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Texas Instruments LM2674M-ADJ/NOPB
- Part No.:
- LM2674M-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674M-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,957
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Product details
Overview
LM2674M-ADJ/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter IC designed for fixed-frequency buck regulation in industrial and embedded power supplies. It delivers up to 500mA output current, operates from 8V to 40V input, regulates adjustable output voltage from 1.21V to 37V with ±1.5% tolerance, and integrates a 0.25Ω DMOS switch with 260kHz internal oscillator - used in point-of-load conversion for microcontroller-based systems.
For engineers reviewing the LM2674M-ADJ/NOPB datasheet, LM2674M-ADJ/NOPB pinout, LM2674M-ADJ/NOPB application, or LM2674M-ADJ/NOPB equivalent, key selection criteria include its wide input range (8–40V), adjustable feedback reference (1.21V), thermal shutdown protection, TTL-compatible enable control, and SOIC-8 package compatibility with standard PCB layout practices.
Technical Context
The LM2674M-ADJ/NOPB implements a voltage-mode PWM control architecture with internal frequency compensation and a fixed 260kHz oscillator. Its feedback loop compares the FB pin voltage against an internal 1.21V reference to regulate output via external resistor divider, enabling precise output programming across 1.21V–37V.
It features cycle-by-cycle current limiting (0.62–1.2A typical), thermal shutdown, and TTL-level ON/OFF control with 50μA standby current. The integrated high-side DMOS switch has 0.25Ω RDS(ON) at 25°C and drives external catch diodes and inductors - requiring only five external components for full operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 40 V - supports wide-range industrial DC inputs including 12V, 24V, and 36V rails without pre-regulation. |
| Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Feedback Reference | 1.21 V ±1.5% - enables accurate adjustable output via two-resistor divider; sets minimum output at 1.21V and scales linearly. |
| Switching Frequency | 260 kHz - allows use of small, low-cost inductors (e.g., 47 µH) and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25 Ω (typ.) - minimizes conduction loss at 500mA, contributing to >90% efficiency at 12VIN/5VOUT. |
| Quiescent Current | 3.6 mA (active), 50 µA (standby) - enables low-power operation during system sleep modes without external bias circuitry. |
| Protection Features | Thermal shutdown + current limit - prevents damage under overload, short-circuit, or elevated ambient conditions without external sensing. |
Pinout & Package
LM2674M-ADJ/NOPB is packaged in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed pad grounded for thermal performance. Pin 1 is CB (bootstrap capacitor), Pin 4 is FB (feedback input), Pin 5 is ON/OFF (TTL-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 | Connects 10-nF ceramic capacitor to VSW to drive high-side DMOS gate; critical for proper switch turn-on. |
| FB (Pin 4) | Feedback sense input | Monitors output voltage via resistor divider; regulates output by holding this pin at 1.21V; open-circuit disables regulation. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible logic input: ≥1.4V enables regulator; ≤0.8V disables with 50µA standby current; floating = enabled. |
| GND (Pin 6) | Power ground | Main return path for input/output capacitors and switch current; must be low-impedance and short-traced to CIN/COUT. |
| VIN (Pin 7) | Input supply | Connects to 8–40V source and high-frequency bypass capacitor; trace must minimize inductance to reduce switching noise. |
| VSW (Pin 8) | Switch node output | Drives external inductor and catch diode cathode; high dv/dt node requiring tight layout and minimal parasitic capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 1.21 V to 37 V - supports diverse system rail requirements using only two external resistors; no need for multiple fixed-voltage variants. |
| Integrated DMOS switch | 0.25 Ω RDS(ON) - eliminates external MOSFET, simplifies BOM, and improves efficiency over discrete switch designs. |
| Fixed 260 kHz frequency | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter and simplifies compliance testing. |
| Thermal + current protection | Auto-recovering shutdown at 150°C junction temp and 0.62–1.2A current limit - ensures robustness in unattended or sealed environments. |
| Low-component count design | Only five external parts required (inductor, diode, input/output caps, bootstrap cap) - accelerates prototyping and reduces layout risk. |
Applications
| Industrial Sensor Node Power | Microcontroller Core Supply |
|---|---|
|
Use Scenario: Powering a battery-backed environmental sensor node with RS-485 interface and analog front-end, operating from a 24V field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V to 3.3V for MCU, ADC, and transceiver - configured via FB divider for exact rail accuracy. Use Value: Delivers stable 3.3V at 300mA with <1.5% output error across temperature and line variation, eliminating need for post-regulation LDO. |
Use Scenario: Generating 1.8V core voltage for an ARM Cortex-M4 microcontroller in a programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Adjustable buck converter stepping down 12V intermediate rail to 1.8V using precision feedback resistors and low-ESR ceramic output capacitor. Use Value: Achieves >88% efficiency at 500mA load while maintaining <10mV ripple, reducing heat buildup in dense PLC backplane layouts. |
| Efficient Preregulator for Linear Regulators | Positive-to-Negative Converter Stage |
|
Use Scenario: Reducing 24V supply to 5.5V before feeding a low-noise LDO that powers analog signal chain in medical instrumentation. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing power dissipation in downstream LDO; operated in continuous conduction mode for low output ripple. Use Value: Lowers LDO dropout voltage requirement and thermal load by 75%, extending reliability in fanless medical enclosures. |
Use Scenario: Generating –5V rail from +12V for op-amp biasing in industrial data acquisition systems with bipolar signal conditioning. IC Role / Device Role / Timing Role: Buck converter reconfigured as inverting topology (VSW to inductor, GND to output capacitor negative terminal) to produce regulated negative output. Use Value: Enables clean –5V at 200mA without dedicated inverting IC, leveraging same layout and component set as positive buck designs. |
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-ADJ/NOPB | Same pinout, 100mA higher current rating (600mA), improved efficiency at light loads due to optimized gate drive. | Better suited for margin-critical 500mA designs or future-proofing against load growth; identical layout compatibility. | Select when long-term load headroom or <1% efficiency gain at 100mA matters more than cost sensitivity. |
| TPS54202DR | Synchronous buck, 4.5–28V input, 2A output, 500kHz–2.2MHz adjustable frequency, integrated high/low FETs. | Higher integration, smaller solution size, but requires different compensation and lacks direct SOIC-8 drop-in capability. | Choose for space-constrained designs needing >500mA or higher efficiency above 12VIN, accepting redesign effort. |
Compared with LM2674M-ADJ/NOPB, LM2675M-ADJ/NOPB offers extended current headroom in identical packaging, while TPS54202DR provides synchronous efficiency and frequency flexibility at the cost of layout and compensation changes - making LM2674M-ADJ/NOPB optimal for proven, low-risk 500mA SOIC-8 implementations.
Availability
LM2674M-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded sensor systems, and programmable logic controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2674M-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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - engineered for ease of use in cost-sensitive, medium-power DC-DC conversion applications where reliability, minimal external components, and fast time-to-market are critical.
FAQ
What is the maximum output voltage achievable with LM2674M-ADJ/NOPB?
The LM2674M-ADJ/NOPB supports an adjustable output voltage range from 1.21 V to 37 V, determined by the external resistor divider on the FB pin. This upper limit is constrained by the absolute maximum switch node voltage rating (45 V) and internal reference stability - not by the IC itself. For outputs above 30 V, ensure input voltage headroom and external component voltage ratings comply with datasheet limits.
Does LM2674M-ADJ/NOPB require an external catch diode?
Yes, LM2674M-ADJ/NOPB is a non-synchronous buck converter and requires an external Schottky diode connected between VSW and output ground. A 3.3-A, 50-V Schottky rectifier (e.g., IR 30WQ05F) is recommended per TI's typical application circuit. Omitting this diode will prevent proper energy transfer and cause failure.
Can LM2674M-ADJ/NOPB operate with input voltage below 8 V?
No - the LM2674M-ADJ/NOPB has a specified minimum input voltage of 8 V per Recommended Operating Conditions. Operation below 6.5 V is outside specification and may result in unstable regulation, dropout, or failure to start. For sub-8V inputs, consider TI's LM2678 or newer alternatives like TPS54202.
How is the feedback resistor divider calculated for LM2674M-ADJ/NOPB?
For LM2674M-ADJ/NOPB, use R1 = R2 × ((VOUT/1.21) − 1), where R2 is typically 10 kΩ to 100 kΩ. Example: for 5 V output, R1 = 10 kΩ × ((5/1.21) − 1) ≈ 31.5 kΩ. TI recommends 1% tolerance metal-film resistors and routing the FB trace away from noisy nodes to avoid regulation errors.
Is LM2674M-ADJ/NOPB RoHS compliant and lead-free?
Yes, LM2674M-ADJ/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix in the part number. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for lead-free reflow soldering per IPC/JEDEC J-STD-020 standards.
LM2674M-ADJ/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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2674M-ADJ/NOPB FAQ
1.How can I place an order for LM2674M-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674M-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 LM2674M-ADJ/NOPB reliable?
The price and inventory of LM2674M-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 LM2674M-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674M-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674M-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674M-ADJ/NOPB?
LM2674M-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674M-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 LM2674M-ADJ/NOPB?
For technical support, including LM2674M-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674M-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2674M-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674M-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 LM2674M-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674M-ADJ/NOPB?
All LM2674M-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674M-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 LM2674M-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2674M-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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