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Texas Instruments LM22673TJ-5.0/NOPB
- Part No.:
- LM22673TJ-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22673TJ-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263-7
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM22673TJ-5.0/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD package, delivering fixed 5.0 V output with ±1.5% feedback reference accuracy, 500 kHz switching frequency, and integrated 120 mΩ N-channel MOSFET. It operates across –40°C to +125°C junction temperature and supports industrial control, telecom power conversion, and embedded systems requiring stable 5 V rails from 4.5–42 V inputs.
For engineers reviewing the LM22673TJ-5.0/NOPB datasheet, LM22673TJ-5.0/NOPB pinout, LM22673TJ-5.0/NOPB application, or LM22673TJ-5.0/NOPB equivalent, key selection factors include its internally compensated voltage-mode control, adjustable current limit via IADJ pin, integrated bootstrap diode, soft-start programmability, and thermal shutdown at 150°C - all critical for robust 5 V point-of-load designs.
Technical Context
The LM22673TJ-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain against VIN variation, enabling optimized transient response without external compensation. Its internal type III compensation network is tuned for fixed 5 V output stability with ceramic output capacitors.
It integrates a 42 V-rated N-channel MOSFET switch (120 mΩ typical RDS(ON) in HSOP-8), bootstrap gate drive with dedicated BOOT/SW pins, undervoltage lockout (UVLO rising threshold 4.3 V), and cycle-by-cycle peak current limiting with foldback protection during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive input rails including 12 V, 24 V, and 48 V nominal systems. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider, simplifying layout and improving accuracy over temperature. |
| Max Output Current | 3 A continuous - sufficient for powering microcontrollers, FPGAs, sensors, and interface ICs in compact designs. |
| Switching Frequency | 500 kHz - enables use of small inductors (e.g., 4.7–10 µH) and low-ESR ceramic capacitors while maintaining good transient response. |
| RDS(ON) | 120 mΩ (typ) - reduces conduction losses and improves efficiency (>90% typical at mid-load) in HSOP-8 PowerPAD package. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including industrial automation and telecom infrastructure. |
| Soft-Start Time | Programmable via SS pin capacitor - default ~500 µs; extended up to milliseconds using 100 nF–1 µF external capacitor. |
| Current Limit | Adjustable 3.35–5.5 A via resistor on IADJ pin - allows optimization of inductor/diode sizing and fault margin without changing IC. |
Pinout & Package
LM22673TJ-5.0/NOPB uses the HSOP-8 PowerPAD (exposed pad) package (4.89 mm × 3.90 mm), where the exposed pad must be soldered to a thermal pad on PCB for optimal heat dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external inductor; connects to cathode of Schottky diode and boot capacitor negative terminal. |
| 2 VIN | Input Supply | Primary DC input (4.5–42 V); requires local 10 µF ceramic bypass capacitor near pin. |
| 3 BOOT | Bootstrap Supply | Connects to 10 nF ceramic capacitor between BOOT and SW; supplies gate drive for high-side MOSFET. |
| 4 GND | Power Ground | System ground return; tied directly to exposed pad for thermal and EMI performance. |
| 5 IADJ | Current Limit Adjust | Resistor-to-GND sets peak switch current (3.35–5.5 A); floating defaults to 4.2 A typical. |
| 6 FB | Feedback Input | Internally connected to 5.0 V reference; shorted to VOUT for fixed-output operation. |
| 7 SS | Soft-Start Control | Capacitor-to-GND extends startup ramp time; internal 500 µA current source charges external cap. |
| 8 EP | Exposed Pad | Thermal and electrical ground; must be soldered to ≥2 cm² copper area for RθJA = 60°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Voltage Mode Control | Eliminates need for external compensation components; stable with low-ESR ceramic output capacitors (≥10 µF). |
| Integrated Bootstrap Diode | Reduces BOM count and layout complexity; avoids discrete bootstrap diode placement and routing challenges. |
| Adjustable Peak Current Limit | Single resistor on IADJ pin enables precise current limiting (±25% accuracy) for custom overload protection and component optimization. |
| Thermal Shutdown & UVLO | Shuts down at 150°C junction temp and restarts at ~135°C; UVLO prevents operation below 4.3 V input (rising threshold). |
| WEBENCH® Enabled | Full design support in TI's WEBENCH Power Designer - includes component selection, efficiency simulation, thermal modeling, and BOM generation. |
| SO PowerPAD Package | HSOP-8 with exposed thermal pad delivers superior thermal performance vs. standard SOIC; RθJA = 60°C/W (JEDEC high-K board). |
Applications
| Industrial PLC I/O Module | Telecom Line Card Power |
|---|---|
|
Use Scenario: Powering isolated digital I/O channels, ADCs, and communication interfaces in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary 5 V point-of-load regulator converting 24 V input to clean, regulated 5 V for logic and sensing circuitry. Use Value: Delivers 3 A continuous current with <1.5% output tolerance across –40°C to +85°C ambient, ensuring reliable sensor data acquisition and fieldbus communication. |
Use Scenario: Generating 5 V supply for FPGA configuration, SerDes transceivers, and management processors on telecom line cards fed from –48 V or 24 V backplane. IC Role / Device Role / Timing Role: High-efficiency buck converter providing tightly regulated 5 V rail with fast transient response to handle bursty packet processing loads. Use Value: 500 kHz switching and internal compensation enable compact 12 mm × 12 mm layout; thermal pad ensures operation at full load in confined card slots. |
| Automotive Body Control Module | Embedded Edge Gateway |
|
Use Scenario: Supplying 5 V to microcontroller, CAN transceivers, and LED drivers in body electronics modules powered from 12 V battery with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Input-robust DC/DC regulator with 42 V absolute max rating and UVLO, protecting downstream circuits during automotive voltage excursions. Use Value: Withstands 40 V load-dump pulses per ISO 7637-2; fixed 5.0 V output eliminates feedback resistor drift concerns in long-life automotive applications. |
Use Scenario: Powering ARM-based SoC, Wi-Fi/BLE modules, and industrial IoT sensors in edge gateways running from 12–24 V PoE or adapter inputs. IC Role / Device Role / Timing Role: Primary system regulator delivering low-noise 5 V to SoC core and peripherals, with soft-start preventing inrush current on hot-plug insertion. Use Value: Adjustable current limit allows matching to SoC peak current profile; SS pin enables controlled power-up sequencing with other subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670TJ-5.0/NOPB | Lower 36 V max input, same 5 V fixed output, 3 A rating, and HSOP-8 package; RDS(ON) = 150 mΩ (vs. 120 mΩ). | Suitable for 12/24 V systems only; less margin for 42 V transients or 36 V industrial rails. | Select when input never exceeds 36 V and cost sensitivity outweighs efficiency/thermal advantage of LM22673TJ-5.0/NOPB. |
| TPS54340DDAR | 42 V input, 3 A, adjustable output; requires external feedback resistors; no integrated bootstrap diode; SO-8 package without exposed pad. | Needs external compensation and bootstrap diode; higher thermal resistance (RθJA ≈ 80°C/W) limits full-load operation in compact layouts. | Choose when adjustable output voltage is required or when existing designs already use TPS54340 footprint and BOM. |
Compared with LM22670TJ-5.0/NOPB, LM22673TJ-5.0/NOPB provides higher input voltage margin and lower RDS(ON) for better efficiency in 42 V systems; versus TPS54340DDAR, it offers fixed 5 V simplicity, integrated bootstrap diode, and superior thermal performance via PowerPAD - reducing need for heatsinking in space-constrained edge devices.
Availability
LM22673TJ-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded systems requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability under extended temperature operation.
Supply support for LM22673TJ-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 decades of expertise in high-reliability DC/DC conversion solutions.
The LM22673 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in rugged, high-input-voltage buck applications where minimal external components, internal compensation, and robust thermal performance are essential.
FAQ
What is the maximum input voltage rating for LM22673TJ-5.0/NOPB?
The LM22673TJ-5.0/NOPB has an absolute maximum input voltage rating of 43 V, with recommended operating range from 4.5 V to 42 V. This makes it suitable for industrial 24 V and automotive 12 V systems with load-dump transients, as well as telecom 48 V intermediate bus applications. Exceeding 42 V continuously may trigger UVLO or reduce reliability.
Does LM22673TJ-5.0/NOPB require external compensation components?
No, LM22673TJ-5.0/NOPB features fully internal voltage-mode loop compensation optimized for fixed 5 V output. No external RC networks are needed - only standard input/output capacitors, inductor, and Schottky diode are required for basic operation. This simplifies design, reduces BOM count, and improves consistency across production units.
How is the current limit adjusted on LM22673TJ-5.0/NOPB?
The current limit on LM22673TJ-5.0/NOPB is set by connecting a resistor between the IADJ pin and GND. A floating IADJ defaults to ~4.2 A typical; adding a resistor scales the limit linearly from ~3.35 A to 5.5 A. Resistor values range from 10 kΩ (3.35 A) to open (4.2 A) to 2.2 kΩ (5.5 A), per Figure 12 in the datasheet. Accuracy is ±25% for adjusted settings.
What package type does LM22673TJ-5.0/NOPB use, and how should the exposed pad be handled?
LM22673TJ-5.0/NOPB uses the HSOP-8 PowerPAD package (4.89 mm × 3.90 mm) with an exposed thermal pad. The pad must be soldered to a solid copper ground plane on the PCB - minimum 2 cm² recommended - to achieve specified RθJA = 60°C/W and ensure safe 3 A operation at elevated ambient temperatures.
Can LM22673TJ-5.0/NOPB be used in automotive applications?
Yes - while LM22673TJ-5.0/NOPB itself is not AEC-Q100 qualified, it shares architecture and specs with the pin-compatible LM22673-Q1 (AEC-Q100 Grade 1, –40°C to +125°C). Its 42 V input rating, UVLO, thermal shutdown, and robust SO PowerPAD package make it widely deployed in non-safety-critical automotive body electronics where qualification is not mandated.
LM22673TJ-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-7 Thin
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22673TJ-5.0/NOPB FAQ
1.How can I place an order for LM22673TJ-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673TJ-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 LM22673TJ-5.0/NOPB reliable?
The price and inventory of LM22673TJ-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 LM22673TJ-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673TJ-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673TJ-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673TJ-5.0/NOPB?
LM22673TJ-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673TJ-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 LM22673TJ-5.0/NOPB?
For technical support, including LM22673TJ-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673TJ-5.0/NOPB requirements.
6.How does Aetrix verify that LM22673TJ-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673TJ-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 LM22673TJ-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673TJ-5.0/NOPB?
All LM22673TJ-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673TJ-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 LM22673TJ-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22673TJ-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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