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Texas Instruments LM2675M-3.3/NOPB
- Part No.:
- LM2675M-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2675M-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:821
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Product details
Overview
LM2675M-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 or preregulator in industrial power supplies, embedded controllers, and point-of-load converters.
For engineers reviewing the LM2675M-3.3/NOPB datasheet, LM2675M-3.3/NOPB pinout, LM2675M-3.3/NOPB application, or LM2675M-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 LM2675M-3.3/NOPB integrates a DMOS high-side power switch, internal frequency compensation, and a 260kHz oscillator to implement a complete synchronous-buck topology without requiring external timing components. Its feedback loop regulates output by comparing FB pin voltage to an internal 1.21V reference - for the fixed 3.3V version, FB is shorted directly to VOUT.
It operates in continuous conduction mode up to 1A load, features cycle-by-cycle current limiting (1.25–2.1A typical), thermal shutdown, and supports low-power standby via TTL-level ON/OFF pin control with 50μA typical quiescent current in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line/load/temperature - ensures stable logic supply for microcontrollers and FPGAs without external resistor divider. |
| Max Output Current | 1A continuous - supports single-rail digital subsystems or sensor interface rails without derating at 25°C. |
| Input Voltage Range | 8V to 40V - accommodates unregulated 12V/24V industrial bus inputs with margin for ripple and transients. |
| Switching Frequency | 260kHz fixed - enables use of compact 22–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 86% typical at 12VIN/3.3VOUT/1A - minimizes thermal load; PCB copper traces suffice as sole heatsink under full load. |
| Quiescent Current | 3.6mA active, 50μA standby - enables low-power wake-on-event designs when paired with microcontroller-controlled ON/OFF pin. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and under-voltage lockout - prevents damage during overload, short-circuit, or cold-start conditions. |
Pinout & Package
LM2675M-3.3/NOPB is supplied in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed thermal pad not present (unlike WSON variants). 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. |
| 2,3 - NC | No-connect | Unbonded pins; must remain floating - no routing or soldering required. |
| 4 - FB | Feedback sense input | Internally tied to output for fixed 3.3V version; shorted directly to VOUT - no external resistors needed. |
| 5 - ON/OFF | Enable control input | TTL-compatible; ≥1.4V = active regulation, ≤0.8V = shutdown with 50μA IQ; pull-up resistor recommended if microcontroller-driven. |
| 6 - GND | Power ground | Main return path for input/output capacitors and IC substrate; requires low-inductance connection to system ground plane. |
| 7 - VIN | Input supply | Accepts 8–40V unregulated input; bypass with 22μF tantalum close to pin to suppress high-frequency switching noise. |
| 8 - VSW | Switch node output | Drives external catch diode anode and inductor; high dv/dt node - minimize trace area and avoid routing near sensitive analog signals. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external MOSFET and driver; RDS(on) = 0.3Ω max ensures <150mW conduction loss at 1A. |
| Patented internal frequency compensation | Enables stable loop response with only 5 external components - no external compensation network required. |
| Fixed 3.3V output configuration | FB pin internally connected to output - removes resistor divider error sources and simplifies BOM for standard logic rail generation. |
| TTL-compatible ON/OFF control | Direct interfacing with 3.3V/5V microcontrollers; 50μA shutdown current enables battery-backed systems to retain >1-year shelf life. |
| Thermal shutdown + current limit | Self-protecting under fault: limits peak switch current to 2.1A and disables switching above 150°C junction temperature. |
Applications
| Industrial PLC I/O Module Power | Embedded Microcontroller Core Supply |
|---|---|
Use Scenario: Providing isolated 3.3V rail for digital I/O conditioning circuits in programmable logic controller backplanes with 24V field-side input. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V bus to clean 3.3V for FPGA configuration, level-shifting buffers, and optocoupler drivers. Use Value: Delivers 1A at 86% efficiency with no heatsink, reducing board area and enabling conformal coating over entire module. | Use Scenario: Generating core voltage for ARM Cortex-M4 microcontrollers in battery-powered edge sensors operating from 12V automotive or solar inputs. IC Role / Device Role / Timing Role: Main DC-DC converter supplying VDD_CORE, with ON/OFF pin controlled by MCU's low-power sleep state machine. Use Value: 50μA standby current extends battery runtime; 260kHz switching avoids AM radio band interference in wireless sensor nodes. |
| Medical Diagnostic Instrument Pre-regulator | Test & Measurement Equipment Auxiliary Rail |
Use Scenario: Stepping down 40V intermediate bus to 3.3V for ADC reference buffers and precision op-amp biasing in portable ultrasound front-ends. IC Role / Device Role / Timing Role: High-PSRR preregulator feeding linear regulators that supply ultra-low-noise analog signal chains. Use Value: ±1.5% output tolerance and low output ripple (<20mVpp) preserve 16-bit ADC accuracy without additional filtering. | Use Scenario: Powering FPGA configuration memory and USB PHY interfaces in benchtop oscilloscopes using 12V/24V lab supply inputs. IC Role / Device Role / Timing Role: Fixed-output buck stage providing robust 3.3V rail tolerant to input transients and load steps up to 1A. Use Value: Fast load transient response (50μs recovery) maintains digital logic integrity during FPGA reconfiguration bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675SX-3.3/NOPB | Same silicon, tape-and-reel packaging (SOIC-8); identical electrical specs and pinout. | No functional difference - optimized for automated SMT assembly vs. tube-packaged M-variant. | Select LM2675SX-3.3/NOPB for high-volume production; LM2675M-3.3/NOPB for prototyping or low-volume builds. |
| TPS5430DR | 3A output, 500kHz switching, wider 5.5–36V input range; requires external compensation and more components. | Better suited for higher-current or space-constrained designs where efficiency >92% and smaller inductors are critical. | Choose TPS5430DR only if >1A load or tighter input range is required; LM2675M-3.3/NOPB remains optimal for simplicity and cost-sensitive 1A applications. |
Compared with LM2675SX-3.3/NOPB, LM2675M-3.3/NOPB offers identical performance in tube packaging for manual or semi-automated assembly, while TPS5430DR trades design simplicity for higher current and frequency - making LM2675M-3.3/NOPB the preferred choice for cost-effective, low-component-count 1A 3.3V conversion.
Availability
LM2675M-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller power rails, medical diagnostic instruments, test equipment auxiliary supplies, and battery-backed sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for LM2675M-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 engineers needing robust, easy-to-implement DC-DC solutions with minimal external components and proven reliability in industrial and embedded environments.
FAQ
What is the maximum input voltage rating for LM2675M-3.3/NOPB?
The absolute maximum input voltage for LM2675M-3.3/NOPB is 45V, but the recommended operating range is 8V to 40V per TI SNVS129G. Operating continuously above 40V risks exceeding internal DMOS breakdown limits and voiding parametric guarantees. For 48V automotive or telecom applications, a pre-regulator stage is required before LM2675M-3.3/NOPB.
Does LM2675M-3.3/NOPB require an external feedback resistor divider?
No - LM2675M-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 would disrupt regulation. Only adjustable versions (e.g., LM2675MX-ADJ/NOPB) require a resistor divider between VOUT, FB, and GND.
Can LM2675M-3.3/NOPB be used in discontinuous conduction mode (DCM)?
Yes - LM2675M-3.3/NOPB automatically transitions into DCM at light loads (<300mA typical), reducing switching losses and improving light-load efficiency. The device maintains regulation across CCM and DCM without external mode control; waveforms and transient response differ per Figure 5-16 in the datasheet.
What thermal considerations apply to LM2675M-3.3/NOPB in SOIC-8 package?
LM2675M-3.3/NOPB in SOIC-8 has RθJA = 105°C/W on a standard 4-layer JEDEC board. With 1A load and 86% efficiency, power dissipation is ~0.6W - resulting in ~63°C rise above ambient. No heatsink is needed if ambient stays below 62°C; however, adding 1 in² copper pour under the IC reduces RθJA significantly and improves long-term reliability.
Is LM2675M-3.3/NOPB RoHS-compliant and lead-free?
Yes - LM2675M-3.3/NOPB carries the "/NOPB" suffix, indicating lead-free (Pb-free) and RoHS-compliant construction per Texas Instruments' environmental standards. The SOIC-8 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements.
LM2675M-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2675M-3.3/NOPB FAQ
1.How can I place an order for LM2675M-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675M-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 LM2675M-3.3/NOPB reliable?
The price and inventory of LM2675M-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 LM2675M-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675M-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675M-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675M-3.3/NOPB?
LM2675M-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675M-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 LM2675M-3.3/NOPB?
For technical support, including LM2675M-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675M-3.3/NOPB requirements.
6.How does Aetrix verify that LM2675M-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675M-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 LM2675M-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675M-3.3/NOPB?
All LM2675M-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675M-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 LM2675M-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2675M-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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