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Texas Instruments LM2675LD-3.3/NOPB
- Part No.:
- LM2675LD-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2675LD-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
LM2675LD-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering 1A output current at a fixed 3.3V output, operating from 8V–40V input, with ±1.5% output voltage tolerance, 260kHz fixed-frequency operation, and integrated DMOS power switch. It serves as a high-efficiency (>90%) primary power stage in industrial control, embedded systems, and point-of-load conversion.
For engineers reviewing the LM2675LD-3.3/NOPB datasheet, LM2675LD-3.3/NOPB pinout, LM2675LD-3.3/NOPB application, or LM2675LD-3.3/NOPB equivalent, key selection criteria include its 3.3V fixed output, SOIC-8 package compatibility, thermal shutdown protection, TTL-compatible enable control, and minimal external component count (5 total).
Technical Context
The LM2675LD-3.3/NOPB integrates a DMOS high-side power switch, internal frequency compensation, and a 260kHz oscillator to enable stable buck regulation without external compensation. Its feedback loop maintains regulation by comparing the output voltage-directly connected to the FB pin in fixed-output mode-to an internal 1.21V reference.
It operates in continuous conduction mode up to 1A load, employs cycle-by-cycle current limiting (1.25–2.1A typical), and enters low-power shutdown (<100μA standby) when the ON/OFF pin falls below 1.4V. Thermal shutdown and overcurrent protection are fully integrated, eliminating need for external fault management circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line/load/temperature - ensures stable logic supply for 3.3V microcontrollers and FPGAs without external resistor divider. |
| Max Output Current | 1A continuous - supports single-rail powering of mid-power digital subsystems (e.g., MCU + peripherals) without heatsinking beyond PCB copper. |
| Input Voltage Range | 8V to 40V - enables direct use with 12V/24V industrial rails and battery-backed systems after basic pre-regulation. |
| Switching Frequency | 260kHz fixed - allows use of compact 33–68μH shielded inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 86% at VIN=12V, IOUT=1A - minimizes power loss and board heating in space-constrained enclosures. |
| Quiescent Current | 3.6mA typical active, 50–100μA standby - supports low-power wake-on-event architectures with fast enable response. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and under-voltage lockout - provides autonomous fault recovery without system-level supervision. |
Pinout & Package
LM2675LD-3.3/NOPB is supplied in an 8-pin SOIC (D-package), 4.9mm × 6mm body with gull-wing leads. Thermal performance relies on PCB copper area adjacent to GND pins; no external heatsink required under full load at ≤125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 470nF ceramic capacitor between CB and VSW to bias high-side gate driver; critical for MOSFET turn-on integrity. |
| FB | Feedback sense input | Internally tied to output capacitor in fixed-3.3V version; open-circuit or misconnection causes overvoltage failure. |
| GND | Power ground | Primary return path for input/output capacitors and inductor; must be short, low-impedance trace to minimize noise and voltage spikes. |
| ON/OFF | Enable control input | TTL-compatible logic input: ≥1.4V = active regulation; ≤0.8V = shutdown with <100μA quiescent draw. |
| VIN | Main power input | Accepts 8–40V unregulated DC; requires local 22μF tantalum or low-ESR ceramic bypass within 5mm of pin. |
| VSW | Switch node output | Drives external inductor and catch diode; high dv/dt node requiring tight layout and guard ring to reduce EMI. |
| NC | No-connect | Pins 2 and 3 are unused; must remain unconnected and unstubbed to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components-no loop compensation design or stability analysis required. |
| Fixed 3.3V output configuration | Removes feedback resistor network, improving accuracy, reducing part count, and avoiding drift-related output error. |
| WEBENCH® Power Designer support | Generates complete schematics, bill-of-materials, efficiency plots, and thermal simulations directly from TI's online tool. |
| High-efficiency architecture | 86%+ efficiency at full load enables self-cooling via PCB copper traces-no heatsink or airflow needed in most applications. |
Applications
| Industrial PLC I/O Module | Embedded Network Router |
|---|---|
Use Scenario: Powering isolated 3.3V logic rails for digital I/O expansion cards in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V field bus to clean, regulated 3.3V for FPGA configuration, level-shifting buffers, and RS-485 transceivers. Use Value: Delivers 1A at 86% efficiency with built-in current limiting-prevents cascade failures during shorted sensor wiring or ESD events on field lines. | Use Scenario: Generating 3.3V core supply for ARM-based SoC and Ethernet PHY in compact residential gateways. IC Role / Device Role / Timing Role: Point-of-load converter downstream of a 12V intermediate rail, providing low-noise, tightly regulated voltage for memory and interface logic. Use Value: Fixed 3.3V output eliminates resistor tolerance errors; 260kHz switching enables small 47μH inductor footprint compatible with 2-layer PCB constraints. |
| Medical Diagnostic Handheld | Automotive Body Control Module |
Use Scenario: Supplying 3.3V to low-power microcontroller, display driver, and analog front-end in portable ultrasound probe electronics. IC Role / Device Role / Timing Role: Main DC-DC regulator accepting wide-input 9–36V battery range and delivering stable 3.3V under dynamic load transients from pulsed imaging circuits. Use Value: ±1.5% output tolerance and fast transient response ensure reliable ADC reference and timing accuracy across temperature and battery discharge. | Use Scenario: Providing 3.3V for CAN controller, LIN transceiver, and EEPROM in under-hood body control units exposed to 12V automotive battery with load dump. IC Role / Device Role / Timing Role: Robust buck regulator with 40V absolute max input rating and thermal shutdown-survives ISO 7637-2 pulse 5a (load dump) when paired with TVS. Use Value: Integrated current limit and thermal protection prevent latch-up during motor stall or short-circuit faults in high-temperature engine bay environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675M-3.3/NOPB | Same electrical specs but in PDIP-8 package (9.81mm × 9.43mm); higher RθJA (95°C/W vs. 105°C/W for SOIC). | Used where through-hole assembly or manual prototyping is preferred; not suitable for dense SMT layouts. | Select LM2675M-3.3/NOPB only if PDIP footprint and hand-soldering are required; SOIC offers better thermal performance and smaller area. |
| LM2678SD-3.3/NOPB | Higher 5A output capability, same 3.3V fixed output, but uses 16-pin WSON package and requires different external component values. | Targets higher-current loads (e.g., multi-rail systems); not drop-in due to different pinout, layout, and inductor sizing. | Choose LM2678SD-3.3/NOPB only when >1A output is needed; LM2675LD-3.3/NOPB remains optimal for cost- and size-sensitive 1A designs. |
Compared with LM2675M-3.3/NOPB, the LM2675LD-3.3/NOPB offers superior thermal resistance in surface-mount form factor; versus LM2678SD-3.3/NOPB, it delivers identical 3.3V regulation at lower cost and simpler layout-ideal for 1A applications where headroom and footprint matter.
Availability
LM2675LD-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded networking, and medical diagnostics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2675LD-3.3/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 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 supplies.
FAQ
What is the maximum input voltage rating for LM2675LD-3.3/NOPB?
The LM2675LD-3.3/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 8V to 40V. Exceeding 40V continuously may trigger internal protection or reduce reliability; for automotive load-dump scenarios, pairing with a TVS diode clamping at ≤40V is advised. The device's 45V absolute max rating provides margin against transient spikes but is not intended for sustained operation.
Does LM2675LD-3.3/NOPB require an external feedback resistor network?
No, LM2675LD-3.3/NOPB does not require external feedback resistors. As a fixed 3.3V output variant, the FB pin is internally connected to the output, eliminating the need for a voltage-divider network. This simplifies design, improves output accuracy (±1.5% tolerance), and removes resistor drift and layout sensitivity-unlike adjustable versions such as LM2675MX-ADJ/NOPB which require precise R1/R2 selection.
How does the ON/OFF pin function on LM2675LD-3.3/NOPB?
The ON/OFF pin on LM2675LD-3.3/NOPB is a TTL-compatible enable input: driving it ≥1.4V (or leaving it floating) activates regulation, while pulling it ≤0.8V places the device in low-power shutdown with 50–100μA standby current. It is not inverted-no external pull-up is required. This pin supports system-level power sequencing and battery-saving modes without additional logic circuitry.
What package type is used for LM2675LD-3.3/NOPB?
LM2675LD-3.3/NOPB uses the 8-pin SOIC (D-package) with 4.9mm × 6mm body dimensions and standard gull-wing lead form. This surface-mount package supports automated assembly, offers moderate thermal performance (RθJA = 105°C/W on 1-inch² copper), and is pin-compatible with other SOIC-8 buck regulators-enabling layout reuse across TI's SIMPLE SWITCHER® portfolio.
Can LM2675LD-3.3/NOPB drive a 1A load continuously at 40°C ambient?
Yes, LM2675LD-3.3/NOPB can deliver 1A continuously at 40°C ambient when mounted on a standard 4-layer PCB with ≥1 inch² of 2-oz copper connected to GND pins. Its thermal design relies on PCB copper as the primary heatsink; efficiency of ~86% at 12V input yields ~140mW dissipation, well within safe junction limits (TJ ≤ 125°C). No external heatsink is required under these conditions.
LM2675LD-3.3/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2675LD-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675LD-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2675LD-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675LD-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675LD-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675LD-3.3/NOPB?
LM2675LD-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675LD-3.3/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-3.3/NOPB?
For technical support, including LM2675LD-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675LD-3.3/NOPB requirements.
6.How does Aetrix verify that LM2675LD-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675LD-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675LD-3.3/NOPB?
All LM2675LD-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675LD-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2675LD-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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