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Texas Instruments LM2675LDX-ADJ/NOPB
- Part No.:
- LM2675LDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2675LDX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
LM2675LDX-ADJ/NOPB 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 output current 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 - designed for high-efficiency (>90%) point-of-load conversion in industrial and embedded power supplies.
For engineers reviewing the LM2675LDX-ADJ/NOPB datasheet, LM2675LDX-ADJ/NOPB pinout, LM2675LDX-ADJ/NOPB application, or LM2675LDX-ADJ/NOPB equivalent, key selection considerations include its 8-pin SOIC package, ±1.5% output voltage tolerance over line/load/temperature, 8 V–40 V input range, TTL-compatible ON/OFF control, and minimal external component count (5 total).
Technical Context
The LM2675LDX-ADJ/NOPB implements a synchronous-free buck topology using an internal N-channel DMOS high-side switch and external catch diode. Its 260 kHz oscillator enables compact LC filter design while maintaining stable operation across –40°C to +125°C junction temperature. The feedback loop regulates output by comparing FB pin voltage to a precision 1.21 V internal reference, supporting programmable output via resistor divider.
Functional modes include active regulation (ON/OFF ≥1.4 V) and low-power shutdown (ON/OFF ≤0.8 V, 50–150 μA standby current). Protection features are cycle-by-cycle current limiting (1.2–2.2 A threshold), thermal shutdown, and frequency foldback under extreme overload - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A continuous - supports mid-power loads without external current boosting |
| Input voltage range | 8 V to 40 V - compatible with 12 V/24 V industrial rails and wide-input battery systems |
| Output voltage range | 1.21 V to 37 V adjustable - set via external resistor divider on FB pin |
| Feedback reference | 1.21 V ±1.5% - enables precise output regulation with standard 1% resistors |
| Switching frequency | 260 kHz ±10% - balances EMI, efficiency, and inductor size (e.g., 33–68 µH typical) |
| Efficiency | Up to 96% - reduces thermal load; PCB copper traces suffice as heatsink |
| Quiescent current | 3.6 mA active / 50–150 μA shutdown - suitable for battery-backed or low-power standby systems |
Pinout & Package
LM2675LDX-ADJ/NOPB is supplied in an 8-pin SOIC (D) package (4.9 mm × 6.0 mm), with exposed pad not present. Pin functions are validated per TI SNVS129G Rev. JUNE 2025.
| 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 |
| FB | Feedback sense input | Monitors output via resistor divider; regulates VOUT by holding FB = 1.21 V |
| GND | Power ground | Primary return path for VIN, CIN, COUT, and thermal conduction - must be short, low-impedance |
| ON/OFF | Enable control input | TTL-compatible; ≥1.4 V enables regulation, ≤0.8 V enters 50 μA shutdown mode |
| VIN | Input supply | Accepts 8–40 V; connects to high-frequency bypass capacitor (CIN) with minimal trace length |
| VSW | Switch node output | Drives external inductor and catch diode cathode; high dv/dt node requiring careful layout |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external high-side MOSFET; RDS(ON) = 0.25 Ω typ at 25°C |
| Patented internal frequency compensation | Enables stable operation with only 5 external components - no loop compensation design required |
| Thermal shutdown + current limit | Self-protecting under overload, short-circuit, or poor heatsinking - no external fault management needed |
| WEBENCH® Power Designer support | Generates complete schematic, BOM, efficiency simulation, and thermal analysis directly from TI's tool |
| Fixed 260 kHz oscillator | Predictable EMI profile and consistent filter sizing - avoids variable-frequency noise spreading |
Applications
| Industrial PLC I/O Module Power | Medical Sensor Signal Chain Supply |
|---|---|
Use Scenario: Providing isolated 3.3 V or 5 V rail from 24 V backplane in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated power to microcontrollers, ADCs, and digital isolators. Use Value: High efficiency (>90%) minimizes heat buildup in sealed enclosures; 1 A output supports multiple downstream LDOs or logic rails. |
Use Scenario: Generating low-noise 2.5 V or 3.3 V bias for precision analog front-ends in portable patient monitors. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulators to achieve ultra-low ripple and PSRR. Use Value: Adjustable output allows tight matching to sensor/ADC reference voltages; ±1.5% tolerance ensures measurement accuracy. |
| Automotive Body Control Unit (BCU) | Test & Measurement Equipment Auxiliary Rail |
Use Scenario: Converting 12 V vehicle battery to 5 V for microcontroller, CAN transceiver, and LED drivers in door modules. IC Role / Device Role / Timing Role: Main DC-DC converter handling transient-heavy automotive input (load dump, cold crank). Use Value: 8–40 V input range survives 24 V system transients; thermal shutdown prevents latch-up during sustained overloads. |
Use Scenario: Creating user-configurable auxiliary outputs (e.g., ±12 V, 15 V) in bench power supplies or automated test fixtures. IC Role / Device Role / Timing Role: Programmable intermediate stage enabling flexible output voltage selection via front-panel controls. Use Value: 1.21–37 V adjustability supports diverse DUT requirements; fixed 260 kHz simplifies EMI filtering in lab-grade equipment. |
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/NOPB | 52 kHz switching frequency, 3 A output, wider 4–60 V input range, larger SOIC-16 package | Better suited for higher-current or ultra-wide-input designs; requires larger inductors/capacitors due to lower frequency | Choose when >1 A load or >40 V input is required; avoid if board space or EMI constraints favor 260 kHz |
| TPS54202DDCR | 2.5–17 V input, 2 A output, 500 kHz switching, integrated high/low-side FETs, smaller SOT-23-6 package | Higher integration and frequency enable smaller solution size but narrower input range and no HV capability | Prefer for compact, low-input-voltage (<17 V) designs where PCB area is critical and 40 V rating is unnecessary |
Compared with LM2675LDX-ADJ/NOPB, LM2575HVSX-ADJ/NOPB trades higher current and input range for lower frequency and larger footprint, while TPS54202DDCR offers greater integration and density at the expense of HV operation and external diode elimination - making LM2675LDX-ADJ/NOPB optimal for cost-sensitive, 8–40 V, 1 A industrial buck applications requiring proven reliability and minimal external parts.
Availability
LM2675LDX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, medical sensor power supplies, automotive body control units, and test equipment auxiliary rails requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for LM2675LDX-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2675 belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components, robust protection, and broad input voltage range are essential.
FAQ
What is the maximum input voltage rating for LM2675LDX-ADJ/NOPB?
The absolute maximum input voltage for LM2675LDX-ADJ/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe power dissipation limits and may trigger thermal shutdown. For reliable long-term use, maintain VIN ≤40 V under worst-case load and ambient conditions.
How do I calculate the feedback resistor values for a target output voltage with LM2675LDX-ADJ/NOPB?
Use the formula VOUT = 1.21 V × (1 + R1/R2), where R2 is typically 10 kΩ–100 kΩ. For example, to set 12 V output: R1 = R2 × (12/1.21 − 1) ≈ R2 × 8.92. With R2 = 12.1 kΩ, R1 = 108 kΩ (standard 1% value). Always verify stability with actual layout and load transients.
Does LM2675LDX-ADJ/NOPB require an external catch diode, and what type is recommended?
Yes, LM2675LDX-ADJ/NOPB requires an external Schottky diode connected from VSW to GND. TI recommends a 3.3 A, 50 V device like IR 30WQ05F - selected for low forward voltage (to preserve efficiency) and fast recovery (to minimize switching losses). Avoid standard PN diodes due to reverse recovery issues.
What thermal considerations apply to LM2675LDX-ADJ/NOPB in SOIC-8 packaging?
LM2675LDX-ADJ/NOPB in SOIC-8 has RθJA = 105°C/W on a standard 4-layer JEDEC board. At 1 A load and 12 V input, typical power dissipation is ~0.3 W - resulting in ~32°C rise above ambient. No heatsink is needed; however, ≥1 in² of 2-oz copper pour connected to GND pins significantly improves thermal performance and reliability.
Can LM2675LDX-ADJ/NOPB be synchronized to an external clock?
No, LM2675LDX-ADJ/NOPB uses an internal fixed-frequency 260 kHz oscillator and does not support external synchronization. For synchronizable alternatives, consider TI's TPS54x02 series or newer SIMPLE SWITCHER® devices like LM5164, which offer SYNC pin functionality and higher integration.
LM2675LDX-ADJ/NOPB 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/NOPB FAQ
1.How can I place an order for LM2675LDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675LDX-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 LM2675LDX-ADJ/NOPB reliable?
The price and inventory of LM2675LDX-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 LM2675LDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675LDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675LDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675LDX-ADJ/NOPB?
LM2675LDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675LDX-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 LM2675LDX-ADJ/NOPB?
For technical support, including LM2675LDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675LDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2675LDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675LDX-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 LM2675LDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675LDX-ADJ/NOPB?
All LM2675LDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675LDX-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 LM2675LDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2675LDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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