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Texas Instruments LM22673QMRX-ADJ/NOPB
- Part No.:
- LM22673QMRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673QMRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
LM22673QMRX-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 down to 1.285 V output, and supports input voltages from 4.5 V to 42 V. It is used in industrial control power rails requiring high-voltage input tolerance and stable 3.3 V or 5 V generation.
For engineers reviewing the LM22673QMRX-ADJ/NOPB datasheet, LM22673QMRX-ADJ/NOPB pinout, LM22673QMRX-ADJ/NOPB application, or LM22673QMRX-ADJ/NOPB equivalent, key selection criteria include its adjustable current limit via IADJ pin, internal voltage-mode compensation optimized for ≤5 V outputs, integrated bootstrap diode, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22673QMRX-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network eliminates external compensation components for standard buck topologies delivering ≤5 V outputs.
It features a dedicated BOOT-SW bootstrap supply path with minimum off-time enforcement (100 ns) to ensure gate driver recharge, and uses a precision 1.285 V internal reference with 230 nA feedback bias current to support high-accuracy resistive divider networks for output programming.
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 Voltage Range | 1.285 V to 42 V (adjustable via FB divider) - minimum setpoint defined by internal 1.285 V reference. |
| Switching Frequency | 500 kHz (±20%) - enables compact magnetics and ceramic output capacitors; fixed-frequency operation simplifies EMI filtering. |
| Max Output Current | 3 A continuous - limited by internal 120 mΩ N-channel MOSFET RDS(ON) and thermal design in HSOP-8 PowerPAD package. |
| Feedback Reference | 1.285 V ±1.5% - high-accuracy reference enables tight output regulation; bias current 230 nA allows use of high-value dividers. |
| Current Limit | 4.2 A typical (adjustable via IADJ pin resistor) - programmable peak switch current enables optimization for lower-current applications. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and automotive-grade environments (Q1 variant available). |
Pinout & Package
LM22673QMRX-ADJ/NOPB is housed in an HSOP-8 PowerPAD package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJA = 60°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external inductor; connects to cathode of external Schottky diode and BOOT capacitor negative terminal. |
| 2 VIN | Power Input | Primary input supply (4.5–42 V); bypassed with ≥10 µF ceramic capacitor near pin. |
| 3 BOOT | Bootstrap Supply | Connects to SW and 10 nF ceramic capacitor; supplies gate drive voltage for internal high-side MOSFET. |
| 4 GND | Ground Reference | Analog and power ground return; tied directly to exposed thermal pad (must be connected to PCB ground plane). |
| 5 IADJ | Current Limit Adjust | Resistor-to-GND sets peak switch current (0–4.2 A range); floating defaults to 4.2 A. |
| 6 FB | Feedback Input | High-impedance (230 nA) node sensing output voltage divider; determines regulated output via 1.285 V reference. |
| 7 SS | Soft-Start Control | Capacitor-to-GND extends startup ramp time; internal 50 µA current source charges external cap for controlled VOUT rise. |
| 8 NC | No Connect | Not electrically bonded; serves as thermal conductor only - must be grounded for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Diode | Eliminates external bootstrap diode; reduces BOM count and layout area while maintaining reliable high-side gate drive. |
| Adjustable Current Limit | Single resistor on IADJ pin scales peak switch current from ~1.5 A to 4.2 A - enables component downsizing in low-power variants. |
| Internal Type III Compensation | Enables stable operation with standard buck LC networks without external compensation components - reduces design iteration time. |
| UVLO with Hysteresis | Rising threshold 4.3 V / falling threshold 3.9 V - prevents erratic startup during brown-out conditions on wide-input industrial supplies. |
| Thermal Shutdown Protection | Activates at 150°C junction temperature and releases at ~135°C - protects device and system under sustained overload or poor heatsinking. |
Applications
| Industrial Motor Drives | Telecom Line Cards |
|---|---|
|
Use Scenario: Powering FPGA I/O banks and microcontroller cores from 24 V or 48 V backplane rails in programmable logic controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering tightly regulated 3.3 V/1.8 V with fast transient response to digital load steps. Use Value: 500 kHz switching enables small 2.2 µH inductors and 22 µF ceramic output caps; ±1.5% reference ensures logic-level compliance across temperature. |
Use Scenario: Generating 5 V standby and 3.3 V active rails in telecom line interface cards fed from –48 V DC distribution (with intermediate 12 V conversion). IC Role / Device Role / Timing Role: Secondary buck stage converting intermediate 12 V to point-of-load 5 V/3.3 V with high efficiency (>90% at 2 A). Use Value: 42 V absolute max rating accommodates 12 V rail transients up to 18 V; internal compensation avoids tuning delays during qualification. |
| Automotive Body Control Modules | Embedded Medical Sensors |
|
Use Scenario: Regulating 5 V and 3.3 V from vehicle battery (9–16 V nominal, up to 42 V load dump) for MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: High-reliability buck regulator with automotive-qualified thermal and overvoltage robustness (Q1 variant available). Use Value: UVLO hysteresis prevents cycling during cranking; 125°C junction rating supports under-hood placement without derating. |
Use Scenario: Powering low-noise analog front-ends and ADCs in portable diagnostic devices powered by 12 V sealed lead-acid or Li-ion battery packs. IC Role / Device Role / Timing Role: Precision-adjustable buck stage delivering ultra-stable 2.5 V or 3.3 V reference-grade supplies with minimal ripple. Use Value: Low 230 nA FB bias current minimizes divider error; soft-start (SS pin) prevents inrush-induced sensor offset drift at power-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674QMRX-ADJ/NOPB | Same pinout, 500 kHz, but rated for 5 A output and 100 mΩ RDS(ON); higher thermal dissipation in same HSOP-8 package. | Better suited for 4–5 A loads where LM22673QMRX-ADJ/NOPB would require significant derating above 85°C ambient. | Select when >3 A continuous output or lower conduction loss is required without changing PCB layout. |
| TPS54340DDAR | 42 V, 3.5 A, 500 kHz; uses current-mode control instead of voltage-mode; requires external compensation; no integrated bootstrap diode. | Offers better line transient response and easier parallel operation, but increases design complexity and BOM count. | Prefer when dynamic performance under variable input is critical and design resources allow compensation tuning. |
Compared with LM22673QMRX-ADJ/NOPB, LM22674QMRX-ADJ/NOPB provides higher current headroom in identical footprint, while TPS54340DDAR trades integration for greater control flexibility - making LM22673QMRX-ADJ/NOPB optimal for cost-sensitive, space-constrained industrial designs needing plug-and-play stability.
Availability
LM22673QMRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, and embedded medical sensors requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM22673QMRX-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and communications focus.
The LM22673 product line delivers SIMPLE SWITCHER® step-down regulators targeting high-input-voltage industrial and automotive applications where ease of design, thermal robustness, and wide VIN range are critical.
FAQ
What is the minimum output voltage achievable with LM22673QMRX-ADJ/NOPB?
The LM22673QMRX-ADJ/NOPB achieves a minimum output voltage of 1.285 V, set by its internal precision reference. This value is specified over temperature (–40°C to +125°C) with ±1.5% accuracy. Output voltages below this level cannot be regulated, as the feedback amplifier requires at least the reference voltage at the FB pin to maintain control loop stability.
Does LM22673QMRX-ADJ/NOPB require an external bootstrap diode?
No, LM22673QMRX-ADJ/NOPB integrates a bootstrap diode internally. The BOOT pin connects directly to the SW node and a 10 nF ceramic capacitor - no external diode is needed. This integration reduces component count, PCB area, and potential failure points compared to controllers requiring discrete bootstrap solutions.
How is current limit adjusted on LM22673QMRX-ADJ/NOPB?
Current limit on LM22673QMRX-ADJ/NOPB is adjusted using a single resistor between the IADJ pin and GND. With IADJ floating, the default limit is 4.2 A. Adding a resistor pulls the pin to ~0.8 V, scaling peak switch current linearly - e.g., 10 kΩ yields ~1.5 A. Accuracy degrades to ±35%/–25% versus the default specification.
What package type does LM22673QMRX-ADJ/NOPB use, and how is thermal performance achieved?
LM22673QMRX-ADJ/NOPB uses the HSOP-8 PowerPAD package (4.89 mm × 3.90 mm) with an exposed thermal pad. Thermal performance relies on soldering this pad to a large PCB copper area connected to system ground - achieving RθJA = 60°C/W. The pad must not be left floating, as it serves both thermal and electrical grounding functions.
Is LM22673QMRX-ADJ/NOPB suitable for automotive applications?
The LM22673QMRX-ADJ/NOPB is the commercial-grade version. For automotive use, TI offers the LM22673Q1 variant (e.g., LM22673Q1MRX-ADJ/NOPB), which is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and undergoes additional stress testing. LM22673QMRX-ADJ/NOPB itself is not automotive-qualified and lacks the Q1's enhanced reliability screening.
LM22673QMRX-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22673QMRX-ADJ/NOPB FAQ
1.How can I place an order for LM22673QMRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673QMRX-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 LM22673QMRX-ADJ/NOPB reliable?
The price and inventory of LM22673QMRX-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 LM22673QMRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673QMRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673QMRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673QMRX-ADJ/NOPB?
LM22673QMRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673QMRX-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 LM22673QMRX-ADJ/NOPB?
For technical support, including LM22673QMRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673QMRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673QMRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673QMRX-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 LM22673QMRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673QMRX-ADJ/NOPB?
All LM22673QMRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673QMRX-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 LM22673QMRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673QMRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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