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Texas Instruments LM2675N-3.3/NOPB
- Part No.:
- LM2675N-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2675N-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,313
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Product details
Overview
LM2675N-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC 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 up to 86% efficiency at 12VIN/1A. It serves as a primary power conversion stage in industrial control modules requiring compact, high-efficiency local regulation.
For engineers reviewing the LM2675N-3.3/NOPB datasheet, LM2675N-3.3/NOPB pinout, LM2675N-3.3/NOPB application, or LM2675N-3.3/NOPB equivalent, key selection criteria include its 8-pin SOIC package, integrated DMOS power switch, TTL-compatible ON/OFF control, thermal shutdown protection, and minimal external component count (5 total).
Technical Context
The LM2675N-3.3/NOPB integrates a DMOS high-side power switch, internal 260kHz oscillator, patented frequency compensation, and feedback error amplifier. Its fixed 3.3V output eliminates external resistor divider requirements-FB pin is internally connected to output for regulation.
It operates in continuous conduction mode up to 1A load, features cycle-by-cycle current limiting (1.25–2.1A), thermal shutdown, and supports TTL-level enable control via ON/OFF pin with 50μA standby current. Input voltage range (6.5V–40V) and dropout behavior are defined by minimum duty cycle (95%) and RDS(ON) (0.25Ω typical).
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 without trimming. |
| Max Output Current | 1A continuous - supports single-rail powering of ARM Cortex-M4-based edge nodes or sensor interface ASICs. |
| Input Voltage Range | 6.5V to 40V - accommodates 12V/24V industrial bus inputs with margin for transients and ripple. |
| Switching Frequency | 260kHz fixed - enables use of compact 33–68μH shielded inductors and reduces EMI compared to lower-frequency buck converters. |
| Efficiency | 86% at 12VIN/1A/3.3VOUT - minimizes thermal rise on PCB; copper traces suffice as heatsink per TI thermal data. |
| Quiescent Current | 3.6mA active, 50μA standby - supports low-power wake-on-event designs when paired with microcontroller-controlled ON/OFF pin. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload or short-circuit without external circuitry. |
Pinout & Package
LM2675N-3.3/NOPB uses an 8-pin SOIC (D package), 4.9mm × 6mm body, with exposed pad grounded for thermal performance. Pin functions are validated per TI SNVS129G Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap capacitor connection | Connects 470nF ceramic capacitor between CB and VSW to drive high-side DMOS gate; critical for proper switch turn-on. |
| 4 - FB | Feedback sense input | Internally tied to output for fixed 3.3V version - no external divider required; floating or misconnection causes regulation failure. |
| 5 - ON/OFF | Enable control input | TTL-compatible; ≥1.4V enables regulator, ≤0.8V disables with 50μA standby current - ideal for MCU GPIO control. |
| 6 - GND | Power ground | Main return path for input/output capacitors and inductor; must be low-impedance connection to system ground plane. |
| 7 - VIN | Input supply | Accepts 6.5–40V DC; requires local 22μF tantalum bypass capacitor placed adjacent to pin with short trace to GND. |
| 8 - VSW | Switch node output | Drives external inductor and Schottky catch diode; high dv/dt node - requires tight layout and minimized loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | RDS(ON) = 0.25Ω typical - eliminates need for external MOSFET and driver, reducing BOM count and layout complexity. |
| Fixed-frequency 260kHz operation | Enables predictable EMI filtering and consistent inductor sizing - avoids subharmonic oscillation without external compensation. |
| Minimal external components | Only 5 required: input cap, output cap, inductor, Schottky diode, bootstrap cap - accelerates design cycle and improves reliability. |
| TTL shutdown with low IQ | 50μA standby current - allows battery-backed systems to maintain >1-year shelf life while retaining fast wake-up capability. |
| Internal thermal shutdown | Activates at TJ ≈ 150°C - protects against sustained overload or poor heatsinking without external thermal sensor or circuitry. |
Applications
| Industrial PLC I/O Module Power | Embedded Gateway 3.3V Rail |
|---|---|
Use Scenario: Local 3.3V supply generation from 24V field bus in DIN-rail mounted programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3V for FPGA configuration, ADC reference, and digital isolator biasing. Use Value: 86% efficiency at 24V→3.3V/500mA reduces heat buildup in sealed enclosures; SOIC package fits constrained board space. |
Use Scenario: Standalone 3.3V rail for ARM-based wireless gateway handling Modbus TCP and LoRaWAN protocol stacks. IC Role / Device Role / Timing Role: Main system regulator powering CPU core, Ethernet PHY, and RF transceiver - enabled/disabled via host MCU GPIO. Use Value: 50μA shutdown current extends battery backup runtime; 260kHz switching allows small 4.7×4.7mm inductor footprint. |
| Medical Sensor Hub Supply | Automotive Body Control Subsystem |
Use Scenario: Compact 3.3V supply for portable EEG/ECG sensor hub with analog front-end and BLE SoC. IC Role / Device Role / Timing Role: Single-stage buck converter replacing linear regulator to meet thermal limits in plastic enclosure. Use Value: Eliminates need for heatsink; ±1.5% output tolerance ensures accurate ADC reference and stable BLE radio operation. |
Use Scenario: Secondary 3.3V rail derived from 12V vehicle battery for LIN bus transceivers and door module microcontrollers. IC Role / Device Role / Timing Role: Load-switched buck regulator activated only during ignition-on state to minimize quiescent drain. Use Value: Withstands 40V load dump transients; thermal shutdown prevents latch-up during cabin temperature extremes (–40°C to +125°C). |
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 8-pin PDIP package (9.81mm × 9.43mm); higher RθJA (95°C/W vs. 105°C/W for SOIC). | Preferred for through-hole prototyping or legacy board rework where SOIC footprint unavailable. | Select only if manual assembly or socketing required; thermal performance degrades above 600mA in still air. |
| TPS5430DDAR | 3A output, 500kHz switching, wider 5.5–36V input, but requires external compensation and more components. | Suitable for higher-current or tighter transient-response applications where 1A is insufficient. | Choose when scaling beyond 1A or needing faster load-step response; not drop-in - redesign of loop compensation and layout required. |
Compared with LM2675M-3.3/NOPB, the LM2675N-3.3/NOPB offers superior thermal resistance in SOIC packaging and smaller footprint; versus TPS5430DDAR, it trades higher current and speed for simplicity, lower cost, and proven stability with just five external parts.
Availability
LM2675N-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded gateways, and medical sensor hubs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2675N-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 belongs to TI's SIMPLE SWITCHER® family - designed specifically for engineers needing robust, easy-to-implement DC-DC solutions with minimal external components and guaranteed performance across industrial temperature ranges.
FAQ
What is the maximum input voltage rating for the LM2675N-3.3/NOPB?
The absolute maximum input voltage for the LM2675N-3.3/NOPB is 45V, but the recommended operating range is 6.5V to 40V per TI SNVS129G. Sustained operation above 40V risks exceeding internal DMOS breakdown limits and may trigger thermal shutdown. For automotive applications with 12V battery systems, this provides ample headroom for load-dump transients.
Does the LM2675N-3.3/NOPB require an external feedback resistor network?
No - the LM2675N-3.3/NOPB is the fixed 3.3V output variant, so the FB pin is internally connected to the output. External resistors are unnecessary and must not be added; doing so disrupts regulation. The FB pin should remain unconnected except for optional noise-filtering capacitor to ground (≤100pF).
Can the LM2675N-3.3/NOPB be used in discontinuous conduction mode (DCM)?
Yes - the LM2675N-3.3/NOPB naturally transitions into DCM at light loads (<200mA typical at 12VIN). Its current-mode control and fixed frequency ensure stable operation in both CCM and DCM, with documented waveforms and transient response in TI's datasheet Figure 5-16 and Figure 5-18.
What is the thermal resistance (RθJA) of the LM2675N-3.3/NOPB in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for the LM2675N-3.3/NOPB in 8-pin SOIC (D package) is 105°C/W, measured on a standard 4-layer JEDEC board with ~1 in² copper around the leads. Adding thermal vias under the exposed pad further reduces effective RθJA, enabling full 1A operation at ambient temperatures up to 70°C.
Is WEBENCH® design support available for the LM2675N-3.3/NOPB?
Yes - TI's WEBENCH® Power Designer fully supports the LM2675N-3.3/NOPB. Users can input target VIN, VOUT, and IOUT to generate complete schematics, select optimized off-the-shelf inductors/diodes/capacitors, simulate efficiency and thermal performance, and export CAD-ready layouts - all validated against the LM2675N-3.3/NOPB's published electrical characteristics.
LM2675N-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2675N-3.3/NOPB FAQ
1.How can I place an order for LM2675N-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675N-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 LM2675N-3.3/NOPB reliable?
The price and inventory of LM2675N-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 LM2675N-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675N-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675N-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675N-3.3/NOPB?
LM2675N-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675N-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 LM2675N-3.3/NOPB?
For technical support, including LM2675N-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675N-3.3/NOPB requirements.
6.How does Aetrix verify that LM2675N-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675N-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 LM2675N-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675N-3.3/NOPB?
All LM2675N-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675N-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 LM2675N-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2675N-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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