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Texas Instruments LM2674MX-ADJ/NOPB
- Part No.:
- LM2674MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2674MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:16,702
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Product details
Overview
LM2674MX-ADJ/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering up to 500mA output current with ±1.5% output voltage tolerance, 260kHz fixed switching frequency, and 8V–40V input range. It regulates adjustable output voltages from 1.21V to 37V using external resistor feedback and integrates a 0.25Ω DMOS power switch for high-efficiency buck conversion in industrial power supplies.
For engineers reviewing the LM2674MX-ADJ/NOPB datasheet, LM2674MX-ADJ/NOPB pinout, LM2674MX-ADJ/NOPB application, or LM2674MX-ADJ/NOPB equivalent, key selection criteria include its 260kHz oscillator stability, thermal shutdown protection, TTL-compatible enable control, and compatibility with standard off-the-shelf inductors and Schottky diodes in SOIC-8 layout.
Technical Context
The LM2674MX-ADJ/NOPB implements a voltage-mode PWM control architecture with internal frequency compensation and a fixed 260kHz oscillator. Its feedback loop maintains regulation by comparing the FB pin voltage (targeted at 1.21V) against an internal reference, requiring only two external resistors to set output voltage across the 1.21V–37V range.
It operates in active mode when the ON/OFF pin exceeds 1.4V (typical), drawing 3.6mA quiescent current, and enters low-power shutdown at ≤1.4V with 50μA standby current. Protection includes cycle-by-cycle current limiting (0.62–1.2A), thermal shutdown, and overvoltage-safe bootstrap capacitor interface (CB pin).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500mA maximum continuous load - supports mid-power embedded systems without external current boosting. |
| Input Voltage Range | 8V to 40V - enables direct operation from unregulated 12V/24V industrial rails or automotive battery inputs. |
| Output Voltage Range | 1.21V to 37V adjustable - set via external resistor divider on FB pin; supports wide-range system rail generation. |
| Feedback Reference | 1.21V ±1.5% - defines precision of output regulation; determines R1/R2 ratio for target VOUT. |
| Switching Frequency | 260kHz fixed - allows use of compact, low-ESR inductors and reduces EMI compared to sub-100kHz converters. |
| RDS(ON) | 0.25Ω (typ) - minimizes conduction loss in high-side DMOS switch, enabling >90% efficiency at full load. |
| Enable Threshold | 1.4V (rising) - TTL-compatible ON/OFF pin allows direct interfacing with microcontroller GPIOs or logic-level signals. |
Pinout & Package
LM2674MX-ADJ/NOPB is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm footprint, with exposed pad not present. Pin functions are validated per TI SNVS007I Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 10nF ceramic capacitor between CB and VSW to drive high-side DMOS gate; critical for proper switch turn-on. |
| FB (Pin 4) | Feedback sense input | Monitors voltage divider midpoint; regulates output by holding this node at 1.21V; open-circuit or short-to-ground causes regulation failure. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible digital input; ≥1.4V enables switching, ≤0.8V disables regulator and reduces quiescent current to 50μA. |
| VSW (Pin 8) | Switch node output | Drains high-side DMOS switch; connects directly to inductor and Schottky diode cathode; carries high dv/dt switching waveform. |
| GND (Pin 6) | Power ground | Main return path for input/output capacitors and IC substrate; must be low-inductance connection to minimize noise and thermal rise. |
| VIN (Pin 7) | Input supply | Connects to 8–40V source and high-frequency bypass capacitor (CIN); trace to GND must be shortest possible to reduce ringing. |
| NC (Pins 2, 3) | No-connect | Internally unused; leave unconnected and un-routed; no electrical or thermal function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS switch | 0.25Ω RDS(ON) enables self-contained buck topology with only five external components required. |
| Fixed 260kHz oscillator | Eliminates need for external timing components and simplifies EMI filtering design versus variable-frequency alternatives. |
| ±1.5% output tolerance | Ensures stable system rail accuracy across line, load, and temperature without post-regulation trimming. |
| TTL shutdown capability | Supports precise power sequencing and low-power sleep modes via microcontroller GPIO without level-shifting. |
| Thermal + current protection | Prevents damage during overload, short-circuit, or poor heatsinking; resets automatically after fault removal. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
Use Scenario: Converting 24V factory bus to 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated intermediate rail with minimal BOM count. Use Value: Delivers 500mA at >90% efficiency with no heatsink required-reducing board area and thermal management complexity. | Use Scenario: Generating configurable 1.8V–12V supply for FPGA core, memory, or analog subsystems in field-deployable equipment. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter enabling single-BOM flexibility across multiple product variants. Use Value: 1.21V reference and resistor-based programming allow precise rail tuning without redesigning power stage. |
| Automotive Body Control Module | Test & Measurement Instrumentation |
Use Scenario: Regulating 12V vehicle battery to stable 5V for microcontroller and CAN transceiver in BCMs. IC Role / Device Role / Timing Role: Pre-regulator supplying clean, efficient power to linear regulators or LDOs feeding noise-sensitive circuits. Use Value: Wide 8–40V input range accommodates cold-crank (6.5V) and load-dump (40V) transients per ISO 7637-2. | Use Scenario: Providing isolated, low-noise 15V/–15V dual rails for op-amp signal chains in portable analyzers. IC Role / Device Role / Timing Role: Positive-to-negative inverting buck-boost stage (using LM2674 in inverting configuration). Use Value: Fixed 260kHz frequency enables predictable filter design and avoids audible noise in sensitive measurement environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574MX-ADJ/NOPB | Lower 52kHz switching frequency; higher RDS(ON) (0.45Ω); lower max input (40V same, but lower efficiency at high VIN) | Requires larger inductors/capacitors; less suitable for space-constrained designs needing high-frequency filtering | Choose when cost sensitivity outweighs size/efficiency needs and legacy design reuse is prioritized. |
| LMR36506RNXR | Synchronous 0.6A converter; 3–65V input; 200kHz–2.2MHz programmable frequency; integrated high/low FETs | Higher integration, smaller solution size, and wider input range-but requires more complex layout and external compensation | Choose for new designs demanding >95% efficiency, ultra-small footprint, or extended input voltage beyond 40V. |
Compared with LM2674MX-ADJ/NOPB, LM2574MX-ADJ/NOPB trades efficiency and size for cost and simplicity, while LMR36506RNXR replaces discrete power stage complexity with synchronous integration and programmable frequency-making it better suited for next-generation compact, high-efficiency systems.
Availability
LM2674MX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, automotive body control modules, and test & measurement instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LM2674MX-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, minimal external component count, and robust performance in cost-sensitive industrial and commercial DC-DC applications.
FAQ
What is the minimum input voltage required for stable operation of the LM2674MX-ADJ/NOPB?
The LM2674MX-ADJ/NOPB specifies a minimum recommended input voltage of 6.5V per its Recommended Operating Conditions table. Below this, regulation may fail due to insufficient headroom for the internal DMOS switch and control circuitry. For example, generating 5V output requires VIN ≥ 6.5V to maintain duty cycle margin and avoid dropout, especially under full 500mA load.
Can the LM2674MX-ADJ/NOPB be used in a negative-output (inverting) configuration?
Yes, the LM2674MX-ADJ/NOPB can be configured as a positive-to-negative inverting buck-boost regulator per TI Application Report SLVA053. In this topology, the IC's ground pin becomes the negative output rail, VSW connects to the inductor and diode anode, and the output capacitor references to system ground. Output polarity reverses, but all electrical limits-including 500mA current capability and 260kHz frequency-remain valid.
What is the purpose of the CB pin on the LM2674MX-ADJ/NOPB, and what capacitor value is required?
The CB pin on the LM2674MX-ADJ/NOPB serves as the bootstrap capacitor connection for the high-side DMOS gate driver. A 10nF (0.01µF), X7R or C0G ceramic capacitor rated for ≥50V must be placed between CB and VSW pins. This capacitor charges during the low-side conduction phase and provides the gate drive voltage needed to fully enhance the high-side switch during its on-time.
How does the feedback network determine output voltage for the LM2674MX-ADJ/NOPB?
The LM2674MX-ADJ/NOPB regulates output voltage by maintaining 1.21V on the FB pin. With R1 connected from VOUT to FB and R2 from FB to GND, VOUT = 1.21V × (1 + R1/R2). For instance, setting VOUT = 12V requires R1/R2 ≈ 8.92; selecting R2 = 10kΩ yields R1 = 89.2kΩ. TI recommends R2 between 10kΩ and 100kΩ for optimal bias current error and noise immunity.
Does the LM2674MX-ADJ/NOPB require external compensation components?
No, the LM2674MX-ADJ/NOPB features patented internal frequency compensation and is stable with standard external components (inductor, diode, input/output capacitors, and feedback resistors). No external compensation network is needed-unlike many current-mode controllers-reducing design time and component count while ensuring robust loop stability across operating conditions.
LM2674MX-ADJ/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:
- 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
LM2674MX-ADJ/NOPB FAQ
1.How can I place an order for LM2674MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674MX-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 LM2674MX-ADJ/NOPB reliable?
The price and inventory of LM2674MX-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 LM2674MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674MX-ADJ/NOPB?
LM2674MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674MX-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 LM2674MX-ADJ/NOPB?
For technical support, including LM2674MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2674MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674MX-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 LM2674MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674MX-ADJ/NOPB?
All LM2674MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674MX-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 LM2674MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2674MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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