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Texas Instruments LM22673TJ-ADJ/NOPB
- Part No.:
- LM22673TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22673TJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,144
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Product details
Overview
LM22673TJ-ADJ/NOPB from Texas Instruments is a 42 V, 3 A step-down DC/DC regulator in HSOP-8 PowerPAD package, featuring adjustable output (≥1.285 V), 500 kHz fixed-frequency voltage-mode control, and integrated 120 mΩ N-channel MOSFET. It delivers >90% efficiency in industrial power supplies converting 24 V input to 3.3 V/3 A output.
For engineers reviewing the LM22673TJ-ADJ/NOPB datasheet, LM22673TJ-ADJ/NOPB pinout, LM22673TJ-ADJ/NOPB application, or LM22673TJ-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), adjustable current limit via IADJ pin, internal compensation for ≤5 V outputs, thermal shutdown at 150°C, and compatibility with low-ESR ceramic capacitors.
Technical Context
The LM22673TJ-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across input variations, enabling optimized transient response. Its internal Type III compensation is tuned for output voltages ≤5 V, and it uses a bootstrap gate driver requiring external BOOT–SW capacitor recharging during minimum off-time (100 ns).
It integrates undervoltage lockout (UVLO rising threshold 4.3 V), adjustable soft-start via SS pin capacitor, and peak current limiting with foldback mode under severe overload. The device enters thermal shutdown at 150°C and recovers at ~135°C.
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 48 V industrial rails without pre-regulation. |
| Output Current | Up to 3 A continuous - sufficient for powering FPGA cores, microcontrollers, and analog subsystems. |
| Switching Frequency | 500 kHz ±20% - enables compact magnetics and low-output-ripple designs with standard 10 µH inductors. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; used with external resistor divider for precise VOUT tuning. |
| RDS(ON) | 120 mΩ (typ) - determines conduction loss and thermal rise at full load; measured in HSOP-8 PowerPAD package. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive-grade environments per LM22673-Q1 AEC-Q100 Grade 1 spec. |
| Quiescent Current | 3.4 mA (typ) - defines no-load power loss; critical for battery-backed or always-on systems. |
Pinout & Package
LM22673TJ-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 60°C/W). Pin 1 is SW; Pin 2 is VIN; Pin 3 is BOOT; Pin 4 is GND; Pin 5 is IADJ; Pin 6 is FB; Pin 7 is SS; Pin 8 is NC (not connected, thermally conductive only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor and catch diode anode; swings between ~0 V and VIN; requires low-inductance layout. |
| VIN (Pin 2) | Power input | Supplies IC bias and high-side gate driver; must be decoupled with ≥10 µF ceramic near pin. |
| BOOT (Pin 3) | Bootstrap supply | Drives high-side MOSFET gate; requires 10 nF ceramic capacitor between BOOT and SW pins. |
| GND (Pin 4) | System ground | Analog and power ground reference; connects to exposed pad for thermal and electrical integrity. |
| IADJ (Pin 5) | Current limit adjust | Sets peak switch current (3.35–5.5 A) via resistor to GND; floating defaults to 4.2 A typ. |
| FB (Pin 6) | Feedback input | High-impedance (230 nA bias) node sensing output voltage divider; sensitive to noise-place close to IC. |
| SS (Pin 7) | Soft-start control | Controls output ramp time via external capacitor; default internal ramp is ~500 µs. |
| NC (Pin 8) | No connection | Not electrically bonded; serves as thermal conductor-connect exposed pad to GND for cooling. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates external compensation network-reduces BOM count and design iteration for outputs ≤5 V. |
| Adjustable current limit via single resistor | Enables optimization of inductor/diode ratings and thermal margin without changing IC; accuracy ±25%/+35%. |
| Integrated bootstrap diode | Removes need for external bootstrap diode-simplifies layout and improves reliability in high-duty-cycle applications. |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R MLCCs instead of bulk electrolytics-enables smaller footprint, longer life, and lower ESR. |
| WEBENCH®-enabled design support | Provides automated component selection, thermal simulation, and Build-It board validation-accelerates time-to-prototype. |
Applications
| Industrial PLC Power Supply | Telecom Remote Radio Unit |
|---|---|
Use Scenario: Regulating 24 V backplane to 3.3 V for FPGA I/O banks and ADC drivers in harsh factory environments. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3 V/3 A with UVLO and thermal protection. Use Value: 120 mΩ RDS(ON) and 60°C/W thermal resistance enable full-load operation at 70°C ambient without heatsink. |
Use Scenario: Converting 48 V telecom rectified rail to 5 V for RF front-end amplifiers and clock distribution circuits. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator supporting wide line variation (36–72 V) with tight load regulation. Use Value: 42 V absolute max rating and 4.3 V UVLO threshold ensure reliable startup and brownout immunity across telecom voltage ranges. |
| Automotive Body Control Module | Embedded System Point-of-Load |
Use Scenario: Deriving 1.8 V for microcontroller core from 12 V battery rail in AEC-Q100-compliant body electronics. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with soft-start and current foldback for short-circuit robustness. Use Value: Adjustable IADJ pin allows setting 2.5 A current limit to match MCU peak demand-reducing inductor size and cost. |
Use Scenario: Generating 1.2 V for SoC memory interface from 5 V intermediate rail on compact edge AI inference boards. IC Role / Device Role / Timing Role: Compact, high-efficiency point-of-load regulator with minimal external components. Use Value: HSOP-8 PowerPAD package (4.89 × 3.90 mm) and internal compensation reduce solution area by >30% vs discrete controller + MOSFET. |
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-ADJ/NOPB | Lower 37 V max input, 2.5 A output, same 500 kHz frequency and HSOP-8 package. | Better suited for 12 V/24 V-only systems where 42 V capability is unnecessary. | Select when input never exceeds 37 V and 3 A output is not required-lower cost and thermal footprint. |
| TPS54340DDAR | 42 V input, 3.5 A output, current-mode control, SO-8 package without PowerPAD. | Higher current capability but higher RθJA (85°C/W); lacks integrated boot diode and IADJ adjust. | Choose for higher output current or current-mode loop preference-requires external bootstrap diode and compensation. |
Compared with LM22673TJ-ADJ/NOPB, LM22670TJ-ADJ/NOPB trades input voltage headroom for lower cost and thermal resistance, while TPS54340DDAR offers higher current and current-mode control at the expense of added external components and reduced thermal performance.
Availability
LM22673TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and automotive body electronics requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22673TJ-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, with over 50 years of innovation in power conversion ICs.
The LM22673 product line delivers SIMPLE SWITCHER® buck regulators targeting high-voltage industrial, automotive, and telecom applications where ease-of-use, thermal robustness, and minimal external components are critical.
FAQ
What is the minimum output voltage achievable with LM22673TJ-ADJ/NOPB?
The LM22673TJ-ADJ/NOPB has a feedback reference voltage of 1.285 V (typ), which sets the lowest possible output voltage when using the adjustable version. With proper resistor divider design and layout, stable regulation down to 1.285 V is achievable. Output voltages below this value are not supported due to internal reference limitation.
Does LM22673TJ-ADJ/NOPB require an external bootstrap diode?
No, LM22673TJ-ADJ/NOPB integrates a bootstrap diode internally. Only a 10 nF ceramic capacitor between BOOT and SW pins is required to complete the high-side gate drive circuit-eliminating the need for an external diode and reducing component count and layout complexity.
How is current limit adjusted on LM22673TJ-ADJ/NOPB?
LM22673TJ-ADJ/NOPB uses the IADJ pin to set peak switch current limit. Connecting a resistor between IADJ and GND adjusts the limit from 3.35 A to 5.5 A per Figure 12 in the datasheet. Floating IADJ defaults to 4.2 A (typ); resistor tolerance and temperature drift affect final accuracy (±25%/+35%).
What package type does LM22673TJ-ADJ/NOPB use, and how is thermal performance achieved?
LM22673TJ-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package with an exposed thermal pad. Thermal performance relies on soldering this pad directly to a large PCB copper area connected to system ground, achieving RθJA = 60°C/W. This enables full 3 A load operation at 70°C ambient without additional heatsinking.
Is LM22673TJ-ADJ/NOPB compatible with ceramic output capacitors?
Yes, LM22673TJ-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic capacitors, including X5R and X7R MLCCs. This eliminates the need for aluminum or tantalum electrolytics, improving reliability, reducing size, and enabling high-frequency ripple suppression without phase-margin degradation.
LM22673TJ-ADJ/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:
- 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:
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM22673TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673TJ-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 LM22673TJ-ADJ/NOPB reliable?
The price and inventory of LM22673TJ-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 LM22673TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673TJ-ADJ/NOPB?
LM22673TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673TJ-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 LM22673TJ-ADJ/NOPB?
For technical support, including LM22673TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673TJ-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 LM22673TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673TJ-ADJ/NOPB?
All LM22673TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673TJ-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 LM22673TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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