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Texas Instruments LM2671MX-ADJ/NOPB
- Part No.:
- LM2671MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,293
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Product details
Overview
LM2671MX-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering up to 500 mA output current, operating from 6.5 V to 40 V input, with adjustable output voltage range of 1.21 V to 37 V, ±1.5% output voltage tolerance, and 260 kHz fixed-frequency PWM control - used in industrial power supplies and embedded system point-of-load conversion.
For engineers reviewing the LM2671MX-ADJ/NOPB datasheet, LM2671MX-ADJ/NOPB pinout, LM2671MX-ADJ/NOPB application, or LM2671MX-ADJ/NOPB equivalent, key selection criteria include its 0.25 Ω DMOS switch RDS(ON), soft-start capability via external capacitor, TTL-compatible ON/OFF control, SYNC frequency synchronization support, and thermal/current-limit protection for robust 500-mA load operation.
Technical Context
The LM2671MX-ADJ/NOPB integrates a DMOS high-side power switch, fixed 260 kHz oscillator, internal PWM controller, and feedback amplifier with 1.21 V reference. Its architecture uses external inductor-diode-capacitor energy storage and relies on resistor-divider feedback (via FB pin) to set output voltage precisely across line/load/temperature variations.
It supports active functional modes including normal regulation (ON/OFF ≥ 1.4 V), low-power shutdown (ON/OFF ≤ 0.8 V, ISTBY = 50 µA typ), and synchronized operation (external clock > 275 kHz applied to SYNC). Protection includes cycle-by-cycle current limiting (0.62–1.2 A), thermal shutdown, and soft-start ramp control via SS pin capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 500 mA guaranteed continuous load current - enables direct replacement of linear regulators in medium-power applications without heatsink. |
| Input voltage range | 6.5 V to 40 V - supports wide-range industrial inputs including 12 V, 24 V, and 36 V bus systems. |
| Output voltage range | 1.21 V to 37 V (adjustable) - set via external resistor divider on FB pin; 1.21 V reference enables low-voltage logic supply generation. |
| Switch RDS(ON) | 0.25 Ω (typ at 25°C) - minimizes conduction loss and improves efficiency especially at higher load currents. |
| Switching frequency | 260 kHz (±10%) - enables use of compact, standard off-the-shelf inductors and reduces EMI compared to lower-frequency alternatives. |
| Feedback voltage | 1.21 V (±1.5% over temp) - stable reference for precision output regulation independent of input or load variation. |
| Quiescent current | 3.6 mA (typ), 100 µA standby - ensures low no-load power draw in battery-backed or always-on systems. |
Pinout & Package
LM2671MX-ADJ/NOPB is packaged 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 | Bootstrap capacitor connection | Connects 100 nF ceramic capacitor to VSW to generate gate drive voltage > VIN for full MOSFET enhancement. |
| SS | Soft-start control | External capacitor to GND sets output voltage ramp time; floating disables soft-start. |
| SYNC | Frequency synchronization input | Accepts TTL/CMOS clock > 275 kHz to align switching frequency; open-circuit defaults to 260 kHz internal oscillator. |
| FB | Feedback sense input | Monitors voltage divider output; regulates VOUT by maintaining 1.21 V at this pin - defines output voltage in ADJ version. |
| ON/OFF | Enable/disable control | TTL-compatible input: ≥1.4 V enables regulation; ≤0.8 V disables with 50 µA standby current. |
| VSW | Switch node output | Drives external inductor and catch diode; swings between VIN and ~−0.4 V (Schottky drop) during switching. |
| GND | Power ground | Common return for input/output capacitors and internal circuitry; requires short, low-inductance PCB trace. |
| VIN | Input supply | Accepts 6.5–40 V DC; must be bypassed with local high-frequency capacitor to minimize noise and ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25 Ω RDS(ON) enables high-efficiency buck conversion without external MOSFET - reduces BOM count and layout complexity. |
| Fixed 260 kHz oscillator | Enables predictable EMI profile and consistent filter design using standard inductors; avoids subharmonic instability seen in variable-frequency controllers. |
| Soft-start with external capacitor | Prevents inrush current and output overshoot during startup - critical for powering sensitive downstream logic or analog circuits. |
| TTL-compatible ON/OFF control | Allows seamless integration into system-level power sequencing with microcontroller GPIO or supervisor IC outputs. |
| Thermal + current-limit protection | Automatically shuts down under overload or overheating, then recovers after fault clears - eliminates need for external protection circuitry. |
Applications
| Industrial Power Supply | Embedded System Point-of-Load |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, efficient, and protected DC output for field-side electronics. Use Value: Delivers 500 mA at >90% efficiency with no heatsink required - reduces board area and thermal management overhead. |
Use Scenario: Generating 1.8 V or 2.5 V core voltage for FPGA or microcontroller in space-constrained edge devices. IC Role / Device Role / Timing Role: Adjustable-output step-down converter enabling flexible voltage rail design across multiple SoC variants. Use Value: 1.21 V reference and resistor-programmable output allow precise matching to processor VDD requirements without custom ICs. |
| Automotive Subsystem Power | Test & Measurement Equipment |
|
Use Scenario: Powering infotainment display backlight drivers and CAN transceivers from 12 V battery rail. IC Role / Device Role / Timing Role: Pre-regulator supplying clean, stable intermediate voltage before LDO post-regulation. Use Value: Wide 6.5–40 V input range accommodates cold-crank (6.5 V) and load-dump (40 V) transients without external protection. |
Use Scenario: Providing isolated, low-noise auxiliary rails in portable oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Synchronized buck converter enabling deterministic ripple frequency for EMI filtering and measurement repeatability. Use Value: SYNC pin allows locking switching frequency to system clock - eliminates beat frequencies and improves spectral purity. |
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-ADJ/NOPB | Same pinout and function but rated for 1 A output current; higher RDS(ON) (0.35 Ω) and slightly lower efficiency at light loads. | Better suited for higher-current loads (>500 mA); requires larger inductor and output capacitor. | Select when sustained >500 mA output is required and board space allows larger magnetics. |
| TPS54302DDCR | 3 A synchronous buck with integrated high/low-side FETs; 2.5–18 V input; 0.8 V reference; 500 kHz switching. | Higher integration eliminates external diode; smaller solution size but requires more complex compensation. | Choose for space-constrained designs needing >500 mA or synchronous efficiency; not pin-compatible. |
Compared with LM2671MX-ADJ/NOPB, LM2672MX-ADJ/NOPB offers higher current headroom at minor efficiency trade-offs, while TPS54302DDCR delivers greater integration and frequency flexibility at the cost of design complexity and non-interchangeability.
Availability
LM2671MX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system point-of-load conversion, and automotive subsystem power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2671MX-ADJ/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs and broad distribution through authorized channels.
The LM2671MX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed 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 minimum input voltage required for stable operation of the LM2671MX-ADJ/NOPB?
The LM2671MX-ADJ/NOPB specifies a minimum recommended input voltage of 6.5 V across its operating temperature range. Below this, regulation may fail or the internal bias circuitry may not function reliably. The absolute maximum rating is 45 V, but operation above 40 V is not recommended for long-term reliability. Always verify dropout margin using the selected output voltage and load current.
How do I calculate the output voltage for the LM2671MX-ADJ/NOPB using the feedback resistors?
The LM2671MX-ADJ/NOPB sets output voltage using a resistor divider from VOUT to FB to GND. The formula is VOUT = 1.21 V × (1 + R1/R2), where R1 connects VOUT to FB and R2 connects FB to GND. For example, R1 = 10 kΩ and R2 = 1.24 kΩ yields ~11.3 V. Ensure R2 ≤ 100 kΩ to limit bias current error and maintain accuracy.
Does the LM2671MX-ADJ/NOPB require an external catch diode, and what type is recommended?
Yes, the LM2671MX-ADJ/NOPB requires an external Schottky diode connected from VSW to VOUT. A 3 A, 50 V Schottky rectifier (e.g., IR 30WQ05F) is recommended per TI's typical application. Fast recovery and low forward voltage (<0.5 V) are critical to minimize conduction loss and maintain efficiency, especially at higher output currents.
Can the LM2671MX-ADJ/NOPB be synchronized to an external clock, and what are the constraints?
Yes, the LM2671MX-ADJ/NOPB supports synchronization via its SYNC pin. The external clock must exceed 275 kHz (the max internal oscillator frequency) and be TTL/CMOS compatible (0–3.3 V or 0–5 V logic levels). TI recommends AC coupling with a 100 pF capacitor and 1 kΩ pull-down resistor. Note: current-limit foldback is disabled during sync mode, reducing short-circuit protection.
What thermal considerations apply to the LM2671MX-ADJ/NOPB in SOIC package?
The LM2671MX-ADJ/NOPB in SOIC (D package) has a junction-to-ambient thermal resistance (RθJA) of 105 °C/W with standard PCB copper. At 500 mA and 12 V input → 5 V output, power dissipation is ~0.35 W - resulting in ~37 °C junction rise above ambient. No heatsink is needed if ambient stays below 88 °C, but thermal vias and 1+ sq-in copper pour significantly improve margin.
LM2671MX-ADJ/NOPB 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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 37V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM2671MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671MX-ADJ/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 LM2671MX-ADJ/NOPB reliable?
The price and inventory of LM2671MX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2671MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671MX-ADJ/NOPB?
LM2671MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671MX-ADJ/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 LM2671MX-ADJ/NOPB?
For technical support, including LM2671MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2671MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671MX-ADJ/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 LM2671MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671MX-ADJ/NOPB?
All LM2671MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671MX-ADJ/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 LM2671MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2671MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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