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Texas Instruments LM22674QMRX-5.0/NOPB
- Part No.:
- LM22674QMRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674QMRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,123
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Product details
Overview
LM22674QMRX-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 200 mΩ N-channel MOSFET. It operates from –40°C to +125°C junction temperature and is AEC-Q100 Grade 1 qualified for automotive power rails.
For engineers reviewing the LM22674QMRX-5.0/NOPB datasheet, LM22674QMRX-5.0/NOPB pinout, LM22674QMRX-5.0/NOPB application, or LM22674QMRX-5.0/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance in HSOP PowerPAD package, precision enable threshold (1.6 V typ), soft-start timing (500 µs typ), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22674QMRX-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal Type III compensation is optimized for fixed 5 V output configurations, eliminating external compensation components.
It integrates a bootstrap diode and gate driver for high-side N-MOSFET operation, requires no external bootstrap diode, and enforces minimum on-time (100 ns) and off-time (200 ns) to ensure switch current sensing integrity and boot-capacitor recharge-critical for stable operation at high input-to-output voltage ratios.
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 and automotive battery rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider; enables plug-and-play integration for USB-powered peripherals and logic supplies. |
| Max Output Current | 500 mA - sufficient for powering microcontrollers, CAN transceivers, sensors, and small FPGAs in space-constrained systems. |
| Switching Frequency | 500 kHz ±20% - enables use of compact 2.2–4.7 µH inductors and low-ESR ceramic capacitors while maintaining good transient response. |
| Quiescent Current | 3.4 mA (typ) - ensures low standby power draw in always-on automotive modules such as body controllers and telematics units. |
| Standby Current | 25 µA (typ) - allows deep-sleep mode activation via precision enable pin without compromising system-level power budget. |
| Junction Temp Range | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and infotainment applications. |
Pinout & Package
LM22674QMRX-5.0/NOPB uses an 8-pin HSOP package with exposed thermal pad (4.89 mm × 3.90 mm), where the exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects external 10 nF ceramic capacitor to SW; provides gate drive voltage for internal high-side N-MOSFET. |
| EN | Enable control input | Logic-compatible input with 1.6 V typical turn-on threshold and 0.6 V hysteresis; supports precise power sequencing and external UVLO. |
| SW | Switch node | Drives external Schottky diode and output inductor; swings from GND to VIN during normal operation. |
| FB | Feedback reference | Internally connected to 5.0 V output divider; shorted to VOUT for fixed-output operation-no external resistors required. |
| GND | Power and signal ground | Primary return path for power stage and control circuitry; must be low-impedance connection to exposed pad. |
| VIN | Main input supply | Accepts 4.5–42 V DC; bypassed with ≥10 µF ceramic capacitor close to pin to suppress high-frequency noise and ripple. |
| NC | No-connect | Pins 2 and 3 are electrically isolated; used only for mechanical stability and thermal conduction-must not be routed. |
| EP | Exposed thermal pad | Must be soldered to solid GND copper area; provides primary thermal path-accounts for >70% of total heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 200 mΩ N-MOSFET | Enables full 500 mA output without external switch; reduces BOM count and layout complexity in space-constrained automotive modules. |
| Stable with ceramic capacitors | Eliminates need for electrolytic or tantalum output caps-improves reliability, lifetime, and temperature stability in harsh environments. |
| Internal soft-start (500 µs) | Prevents inrush current and output overshoot during power-up; avoids stress on downstream logic and interface ICs. |
| Thermal shutdown (150°C) | Protects against sustained overload or poor heatsinking; auto-recovery at ~135°C prevents latch-up and field failures. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C junction; includes HTOL, ESD, and board-level reliability testing per automotive standards. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interface circuitry in door module or lighting controller. IC Role / Device Role / Timing Role: Primary 5 V buck regulator converting 12 V battery rail to clean logic supply with fast load transient response. Use Value: Delivers stable 5 V at up to 500 mA with <1% line/load regulation-ensures reliable CAN communication and ADC accuracy across cold-crank (6.5 V) to load-dump (42 V) conditions. | Use Scenario: Supplies isolated 5 V logic rails for digital input/output cards in programmable logic controllers. IC Role / Device Role / Timing Role: Point-of-load regulator providing regulated 5 V from unregulated 24 V DC bus in DIN-rail mounted enclosures. Use Value: Operates continuously at 85°C ambient with derated output current; integrated thermal protection prevents field failure during cabinet overheating events. |
| Telecom Remote Radio Unit | Medical Diagnostic Sensor Interface |
Use Scenario: Generates 5 V supply for FPGA configuration, RF front-end bias, and serial interface in outdoor base station radios. IC Role / Device Role / Timing Role: High-voltage input buck converter supporting 36 V nominal telecom rectified bus with robust EMI filtering. Use Value: 500 kHz switching enables compact magnetics and low-profile layout; ±1.5% output accuracy maintains FPGA core voltage tolerance during wide temperature swings. | Use Scenario: Powers analog front-end, low-noise amplifiers, and ADC drivers in portable ultrasound or patient monitoring devices. IC Role / Device Role / Timing Role: Low-noise, fixed 5 V supply with minimal ripple (<10 mVpp) for precision signal chain components. Use Value: Internal compensation and ceramic-cap stability eliminate output oscillation risk; soft-start prevents sensor offset drift during power-on calibration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670QMRX-5.0/NOPB | Same pinout, 300 kHz switching frequency, higher RDS(ON) (300 mΩ), lower max input (40 V). | Suitable for cost-sensitive designs where size is less critical and lower switching loss is acceptable. | Select when lower EMI and reduced inductor core loss outweigh need for smallest possible magnetics. |
| TPS54302DDAR | 3.5–28 V input, 3 A output, 2.5 MHz switching, no integrated bootstrap diode, different pinout. | Targets higher-current, space-constrained applications requiring smaller inductors and faster transient response. | Choose only if redesigning PCB layout is acceptable and >500 mA output current is required. |
Compared with LM22674QMRX-5.0/NOPB, LM22670QMRX-5.0/NOPB trades switching speed for lower EMI and slightly relaxed thermal design, while TPS54302DDAR offers higher current and frequency at the cost of layout rework and external bootstrap diode requirement.
Availability
LM22674QMRX-5.0/NOPB is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM22674QMRX-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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM22674 product line delivers SIMPLE SWITCHER® buck regulators targeting high-input-voltage, medium-current applications where ease of design, thermal robustness, and automotive qualification are critical.
FAQ
What is the maximum input voltage rating for LM22674QMRX-5.0/NOPB?
The absolute maximum input voltage for LM22674QMRX-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 SOA limits and may trigger overvoltage protection or damage the internal MOSFET. The device is designed for automotive battery rails including cold-crank (6.5 V) and load-dump (42 V) transients, and must be used with appropriate input filtering per TI's layout guidelines.
Does LM22674QMRX-5.0/NOPB require external feedback resistors?
No, LM22674QMRX-5.0/NOPB does not require external feedback resistors because it features a factory-trimmed internal resistor divider that sets the output to precisely 5.0 V. The FB pin is internally connected to this divider and must be tied directly to the output capacitor's VOUT node. Adding external resistors will disrupt regulation and cause output voltage error-only the adjustable version (LM22674-ADJ) uses external feedback.
Can LM22674QMRX-5.0/NOPB operate without a bootstrap capacitor?
No, LM22674QMRX-5.0/NOPB requires a 10 nF ceramic capacitor between BOOT and SW pins. This capacitor supplies gate drive voltage for the internal high-side N-MOSFET and must be placed with short, low-inductance traces. Omitting it causes immediate switch failure and loss of regulation. The device integrates a bootstrap diode, so no external diode is needed-but the capacitor is mandatory for all operating conditions.
Is LM22674QMRX-5.0/NOPB compatible with ceramic output capacitors only?
Yes, LM22674QMRX-5.0/NOPB is specifically designed and tested for stability with low-ESR ceramic output capacitors (e.g., X5R/X7R 10–47 µF). It is not stable with high-ESR electrolytic or tantalum capacitors due to its internal Type III compensation architecture. Using non-ceramic caps can cause oscillation, poor transient response, or thermal runaway-TI's datasheet explicitly states "stable with low ESR ceramic capacitors" as a key feature.
What is the thermal resistance (RθJA) of LM22674QMRX-5.0/NOPB in its HSOP package?
The junction-to-ambient thermal resistance (RθJA) for LM22674QMRX-5.0/NOPB in the HSOP-8 PowerPAD package is 60°C/W, measured under standard JEDEC JESD51-7 conditions (single-layer 1-in² copper pad). Actual thermal performance depends heavily on PCB layout: full soldering of the exposed pad to a ≥2-in² internal or external GND plane reduces RθJA to ≤35°C/W, enabling full 500 mA output at 85°C ambient.
LM22674QMRX-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:
- Obsolete
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22674QMRX-5.0/NOPB FAQ
1.How can I place an order for LM22674QMRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674QMRX-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 LM22674QMRX-5.0/NOPB reliable?
The price and inventory of LM22674QMRX-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 LM22674QMRX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674QMRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674QMRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674QMRX-5.0/NOPB?
LM22674QMRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674QMRX-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 LM22674QMRX-5.0/NOPB?
For technical support, including LM22674QMRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674QMRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22674QMRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674QMRX-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 LM22674QMRX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674QMRX-5.0/NOPB?
All LM22674QMRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674QMRX-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 LM22674QMRX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22674QMRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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