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Texas Instruments LM2675LDX-ADJ
- Part No.:
- LM2675LDX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2675LDX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,453
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Product details
Overview
LM2675LDX-ADJ from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC with adjustable output voltage (1.21 V to 37 V), 1 A continuous load capability, and 260 kHz fixed-frequency operation. It integrates a DMOS power MOSFET switch, internal frequency compensation, and protection circuitry including thermal shutdown and current limiting. It serves as a primary voltage conversion stage in industrial power supplies and embedded systems requiring high efficiency (>90%) and minimal external components.
For engineers reviewing the LM2675LDX-ADJ datasheet, LM2675LDX-ADJ pinout, LM2675LDX-ADJ application, or LM2675LDX-ADJ equivalent, key selection criteria include its 8 V–40 V input range, ±1.5% output voltage tolerance over line/load/temperature, 50 μA standby current in shutdown mode, and compatibility with standard off-the-shelf inductors and Schottky diodes for rapid design implementation.
Technical Context
The LM2675LDX-ADJ implements a synchronous-free buck topology using an integrated high-side DMOS FET switch and internal current-mode control with fixed 260 kHz oscillator. Feedback regulation is achieved by comparing the FB pin voltage (targeted at 1.21 V ±1.5%) against an internal reference, enabling precise output adjustment via external resistor divider.
It operates across –40°C to +125°C junction temperature, supports TTL-compatible ON/OFF control with 1.4 V threshold, and delivers full protection via cycle-by-cycle current limiting (1.25–2.1 A typical), thermal shutdown, and frequency foldback under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A continuous - supports single-rail microcontroller or FPGA core supply without external boost stages. |
| Input voltage range | 8 V to 40 V - accommodates unregulated 12 V/24 V industrial rails and automotive battery transients. |
| Output voltage range | 1.21 V to 37 V - set via external resistive divider on FB pin; enables flexible system-level voltage scaling. |
| Feedback reference | 1.21 V ±1.5% - defines output accuracy; determines minimum resolvable output step in adjustable configurations. |
| Switching frequency | 260 kHz ±10% - enables use of compact 22–68 µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | Up to 96% - minimizes thermal dissipation; allows PCB copper traces alone to serve as heat sink in most layouts. |
| Standby current | 50 µA typical - enables low-power sleep modes in battery-backed or energy-conscious applications. |
Pinout & Package
LM2675LDX-ADJ is packaged in an 8-pin SOIC (D package), measuring 4.9 mm × 6 mm, with exposed thermal pad connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor between CB and VSW to drive high-side FET gate above VIN; critical for proper switch conduction. |
| FB | Feedback sense input | Monitors output voltage via resistor divider; regulates VOUT by maintaining 1.21 V at this pin; open or shorted condition causes regulation failure. |
| GND | Power ground | Primary return path for input/output capacitors and inductor; must be low-impedance and directly tied to thermal pad for thermal and electrical stability. |
| ON/OFF | Enable control input | TTL-compatible logic input; ≥1.4 V enables regulation, ≤0.8 V disables output and enters 50 µA standby mode. |
| VIN | Input supply | Accepts 8–40 V DC; requires local 22 µF tantalum bypass capacitor placed within 5 mm of pin to suppress high-frequency switching noise. |
| VSW | Switch node output | Drives external inductor and Schottky diode cathode; carries high dv/dt square wave; must be routed with minimal loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external high-side MOSFET and driver; reduces BOM count and layout complexity while ensuring matched timing. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components (inductor, diode, input/output caps, feedback divider); no external compensation network required. |
| Thermal shutdown + current limit | Provides autonomous fault recovery: current limiting engages at ~1.5 A, then thermal shutdown activates if die temperature exceeds 150°C. |
| WEBENCH® Power Designer support | Generates complete schematics, bill-of-materials, efficiency plots, and thermal simulations directly from TI's online tool-no manual calculations needed. |
| Fixed 260 kHz oscillator | Ensures predictable EMI profile and simplifies filter design; avoids subharmonic oscillation through internal slope compensation. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Rail |
|---|---|
Use Scenario: Providing clean, regulated 3.3 V or 5 V from a noisy 24 V factory bus to power PLC I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Primary buck converter delivering 1 A at ±1.5% output accuracy; handles 40 V transients and maintains regulation during brownouts down to 8 V. Use Value: Eliminates need for pre-regulator LDO stages; achieves >90% efficiency to avoid forced-air cooling in sealed enclosures. | Use Scenario: Generating a configurable core voltage (e.g., 1.8 V, 2.5 V, or 3.3 V) for ARM Cortex-M or RISC-V SoCs in portable edge devices. IC Role / Device Role / Timing Role: Adjustable-output DC-DC regulator controlled via resistor divider; supports dynamic voltage scaling when paired with MCU GPIO monitoring. Use Value: Enables precise voltage tuning without changing IC; 50 µA shutdown current extends battery life during deep-sleep modes. |
| Medical Sensor Signal Chain | Automotive Body Control Module |
Use Scenario: Powering low-noise analog front-ends (ADCs, op-amps, precision references) in portable diagnostic equipment. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulators (LDOs); provides ripple-rejected intermediate rail at 5 V or 12 V. Use Value: 260 kHz switching frequency allows effective LC filtering before LDO input; high PSRR of downstream LDOs further attenuates residual ripple. | Use Scenario: Converting vehicle battery voltage (9–16 V) to stable 5 V for microcontrollers, CAN transceivers, and LED drivers in BCMs. IC Role / Device Role / Timing Role: Main DC-DC converter with enable control synchronized to ignition signal; withstands load-dump transients up to 40 V. Use Value: Integrated current limit and thermal protection meet AEC-Q100 stress requirements without external supervision circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVSX-ADJ | Higher 63 V max input, 52 kHz switching frequency, 3 A peak current limit, larger SOIC-16 package. | Better suited for wide-input industrial or telecom applications where 40 V input ceiling is insufficient. | Select when input voltage may exceed 40 V or higher peak current headroom is required; expect larger magnetics and lower efficiency at 1 A. |
| TPS54202DDCR | 2 A output, 4.5–28 V input, 500 kHz switching, integrated high/low-side FETs, smaller SOT-23-6 package. | Designed for space-constrained, higher-efficiency designs needing tighter regulation and faster transient response. | Choose for compact PCBs or when >1 A load margin, lower quiescent current (25 µA), or improved light-load efficiency are priorities. |
Compared with LM2675LDX-ADJ, LM2575HVSX-ADJ trades higher input voltage tolerance and ruggedness for lower switching frequency and larger footprint, while TPS54202DDCR offers higher integration and density at the cost of reduced input voltage range and different thermal management requirements.
Availability
LM2675LDX-ADJ is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for LM2675LDX-ADJ 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 LM2675 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust operation in industrial, automotive, and medical power supply applications.
FAQ
What is the maximum input voltage rating for LM2675LDX-ADJ?
The absolute maximum input voltage for LM2675LDX-ADJ is 45 V, but the recommended operating range is 8 V to 40 V. Exceeding 40 V risks violating safe operating area limits and may trigger internal protection circuits. The device is commonly used with 24 V industrial rails and can tolerate brief 40 V transients per specification. Always verify input capacitance and layout integrity when operating near the upper limit.
How do I configure the output voltage of LM2675LDX-ADJ?
LM2675LDX-ADJ uses a resistor divider connected between VOUT and GND, with the midpoint feeding the FB pin. Output voltage is calculated as VOUT = 1.21 V × (1 + R1/R2), where R2 is typically 10 kΩ–100 kΩ. For example, R1 = 10.2 kΩ and R2 = 10 kΩ yields ~2.43 V. Ensure FB trace is short and远离 noisy nodes like VSW to prevent regulation instability. The LM2675LDX-ADJ datasheet provides detailed design equations and layout guidance in Section 7.2.2.
Does LM2675LDX-ADJ require an external bootstrap capacitor?
Yes, LM2675LDX-ADJ requires a 470 nF ceramic capacitor connected between the CB and VSW pins to charge the high-side FET gate driver. This capacitor must be placed adjacent to the IC with minimal trace length and low ESL. Omitting or undersizing it causes poor high-side switch turn-on, increased conduction losses, and potential thermal runaway. The LM2675LDX-ADJ functional block diagram and Pin Functions table (Section 4) explicitly define this requirement.
What protection features does LM2675LDX-ADJ include?
LM2675LDX-ADJ integrates cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown (activates at ~150°C junction temperature), and frequency foldback during sustained overloads or short circuits. It also supports TTL-compatible ON/OFF control for system-level power sequencing. These protections operate autonomously without external components-no sense resistors or supervisor ICs are needed. All protection behaviors are verified across –40°C to +125°C and documented in Sections 5.8 and 6.4 of the LM2675LDX-ADJ datasheet.
Can LM2675LDX-ADJ be used in automotive applications?
LM2675LDX-ADJ meets key automotive electrical requirements-including 40 V load-dump tolerance, –40°C to +125°C operation, and integrated protection-but is not AEC-Q100 qualified. It has been widely deployed in non-safety-critical automotive body electronics (e.g., infotainment power rails, lighting controllers). For ASIL-B/C systems, TI recommends AEC-Q100-qualified alternatives like the TPS54560Q. Always validate LM2675LDX-ADJ in final vehicle EMI and thermal environments per your OEM's test plan.
LM2675LDX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1A
- 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)
LM2675LDX-ADJ FAQ
1.How can I place an order for LM2675LDX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675LDX-ADJ 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 LM2675LDX-ADJ reliable?
The price and inventory of LM2675LDX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675LDX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2675LDX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675LDX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675LDX-ADJ?
LM2675LDX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675LDX-ADJ 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 LM2675LDX-ADJ?
For technical support, including LM2675LDX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675LDX-ADJ requirements.
6.How does Aetrix verify that LM2675LDX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2675LDX-ADJ 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 LM2675LDX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2675LDX-ADJ?
All LM2675LDX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2675LDX-ADJ, 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 LM2675LDX-ADJ part is unused and in its original packaging.
Return procedure for LM2675LDX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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