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Texas Instruments LM22673MRX-ADJ/NOPB
- Part No.:
- LM22673MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:6,047
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Product details
Overview
LM22673MRX-ADJ/NOPB from Texas Instruments is a 42 V, 3 A adjustable-output synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 120 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy, and supports output voltages as low as 1.285 V. It is used in industrial power rails converting 24 V or 12 V inputs to stable 3.3 V or 5 V system supplies.
For engineers reviewing the LM22673MRX-ADJ/NOPB datasheet, LM22673MRX-ADJ/NOPB pinout, LM22673MRX-ADJ/NOPB application, or LM22673MRX-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), adjustable current limit via IADJ pin, integrated bootstrap diode, thermal shutdown at 150°C, and internal voltage-mode compensation optimized for outputs ≤5 V.
Technical Context
The LM22673MRX-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal Type III compensation network eliminates external compensation components for standard buck topologies with ceramic output capacitors.
It features a dedicated BOOT-SW bootstrap supply path requiring a 10 nF ceramic capacitor, a programmable peak current limit set by resistor on IADJ pin (default 4.2 A), and soft-start timing controlled by external capacitor on SS pin. UVLO activates at 4.3 V (rising) and 3.9 V (falling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from 24 V industrial rails and automotive battery transients. |
| Output Current | Up to 3 A continuous - sufficient for FPGA core logic, microcontroller subsystems, and sensor interface rails. |
| Switching Frequency | 500 kHz - enables compact magnetics and low-output-ripple designs without EMI filter complexity. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum output voltage and defines precision of resistive divider-based regulation. |
| RDS(ON) | 120 mΩ (PFM package) - determines conduction loss and thermal rise at full load; matched to HSOP-8 thermal resistance of 22°C/W. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications. |
| Soft-Start Time | Adjustable via SS pin capacitor (100 nF–1 µF) - prevents inrush current and stabilizes startup into large capacitive loads. |
Pinout & Package
LM22673MRX-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 22°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Connects to inductor and catch diode anode; swings between GND and VIN during operation. |
| 2 VIN | Main Input Supply | Primary power input (4.5–42 V); bypassed locally with ceramic capacitor to minimize high-frequency noise. |
| 3 BOOT | Bootstrap Supply Input | Drives high-side MOSFET gate via external 10 nF capacitor to SW; requires short, low-inductance routing. |
| 4 GND | Power Ground | System return path for input/output currents; tied directly to exposed thermal pad. |
| 5 IADJ | Current Limit Adjust | Resistor-to-GND sets peak switch current (1.5–5.5 A range); open-circuit defaults to 4.2 A. |
| 6 FB | Feedback Input | High-impedance (230 nA bias) node sensing output voltage via resistive divider; placement critical for noise immunity. |
| 7 SS | Soft-Start Control | Sinks 50 µA current to charge external capacitor; controls output ramp rate and prevents overshoot. |
| 8 EP (Exposed Pad) | Thermal & Electrical Ground | Mandatory connection to PCB ground plane for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Voltage Mode Control | Eliminates need for external compensation network - reduces BOM count and design iteration time for standard buck layouts. |
| Stable with Low-ESR Ceramic Capacitors | Enables use of compact, high-reliability MLCCs instead of bulkier electrolytics - improves long-term stability and temperature performance. |
| Adjustable Current Limit | Single resistor on IADJ pin allows precise tailoring of overcurrent protection threshold - avoids oversized magnetics and saves board space. |
| Integrated Bootstrap Diode | Reduces external component count by eliminating discrete bootstrap diode - simplifies layout and improves reliability in high-duty-cycle applications. |
| WEBENCH® Enabled | Full parametric design support including component selection, thermal simulation, and schematic generation - accelerates time-to-prototype. |
Applications
| Industrial Motor Drives | Telecom Line Cards |
|---|---|
Use Scenario: Powering gate drivers, isolated ADCs, and communication interfaces in variable-frequency drives operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3 V/5 V rails with fast transient response to handle PWM switching noise. Use Value: 500 kHz switching and internal compensation ensure stable output under rapid load steps from digital control logic and analog signal chains. | Use Scenario: Generating local 3.3 V supply for FPGA, PHY, and SerDes on telecom line cards fed from –48 V or 24 V backplane. IC Role / Device Role / Timing Role: High-voltage buck converter stepping down intermediate 12 V rail to low-noise logic supply with minimal external components. Use Value: 42 V input rating and 120 mΩ RDS(ON) enable efficient conversion at high ambient temperatures common in dense line card environments. |
| Automotive Body Control Modules | Embedded IoT Gateways |
Use Scenario: Providing 5 V and 3.3 V rails in BCMs powered from 12 V battery with cold-crank (4.5 V) and load-dump (42 V) transients. IC Role / Device Role / Timing Role: Robust primary regulator with UVLO (4.3 V turn-on) and thermal shutdown (150°C) ensuring safe operation across automotive temperature extremes. Use Value: AEC-Q100 Grade 1 qualification (–40°C to +125°C) and integrated protection features eliminate need for external supervision circuitry. | Use Scenario: Powering ARM Cortex-M based controllers, Wi-Fi/BLE modules, and environmental sensors in battery-backed or PoE-powered edge devices. IC Role / Device Role / Timing Role: Efficient point-of-load regulator converting 12 V PoE midspan or 24 V industrial input to low-voltage system rails. Use Value: Adjustable output (≥1.285 V) and soft-start control enable compatibility with diverse SoC core voltage requirements and prevent brownout during wake-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 |
|---|---|---|---|
| LM22674MRX-ADJ/NOPB | Same architecture but 2.5 A rated; lower RDS(ON) (100 mΩ), same 500 kHz frequency and pinout. | Lower max output current; suitable where thermal budget or load current is constrained. | Select when 2.5 A suffices and smaller solution size or lower conduction loss is prioritized. |
| TPS54340DDAR | 42 V, 3.5 A buck with adjustable frequency (100–2.5 MHz), no integrated bootstrap diode, different pinout. | Requires external bootstrap diode and external compensation; offers higher switching frequency flexibility. | Select when higher frequency (>500 kHz) or programmable frequency is required for ultra-compact designs. |
Compared with LM22673MRX-ADJ/NOPB, LM22674MRX-ADJ/NOPB offers reduced conduction loss at lower current, while TPS54340DDAR trades integration for frequency agility and higher current headroom - choice depends on thermal constraints, layout space, and control-loop tuning requirements.
Availability
LM22673MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, and automotive body control modules requiring stable component supply across extended temperature ranges and high-input-voltage conditions.
Supply support for LM22673MRX-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 90 years of innovation history.
The LM22673MRX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in high-voltage DC/DC conversion with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the minimum output voltage supported by the LM22673MRX-ADJ/NOPB?
The LM22673MRX-ADJ/NOPB supports a minimum output voltage of 1.285 V, defined by its internal feedback reference voltage. This value is specified at 25°C and maintains ±1.5% accuracy across the full operating junction temperature range of –40°C to +125°C. The actual output is set using an external resistive divider connected to the FB pin, with RFBB typically selected as 1 kΩ to balance noise immunity and load current requirements. LM22673MRX-ADJ/NOPB achieves this low output capability without requiring external compensation components due to its internally optimized loop for sub-5 V outputs.
How does the IADJ pin adjust current limit on the LM22673MRX-ADJ/NOPB?
The IADJ pin on the LM22673MRX-ADJ/NOPB sets the peak switch current limit by sinking a reference current that scales the internal current-sense threshold. A resistor connected between IADJ and GND establishes a voltage divider that fixes the pin at ~0.8 V during startup, determining the final current limit between 1.5 A and 5.5 A per Figure 12 in the datasheet. An open IADJ pin defaults to 4.2 A (typ). Accuracy of adjusted limits is ±35%/–25%, and resistor values must stay within the validated range shown in the datasheet curve to avoid malfunction. LM22673MRX-ADJ/NOPB uses this feature to allow safe derating for smaller inductors or tighter thermal budgets without redesigning the entire power stage.
Can the LM22673MRX-ADJ/NOPB operate with ceramic output capacitors only?
Yes, the LM22673MRX-ADJ/NOPB is explicitly designed and characterized for stable operation with low-ESR ceramic output capacitors - a key advantage over older buck regulators requiring electrolytic or tantalum types. Its internal Type III compensation and voltage-mode architecture maintain phase margin >45° across typical ceramic capacitor values (e.g., 22 µF–100 µF X7R) and ESR down to 5 mΩ. This eliminates series resistors or parallel RC networks traditionally needed for stability, reducing component count and improving reliability. LM22673MRX-ADJ/NOPB's stability is verified across temperature and load with ceramic-only designs, and TI's WEBENCH® tool validates capacitor selection automatically.
What is the purpose of the BOOT pin on the LM22673MRX-ADJ/NOPB?
The BOOT pin on the LM22673MRX-ADJ/NOPB provides the floating gate drive voltage for the internal high-side N-channel MOSFET. It connects externally to a 10 nF ceramic capacitor between BOOT and SW pins, which charges during the low-side conduction phase and supplies the gate-source voltage needed to fully enhance the high-side switch. Proper layout - short, wide traces and tight capacitor placement - is essential to minimize parasitic inductance and prevent gate drive collapse. LM22673MRX-ADJ/NOPB integrates a bootstrap diode, eliminating the need for an external diode and simplifying layout while maintaining reliable operation up to 95% duty cycle.
Does the LM22673MRX-ADJ/NOPB require external compensation components?
No, the LM22673MRX-ADJ/NOPB features fully internal loop compensation optimized for standard buck configurations with ceramic output capacitors and inductors in the recommended range. Its Type III compensation network is factory-trimmed and does not require external resistors or capacitors - a core benefit of the SIMPLE SWITCHER® architecture. This eliminates manual compensation calculations and iterative stability testing for most applications. LM22673MRX-ADJ/NOPB's internal compensation is specifically tuned for output voltages ≤5 V; for higher outputs, TI recommends using the LM22673-5.0 variant with an external divider to preserve loop bandwidth and transient response.
LM22673MRX-ADJ/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:
- 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:
- 8-SO PowerPad
LM22673MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22673MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673MRX-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 LM22673MRX-ADJ/NOPB reliable?
The price and inventory of LM22673MRX-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 LM22673MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673MRX-ADJ/NOPB?
LM22673MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673MRX-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 LM22673MRX-ADJ/NOPB?
For technical support, including LM22673MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673MRX-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 LM22673MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673MRX-ADJ/NOPB?
All LM22673MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673MRX-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 LM22673MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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