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Texas Instruments LM2675LD-ADJ
- Part No.:
- LM2675LD-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2675LD-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
LM2675LD-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, 260 kHz fixed-frequency operation, ±1.5% output voltage tolerance over line and load, and 8 V to 40 V input range - used in industrial power supplies, embedded system point-of-load conversion, and battery-powered equipment requiring high-efficiency regulation.
For engineers reviewing the LM2675LD-ADJ datasheet, LM2675LD-ADJ pinout, LM2675LD-ADJ application, or LM2675LD-ADJ equivalent, key selection considerations include feedback voltage accuracy (1.21 V ±1.5%), thermal shutdown protection, TTL-compatible enable control, bootstrap capacitor interface for high-side FET drive, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2675LD-ADJ integrates a DMOS power MOSFET switch, internal frequency compensation, and a 260 kHz oscillator to implement a complete synchronous-buck topology without external timing components. Its feedback loop regulates output by comparing FB pin voltage to an internal 1.21 V reference, enabling precise output programming via resistor divider.
It operates in continuous conduction mode up to 1 A load, features cycle-by-cycle current limiting (1.25–2.1 A typical), thermal shutdown, and low-power standby mode (50 μA typical). The ON/OFF pin provides TTL-level enable control with 1.4 V threshold, and the CB pin interfaces a 470 nF bootstrap capacitor to drive the high-side switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 1.21 V to 37 V - set externally via resistor divider on FB pin; enables single part to support wide range of system rails. |
| Feedback reference voltage | 1.21 V ±1.5% - defines output accuracy baseline; determines R1/R2 ratio for target VOUT. |
| Switching frequency | 260 kHz ±10% - fixed internal oscillator; enables use of compact, low-ESR ceramic input/output capacitors and standard 22–68 µH inductors. |
| Max output current | 1 A continuous - supported across full temperature range (–40°C to +125°C); limited by internal current sense and thermal design. |
| Input voltage range | 8 V to 40 V - wide VIN supports unregulated 12 V/24 V bus inputs and battery-derived supplies with headroom. |
| Quiescent current | 3.6 mA typical - active-mode supply current; impacts light-load efficiency in always-on systems. |
| Standby current | 50 µA typical - achieved when ON/OFF pin is pulled low; enables ultra-low-power sleep states. |
| Switch RDS(on) | 0.3 Ω typical at 25°C - directly limits conduction loss and thermal rise under full load. |
Pinout & Package
LM2675LD-ADJ is packaged in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed thermal pad connected internally to GND. Pin functions are validated per TI SNVS129G datasheet Figure 4-1 and Table 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor between CB and VSW to generate gate drive voltage for internal high-side DMOS FET. |
| FB (Pin 4) | Feedback input | Sense node for output voltage divider; internal comparator compares this to 1.21 V reference to regulate VOUT. |
| GND (Pin 6) | Power ground | Main return path for input capacitor (CIN), output capacitor (COUT), and internal switch; must be short, low-impedance PCB trace. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible digital input; ≥1.4 V enables regulation, ≤0.8 V disables output and enters 50 µA standby mode. |
| VIN (Pin 7) | Input supply | Connects to 8–40 V source and high-frequency bypass capacitor (CIN); high-current path requiring minimal trace inductance. |
| VSW (Pin 8) | Switch node | Drain of internal high-side FET; connects to inductor and Schottky catch diode cathode; carries high dv/dt switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Enables self-contained buck converter with only 5 external components - reduces BOM count and layout complexity. |
| Patented internal frequency compensation | Eliminates need for external compensation network; ensures stable loop response across all operating conditions and component tolerances. |
| Thermal shutdown + current limit | Provides dual-layer fault protection: cycle-by-cycle current limiting (1.25–2.1 A) and junction temperature cutoff at ~150°C. |
| Fixed 260 kHz switching frequency | Allows predictable EMI filtering and consistent inductor sizing; avoids subharmonic oscillation in CCM operation. |
| Adjustable output via FB pin | Supports 1.21–37 V output using two resistors; eliminates need for multiple fixed-voltage SKUs in multi-rail designs. |
| TTL shutdown with 50 µA standby | Enables system-level power sequencing and low-quiescent-power sleep modes without external logic or regulators. |
Applications
| Industrial Power Supply | Embedded System PoL |
|---|---|
|
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 step-down regulator delivering regulated 5 V at up to 1 A with <1.5% output tolerance across temperature and load. Use Value: High efficiency (>90%) minimizes heat sink requirements; 260 kHz switching allows compact 47 µH inductor and ceramic capacitors. |
Use Scenario: Generating 3.3 V rail for microcontroller, memory, and peripherals in portable test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 3.3 V with FB divider; enabled/disabled via MCU GPIO. Use Value: 50 µA standby current extends battery life during idle; integrated current limit protects against short-circuit faults. |
| Positive-to-Negative Converter | Preregulator for Linear Regulator |
|
Use Scenario: Generating –5 V from +12 V input for op-amp biasing in analog signal chains. IC Role / Device Role / Timing Role: Buck converter operated in inverting configuration (VSW grounded, output taken from FB/CB node). Use Value: Leverages same 260 kHz oscillator and current-limit protection; avoids need for dedicated inverting controller IC. |
Use Scenario: Reducing 24 V input to 7 V before LDO stage to minimize dropout and thermal dissipation. IC Role / Device Role / Timing Role: Efficient preregulator lowering headroom for downstream linear regulator; improves overall system efficiency. Use Value: 94% efficiency at 12 V→5 V reduces power loss by >70% vs. direct LDO conversion from 24 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575H-ADJ | Higher input voltage rating (60 V max), lower switching frequency (52 kHz), larger minimum inductor value required. | Better suited for high-input-voltage industrial or automotive applications where 40 V VIN ceiling is insufficient. | Select LM2575H-ADJ only if input exceeds 40 V or lower EMI frequency is preferred; LM2675LD-ADJ offers superior efficiency and smaller magnetics at 260 kHz. |
| TPS54202D | Higher switching frequency (480–2.2 MHz), integrated soft-start, higher efficiency (>95%), but requires external compensation. | Preferred for space-constrained designs needing faster transient response and smaller 1–2.2 µH inductors. | Choose TPS54202D when board area is critical and design team can manage compensation; LM2675LD-ADJ delivers simpler, proven stability with no external compensation. |
Compared with LM2575H-ADJ and TPS54202D, the LM2675LD-ADJ balances simplicity, thermal robustness, and mid-frequency efficiency - making it optimal for cost-sensitive, thermally constrained industrial and embedded buck converters where 260 kHz operation and 1 A output meet system requirements without added complexity.
Availability
LM2675LD-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system point-of-load conversion, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and verified thermal performance.
Supply support for LM2675LD-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, telecom, and consumer power applications.
FAQ
What is the feedback reference voltage of the LM2675LD-ADJ, and how does it affect output accuracy?
The LM2675LD-ADJ has a precision internal feedback reference voltage of 1.21 V with ±1.5% tolerance over temperature and load. This value sets the baseline for output voltage calculation using the FB resistor divider (VOUT = 1.21 V × (1 + R1/R2)). Because the reference tolerance directly propagates into output error, selecting tight-tolerance (±1%) resistors and minimizing PCB trace noise on the FB node is essential to achieve specified ±1.5% total output regulation.
Can the LM2675LD-ADJ operate with an input voltage below 8 V?
No - the LM2675LD-ADJ has a minimum recommended input voltage of 8 V per TI SNVS129G Section 5.3. Operation below this violates recommended conditions and may result in failure to start, unstable regulation, or violation of absolute maximum ratings due to insufficient gate drive margin for the internal DMOS switch. For sub-8 V inputs, consider the LM2678 or TPS54202D families instead.
How is thermal performance managed in the LM2675LD-ADJ SOIC package?
The LM2675LD-ADJ in SOIC (D package) has a junction-to-ambient thermal resistance (RθJA) of 105°C/W on a standard 4-layer JEDEC board with ~1 in² copper. To maintain safe operation at 1 A load, PCB layout must maximize copper area around the GND pins and thermal pad (if present), minimize trace length for high-current paths (VIN, VSW, GND), and avoid enclosing the IC in thermally isolated zones. Derating is required above +85°C ambient.
What external components are mandatory for basic LM2675LD-ADJ operation?
Five mandatory external components are required: input capacitor (CIN, ≥22 µF tantalum or ceramic), output capacitor (COUT, ≥47 µF), power inductor (22–68 µH), Schottky catch diode (≥3 A, ≥50 V), and bootstrap capacitor (470 nF ceramic between CB and VSW). Additionally, two resistors form the FB voltage divider to set output voltage - making exactly seven components for full adjustable operation.
Does the LM2675LD-ADJ support synchronization to an external clock?
No - the LM2675LD-ADJ uses an internal fixed-frequency 260 kHz oscillator with no provision for external clock synchronization. Frequency variation is limited to ±10% over temperature and process. For synchronized operation, consider TI's TPS54x02 or TPS6286x families, which provide SYNC pin functionality and adjustable switching frequencies.
LM2675LD-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)
LM2675LD-ADJ FAQ
1.How can I place an order for LM2675LD-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675LD-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 LM2675LD-ADJ reliable?
The price and inventory of LM2675LD-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675LD-ADJ is usually 5 days.
3.What payment methods are accepted for LM2675LD-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675LD-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675LD-ADJ?
LM2675LD-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675LD-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 LM2675LD-ADJ?
For technical support, including LM2675LD-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675LD-ADJ requirements.
6.How does Aetrix verify that LM2675LD-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2675LD-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 LM2675LD-ADJ meets industry standards.
7.What is the process for return or replacement of LM2675LD-ADJ?
All LM2675LD-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2675LD-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 LM2675LD-ADJ part is unused and in its original packaging.
Return procedure for LM2675LD-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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