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Texas Instruments LM22674MRX-5.0/NOPB
- Part No.:
- LM22674MRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674MRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,731
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Product details
Overview
LM22674MRX-5.0/NOPB from Texas Instruments is a 42 V input, 500 mA synchronous step-down DC/DC regulator with fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode. It operates across –40°C to +125°C junction temperature and delivers >90% efficiency in industrial power rails converting 12 V or 24 V inputs to stable 5 V logic supply.
For engineers reviewing the LM22674MRX-5.0/NOPB datasheet, LM22674MRX-5.0/NOPB pinout, LM22674MRX-5.0/NOPB application, or LM22674MRX-5.0/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, 200 mΩ N-channel MOSFET switch, precision enable threshold (1.6 V typ), soft-start timing (500 µs typ), and SO PowerPAD thermal package for high-power-density embedded designs.
Technical Context
The LM22674MRX-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain against VIN variation, enabling optimized transient response. Its internal Type III compensation network is tuned specifically for fixed 5 V output configurations, eliminating external compensation components.
It integrates a 42 V, 200 mΩ N-channel MOSFET switch and an on-chip bootstrap diode to drive the high-side gate. Minimum on-time (100 ns) and off-time (200 ns) constraints define practical input-output voltage ratios and ensure reliable boot-capacitor recharge under ≥5 mA minimum load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12 V, 24 V, and 36 V industrial/commercial rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback resistors; enables plug-and-play 5 V logic supply design. |
| Max Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Switching Frequency | 500 kHz - allows use of compact 3.3–10 µH inductors and low-ESR ceramic output capacitors. |
| RDS(ON) | 200 mΩ - reduces conduction loss at full load, supporting >90% peak efficiency at 12 VIN/5 VOUT. |
| Quiescent Current | 3.4 mA - ensures low no-load power draw in always-on subsystems such as monitoring circuits. |
| Enable Threshold | 1.6 V (typ), 0.6 V hysteresis - enables precise power sequencing with resistor dividers from upstream supplies. |
Pinout & Package
LM22674MRX-5.0/NOPB uses an 8-pin HSOP package (4.89 mm × 3.90 mm) with exposed thermal pad (EP) connected to GND for enhanced heat dissipation. The package is RoHS-compliant and lead-free (NOPB suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects external 10 nF ceramic capacitor to SW; supplies gate drive for internal high-side MOSFET. |
| EN | Enable control input | Logic-level input with 1.6 V threshold; pulls up internally at 6 µA; enables system power sequencing. |
| SW | Switch node | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize EMI. |
| FB | Feedback reference | Internally tied to 5 V output divider; not user-accessible in -5.0 version - simplifies layout and improves noise immunity. |
| GND | Power and signal ground | Primary return path; must be connected to EP for thermal performance and stability. |
| VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor placed near pin. |
| NC (Pins 1, 2, 3) | No-connect terminals | Thermally conductive but electrically isolated; may be used as heatsink anchors or left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external Schottky diode in boot path, reducing BOM count and PCB area while ensuring reliable gate drive. |
| Internal loop compensation | Optimized for fixed 5 V output - removes need for external compensation network and associated tuning effort. |
| 500 µs soft-start | Prevents inrush current and output overshoot during power-up; fixed timing avoids external capacitor dependency. |
| Thermal shutdown | Activates at 150°C junction temperature and releases at ~135°C - protects device during overload or poor heatsinking. |
| Stable with ceramic capacitors | Supports low-ESR X5R/X7R MLCCs on input and output - enables compact, high-reliability designs without tantalum or electrolytic caps. |
Applications
| Industrial PLC I/O Module | Telecom Line Card Power |
|---|---|
Use Scenario: Providing isolated 5 V rail for digital I/O conditioning, ADC reference, and microcontroller core supply in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5 V from 24 V backplane; handles load transients from relay actuation and sensor polling. Use Value: High input voltage range (up to 42 V) accommodates 24 V nominal with surge tolerance; SO PowerPAD enables convection-only cooling in sealed enclosures. | Use Scenario: Generating local 5 V supply for FPGA configuration, SerDes bias, and management MCU on telecom line cards powered from –48 V derived 12 V intermediate bus. IC Role / Device Role / Timing Role: Secondary-stage point-of-load regulator; interfaces directly with 12 V intermediate bus and provides clean, low-noise 5 V for sensitive analog/digital circuitry. Use Value: 500 kHz switching enables small 4.7 µH shielded inductor and 22 µF ceramic output cap; ±1.5% output accuracy ensures reliable FPGA startup and I²C communication. |
| Automotive Body Control Module | Embedded Medical Sensor Hub |
Use Scenario: Powering CAN transceivers, LIN interface ICs, and microcontrollers in non-safety-critical automotive body electronics operating from 12 V battery (with cold-crank down to 4.5 V). IC Role / Device Role / Timing Role: Main 5 V system rail regulator; coordinates with vehicle wake-up signals via EN pin for ultra-low standby current (25 µA). Use Value: Precision enable threshold (1.6 V) allows direct connection to microcontroller GPIO; –40°C to +125°C rating meets AEC-Q100 Grade 1 requirements for under-hood placement. | Use Scenario: Supplying 5 V to optical heart-rate sensors, SPI flash memory, and low-power ARM Cortex-M microcontrollers in portable diagnostic devices with long battery life requirements. IC Role / Device Role / Timing Role: Efficient primary DC/DC converter stepping down from single-cell Li-ion (4.2 V max) or dual-cell (8.4 V max) battery packs to stable 5 V. Use Value: 3.4 mA quiescent current minimizes standby drain; internal soft-start prevents sensor initialization faults during battery insertion or hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-5.0/NOPB | Same pinout, 150 kHz switching frequency, higher RDS(ON) (300 mΩ), lower max input (40 V). | Better suited for low-EMI, thermally relaxed designs where larger inductors/caps are acceptable. | Select when EMI filtering priority outweighs size/efficiency; verify thermal margin at 500 mA due to higher conduction loss. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, 2 MHz switching, different pinout (SOT-23-6), no integrated bootstrap diode. | Targets higher-current, space-constrained applications requiring smaller magnetics and faster transient response. | Choose only if ≥3 A output or <1 mm profile is required; redesign PCB layout and add external bootstrap diode. |
Compared with LM22670MRX-5.0/NOPB, the LM22674MRX-5.0/NOPB offers higher efficiency and smaller passive components due to its 500 kHz operation and lower RDS(ON); versus TPS54302DDCR, it provides simpler implementation and better high-input-voltage robustness but at lower current capacity and larger footprint.
Availability
LM22674MRX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded medical systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compatible performance.
Supply support for LM22674MRX-5.0/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 over 90 years of innovation in industrial, automotive, and communications markets.
The LM22674 series belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in cost-sensitive, high-reliability DC/DC conversion applications where minimal external components and fast time-to-market are critical.
FAQ
What is the maximum input voltage rating for LM22674MRX-5.0/NOPB?
The absolute maximum input voltage for LM22674MRX-5.0/NOPB is 43 V, but the recommended operating range is 4.5 V to 42 V. Operation above 42 V risks exceeding safe operating area limits and may trigger thermal shutdown or damage the internal 42 V MOSFET. For sustained reliability, keep VIN ≤42 V with appropriate derating for temperature and transients.
Does LM22674MRX-5.0/NOPB require external feedback resistors?
No. LM22674MRX-5.0/NOPB has an internal resistor divider configured for fixed 5.0 V output, so the FB pin is internally connected and must be tied directly to the output. Unlike the adjustable -ADJ variant, no external resistors are needed - reducing component count, layout complexity, and potential error sources in production.
Can LM22674MRX-5.0/NOPB operate with ceramic output capacitors only?
Yes. LM22674MRX-5.0/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic capacitors (e.g., X5R/X7R MLCCs). A typical design uses 22 µF ceramic output capacitance. No electrolytic or tantalum capacitors are required, enabling smaller footprint, longer lifetime, and improved reliability in wide-temperature environments.
What is the purpose of the exposed pad (EP) on LM22674MRX-5.0/NOPB?
The exposed pad (EP) on LM22674MRX-5.0/NOPB serves as the primary thermal path to the PCB. It must be soldered to a large copper pour connected to GND for effective heat dissipation. Proper EP connection reduces junction-to-board thermal resistance by ~40%, enabling full 500 mA output current capability at ambient temperatures up to +85°C without forced airflow.
How does the enable (EN) pin function on LM22674MRX-5.0/NOPB?
The EN pin on LM22674MRX-5.0/NOPB is a precision logic input with 1.6 V typical turn-on threshold and 0.6 V hysteresis. Pulling EN below 1.3 V disables the regulator, reducing quiescent current to 25 µA. It features an internal 6 µA pull-up, allowing direct connection to VIN via a resistor for simple power-on sequencing - no external bias required.
LM22674MRX-5.0/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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-5.0/NOPB FAQ
1.How can I place an order for LM22674MRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674MRX-5.0/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-5.0/NOPB reliable?
The price and inventory of LM22674MRX-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674MRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674MRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674MRX-5.0/NOPB?
LM22674MRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674MRX-5.0/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-5.0/NOPB?
For technical support, including LM22674MRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674MRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22674MRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674MRX-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674MRX-5.0/NOPB?
All LM22674MRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674MRX-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22674MRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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