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Texas Instruments LM2671MX-5.0
- Part No.:
- LM2671MX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671MX-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,936
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Product details
Overview
LM2671MX-5.0 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering a fixed 5.0 V output at up to 500 mA, 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 compact, low-component-count 5 V conversion.
For engineers reviewing the LM2671MX-5.0 datasheet, LM2671MX-5.0 pinout, LM2671MX-5.0 application, or LM2671MX-5.0 equivalent, key selection considerations include its guaranteed 500-mA load capability, integrated soft-start and shutdown control, thermal/current protection, SOIC-8 package compatibility, and design simplicity requiring only five external components.
Technical Context
The LM2671MX-5.0 implements a current-mode PWM controller with an internal 260 kHz oscillator driving a single DMOS high-side power switch. Its feedback loop uses a direct connection from FB to VOUT for fixed-output versions, eliminating external resistors and enabling stable regulation without compensation components.
It operates in active mode when ON/OFF ≥ 1.4 V and enters low-power shutdown (<100 μA standby) when ON/OFF < 0.8 V. The CB–VSW bootstrap network ensures full gate drive for the 0.25 Ω RDS(ON) switch, while SYNC allows external clock synchronization above 260 kHz - disabling frequency foldback during sync operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V, ±1.5% tolerance across 6.5–40 V input and 20 mA–500 mA load ensures stable logic supply without trimming. |
| Max Output Current | 500 mA continuous, ensured by internal current limit (0.62–1.2 A typical) and thermal shutdown for reliable operation. |
| Switching Frequency | 260 kHz fixed (±10%), enabling use of small, standard inductors and reducing EMI compared to lower-frequency alternatives. |
| Input Voltage Range | 6.5 V to 40 V, supporting wide-input industrial, automotive, and telecom applications without pre-regulation. |
| Efficiency | Up to 90% at 12 VIN/500 mA, minimizing heat dissipation and allowing PCB copper traces as sole heatsink. |
| Quiescent Current | 3.6 mA typical operating IQ; 50 μA standby in shutdown, critical for battery-backed or low-power systems. |
| RDS(ON) | 0.25 Ω typical, reducing conduction loss and improving efficiency at high load currents. |
Pinout & Package
LM2671MX-5.0 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 under standard 1-in² copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor node | Connects 100 nF ceramic cap to VSW to generate gate drive > VIN for full enhancement of internal DMOS switch. |
| SS | Soft-start control | Capacitor to GND sets output voltage ramp time; floating disables soft-start for immediate turn-on. |
| SYNC | Frequency synchronization input | TTL/CMOS-compatible input; open-circuit enables internal 260 kHz oscillator; external clock >260 kHz forces switching frequency. |
| FB | Feedback sense input | Internally tied to 5 V output for fixed version - direct connection to VOUT enables regulation without external divider. |
| ON/OFF | Enable/disable control | High (>1.4 V) enables regulation; low (<0.8 V) shuts down IC with 50 μA standby current; internal 20 μA pull-up. |
| VSW | Switch node output | Drain of internal DMOS switch; connects to inductor and Schottky diode cathode - high dv/dt node requiring careful layout. |
| GND | Power ground | Common return for input/output capacitors and internal circuitry; requires short, low-inductance path to CIN. |
| VIN | Input supply | Accepts 6.5–40 V; powers internal circuitry and high-side switch; must be bypassed with local high-frequency capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25 Ω RDS(ON) enables high efficiency and eliminates need for external MOSFET driver or discrete switch. |
| Fixed-frequency PWM control | 260 kHz operation simplifies EMI filtering and allows use of smaller magnetics than 50–150 kHz alternatives. |
| Self-contained soft-start | Capacitor-programmable ramp prevents inrush current and stabilizes startup without external timing circuitry. |
| Thermal + current-limit protection | Automatic shutdown on junction temperature >150°C or cycle-by-cycle current limit >0.62 A ensures robust fault handling. |
| Low-component design | Only five external parts required (inductor, diode, CIN, COUT, CCB) - no compensation network or feedback resistors needed for 5 V version. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
|
Use Scenario: Providing isolated 5 V rail for microcontroller, CAN transceiver, and sensor interfaces in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V DC bus to clean, regulated 5 V for digital logic and communication peripherals. Use Value: High efficiency (>90%) minimizes heat buildup in enclosed enclosures; wide 6.5–40 V input accommodates 24 V nominal with load dump transients. |
Use Scenario: Generating 5 V supply for MCU, LIN transceivers, and LED drivers in vehicle door modules and seat controllers. IC Role / Device Role / Timing Role: Pre-regulator stepping down 12 V battery-derived input to stable 5 V before LDO post-regulation for noise-sensitive circuits. Use Value: 500 mA output supports multiple peripherals; shutdown control (ON/OFF pin) enables deep-sleep current reduction during vehicle off-state. |
| Point-of-Load Telecom Supply | Medical Diagnostic Equipment Auxiliary Rail |
|
Use Scenario: Local 5 V conversion for FPGA configuration, memory, and interface ICs in 48 V-powered telecom line cards. IC Role / Device Role / Timing Role: Efficient intermediate converter replacing linear regulators to reduce thermal load and improve system efficiency. Use Value: 260 kHz switching allows compact 68 µH inductor; ±1.5% output tolerance meets tight logic supply requirements without post-regulation. |
Use Scenario: Powering isolated analog front-end sensors and display controllers in portable ultrasound or patient monitors. IC Role / Device Role / Timing Role: Safety-isolated secondary-side buck regulator delivering medically compliant 5 V from isolated DC-DC stage. Use Value: Integrated protection (thermal shutdown, current limit) enhances reliability in life-critical systems; SOIC-8 package supports automated assembly. |
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 | Same pinout and function but rated for 1 A output; higher current limit (1.2–1.8 A) and lower RDS(ON) (0.18 Ω). | Used where future load growth or margin beyond 500 mA is required; same PCB layout compatible. | Select LM2672MX-5.0 if headroom for >500 mA loads or improved efficiency at high current is needed. |
| TPS5430DDAR | 3 A synchronous buck; 500 kHz switching; requires external MOSFETs; no integrated switch; different pinout and control architecture. | Higher efficiency and power density for space-constrained designs; lacks integrated soft-start and sync features of LM2671MX-5.0. | Choose TPS5430DDAR only when 3 A output or synchronous rectification is mandatory - not a drop-in replacement. |
Compared with LM2671MX-5.0, LM2672MX-5.0 offers higher current capacity with identical footprint and feature set, while TPS5430DDAR provides greater power and efficiency at the cost of design complexity, component count, and non-interchangeable layout.
Availability
LM2671MX-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical auxiliary power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2671MX-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 engineers needing easy-to-use, high-efficiency DC-DC buck regulators with minimal external components and robust protection features.
FAQ
What is the maximum input voltage rating for LM2671MX-5.0?
The absolute maximum input voltage for LM2671MX-5.0 is 45 V, but the recommended operating range is 6.5 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection or cause permanent damage. For sustained reliability, keep VIN ≤ 40 V per datasheet Section 7.1 and 7.3.
Does LM2671MX-5.0 require external feedback resistors?
No, LM2671MX-5.0 does not require external feedback resistors. As a fixed 5 V output variant, it internally connects the FB pin to the regulated output, eliminating the need for an external resistor divider. This simplifies layout, improves accuracy, and removes potential sources of drift or noise coupling - confirmed in Section 6 (Pin Functions) and Figure 15 of the SNVS008L datasheet.
Can LM2671MX-5.0 be synchronized to an external clock?
Yes, LM2671MX-5.0 supports external clock synchronization via the SYNC pin. When driven with a TTL/CMOS signal >260 kHz (up to 400 kHz), it locks its switching frequency to the external source. However, frequency foldback protection is disabled during sync operation, so short-circuit response relies solely on current limiting - detailed in Sections 8.3.5 and 9.2.1.2.3 of the datasheet.
What thermal derating applies to LM2671MX-5.0 in SOIC-8 package?
In the SOIC-8 (D) package, LM2671MX-5.0 has RθJA = 105°C/W with standard 1-in² copper. At 500 mA output and 12 V input, typical power dissipation is ~350 mW, resulting in ~37°C junction rise above ambient. Derating begins above 125°C junction temperature, with thermal shutdown activating at ~150°C - see Section 7.4 and Figure 13 for dropout and thermal curves.
Is LM2671MX-5.0 pin-compatible with other LM2671 fixed-output variants?
Yes, all LM2671 fixed-output versions (3.3 V, 5 V, 12 V) share identical SOIC-8, PDIP-8, and WSON-16 pinouts and electrical behavior - only the internal feedback reference differs. This allows board-level substitution between LM2671MX-3.3, LM2671MX-5.0, and LM2671MX-12 without layout changes, as verified in Section 6 (Pin Configuration) and Table 1 of the datasheet.
LM2671MX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM2671MX-5.0 FAQ
1.How can I place an order for LM2671MX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671MX-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 LM2671MX-5.0 reliable?
The price and inventory of LM2671MX-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 LM2671MX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2671MX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671MX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671MX-5.0?
LM2671MX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671MX-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 LM2671MX-5.0?
For technical support, including LM2671MX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671MX-5.0 requirements.
6.How does Aetrix verify that LM2671MX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2671MX-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 LM2671MX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2671MX-5.0?
All LM2671MX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2671MX-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 LM2671MX-5.0 part is unused and in its original packaging.
Return procedure for LM2671MX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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