to the LM2671LD-5.0/NOPB in SOIC-8 package?
The LM2671LD-5.0/NOPB in SOIC-8 (D package) has a junction-to-ambient thermal resistance (RθJA) of 105°C/W with standard 1-inch² PCB copper. To maintain TJ ≤ 125°C at 500 mA, keep ambient temperature below 75°C or increase copper area. GND pins (6 and 7) must connect to a low-impedance ground plane - no thermal pad is present in this package variant.
How does the soft-start function work on the LM2671LD-5.0/NOPB?
The LM2671LD-5.0/NOPB implements soft-start via an internal 4.5-μA current source charging an external capacitor on the SS pin (Pin 2). The resulting voltage ramp controls PWM duty cycle startup, limiting inrush current. A 100-nF capacitor yields ~22-ms ramp; floating SS disables soft-start entirely. This protects input capacitors and downstream circuitry during power-up.
LM2671LD-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 16-WSON (5x5)
LM2671LD-5.0/NOPB FAQ
1.How can I place an order for LM2671LD-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671LD-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 LM2671LD-5.0/NOPB reliable?
The price and inventory of LM2671LD-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 LM2671LD-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671LD-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671LD-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671LD-5.0/NOPB?
LM2671LD-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671LD-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 LM2671LD-5.0/NOPB?
For technical support, including LM2671LD-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671LD-5.0/NOPB requirements.
6.How does Aetrix verify that LM2671LD-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671LD-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 LM2671LD-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671LD-5.0/NOPB?
All LM2671LD-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671LD-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 LM2671LD-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2671LD-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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