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Texas Instruments LM2675N-ADJ
- Part No.:
- LM2675N-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2675N-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
LM2675N-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 output current 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 rails, and point-of-load conversion.
For engineers reviewing the LM2675N-ADJ datasheet, LM2675N-ADJ pinout, LM2675N-ADJ application, or LM2675N-ADJ equivalent, key selection criteria include feedback reference accuracy (1.21 V), thermal shutdown protection, TTL-compatible enable control, bootstrap capacitor requirement, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2675N-ADJ integrates a DMOS high-side power 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 against an internal 1.21 V reference, requiring only two external resistors for voltage setting.
It operates in continuous conduction mode up to 1 A load, supports TTL-level ON/OFF control with 50 μA standby current, and includes cycle-by-cycle current limiting plus thermal shutdown. The device uses a bootstrap capacitor (CB) to drive the high-side FET gate, necessitating careful PCB layout for the CB–VSW node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports full-load operation without derating at 25°C ambient with minimal copper heatsinking. |
| Input Voltage Range | 8 V to 40 V - enables direct use with 12 V, 24 V, and 36 V industrial bus rails. |
| Feedback Reference | 1.21 V ±1.5% - sets output via resistor divider; enables precise 1.21–37 V adjustment with <0.1% divider error contribution. |
| Switching Frequency | 260 kHz ±10% - allows compact LC filter design; avoids audible noise and simplifies EMI filtering vs. lower-frequency regulators. |
| Efficiency | Up to 96% - reduces thermal load on PCB; eliminates need for dedicated heatsinks in most applications. |
| Quiescent Current | 3.6 mA typical - ensures low no-load power loss in always-on systems. |
| Standby Current | 50 μA typical - enables ultra-low-power shutdown for battery-backed subsystems. |
Pinout & Package
LM2675N-ADJ is supplied in an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 9.43 mm footprint, through-hole mounting, and exposed pad not present. Thermal performance relies on PCB copper area connected to GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CB) | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor to VSW; critical for high-side FET gate drive - poor layout causes dropout or oscillation. |
| 4 (FB) | Feedback sense input | High-impedance input referenced to 1.21 V; connects midpoint of R1/R2 divider - trace must avoid noisy nodes to prevent regulation instability. |
| 5 (ON/OFF) | Enable control input | TTL-compatible logic input; ≥1.4 V enables regulation, ≤0.8 V disables with 50 μA standby - pull-up resistor required if microcontroller-driven. |
| 6 (GND) | Power ground | Main return path for input/output capacitors and inductor; must be low-inductance connection to minimize switching noise coupling. |
| 7 (VIN) | Input supply | Accepts 8–40 V DC; requires local 22 μF tantalum bypass capacitor placed within 5 mm - long traces cause input ripple and instability. |
| 8 (VSW) | Switch node | Drain of internal high-side MOSFET; connects to inductor and Schottky diode cathode - high dv/dt node requiring tight loop area to limit EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates external high-side MOSFET and driver; reduces BOM count and layout complexity for 1 A buck designs. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components - no loop compensation calculations or external RC networks required. |
| Thermal shutdown + current limit protection | Prevents damage during overload, short-circuit, or inadequate heatsinking - automatically recovers when fault clears. |
| WEBENCH® Power Designer support | Generates complete schematic, bill-of-materials, efficiency plots, and thermal simulations directly from TI's online tool. |
| ±1.5% output voltage tolerance | Meets tight regulation requirements for analog circuitry, ADC references, and FPGA core rails without post-regulation LDOs. |
Applications
| Industrial PLC I/O Module Power | Embedded System Core Rail |
|---|---|
Use Scenario: Providing isolated 3.3 V or 5 V rail for digital I/O conditioning circuits in programmable logic controllers operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V to 3.3 V/5 V with 1 A capacity for multiple sensor interfaces and optocoupler drivers. Use Value: High efficiency (>90%) minimizes heat buildup inside sealed enclosures; wide input range accommodates 24 V bus sag to 18 V without dropout. | Use Scenario: Generating 1.2 V or 1.8 V core voltage for ARM Cortex-M microcontrollers in portable instrumentation with battery backup. IC Role / Device Role / Timing Role: Adjustable buck converter configured via precision resistor divider to deliver exact core voltage under varying load conditions. Use Value: 1.21 V reference accuracy and ±1.5% tolerance ensure reliable MCU operation across temperature; 50 μA shutdown current extends battery life. |
| Medical Sensor Signal Chain Supply | Automotive Body Control Module Pre-regulator |
Use Scenario: Delivering clean, low-noise 5 V supply to analog front-end amplifiers and 16-bit ADCs in patient monitoring devices. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulator (LDO) to achieve ultra-low ripple; operates at fixed 260 kHz for predictable EMI filtering. Use Value: Fixed switching frequency enables deterministic EMI suppression; high PSRR of downstream LDO is preserved due to stable, ripple-free input. | Use Scenario: Converting 12 V vehicle battery to 5 V for microcontroller, CAN transceiver, and LED driver subsystems in door modules or seat controllers. IC Role / Device Role / Timing Role: Main DC-DC converter handling cold-crank (6.5 V) to load-dump (40 V) transients per ISO 7637-2. Use Value: 8–40 V input range covers full automotive voltage envelope; thermal shutdown prevents failure during prolonged high-temperature operation. |
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 | 52 kHz switching frequency, 3 A output, larger external components required, higher quiescent current (5.5 mA). | Better suited for high-current, low-EMI, or cost-sensitive designs where board space is less constrained. | Select when >1 A load or lower switching frequency is preferred; not drop-in compatible due to different pinout and compensation. |
| TPS54202D | 2.5 V to 28 V input, 2 A output, 480 kHz frequency, integrated soft-start, smaller 8-pin SOIC package. | Ideal for space-constrained designs needing higher current and tighter transient response. | Choose for modern, compact layouts; requires updated feedback divider and layout - not pin-to-pin with LM2675N-ADJ. |
Compared with LM2675N-ADJ, LM2575H-ADJ trades higher current and lower frequency for larger magnetics and reduced efficiency, while TPS54202D offers double the current and faster regulation at the cost of greater design complexity and non-interchangeable packaging.
Availability
LM2675N-ADJ is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller core rails, and medical sensor signal chain supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2675N-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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2675 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically to simplify robust, high-efficiency DC-DC buck regulator implementation with minimal external components and no loop compensation expertise required.
FAQ
What is the minimum input voltage required for stable operation of the LM2675N-ADJ?
The LM2675N-ADJ requires a minimum input voltage of 6.5 V under recommended operating conditions. Below this threshold, regulation cannot be maintained - especially when set for higher output voltages (e.g., >12 V) where duty cycle approaches 100%. For reliable startup and continuous operation, maintain VIN ≥ 8 V as specified in the absolute maximum ratings table. This ensures sufficient headroom for the internal control circuitry and high-side switch operation across temperature and load variations in the LM2675N-ADJ.
Can the LM2675N-ADJ be used in a synchronous rectification configuration?
No, the LM2675N-ADJ does not support synchronous rectification. It uses an internal DMOS high-side switch paired with an external Schottky diode for low-side conduction - the VSW pin is designed to drive the diode cathode, not a second MOSFET gate. Synchronous operation would require complementary low-side gate drive timing and dead-time control, which the LM2675N-ADJ lacks. For synchronous buck applications, consider TI's TPS54x02 or LM26420 families instead. The LM2675N-ADJ remains optimized for simplicity, cost, and reliability using proven diode-based topologies.
What is the purpose of the CB pin on the LM2675N-ADJ, and what capacitor value is recommended?
Pin 1 (CB) on the LM2675N-ADJ is the bootstrap capacitor connection for the high-side MOSFET gate driver. It provides the floating voltage needed to fully enhance the internal DMOS switch during each switching cycle. A 470 nF X7R ceramic capacitor rated for ≥16 V must be placed directly between CB and VSW pins with minimal trace length. Using a smaller value or high-ESR capacitor causes insufficient gate drive, leading to increased RDS(on), thermal stress, and potential dropout under load. This requirement is fundamental to proper operation of the LM2675N-ADJ and is explicitly defined in the Pin Functions table of the datasheet.
How does the LM2675N-ADJ handle overcurrent conditions, and is external current sensing needed?
The LM2675N-ADJ incorporates internal cycle-by-cycle current limiting with a typical threshold of 1.25 A at 25°C, rising to 2.2 A at 125°C. No external current-sense resistor or circuitry is required - the device monitors the high-side switch current directly. During overload, it terminates the ON-pulse immediately, then applies frequency foldback below 100 kHz under extreme short-circuit conditions to limit power dissipation. Thermal shutdown activates if junction temperature exceeds 150°C. These protections are fully integrated and active across the full operating range of the LM2675N-ADJ, eliminating need for external fault management.
Is the LM2675N-ADJ RoHS-compliant and suitable for lead-free reflow soldering?
Yes, the LM2675N-ADJ in PDIP (N) package is RoHS-compliant and rated for lead-free reflow soldering per JEDEC J-STD-020. The PDIP package has a peak reflow temperature rating of 260°C for 10 seconds. TI's official packaging information confirms Pb-free finish and compliance with EU RoHS Directive 2011/65/EU. All LM2675N-ADJ units distributed by Aetrix Electronics carry full material declarations and certificate of compliance. This makes the LM2675N-ADJ suitable for new designs targeting environmental compliance and modern assembly processes without requiring special soldering profiles.
LM2675N-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2675N-ADJ FAQ
1.How can I place an order for LM2675N-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675N-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 LM2675N-ADJ reliable?
The price and inventory of LM2675N-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675N-ADJ is usually 5 days.
3.What payment methods are accepted for LM2675N-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675N-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675N-ADJ?
LM2675N-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675N-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 LM2675N-ADJ?
For technical support, including LM2675N-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675N-ADJ requirements.
6.How does Aetrix verify that LM2675N-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2675N-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 LM2675N-ADJ meets industry standards.
7.What is the process for return or replacement of LM2675N-ADJ?
All LM2675N-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2675N-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 LM2675N-ADJ part is unused and in its original packaging.
Return procedure for LM2675N-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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