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Texas Instruments LM2674N-ADJ/NOPB
- Part No.:
- LM2674N-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2674N-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:938
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Product details
Overview
LM2674N-ADJ/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter IC delivering up to 500mA output current with ±1.5% output voltage tolerance, 260kHz fixed switching frequency, and 8V–40V input voltage range. It implements an internal 0.25Ω DMOS switch and supports adjustable output voltages from 1.21V to 37V via external resistor divider - used in industrial power supplies requiring compact, high-efficiency buck regulation.
For engineers reviewing the LM2674N-ADJ/NOPB datasheet, LM2674N-ADJ/NOPB pinout, LM2674N-ADJ/NOPB application, or LM2674N-ADJ/NOPB equivalent, key selection considerations include feedback reference accuracy (1.21V), thermal shutdown protection, TTL-compatible enable control, and SOIC-8 package compatibility with standard PCB layout practices for low-noise switching regulators.
Technical Context
The LM2674N-ADJ/NOPB integrates a fixed-frequency PWM controller, internal high-side DMOS switch, bootstrap driver, and precision 1.21V bandgap reference. Its feedback loop regulates output by comparing FB pin voltage against this internal reference, enabling precise programmable output via R1/R2 divider.
It operates in continuous conduction mode with cycle-by-cycle current limiting, thermal shutdown, and 50μA standby current in shutdown mode activated by pulling ON/OFF pin below 1.4V. The 260kHz oscillator allows use of small external inductors and capacitors while maintaining >90% efficiency at full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500mA maximum DC load - sufficient for powering microcontrollers, sensors, and analog circuitry without external current boosting. |
| Input Voltage Range | 8V to 40V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Switching Frequency | 260kHz fixed - enables compact LC filter design with standard off-the-shelf inductors and reduces EMI compared to lower-frequency alternatives. |
| Feedback Reference | 1.21V ±1.8% over temperature - sets output voltage accuracy when used with precision external resistors (R1/R2). |
| Output Voltage Range | 1.21V to 37V - programmable via resistor divider; supports both low-voltage logic rails and higher-voltage analog subsystems. |
| Quiescent Current | 3.6mA typical active, 50μA standby - minimizes no-load power loss in always-on or low-duty-cycle applications. |
| RDS(ON) | 0.25Ω typical at 25°C - limits conduction loss and self-heating under full 500mA load, enabling operation without heatsink on standard PCB copper. |
Pinout & Package
LM2674N-ADJ/NOPB uses an 8-pin SOIC (D-package) with 4.9mm × 6mm footprint and exposed pad not present - thermal performance relies on PCB copper area connected to GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap capacitor connection | Connects 10nF ceramic capacitor between CB and VSW to drive high-side FET gate above VIN; critical for proper switch turn-on. |
| 4 - FB | Feedback sense input | Monitors voltage divider midpoint; regulates output by holding FB = 1.21V - determines VOUT = 1.21V × (1 + R1/R2). |
| 5 - ON/OFF | Enable control input | TTL-compatible; ≥1.4V enables regulator, <0.8V disables it; internally pulled up to 7V - can be left floating for always-on operation. |
| 6 - GND | Power ground | Main return path for input/output capacitors and inductor; must be short, low-impedance connection to minimize noise and voltage drop. |
| 7 - VIN | Input supply | Accepts 8–40V DC; connects to high-frequency bypass capacitor (CIN); trace to CIN/GND must be shortest possible for stability. |
| 8 - VSW | Switch node output | Drains internal DMOS switch; connects to inductor and Schottky catch diode cathode - high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Patented frequency compensation eliminates need for external compensation network - simplifies design and improves stability across loads. |
| Thermal & current protection | Integrated thermal shutdown and cycle-by-cycle current limit (0.62–1.25A) prevent damage during overload, short-circuit, or elevated ambient conditions. |
| Low-component count | Requires only five external components (inductor, diode, input/output caps, bootstrap cap) - reduces BOM cost and board space vs. controller-based solutions. |
| High efficiency | Up to 96% peak efficiency - reduces heat generation and extends battery life in portable or thermally constrained applications. |
| WEBENCH® support | Fully integrated into TI's WEBENCH Power Designer - enables automated schematic generation, component selection, efficiency simulation, and thermal analysis. |
Applications
| Industrial Sensor Node Power | Programmable Logic Controller (PLC) I/O Module |
|---|---|
|
Use Scenario: Powers 3.3V or 5V microcontroller, ADC, and analog front-end in remote field sensor nodes powered from 24V DC industrial bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24V bus to stable low-voltage rail; provides regulated supply independent of bus fluctuations. Use Value: Delivers 500mA at >90% efficiency with minimal thermal rise on standard FR4, eliminating need for heatsinks or forced air in sealed enclosures. |
Use Scenario: Supplies isolated 5V or 12V auxiliary rails for digital I/O conditioning circuits in modular PLC backplanes operating from 24V or 48V DC input. IC Role / Device Role / Timing Role: Pre-regulator stage feeding linear regulators or isolated DC-DC modules - reduces dropout and heat dissipation in downstream stages. Use Value: Wide 8–40V input range accommodates varying bus voltages; ±1.5% output tolerance ensures accurate reference for analog signal conditioning. |
| Automotive Body Control Module (BCM) | Test & Measurement Equipment Supply |
|
Use Scenario: Generates 5V rail for microcontroller and CAN transceiver in 12V automotive BCMs subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Robust primary DC-DC converter handling input transients up to 40V; enables direct connection to vehicle battery with minimal front-end protection. Use Value: 260kHz switching avoids AM radio band interference; thermal shutdown protects against sustained overloads during fault conditions. |
Use Scenario: Provides clean, adjustable bias voltage (e.g., ±15V, 24V) for op-amp rails or DAC references in benchtop instruments with multi-rail requirements. IC Role / Device Role / Timing Role: Programmable output buck regulator supporting multiple voltage configurations via resistor change - replaces fixed-voltage parts in shared PCB designs. Use Value: 1.21V reference and wide 1.21–37V output range allow precise setting of non-standard rails; SOIC-8 package supports manual rework and prototyping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574H-ADJ | Higher 60V max input, 52kHz switching frequency, 500mA rating - larger magnetics required, lower efficiency at same output power. | Better suited for high-input-voltage applications (>40V) where size is less critical than voltage margin. | Choose LM2574H-ADJ only if input exceeds 40V; LM2674N-ADJ/NOPB offers superior efficiency and smaller solution size below 40V. |
| LMR14050ADJEVM | Synchronous buck, 40V max input, 500mA, 2.1MHz switching - requires fewer/external components but needs careful layout for EMI control. | Preferred for space-constrained designs needing ultra-small inductors and higher light-load efficiency. | Select LMR14050ADJEVM when PCB area is premium and 2.1MHz operation is acceptable; LM2674N-ADJ/NOPB remains optimal for cost-sensitive, noise-tolerant industrial use. |
Compared with LM2574H-ADJ and LMR14050ADJEVM, LM2674N-ADJ/NOPB delivers best-in-class balance of efficiency (up to 96%), simplicity (5 external parts), and ruggedness (thermal/current protection) in the 8–40V input range - making it ideal for industrial and automotive power rails where reliability and ease of implementation are prioritized over ultra-high frequency or synchronous rectification.
Availability
LM2674N-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2674N-ADJ/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 - serving industrial, automotive, and communications markets with high-reliability, production-ready silicon.
The LM2674 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for engineers seeking easy-to-use, highly integrated DC-DC solutions that minimize external component count while maintaining robust protection and predictable performance.
FAQ
What is the minimum input voltage required for stable operation of the LM2674N-ADJ/NOPB?
The LM2674N-ADJ/NOPB specifies a minimum recommended input voltage of 6.5V per its Recommended Operating Conditions table. Below this, regulation may fail or the internal oscillator may become unstable. For reliable startup and continuous operation across temperature, maintain VIN ≥ 6.5V - especially critical when regulating outputs near the upper end of the 1.21–37V range.
Can the LM2674N-ADJ/NOPB be used to generate negative output voltages?
Yes - the LM2674N-ADJ/NOPB supports positive-to-negative buck-boost conversion using an inverting topology. In this configuration, the IC regulates the magnitude of the negative output by sensing the inverted FB node. Required external components include a polarity-reversal inductor, diode, and capacitor arrangement detailed in TI's Application Report SLVA053. Output current capability remains ≤500mA.
What is the purpose of the CB pin on the LM2674N-ADJ/NOPB, and what capacitor value is recommended?
The CB pin on the LM2674N-ADJ/NOPB serves as the bootstrap capacitor connection for the high-side FET gate driver. A 10nF ceramic capacitor (X7R or C0G, rated ≥50V) must be placed directly between CB and VSW to ensure sufficient gate drive voltage above VIN. This capacitor replenishes charge lost during each switching cycle - incorrect value or placement causes erratic switching or failure to start.
How does the ON/OFF pin function on the LM2674N-ADJ/NOPB, and what is its threshold voltage?
The ON/OFF pin on the LM2674N-ADJ/NOPB enables or disables the regulator via TTL-level control. It has an internal 7V pull-up, so floating the pin defaults to ON. The turn-on threshold is 1.4V (min) at 25°C, dropping to 0.8V (min) over full temperature range. Pulling the pin below 0.8V places the device in shutdown mode, reducing quiescent current to 50μA typical.
Is the LM2674N-ADJ/NOPB RoHS-compliant and lead-free?
Yes - the LM2674N-ADJ/NOPB carries the "/NOPB" suffix, indicating it is lead-free and RoHS-compliant per TI's packaging standards. It uses matte tin lead finish on the SOIC-8 package and meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 - allowing unlimited floor life at ≤30°C/60% RH without baking prior to assembly.
LM2674N-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2674N-ADJ/NOPB FAQ
1.How can I place an order for LM2674N-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674N-ADJ/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 LM2674N-ADJ/NOPB reliable?
The price and inventory of LM2674N-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674N-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674N-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674N-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674N-ADJ/NOPB?
LM2674N-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674N-ADJ/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 LM2674N-ADJ/NOPB?
For technical support, including LM2674N-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674N-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2674N-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674N-ADJ/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 LM2674N-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674N-ADJ/NOPB?
All LM2674N-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674N-ADJ/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 LM2674N-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2674N-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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