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Texas Instruments LM2675LD-ADJ/NOPB
- Part No.:
- LM2675LD-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2675LD-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,458
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Product details
Overview
LM2675LD-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 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 compact, high-efficiency power supplies for industrial control and embedded systems.
For engineers reviewing the LM2675LD-ADJ/NOPB datasheet, LM2675LD-ADJ/NOPB pinout, LM2675LD-ADJ/NOPB application, or LM2675LD-ADJ/NOPB equivalent, key selection criteria include feedback-based output programming, thermal shutdown protection, TTL-compatible enable control, and SOIC-8 package compatibility with minimal external component count (5 total).
Technical Context
The LM2675LD-ADJ/NOPB integrates a DMOS high-side power switch, internal frequency compensation, and a 260 kHz oscillator to implement a complete buck converter without requiring external compensation networks. Its feedback loop regulates output by maintaining 1.21 V on the FB pin via an external resistor divider.
It operates in active mode when the ON/OFF pin exceeds 1.4 V (typical), drawing 3.6 mA quiescent current, and enters low-power shutdown at ≤1.4 V with 50 μA standby current. Protection includes cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and frequency foldback under short-circuit conditions.
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 - accommodates wide-input industrial and automotive battery-derived rails. |
| Output Voltage Range | 1.21 V to 37 V - programmable via external resistive divider; enables flexible system-level rail generation. |
| Switching Frequency | 260 kHz (±10%) - enables use of small, standard inductors and reduces EMI compared to lower-frequency alternatives. |
| Feedback Reference | 1.21 V ±1.5% - defines output accuracy; sets minimum resolvable output voltage step in adjustable configurations. |
| Efficiency | Up to 96% - minimizes thermal stress and eliminates need for heatsinks beyond PCB copper. |
| Quiescent Current | 3.6 mA (active), 50 μA (standby) - enables low-power operation during light-load or sleep modes. |
Pinout & Package
LM2675LD-ADJ/NOPB 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 Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor between CB and VSW to bias high-side gate driver; critical for proper switch turn-on. |
| 2,3 - NC | No-connect | Unbonded pins; must remain unconnected and un-routed to avoid parasitic coupling or mechanical interference. |
| 4 - FB | Feedback sense input | Monitors output voltage via resistor divider; regulates output by holding this node at 1.21 V; trace routing must avoid noisy switching nodes. |
| 5 - ON/OFF | Enable control input | TTL-compatible digital input; ≥1.4 V enables regulation, ≤0.8 V disables output and reduces IQ to 50 μA. |
| 6 - GND | Power ground | Main return path for input/output capacitors and internal switch; requires low-inductance, short PCB trace to minimize noise and thermal resistance. |
| 7 - VIN | Input supply | Accepts 8–40 V DC; connects directly to high-frequency input capacitor (CIN); trace must be short and wide to reduce ESR/ESL effects. |
| 8 - VSW | Switch node output | Drives external inductor and catch diode; carries high dv/dt square wave; requires tight layout and minimal loop area to limit EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external MOSFET and gate driver; RDS(on) = 0.3 Ω (typ) ensures low conduction loss at 1 A. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components - no external compensation network required. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating; automatically recovers after fault removal without latch-up. |
| WEBENCH® Power Designer support | Generates complete bill-of-materials, schematic, and layout-ready design within minutes using real-time component availability and pricing. |
| Fixed 260 kHz oscillator | Provides predictable EMI profile and simplifies filter design; avoids subharmonic oscillation via built-in duty-cycle management. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Rail |
|---|---|
Use Scenario: Provides clean, regulated 3.3 V or 5 V from a 24 V factory bus to power PLC I/O modules and logic circuitry. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1 A output; handles wide input transients and maintains regulation during motor switching noise. Use Value: High efficiency (>90%) reduces board heat rise; SOIC-8 footprint allows dense placement near load; ±1.5% tolerance ensures reliable MCU reset and ADC reference stability. | Use Scenario: Generates core voltage for ARM Cortex-M or RISC-V SoCs in edge sensor nodes powered from 12 V wall adapters or PoE injectors. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.8 V or 1.2 V core rail; enabled/disabled via microcontroller GPIO for dynamic power gating. Use Value: 50 μA standby current extends battery life in sleep mode; 260 kHz switching enables compact 2.2 μH inductor; FB pin precision supports tight core voltage margins. |
| Point-of-Load Converter for FPGA I/O Banks | Preregulator for Linear Regulators |
Use Scenario: Supplies 2.5 V or 3.3 V to FPGA I/O banks from a 12 V intermediate rail in telecom baseband cards. IC Role / Device Role / Timing Role: Efficient point-of-load (POL) regulator placed adjacent to FPGA; handles fast load transients up to 1 A with minimal output capacitance. Use Value: Fast transient response (50 μs recovery) prevents I/O timing violations; SOIC-8 thermal pad improves heat dissipation under burst loads. | Use Scenario: Steps down 24 V industrial supply to ~6 V before feeding a low-noise LDO that powers analog front-end circuitry. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing LDO dropout and thermal load; operated continuously with ON/OFF pin tied high. Use Value: 94% efficiency at 24 V → 6 V conversion cuts LDO power dissipation by >70%; eliminates need for large heatsinks on downstream regulators. |
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; higher RDS(on) (0.4 Ω); 3 A current limit but rated for 1 A continuous; larger SOIC-16 package. | Lower frequency increases inductor/capacitor size; less suitable for space-constrained designs; better for ultra-low EMI environments. | Choose when EMI filtering priority outweighs board area; verify thermal performance at full load due to lower efficiency (~85%). |
| TPS54202DDCR | 2.5–6 V input range; 480 kHz switching; integrated FETs; 2 A rating; requires external compensation; smaller SOT-23-6 package. | Not compatible with 8–40 V inputs; unsuitable as direct replacement where wide VIN is required. | Use only in low-input-voltage applications (e.g., USB-powered devices); not a functional substitute for LM2675LD-ADJ/NOPB's industrial input range. |
Compared with LM2675LD-ADJ/NOPB, LM2575H-ADJ trades higher efficiency and compact layout for lower EMI and relaxed thermal design, while TPS54202DDCR offers higher integration and density but fails to meet the 8–40 V input requirement - making LM2675LD-ADJ/NOPB uniquely suited for wide-input industrial buck conversion.
Availability
LM2675LD-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and telecom power subsystems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature and load.
Supply support for LM2675LD-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 experience 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 and commercial power supply applications without requiring expert SMPS knowledge.
FAQ
What is the maximum output voltage achievable with LM2675LD-ADJ/NOPB?
The LM2675LD-ADJ/NOPB supports an adjustable output voltage range from 1.21 V to 37 V, set by an external resistor divider connected to the FB pin. This upper limit is constrained by the absolute maximum switch voltage rating (45 V) and internal reference accuracy; operation above 37 V risks violating safe operating area limits and is not characterized or guaranteed.
Does LM2675LD-ADJ/NOPB require external compensation components?
No, LM2675LD-ADJ/NOPB does not require external compensation components. It features patented internal frequency compensation optimized for stability with standard output capacitor ESR values, enabling reliable operation using only five external parts: input capacitor, output capacitor, inductor, catch diode, and FB divider resistors.
What is the purpose of the CB pin on LM2675LD-ADJ/NOPB?
CB (bootstrap capacitor) pin on LM2675LD-ADJ/NOPB provides gate drive voltage for the internal high-side DMOS switch. A 470 nF ceramic capacitor must be connected between CB and VSW to generate the boosted voltage needed to fully enhance the high-side FET - omission or incorrect value causes poor regulation or failure to start.
Can LM2675LD-ADJ/NOPB operate with an input voltage below 8 V?
No, LM2675LD-ADJ/NOPB has a minimum recommended input voltage of 6.5 V but is only specified for stable operation from 8 V to 40 V. Below 8 V, startup may fail, regulation degrades, and current limit behavior becomes unpredictable - TI does not characterize or guarantee performance below 8 V.
How does the ON/OFF pin function on LM2675LD-ADJ/NOPB?
The ON/OFF pin on LM2675LD-ADJ/NOPB is a TTL-compatible enable input: driving it ≥1.4 V (typical) enables regulation, while pulling it ≤0.8 V places the device in low-power shutdown with 50 μA standby current. The pin can be left floating to default-enable, but must never be left unterminated in noisy environments due to susceptibility to false triggering.
LM2675LD-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:
- 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:
- 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/NOPB FAQ
1.How can I place an order for LM2675LD-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675LD-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 LM2675LD-ADJ/NOPB reliable?
The price and inventory of LM2675LD-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 LM2675LD-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675LD-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675LD-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675LD-ADJ/NOPB?
LM2675LD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675LD-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 LM2675LD-ADJ/NOPB?
For technical support, including LM2675LD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675LD-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2675LD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675LD-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 LM2675LD-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675LD-ADJ/NOPB?
All LM2675LD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675LD-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 LM2675LD-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2675LD-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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