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Texas Instruments LM2674LD-12/NOPB
- Part No.:
- LM2674LD-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2674LD-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
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Product details
Overview
LM2674LD-12/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering 500mA output current with ±1.5% output voltage tolerance, 260kHz fixed switching frequency, and 8V–40V input range. It integrates a 0.25Ω DMOS switch and operates in buck topology for industrial power conversion where compact size and high efficiency (>94% at 24VIN/12VOUT) are critical.
For engineers reviewing the LM2674LD-12/NOPB datasheet, LM2674LD-12/NOPB pinout, LM2674LD-12/NOPB application, or LM2674LD-12/NOPB equivalent, key selection considerations include fixed 12V output, SOIC-8 package thermal performance (RθJA = 105°C/W), TTL-compatible shutdown capability (50μA standby), and internal frequency compensation requiring only five external components.
Technical Context
The LM2674LD-12/NOPB implements a voltage-mode control architecture with an internal 260kHz oscillator and patented frequency compensation, eliminating need for external compensation networks. Its feedback loop regulates output by comparing FB pin voltage to a precise 1.21V internal reference - but for the fixed-12V variant, FB is internally tied to output, bypassing external resistor dividers.
It features cycle-by-cycle current limiting (0.62–1.2A typical limit), thermal shutdown, and a bootstrap-driven high-side DMOS switch with 0.25Ω RDS(ON). Shutdown is activated via ON/OFF pin below 1.4V threshold, reducing quiescent current to 50μA while maintaining full fault protection during standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1.5% over line/load/temperature - eliminates need for feedback resistors and ensures stable rail for analog/digital subsystems. |
| Max Output Current | 500mA DC - supports moderate-power loads such as microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 8V to 40V - enables direct operation from unregulated 12V/24V industrial or automotive supplies with margin for transients. |
| Switching Frequency | 260kHz fixed - allows use of small, low-cost inductors (e.g., 68µH) and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω typical at TJ = 25°C - minimizes conduction loss and enables >94% peak efficiency at 24VIN/12VOUT/500mA. |
| Standby Current | 50μA typical - supports low-power sleep modes in battery-backed or energy-conscious systems. |
| Protection Features | Thermal shutdown + current limit + under-voltage lockout - provides autonomous fault recovery without external supervision circuitry. |
Pinout & Package
LM2674LD-12/NOPB uses an 8-pin SOIC (D package) with 4.9mm × 6mm footprint and exposed pad not present - thermal dissipation relies on PCB copper area per RθJA = 105°C/W specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 10nF ceramic capacitor to VSW to drive high-side DMOS gate; critical for proper switch turn-on and efficiency. |
| NC (Pins 2,3) | No-connect | Internally unused; must remain unconnected and un-routed to avoid parasitic coupling or noise injection. |
| FB (Pin 4) | Feedback sense input | Internally shorted to output for fixed-12V version - no external divider required; floating or misconnection causes regulation failure. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible logic input; ≥1.4V enables regulator, <0.8V disables with 50μA standby draw - supports microcontroller-controlled power sequencing. |
| VSW (Pin 8) | Switch node output | Drives external inductor and Schottky catch diode; high dv/dt node requiring tight layout and minimal trace length to reduce EMI and ringing. |
| GND (Pin 6) | Power ground | Main return path for input/output capacitors and inductor; must connect to low-impedance system ground plane with shortest possible path. |
| VIN (Pin 7) | Input supply | Accepts 8–40V DC; requires local 22µF tantalum bypass capacitor placed adjacent to pin to suppress high-frequency switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS switch | 0.25Ω RDS(ON) enables self-contained buck conversion without external MOSFET, reducing BOM count and layout complexity. |
| Fixed 12V output | Eliminates feedback resistor network and associated tolerance/temperature drift errors - simplifies design validation and production calibration. |
| Internal frequency compensation | Removes need for external compensation components, ensuring stable operation across all recommended input/output conditions with minimal design iteration. |
| Thermal shutdown + current limit | Autonomous protection against overload, short-circuit, or inadequate heatsinking - prevents device destruction without external monitoring circuitry. |
| 260kHz fixed oscillator | Enables predictable EMI profile and consistent filter design; avoids variable-frequency jitter issues seen in hysteretic controllers. |
Applications
| Industrial Sensor Node Power | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Powers 12V analog front-end and digital logic in distributed field sensors operating from 24V DC rails with transient immunity requirements. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V bus to clean, regulated 12V for op-amps, ADCs, and MCU peripherals. Use Value: Delivers 500mA at >94% efficiency with no external compensation, reducing board space and qualification effort versus discrete solutions. | Use Scenario: Supplies isolated 12V rail to digital I/O driver stages in modular PLC backplanes with wide input voltage variation (18–36V). IC Role / Device Role / Timing Role: Non-isolated pre-regulator feeding downstream linear regulators or isolated DC-DC modules. Use Value: Fixed 12V output and 8–40V input range accommodate brownout and surge conditions without derating or additional front-end circuitry. |
| Test Equipment Auxiliary Supply | Legacy Industrial Control Panel |
Use Scenario: Generates stable 12V for FPGA configuration, memory, and interface ICs in portable benchtop test instruments powered from universal AC adapters. IC Role / Device Role / Timing Role: Compact, efficient secondary power rail generator with fast enable/disable for power-state management. Use Value: 50μA standby current and TTL shutdown allow deep-sleep modes, extending battery life in cordless variants. | Use Scenario: Replaces aging linear regulators in retrofit upgrades of 12V-powered HMI panels and relay drivers using legacy 24V distribution wiring. IC Role / Device Role / Timing Role: Drop-in buck replacement for obsolete 7812-based supplies, improving thermal performance and reliability. Use Value: SOIC-8 package fits existing footprints; 105°C/W thermal resistance enables operation without heatsinks in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675SD-12/NOPB | Same pinout and function but rated for 1A output current; higher RDS(ON) (0.35Ω) and slightly lower efficiency at light loads. | Supports higher-current loads (e.g., motor drivers or multiple peripherals) without redesigning layout or magnetics. | Select when future load growth or margin for peak currents is required; otherwise LM2674LD-12/NOPB offers better light-load efficiency and cost. |
| TPS5430DDAR | 3A synchronous buck with 2.5–36V input, 300kHz–2.5MHz programmable frequency, and integrated high/low-side FETs. | Enables smaller inductors and higher efficiency across wider load range, but requires external compensation and more complex layout. | Choose for next-generation designs needing scalability, higher current, or tighter EMI control - not a drop-in replacement due to different pinout and control architecture. |
Compared with LM2675SD-12/NOPB, LM2674LD-12/NOPB trades current headroom for lower quiescent current and simpler magnetics; versus TPS5430DDAR, it sacrifices integration and flexibility for proven ease-of-use and minimal external component count in fixed-12V applications.
Availability
LM2674LD-12/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, PLC I/O modules, test equipment auxiliary supplies, and legacy control panel retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2674LD-12/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 company specializing in analog, embedded processing, and power management technologies with broad industrial and automotive design expertise.
The LM2674 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for engineers seeking easy-to-use, highly reliable DC-DC buck regulators that minimize external components and accelerate time-to-market.
FAQ
What is the maximum input voltage rating for LM2674LD-12/NOPB?
The absolute maximum input voltage for LM2674LD-12/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe junction temperature or violating SOA limits, especially under high ambient or load conditions. Always maintain at least 1V margin below 45V in production designs, and verify thermal performance using the 105°C/W RθJA value with actual PCB copper area.
Does LM2674LD-12/NOPB require external feedback resistors?
No - LM2674LD-12/NOPB is the fixed 12V output variant, so its feedback node (FB pin) is internally connected to the output. External resistors are unnecessary and must not be added; doing so disrupts regulation and may cause overvoltage. This differs from the adjustable version (e.g., LM2674MX-ADJ/NOPB), which requires a resistor divider between VOUT and GND with FB at the midpoint.
How does the ON/OFF pin function on LM2674LD-12/NOPB?
The ON/OFF pin on LM2674LD-12/NOPB is a TTL-compatible enable input: applying ≥1.4V (typically pulled up to VIN or 5V) activates regulation, while ≤0.8V disables it, reducing quiescent current to 50μA typical. The pin has internal 7V pull-up, so leaving it floating defaults to enabled operation - ideal for simple always-on applications without control logic.
What package type is used by LM2674LD-12/NOPB?
LM2674LD-12/NOPB uses the 8-pin SOIC (D package) with dimensions 4.9mm × 6mm and standard gull-wing lead form. It does not include an exposed thermal pad - thermal performance depends entirely on PCB copper area connected to GND pins (6 and 7), with RθJA = 105°C/W specified for ~1 in² of copper.
Can LM2674LD-12/NOPB drive a 500mA load continuously at 40V input?
Yes, LM2674LD-12/NOPB is specified for 500mA continuous output across its full 8–40V input range, provided thermal design meets RθJA ≤105°C/W. At 40VIN/12VOUT, power dissipation rises due to higher duty cycle and switching losses; ensure ≥1 in² of 2-oz copper on inner/outer layers connected to GND pins, and verify junction temperature stays ≤125°C using θJA and ambient data.
LM2674LD-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 12V
- 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:
- 16-WSON (5x5)
LM2674LD-12/NOPB FAQ
1.How can I place an order for LM2674LD-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674LD-12/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-12/NOPB reliable?
The price and inventory of LM2674LD-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674LD-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674LD-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674LD-12/NOPB?
LM2674LD-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674LD-12/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-12/NOPB?
For technical support, including LM2674LD-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674LD-12/NOPB requirements.
6.How does Aetrix verify that LM2674LD-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674LD-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674LD-12/NOPB?
All LM2674LD-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674LD-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2674LD-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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