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Texas Instruments LM2674LD-ADJ/NOPB
- Part No.:
- LM2674LD-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2674LD-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,636
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Product details
Overview
LM2674LD-ADJ/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter IC delivering up to 500mA output current, operating from 8V to 40V input, with adjustable output voltage (1.21V–37V), ±1.5% output voltage tolerance, and 260kHz fixed switching frequency. It serves as a primary buck regulator in industrial power supplies requiring high efficiency (>90%) and minimal external components.
For engineers reviewing the LM2674LD-ADJ/NOPB datasheet, LM2674LD-ADJ/NOPB pinout, LM2674LD-ADJ/NOPB application, or LM2674LD-ADJ/NOPB equivalent, key selection criteria include feedback reference accuracy (1.21V), internal 0.25Ω DMOS switch RDS(ON), TTL-compatible ON/OFF control, thermal shutdown protection, and SOIC-8 package compatibility with standard PCB layout practices.
Technical Context
The LM2674LD-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 external resistor divider.
It operates in continuous conduction mode with cycle-by-cycle current limiting and thermal shutdown. The 260kHz oscillator allows compact LC filter design, while the bootstrap capacitor (CB) enables efficient high-side gate drive without external charge pump circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 40 V - supports wide industrial input rails including 12 V, 24 V, and 36 V systems without pre-regulation. |
| Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems. |
| Feedback Reference Voltage | 1.21 V ±1.5% - sets output accuracy and stability across temperature and load; determines R1/R2 divider ratio for target VOUT. |
| Switching Frequency | 260 kHz - enables 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 500 mA, contributing to >90% peak efficiency in typical 12 V → 5 V designs. |
| Shutdown Current | 50 µA (typ.) - enables low-power standby operation in battery-backed or energy-sensitive applications. |
| Oscillator Tolerance | ±10% - ensures predictable timing for filter design and EMI management without requiring external clock sync. |
Pinout & Package
LM2674LD-ADJ/NOPB is housed in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed pad not present (unlike WSON). Pin functions are validated per TI SNVS007I Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 10-nF ceramic capacitor to VSW; enables high-side FET gate drive above VIN - critical for proper switch operation. |
| FB (Pin 4) | Feedback sense input | High-impedance (85 nA bias) node monitoring output divider midpoint; deviation from 1.21 V triggers PWM correction. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible logic input; ≥1.4 V enables regulation, ≤0.8 V disables with 50 µA standby current - supports system-level power sequencing. |
| VSW (Pin 8) | Switch node output | Drains internal DMOS FET; connects directly to inductor and Schottky diode cathode - high dv/dt node requiring careful PCB routing. |
| GND (Pin 6) | Power ground | Main return path for input capacitor (CIN) and output capacitor (COUT); must be short, low-inductance trace to minimize noise and thermal rise. |
| VIN (Pin 7) | Input supply | Connects to bulk input source and high-frequency bypass capacitor; path to CIN and GND must be minimized to reduce switching loop inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25Ω DMOS switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity in space-constrained designs. |
| Patented internal frequency compensation | Enables stable operation with only five external components - no loop compensation calculations or external RC networks required. |
| Adjustable output (1.21V–37V) | Supports single-IC reuse across multiple voltage rails via resistor divider; avoids stocking multiple fixed-output variants. |
| TTL-compatible enable with 50µA standby | Allows direct interfacing with MCU GPIOs and low-power sleep modes without level-shifting or additional bias circuitry. |
| Thermal shutdown + current limit protection | Provides autonomous fault recovery under overload or ambient overheating - prevents damage during transient overloads or poor heatsinking. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powers isolated sensor interfaces and digital I/O drivers in DIN-rail mounted programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator generating 3.3 V or 5 V rail for microcontroller, ADC, and optocoupler circuitry. Use Value: Delivers 500 mA at >90% efficiency with minimal thermal rise on standard FR-4, eliminating need for heatsinks or forced air cooling. | Use Scenario: Supplies regulated 5 V to CAN transceivers, LIN interface ICs, and door lock actuators in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Pre-regulator stepping down noisy vehicle battery voltage (9–16 V) before LDOs or analog front-ends. Use Value: Wide 8–40 V input range accommodates cold-crank (6.5 V min) and load-dump (40 V max) conditions per ISO 7637-2. |
| Point-of-Load Converter for FPGA Core | Medical Patient Monitor Auxiliary Rail |
Use Scenario: Generates configurable 1.8 V core voltage for low-power FPGA or ASIC in portable diagnostic equipment. IC Role / Device Role / Timing Role: Adjustable buck converter using FB pin and precision resistor divider to set exact core voltage. Use Value: 1.21 V reference tolerance (±1.5%) ensures stable core rail within FPGA's tight VCCINT spec, even under varying load and temperature. | Use Scenario: Provides clean, low-noise 3.3 V supply for analog signal conditioning and ECG front-end amplifiers. IC Role / Device Role / Timing Role: Primary DC-DC stage feeding low-noise LDOs; operates at fixed 260 kHz to avoid sensitive audio/ECG bands. Use Value: High PSRR at switching frequency and low output ripple (<15 mVpp typical) preserve signal integrity in millivolt-level biopotential measurements. |
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 40 V max input, but 52 kHz switching frequency - requires larger magnetics and yields lower efficiency (~75%). | Better suited for cost-sensitive, low-EMI applications where size and efficiency are secondary. | Select when legacy design reuse or ultra-low EMI is prioritized over board area and thermal performance. |
| LMR14020SDDAR | Synchronous 2 A buck with integrated high/low-side FETs, 40 V input, 2.1 MHz switching - higher integration and efficiency, but requires more complex layout. | Targets higher-current, space-constrained applications needing >500 mA or tighter output regulation. | Choose for next-generation designs requiring scalability beyond 500 mA or improved light-load efficiency. |
Compared with LM2674LD-ADJ/NOPB, LM2574H-ADJ trades efficiency and size for simplicity and EMI margin, while LMR14020SDDAR upgrades current capability and integration at the cost of design complexity - LM2674LD-ADJ/NOPB remains optimal for proven, 500 mA industrial buck designs requiring minimal external parts and SOIC compatibility.
Availability
LM2674LD-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and medical instrumentation requiring stable component supply, long-term manufacturability, and TI's extended product lifecycle support.
Supply support for LM2674LD-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, with decades of expertise in high-reliability power conversion ICs.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and robust protection features are essential.
FAQ
What is the minimum input voltage required for stable operation of the LM2674LD-ADJ/NOPB?
The LM2674LD-ADJ/NOPB specifies a minimum recommended input voltage of 6.5 V per its Recommended Operating Conditions table. Below this, regulation may fail due to insufficient headroom for the internal switch and control circuitry. For reliable startup and full 500 mA output capability, 8 V is the practical minimum - consistent with the 1.21 V feedback reference and typical duty cycle constraints.
Can the LM2674LD-ADJ/NOPB be used to generate a 1.8 V output?
Yes, the LM2674LD-ADJ/NOPB can generate 1.8 V using the FB pin and an external resistor divider. With a 1.21 V internal reference, R1 and R2 must satisfy VOUT = 1.21 × (1 + R1/R2). For 1.8 V, R1/R2 ≈ 0.488 - e.g., R2 = 100 kΩ, R1 = 48.8 kΩ. Layout care is critical: route FB trace away from VSW and use Kelvin connection to minimize noise-induced regulation error.
Does the LM2674LD-ADJ/NOPB require an external bootstrap diode?
No, the LM2674LD-ADJ/NOPB does not require an external bootstrap diode. Its internal bootstrap circuit uses only a 10-nF ceramic capacitor between CB and VSW pins. This self-contained charge-pump architecture eliminates discrete diodes and simplifies layout - confirmed in TI's Figure 4-1 pinout and Section 6.3.1 of SNVS007I.
What is the maximum achievable output voltage using the LM2674LD-ADJ/NOPB?
The LM2674LD-ADJ/NOPB supports an adjustable output voltage range of 1.21 V to 37 V, as specified in Section 1 Features and Electrical Characteristics Table 5.8. This upper limit is constrained by absolute maximum ratings (45 V supply) and internal switch breakdown margin. At 37 V output, ensure VIN remains ≤40 V and verify thermal performance under full load using RθJA = 105°C/W for SOIC package.
How does the ON/OFF pin function during power-up sequencing?
The ON/OFF pin of the LM2674LD-ADJ/NOPB has an internal 7 V pull-up, allowing it to be left floating for default "always-on" operation. During controlled sequencing, driving it below 0.8 V (min) disables the regulator with 150 µA max standby current over temperature. Rise time must exceed 100 ns to avoid metastability; TI recommends direct MCU GPIO connection without RC filtering for deterministic enable behavior.
LM2674LD-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 16-WSON (5x5)
LM2674LD-ADJ/NOPB FAQ
1.How can I place an order for LM2674LD-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674LD-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 LM2674LD-ADJ/NOPB reliable?
The price and inventory of LM2674LD-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 LM2674LD-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674LD-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674LD-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674LD-ADJ/NOPB?
LM2674LD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674LD-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 LM2674LD-ADJ/NOPB?
For technical support, including LM2674LD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674LD-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2674LD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674LD-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 LM2674LD-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674LD-ADJ/NOPB?
All LM2674LD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674LD-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 LM2674LD-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2674LD-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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