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Texas Instruments LM22674MRX-ADJ/NOPB
- Part No.:
- LM22674MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,483
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Product details
Overview
LM22674MRX-ADJ/NOPB from Texas Instruments is a 42 V input, 500 mA adjustable-output synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, voltage-mode PWM control with internal compensation, and delivers ±1.5% feedback reference accuracy down to 1.285 V output. Used in industrial power rails converting 12 V or 24 V to 3.3 V or 5 V with >90% efficiency.
For engineers reviewing the LM22674MRX-ADJ/NOPB datasheet, LM22674MRX-ADJ/NOPB pinout, LM22674MRX-ADJ/NOPB application, or LM22674MRX-ADJ/NOPB equivalent, key selection criteria include its 500 kHz fixed switching frequency, precision enable threshold (1.6 V typ), integrated bootstrap diode, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors without external compensation.
Technical Context
The LM22674MRX-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges (4.5 V–42 V). Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation with standard 3.3 µH–10 µH inductors and 10 µF–47 µF ceramic capacitors.
It features a dedicated BOOT pin driving the high-side MOSFET gate via an external 10 nF capacitor, minimum on-time of 100 ns, and minimum off-time of 200 ns to ensure boot-cap recharge. Thermal protection activates at 150°C with hysteresis, and precision enable supports sequencing with 0.6 V hysteresis and 6 µA internal pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - Supports direct connection to 24 V industrial buses and automotive battery rails with undervoltage lockout at 4.3 V (rising). |
| Output Current | 500 mA - Delivers full rated load without derating up to 125°C junction temperature with proper PCB copper area. |
| Feedback Reference | 1.285 V ±1.5% - Sets minimum adjustable output; enables precise 3.3 V, 5 V, or custom outputs using external resistor divider. |
| Switching Frequency | 500 kHz ±20% - Enables compact 3.3 µH inductors and 22 µF ceramic output capacitors while maintaining fast transient response. |
| RDS(ON) | 0.24 Ω max - Minimizes conduction loss at 500 mA, contributing to >90% peak efficiency at mid-load conditions. |
| Quiescent Current | 3.4 mA typ - Ensures low no-load power draw in always-on subsystems; drops to 25 µA in shutdown mode. |
| Enable Threshold | 1.6 V typ with 0.6 V hysteresis - Allows clean power sequencing using simple resistor dividers from upstream rails. |
Pinout & Package
LM22674MRX-ADJ/NOPB uses an HSOP-8 package with exposed thermal pad (4.89 mm × 3.90 mm), requiring solder connection of the EP pad to PCB ground plane for thermal performance (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOT) | Bootstrap supply node | Connects external 10 nF ceramic capacitor to SW; supplies gate drive voltage for internal high-side MOSFET. |
| 2,3 (NC) | No-connect terminals | Thermally conductive but electrically isolated; must remain unconnected per datasheet. |
| 4 (FB) | Feedback input | High-impedance (230 nA bias) node sensing output voltage via external resistor divider; sets regulated output. |
| 5 (EN) | Enable control input | Logic-level input with 6 µA internal pullup; <1.6 V disables regulator, >2.2 V enables; supports UVLO extension. |
| 6 (GND) | Power and signal ground | Common return path for IC core, power stage, and EP thermal pad; must be low-impedance connection to PCB ground plane. |
| 7 (VIN) | Main input supply | Accepts 4.5–42 V DC; requires local 10 µF ceramic input capacitor placed near pin for EMI and transient suppression. |
| 8 (SW) | Power switch output | Drives external Schottky diode and output inductor; swings from GND to VIN; requires short, wide PCB trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boot-strap diode | Eliminates need for external bootstrap diode, reducing BOM count and layout complexity in high-side gate drive path. |
| Internal soft-start (500 µs) | Prevents inrush current and output overshoot during power-up; eliminates need for external soft-start capacitor or circuitry. |
| Stable with ceramic capacitors | Supports low-ESR ceramic output caps (≥10 µF) without external compensation components-reduces footprint and cost. |
| WEBENCH® enabled | Direct integration with TI's WEBENCH Designer for automated component selection, efficiency simulation, thermal modeling, and PCB layout export. |
| Thermal shutdown + current limit | Protects against sustained overloads and PCB overheating: trips at 150°C junction temp and limits peak switch current to 0.7 A typ. |
Applications
| Industrial Control Power Supply | Telecom Line Card Biasing |
|---|---|
|
Use Scenario: Providing isolated 3.3 V or 5 V bias to PLC I/O modules, sensor interfaces, and fieldbus transceivers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated low-noise rail with fast load transient response. Use Value: Enables compact, thermally robust power stage meeting IEC 61000-4-2/4-4 immunity requirements due to low EMI from fixed 500 kHz frequency and integrated MOSFET. |
Use Scenario: Generating 5 V or adjustable 3.3 V for FPGA configuration, Ethernet PHYs, and microcontrollers on telecom line cards powered by -48 V or 24 V backplanes. IC Role / Device Role / Timing Role: Secondary point-of-load regulator stepping down intermediate bus voltage with tight output tolerance and sequencing capability. Use Value: Precision enable pin allows synchronized startup with upstream converters; ±1.5% reference ensures reliable logic-level compliance under wide temperature range (–40°C to 125°C). |
| Embedded System Core Rail | Automotive Body Control Module |
|
Use Scenario: Supplying 1.2 V–3.3 V core voltage to ARM Cortex-M microcontrollers, ADCs, and digital sensors in portable or space-constrained embedded systems. IC Role / Device Role / Timing Role: Efficient, self-contained buck converter replacing linear regulators to reduce heat and extend battery life. Use Value: 25 µA shutdown current extends battery runtime; internal compensation avoids tuning effort; 42 V absolute max rating accommodates load-dump transients. |
Use Scenario: Powering MCU, CAN transceivers, and LED drivers in body control units supplied from 12 V vehicle battery with cold-crank (4.5 V) and load-dump (42 V) extremes. IC Role / Device Role / Timing Role: Robust primary DC/DC regulator meeting AEC-Q100 Grade 1 requirements (–40°C to +125°C). Use Value: Qualified variant LM22674-Q1 exists; this part shares identical electrical specs and pinout-enables drop-in qualification path for automotive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-ADJ/NOPB | Same 42 V input, 500 mA rating, but 1.5 MHz switching frequency and different internal compensation. | Requires smaller inductors/caps but has higher switching losses; not pin-compatible due to different FB pin behavior and EN threshold. | Select when board space is critical and higher-frequency operation is acceptable; verify loop stability with new compensation. |
| TPS54302DDCR | 36 V input, 3 A output, 500 kHz, integrated FETs, but no internal soft-start or boot diode; requires external soft-start cap. | Higher current capability but larger solution size; lacks integrated bootstrap diode and precision enable hysteresis. | Choose for higher load demands (>500 mA); accept added external components and reduced integration for scalability. |
Compared with LM22674MRX-ADJ/NOPB, LM22670MRX-ADJ/NOPB trades higher frequency for reduced passive size but sacrifices ease of use in stability tuning, while TPS54302DDCR offers higher current headroom at the cost of increased design complexity and missing integrated features like soft-start and boot diode.
Availability
LM22674MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded system power rails requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified design migration paths.
Supply support for LM22674MRX-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 since 1930.
The LM22674MRX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for rapid, reliable DC/DC buck converter implementation with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the minimum output voltage supported by the LM22674MRX-ADJ/NOPB?
The LM22674MRX-ADJ/NOPB supports a minimum output voltage of 1.285 V, set by its internal feedback reference voltage. This value is specified with ±1.5% accuracy over –40°C to +125°C junction temperature and enables precise generation of common logic rails including 1.8 V, 2.5 V, 3.3 V, and 5 V using external resistor dividers. The device's internal compensation is optimized for outputs at or below 5 V.
Does the LM22674MRX-ADJ/NOPB require an external bootstrap diode?
No, the LM22674MRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and SW pins. Users must still place a 10 nF ceramic capacitor directly between BOOT and SW with short, low-inductance traces. This integration reduces BOM count, improves reliability, and simplifies layout compared to controllers requiring discrete bootstrap diodes.
Can the LM22674MRX-ADJ/NOPB operate from a 48 V input source?
No-the LM22674MRX-ADJ/NOPB has an absolute maximum input voltage rating of 43 V and recommended operating maximum of 42 V. Applying 48 V exceeds both limits and risks permanent damage. For 48 V input applications, consider TI's LM5164 or LM5165 families, which support up to 100 V input and share similar integration features like internal compensation and soft-start.
What thermal pad connection is required for the LM22674MRX-ADJ/NOPB?
The LM22674MRX-ADJ/NOPB HSOP-8 package includes an exposed thermal pad (EP) that must be soldered to a solid copper ground plane on the PCB. This connection is essential for thermal performance-TI specifies RθJA = 60°C/W only when the EP is properly connected. Failure to connect the EP results in excessive junction temperature rise and potential thermal shutdown under load.
Is the LM22674MRX-ADJ/NOPB pin-compatible with the LM22674-Q1 automotive variant?
Yes-the LM22674MRX-ADJ/NOPB and LM22674-Q1 share identical pinout, package (HSOP-8), electrical specifications, and functional behavior. The Q1 variant adds AEC-Q100 Grade 1 qualification (–40°C to +125°C), enhanced ESD robustness, and automotive-specific test reporting-but requires no PCB or schematic changes for drop-in replacement in qualified designs.
LM22674MRX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (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):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.285V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 500mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22674MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22674MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674MRX-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 LM22674MRX-ADJ/NOPB reliable?
The price and inventory of LM22674MRX-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 LM22674MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674MRX-ADJ/NOPB?
LM22674MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674MRX-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 LM22674MRX-ADJ/NOPB?
For technical support, including LM22674MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22674MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674MRX-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 LM22674MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674MRX-ADJ/NOPB?
All LM22674MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674MRX-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 LM22674MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22674MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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