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Texas Instruments LM2674MX-3.3/NOPB
- Part No.:
- LM2674MX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674MX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,405
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Product details
Overview
LM2674MX-3.3/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering 500mA at fixed 3.3V output, operating from 8V–40V input with 260kHz fixed-frequency switching, ±1.5% output voltage tolerance, and integrated 0.25Ω DMOS switch - used in industrial power rails, embedded system pre-regulation, and distributed supply architectures.
For engineers reviewing the LM2674MX-3.3/NOPB datasheet, LM2674MX-3.3/NOPB pinout, LM2674MX-3.3/NOPB application, or LM2674MX-3.3/NOPB equivalent, key selection criteria include input voltage range (6.5–40V), thermal shutdown protection, TTL-compatible enable control, efficiency up to 90% at 12VIN/500mA, and SOIC-8 package compatibility with standard PCB layout practices.
Technical Context
The LM2674MX-3.3/NOPB implements a current-mode controlled buck topology with internal frequency compensation and a fixed 260kHz oscillator, enabling stable regulation without external loop compensation. Its internal high-side DMOS switch features 0.25Ω RDS(ON) at 25°C and integrates cycle-by-cycle current limiting plus thermal shutdown for fault protection.
It operates in two functional modes: active mode (ON/OFF ≥1.4V) delivers regulated 3.3V output with typical 3.6mA quiescent current, and shutdown mode (ON/OFF <1.4V) reduces standby current to 50μA while disabling switching and disconnecting the output stage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line/load/temperature - ensures stable logic rail compliance for 3.3V microcontrollers and FPGAs. |
| Max Output Current | 500mA DC - supports moderate-power peripherals including sensors, ADCs, and communication interfaces. |
| Input Voltage Range | 6.5V to 40V - accommodates wide-input industrial supplies, automotive battery variations, and unregulated DC sources. |
| Switching Frequency | 260kHz fixed - enables use of compact, low-cost 22–68μH inductors and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω typical - minimizes conduction loss at full load, contributing to >90% efficiency at 12VIN/500mA. |
| Quiescent Current | 3.6mA typical - balances light-load efficiency and fast startup response in always-on systems. |
| Standby Current | 50μA typical - enables ultra-low-power sleep states in battery-backed or energy-conscious designs. |
| Oscillator Tolerance | ±10% - allows predictable filter design margins without requiring precision timing components. |
Pinout & Package
LM2674MX-3.3/NOPB is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed pad grounded for thermal performance. Pin 1 is CB (bootstrap capacitor), Pin 4 is FB (internally connected to output for fixed 3.3V version), Pin 5 is ON/OFF (TTL-compatible enable), Pin 6 is GND, Pin 7 is VIN, and Pin 8 is VSW (switch node).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Supplies gate drive voltage for internal high-side DMOS switch; requires 10nF ceramic capacitor between CB and VSW. |
| FB (Pin 4) | Feedback sense input | Internally tied to output for fixed 3.3V version - no external divider needed; open or misconnected FB causes regulation failure. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible logic input; ≥1.4V enables operation, <0.8V disables switching and reduces IQ to 50μA. |
| GND (Pin 6) | Power ground | Main return path for input/output capacitors and switch current; must be short, low-impedance connection to minimize noise and thermal rise. |
| VIN (Pin 7) | Input supply | Connects to unregulated DC source (6.5–40V); requires local high-frequency bypass capacitor (e.g., 22μF tantalum) with minimal trace length. |
| VSW (Pin 8) | Switch node output | Drives external catch diode and inductor; high dv/dt node requiring tight layout, ground shielding, and minimized parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS switch | 0.25Ω RDS(ON) eliminates need for external MOSFET and simplifies BOM while maintaining >90% efficiency at full load. |
| Fixed 3.3V output | No external feedback resistors required - reduces component count, layout area, and calibration risk in space-constrained designs. |
| Thermal + current protection | Auto-recovering thermal shutdown and cycle-by-cycle current limit prevent damage during overload, short-circuit, or high-ambient conditions. |
| Simple external design | Only five external components needed (input cap, output cap, inductor, catch diode, bootstrap cap) - accelerates prototyping and reduces design validation effort. |
| TTL shutdown interface | Direct logic-level control with 50μA standby current enables seamless integration into microcontroller-based power sequencing schemes. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Generating clean 3.3V rail from 24V factory bus for PLC I/O modules and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated DC power with high efficiency and thermal robustness in enclosed enclosures. Use Value: Eliminates need for heatsinks due to >90% efficiency and copper-trace-only thermal dissipation, reducing system size and cost. | Use Scenario: Converting 12V intermediate rail to 3.3V for ARM Cortex-M4 MCU, Ethernet PHY, and SPI flash memory in edge gateway devices. IC Role / Device Role / Timing Role: High-efficiency preregulator preceding LDOs to reduce heat generation and improve overall power system efficiency. Use Value: Delivers 500mA at 3.3V with only 3.6mA quiescent current, extending runtime in always-on edge nodes. |
| Automotive Body Control Module | Test & Measurement Equipment |
Use Scenario: Powering 3.3V CAN transceivers and microcontrollers in under-hood BCMs exposed to 40V load-dump transients. IC Role / Device Role / Timing Role: Input-tolerant buck converter handling wide 6.5–40V input range and protecting downstream logic from battery fluctuations. Use Value: Withstands 45V absolute max input rating and includes thermal shutdown, ensuring reliability in harsh automotive environments. | Use Scenario: Providing stable 3.3V supply for precision ADCs, DACs, and FPGA configuration in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, tightly regulated DC source minimizing supply-induced measurement error and jitter in analog front-ends. Use Value: ±1.5% output tolerance and excellent line/load regulation maintain reference accuracy across varying input and load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675MX-3.3/NOPB | Same pinout, 1A output current, higher RDS(ON) (0.35Ω), identical 260kHz frequency and protection features. | Supports higher-current loads (e.g., multi-peripheral SoM designs) but requires larger inductor and thermal margining. | Select when >500mA load current is required and board space allows for upgraded magnetics and thermal layout. |
| TPS54331DR | Synchronous buck, 3A output, 570kHz switching, adjustable output, smaller 8-pin SOIC package with integrated high-/low-side FETs. | Enables higher efficiency at light loads and smaller solution size, but requires external feedback resistors and more complex loop compensation. | Select when efficiency above 95%, footprint reduction, or programmable output voltage are prioritized over design simplicity. |
Compared with LM2675MX-3.3/NOPB, the LM2674MX-3.3/NOPB offers lower conduction loss and simpler thermal management for 500mA loads; compared with TPS54331DR, it trades higher light-load efficiency and smaller size for reduced design complexity and fixed-output ease-of-use.
Availability
LM2674MX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2674MX-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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers needing robust, easy-to-implement DC-DC conversion with minimal external components and proven field reliability in industrial and automotive applications.
FAQ
What is the maximum input voltage rating for LM2674MX-3.3/NOPB?
The LM2674MX-3.3/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 6.5V to 40V. Exceeding 45V risks permanent damage. For automotive applications subject to load dump, ensure transient clamping or filtering upstream of the LM2674MX-3.3/NOPB input to stay within this limit.
Does LM2674MX-3.3/NOPB require external feedback resistors?
No - the LM2674MX-3.3/NOPB is a fixed-output variant with internal feedback network configured for 3.3V. Pin 4 (FB) is internally connected to the output; adding external resistors will disrupt regulation. For adjustable versions, external resistor dividers are required, but not for LM2674MX-3.3/NOPB.
What is the thermal performance of LM2674MX-3.3/NOPB in SOIC-8 package?
In the SOIC-8 (D) package, LM2674MX-3.3/NOPB has a junction-to-ambient thermal resistance (RθJA) of 105°C/W with ~1 in² copper pour. At 500mA output and 12V input, typical power dissipation is ~350mW, resulting in ~37°C junction rise above ambient - well within the 125°C max operating junction temperature.
Can LM2674MX-3.3/NOPB be synchronized to an external clock?
No - the LM2674MX-3.3/NOPB uses an internal fixed-frequency 260kHz oscillator with ±10% tolerance and does not support external synchronization. For synchronizable alternatives, consider TI's TPS54331DR or newer SIMPLE SWITCHER® devices with SYNC pin functionality.
What type of catch diode is recommended for LM2674MX-3.3/NOPB?
A Schottky diode rated ≥3.3A peak forward current and ≥50V reverse voltage is recommended - e.g., IR 30WQ05F or equivalent. Schottky diodes minimize forward voltage drop and switching losses, directly improving efficiency and thermal performance. Avoid standard PN diodes due to excessive reverse recovery losses.
LM2674MX-3.3/NOPB 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:
- 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:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2674MX-3.3/NOPB FAQ
1.How can I place an order for LM2674MX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674MX-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 LM2674MX-3.3/NOPB reliable?
The price and inventory of LM2674MX-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 LM2674MX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674MX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674MX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674MX-3.3/NOPB?
LM2674MX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674MX-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 LM2674MX-3.3/NOPB?
For technical support, including LM2674MX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674MX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2674MX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674MX-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 LM2674MX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674MX-3.3/NOPB?
All LM2674MX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674MX-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 LM2674MX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2674MX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2674MX-3.3/NOPB Tags
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