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Texas Instruments LM2675MX-3.3
- Part No.:
- LM2675MX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2675MX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,041
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Product details
Overview
LM2675MX-3.3 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 and up to 96% efficiency. It integrates a DMOS power MOSFET switch, fixed 260kHz oscillator, internal frequency compensation, and thermal/current protection-designed for compact, high-efficiency power conversion in industrial and embedded systems.
For engineers reviewing the LM2675MX-3.3 datasheet, LM2675MX-3.3 pinout, LM2675MX-3.3 application, or LM2675MX-3.3 equivalent, key selection considerations include its SOIC-8 package compatibility, 3.3V fixed-output regulation accuracy across –40°C to 125°C, low 50μA standby current in shutdown mode, and minimal external component count (only 5 required).
Technical Context
The LM2675MX-3.3 implements a synchronous-free buck topology using an integrated high-side DMOS FET switch and internal fixed-frequency PWM controller. Its 260kHz switching frequency enables use of small external inductors and capacitors while maintaining stable regulation under load transients up to 1A.
It employs internal voltage-mode control with patented frequency compensation, eliminating need for external loop compensation components. Feedback is internally connected for fixed 3.3V operation-no external resistor divider required-while FB pin remains accessible for monitoring or fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line, load, and temperature (–40°C to 125°C), enabling reliable logic-level rail generation without trimming. |
| Max Output Current | 1A continuous, supporting microcontroller cores, FPGA I/O banks, and industrial sensors without external current boosting. |
| Input Voltage Range | 8V to 40V, allowing direct operation from unregulated 12V/24V industrial rails or automotive battery inputs with transient headroom. |
| Switching Frequency | 260kHz fixed, reducing EMI filtering burden and enabling use of standard 47–68μH shielded inductors with low core loss. |
| Efficiency | Up to 96% at full load (VIN=12V), minimizing thermal dissipation-PCB copper traces suffice as heatsink per TI design guidance. |
| Standby Current | 50μA typical in shutdown (ON/OFF = 0V), supporting low-power wake-on-event architectures in battery-backed systems. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limiting, and frequency foldback during short-circuit-ensuring robust fault recovery without latch-up. |
Pinout & Package
LM2675MX-3.3 is supplied in an 8-pin SOIC (D package), 4.9mm × 6mm body size, 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 FET gate; critical for proper switch turn-on. |
| 2 NC | No connect | Internally unused; must remain unconnected and unrouted on PCB to avoid noise coupling or parasitic effects. |
| 3 NC | No connect | Internally unused; leave floating-no tie to GND or other nets. |
| 4 FB | Feedback sense input | Internally tied to output for fixed 3.3V version; monitor point for output voltage verification or fault detection. |
| 5 ON/OFF | Enable control input | TTL-compatible; ≥1.4V enables regulation, ≤0.8V disables output and reduces quiescent current to 50μA. |
| 6 GND | Power ground | Main return path for input/output capacitors and inductor; requires low-impedance connection to system ground plane. |
| 7 VIN | Input supply | Accepts 8–40V DC; bypass with 22μF tantalum capacitor placed adjacent to pin with shortest possible trace to GND. |
| 8 VSW | Switch node output | Drives external inductor and catch diode; high dv/dt node requiring tight layout, ground shielding, and minimal trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates external high-side MOSFET and driver, reducing BOM count and layout complexity for 1A buck designs. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components-no external compensation network required. |
| Fixed 3.3V output configuration | Internal feedback connection removes need for external resistor divider, improving accuracy and reducing board space. |
| TTL-compatible enable input | Allows direct interfacing with microcontroller GPIOs or logic-level control signals without level-shifting circuitry. |
| Thermal and current limit protection | Self-protecting under overload or ambient overheating-automatically recovers after fault removal without latch-up. |
Applications
| Industrial PLC I/O Power | Embedded Microcontroller Core Rail |
|---|---|
Use Scenario: Providing isolated 3.3V power to digital I/O modules in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V bus to clean, regulated 3.3V for FPGA configuration, optocoupler drivers, and ADC reference. Use Value: Delivers 1A with <1.5% output variation across –40°C to 85°C ambient, ensuring deterministic logic timing and analog measurement integrity. | Use Scenario: Supplying main core voltage to ARM Cortex-M4 microcontrollers in portable test equipment with battery backup. IC Role / Device Role / Timing Role: High-efficiency primary DC-DC converter stepping down 12V battery or adapter input to 3.3V MCU rail. Use Value: Achieves >90% efficiency at 500mA load, extending battery life while maintaining tight voltage regulation during dynamic CPU load changes. |
| Medical Sensor Signal Chain | Automotive Body Control Module |
Use Scenario: Generating low-noise 3.3V supply for precision analog front-ends in wearable ECG monitors powered by coin-cell or Li-ion. IC Role / Device Role / Timing Role: Fixed-output buck regulator feeding ADCs, op-amps, and low-power wireless transceivers. Use Value: Low 50μA shutdown current preserves battery charge during sleep; ±1.5% output tolerance ensures consistent sensor gain calibration. | Use Scenario: Powering CAN transceiver, EEPROM, and microcontroller peripherals in 12V automotive body control units. IC Role / Device Role / Timing Role: Robust 3.3V rail generator tolerant of cold-crank (6.5V) and load-dump (40V) transients per ISO 7637-2. Use Value: 8–40V input range and thermal protection ensure uninterrupted operation across full automotive voltage envelope without external TVS or LDO pre-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVT-3.3 | 52kHz switching frequency, higher dropout, lower efficiency (~85%), TO-220 or D2PAK package only. | Suitable for cost-sensitive, lower-density designs where board space and EMI are less constrained. | Select when thermal mass from larger package is acceptable and 260kHz EMI filtering is impractical. |
| TPS54331DR | 3.5–28V input, adjustable output, 3.5A capability, 570kHz frequency, smaller 8-pin SO PowerPAD package. | Better suited for higher-current or adjustable-voltage needs; requires external feedback resistors and compensation. | Choose when future design flexibility (voltage scaling) or >1A load margin is required-adds design complexity but improves scalability. |
Compared with LM2675MX-3.3, LM2575HVT-3.3 trades efficiency and frequency for ruggedness in high-temperature environments, while TPS54331DR offers higher current and frequency at the cost of fixed-output simplicity and increased external component count.
Availability
LM2675MX-3.3 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive body electronics requiring stable component supply, long-term lifecycle support, and production-grade traceability.
Supply support for LM2675MX-3.3 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, medical, and transportation applications where reliability and design simplicity are critical.
FAQ
What is the maximum input voltage rating for the LM2675MX-3.3?
The LM2675MX-3.3 has an absolute maximum input voltage rating of 45V, with recommended operating range from 8V to 40V. Operation within this 8–40V window ensures specified performance-including ±1.5% output tolerance and 1A load capability-across the full –40°C to 125°C junction temperature range. Exceeding 40V may trigger internal protection but is not guaranteed for continuous operation.
Does the LM2675MX-3.3 require external feedback resistors to set the output voltage?
No, the LM2675MX-3.3 does not require external feedback resistors. As a fixed 3.3V output variant, its internal feedback network is factory-trimmed and connected directly to the output. The FB pin is internally tied to the regulated output-making it ready-to-use with only five external components: input capacitor, output capacitor, inductor, catch diode, and bootstrap capacitor.
How does the ON/OFF pin function on the LM2675MX-3.3?
The ON/OFF pin on the LM2675MX-3.3 provides TTL-compatible enable control: applying ≥1.4V (typical) enables regulation, while ≤0.8V (typical) places the device in low-power shutdown mode with 50μA standby current. The pin can be left floating to default-enable the regulator. No pull-up resistor is required, simplifying interface with microcontrollers or logic gates.
What package type is used for the LM2675MX-3.3, and is thermal pad connection required?
The LM2675MX-3.3 uses the 8-pin SOIC (D package), 4.9mm × 6mm body size. It does not include an exposed thermal pad-unlike the WSON variant-so no DAP grounding is needed. Thermal performance relies on PCB copper area connected to GND pins 6 and 7; TI specifies RθJA = 105°C/W with ~1 in² of surrounding copper.
Can the LM2675MX-3.3 be used in automotive applications with load dump conditions?
Yes-the LM2675MX-3.3 supports input voltages up to 40V, covering ISO 7637-2 Load Dump Pulse 5a (up to 35V for 400ms) and Cold Crank (down to 6.5V). Combined with thermal shutdown and current limiting, it delivers robust operation in automotive body control modules. However, for sustained >40V transients, external clamping (e.g., TVS diode) is recommended per TI design guidelines.
LM2675MX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
LM2675MX-3.3 FAQ
1.How can I place an order for LM2675MX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675MX-3.3 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 LM2675MX-3.3 reliable?
The price and inventory of LM2675MX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675MX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2675MX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675MX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675MX-3.3?
LM2675MX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675MX-3.3 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 LM2675MX-3.3?
For technical support, including LM2675MX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675MX-3.3 requirements.
6.How does Aetrix verify that LM2675MX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2675MX-3.3 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 LM2675MX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2675MX-3.3?
All LM2675MX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2675MX-3.3, 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 LM2675MX-3.3 part is unused and in its original packaging.
Return procedure for LM2675MX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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