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Texas Instruments LM22673QMRX-5.0/NOPB
- Part No.:
- LM22673QMRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673QMRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
LM22673QMRX-5.0/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode. It delivers >90% efficiency across 4.5–42 V input for industrial power rails.
For engineers reviewing the LM22673QMRX-5.0/NOPB datasheet, LM22673QMRX-5.0/NOPB pinout, LM22673QMRX-5.0/NOPB application, or LM22673QMRX-5.0/NOPB equivalent, key selection criteria include its automotive-grade AEC-Q100 Grade 1 qualification (–40°C to +125°C), adjustable current limit via IADJ pin, soft-start timing control, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22673QMRX-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain against VIN variation, enabling optimized transient response. Its internal Type III compensation is tuned for fixed 5 V output operation, eliminating external compensation components.
It integrates a 120 mΩ N-channel MOSFET switch and uses a bootstrap capacitor between BOOT and SW to drive the high-side gate. Minimum on-time (100 ns) and off-time (200 ns) constraints define practical input-output voltage conversion limits, while current foldback protects during severe overloads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from 12 V, 24 V, and 42 V industrial/automotive rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider; enables plug-and-play 5 V rail generation. |
| Max Output Current | 3 A - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 500 kHz - allows compact magnetics and ceramic capacitors; balances EMI and efficiency. |
| RDS(ON) | 120 mΩ (PFM package) - reduces conduction loss at full load; contributes to >90% peak efficiency. |
| Operating Junction Temp | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive use. |
| Soft-Start Time | Adjustable via SS pin capacitor - prevents inrush current; default ~500 µs with no external cap. |
Pinout & Package
LM22673QMRX-5.0/NOPB uses the HSOP-8 PowerPAD (DDA) package with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input (4.5–42 V); connects to bulk capacitance and EMI filter. |
| SW | Switch Node | Drives external inductor; swings from GND to VIN; requires tight layout to minimize ringing. |
| BOOT | Bootstrap Supply | Connects to SW via 10 nF ceramic capacitor; supplies gate drive for internal high-side MOSFET. |
| FB | Feedback Input | Internally tied to 5 V reference; shorted directly to VOUT for fixed-output operation. |
| GND | Ground Reference | Analog and power ground; must be connected to exposed pad for thermal and noise performance. |
| SS | Soft-Start Control | Sinks 50 µA current; external capacitor sets ramp time; resets on shutdown or thermal fault. |
| IADJ | Current Limit Adjust | Resistor-to-GND sets peak switch current (default 4.2 A); floating = factory setting. |
| EP | Exposed Pad | Thermal and electrical connection to PCB ground plane; mandatory for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Diode | Eliminates external bootstrap diode; reduces BOM count and layout area in buck topology. |
| Adjustable Current Limit | Single resistor from IADJ to GND scales peak switch current from ~2.5 A to 4.2 A, enabling design margin tuning. |
| Stable with Ceramic Capacitors | Internal compensation ensures stability with low-ESR ceramic output caps-no tantalum or electrolytic required. |
| AEC-Q100 Qualified | Grade 1 qualification (–40°C to +125°C) confirms suitability for automotive power modules and ADAS ECUs. |
| UVLO with Hysteresis | Turn-on at 4.3 V, turn-off at 3.9 V - prevents erratic startup during brownout conditions on vehicle battery rails. |
Applications
| Industrial PLC Power | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 24 V vehicle battery to clean 5 V for microcontroller, CAN transceiver, and sensor interfaces in body control units. IC Role / Device Role / Timing Role: Primary 5 V point-of-load regulator; provides stable supply independent of battery fluctuations. Use Value: AEC-Q100 Grade 1 rating and 42 V input withstand ensure reliable operation during load dump (up to 40 V pulses). | Use Scenario: Generating 5 V from 12 V rail to power logic circuits and communication peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering regulated 5 V at up to 3 A with minimal external components. Use Value: Integrated bootstrap diode and internal compensation reduce bill-of-materials and layout complexity versus discrete controller solutions. |
| Telecom Remote Radio Unit | Medical Diagnostic Equipment |
Use Scenario: Converting 48 V intermediate bus to 5 V for FPGA configuration, ADC reference, and interface ICs in remote radio heads. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator supporting wide VIN range and fast transient response. Use Value: 500 kHz switching frequency enables small inductors and low-profile ceramic capacitors, critical for space-constrained RF enclosures. | Use Scenario: Providing isolated 5 V auxiliary supply for patient monitoring sensors and display controllers requiring low-noise, stable voltage. IC Role / Device Role / Timing Role: Main 5 V power stage with soft-start and thermal protection for safety-critical subsystems. Use Value: Adjustable soft-start via SS pin prevents inrush-induced voltage droop on shared system rails during power-up 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 |
|---|---|---|---|
| LM22674QMRX-5.0/NOPB | Same pinout, 500 kHz, but rated for 5 A output and 100 mΩ RDS(ON) in SO PowerPAD package. | Higher current capability suits designs scaling beyond 3 A; requires larger thermal pad footprint. | Select when future-proofing for higher load or lower conduction loss is needed; not drop-in due to package thermal profile difference. |
| TPS54340QDDARQ1 | 42 V, 3.5 A, 500 kHz, but uses current-mode control and requires external compensation; no integrated bootstrap diode. | Better light-load efficiency via Eco-mode; more flexible loop tuning but increases design complexity. | Choose when dynamic load regulation or ultra-low quiescent current (<100 µA) is prioritized over simplicity. |
Compared with LM22674QMRX-5.0/NOPB and TPS54340QDDARQ1, the LM22673QMRX-5.0/NOPB offers the simplest implementation for fixed 5 V, 3 A applications-requiring only input/output capacitors, inductor, and optional soft-start cap-while meeting automotive temperature and qualification requirements out of the box.
Availability
LM22673QMRX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom power conversion requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM22673QMRX-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 designing analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The LM22673 product line delivers SIMPLE SWITCHER® buck regulators optimized for high-input-voltage applications with minimal external components and automotive-grade reliability.
FAQ
What is the maximum input voltage rating for LM22673QMRX-5.0/NOPB?
The absolute maximum input voltage for LM22673QMRX-5.0/NOPB is 43 V, with recommended operating range from 4.5 V to 42 V. This allows direct regulation from 24 V and 42 V industrial or automotive supply rails, including transient conditions like ISO 7637-2 pulse 5a (load dump). Operation above 42 V risks exceeding safe operating area limits and triggering thermal shutdown.
Does LM22673QMRX-5.0/NOPB require an external feedback resistor divider?
No, LM22673QMRX-5.0/NOPB does not require an external feedback resistor divider because it features a factory-trimmed internal 5.0 V reference. The FB pin is connected directly to the output for fixed 5 V operation. External dividers are only needed for adjustable versions (e.g., LM22673-ADJ) or when generating voltages above 5 V using the -5.0 variant.
How is current limit adjusted on LM22673QMRX-5.0/NOPB?
Current limit on LM22673QMRX-5.0/NOPB is adjusted by connecting a resistor between the IADJ pin and GND. With IADJ floating, the device defaults to ~4.2 A peak switch current. Adding a resistor sets the limit per Figure 12 in the datasheet; for example, a 10 kΩ resistor yields ~2.8 A. Accuracy degrades to ±35%/–25% when adjusted, versus ±15% at default.
What thermal management is required for LM22673QMRX-5.0/NOPB at full 3 A load?
At 3 A continuous load with 12 V input and 5 V output, LM22673QMRX-5.0/NOPB dissipates ~1.2 W. To maintain junction temperature ≤125°C, the HSOP-8 PowerPAD package requires a minimum 200 mm² copper pour connected to the exposed pad (EP) on inner or outer PCB layers. Thermal vias (≥6×0.3 mm) to internal ground planes are strongly recommended to achieve the specified RθJA of 60°C/W.
Is LM22673QMRX-5.0/NOPB compatible with WEBENCH® design tools?
Yes, LM22673QMRX-5.0/NOPB is fully WEBENCH® enabled. TI's WEBENCH® Designer tool supports complete schematic generation, BOM creation, efficiency simulation, thermal analysis, and PCB layout guidance for this part. Users can input input/output specifications and constraints to auto-generate optimized designs-including inductor, capacitor, and diode selection-with real-time performance validation.
LM22673QMRX-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:
- 3A
- 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
LM22673QMRX-5.0/NOPB FAQ
1.How can I place an order for LM22673QMRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673QMRX-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 LM22673QMRX-5.0/NOPB reliable?
The price and inventory of LM22673QMRX-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 LM22673QMRX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673QMRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673QMRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673QMRX-5.0/NOPB?
LM22673QMRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673QMRX-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 LM22673QMRX-5.0/NOPB?
For technical support, including LM22673QMRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673QMRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22673QMRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673QMRX-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 LM22673QMRX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673QMRX-5.0/NOPB?
All LM22673QMRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673QMRX-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 LM22673QMRX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22673QMRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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