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Texas Instruments LM22673MR-ADJ/NOPB
- Part No.:
- LM22673MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,852
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Product details
Overview
LM22673MR-ADJ/NOPB from Texas Instruments is a 42 V, 3 A step-down DC/DC voltage regulator in an HSOP-8 PowerPAD package, featuring adjustable output (as low as 1.285 V), 500 kHz fixed switching frequency, and internal voltage-mode compensation. It integrates a 120 mΩ N-channel MOSFET switch and supports industrial power conversion from 24 V or 12 V rails.
For engineers reviewing the LM22673MR-ADJ/NOPB datasheet, LM22673MR-ADJ/NOPB pinout, LM22673MR-ADJ/NOPB application, or LM22673MR-ADJ/NOPB equivalent, key selection considerations include its adjustable current limit via IADJ pin, ±1.5% feedback reference accuracy, soft-start programmability, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22673MR-ADJ/NOPB employs a voltage-mode PWM architecture with input voltage feedforward to stabilize loop gain across input variations, enabling optimized transient response without external compensation. Its internal Type III compensation network is calibrated for stable operation with output voltages ≤5 V.
It incorporates a floating high-side gate driver powered by an external bootstrap capacitor between BOOT and SW pins, requiring ≥5 mA minimum load for full recharge during minimum off-time (100 ns). Undervoltage lockout activates at 4.3 V (rising) and 3.9 V (falling), preventing startup under insufficient bias conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and telecom input rails including 24 V, 12 V, and 5 V sources. |
| Output Voltage | Adjustable down to 1.285 V - set via external resistor divider on FB pin; enables precise regulation for modern low-voltage ICs. |
| Switching Frequency | 500 kHz (±20%) - enables compact magnetics and good transient response; fixed-frequency operation simplifies EMI filtering. |
| Max Output Current | 3 A continuous - limited by internal MOSFET RDS(ON) (120 mΩ) and thermal design; derates above 125°C junction temperature. |
| Feedback Reference | 1.285 V ±1.5% - high-accuracy reference ensures tight output regulation across temperature (–40°C to 125°C). |
| Current Limit | Programmable via IADJ pin - default 4.2 A (typ); adjustable down using external resistor; accuracy ±35%/–25% when adjusted. |
| Soft-Start Time | Internally ~500 µs - extended via external capacitor on SS pin (100 nF–1 µF); prevents inrush current and output overshoot. |
| Thermal Shutdown | 150°C activation - protects against sustained overload or poor PCB thermal design; auto-recovery at ~135°C. |
Pinout & Package
LM22673MR-ADJ/NOPB is housed in an HSOP-8 package with exposed thermal pad (PowerPAD), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a PCB copper pour connected to GND for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Drives external inductor; swings from GND to VIN; requires low-inductance layout and Schottky catch diode. |
| 2 VIN | Main Input Supply | Accepts 4.5–42 V; bypassed with ceramic capacitor near pin; powers internal circuitry and high-side driver. |
| 3 BOOT | Bootstrap Supply | Connects to SW via 10 nF ceramic capacitor; supplies gate drive for internal N-MOSFET; critical for proper high-side turn-on. |
| 4 GND | Power & Signal Ground | System common return; connects to exposed pad; must be low-impedance path for switching currents and feedback stability. |
| 5 IADJ | Current Limit Adjust | Resistor-to-GND sets peak switch current; open = default 4.2 A; voltage clamped at ~0.8 V internally. |
| 6 FB | Feedback Input | High-impedance (230 nA bias) node sensing output via resistor divider; determines regulated output voltage. |
| 7 SS | Soft-Start Control | Capacitor-to-GND extends startup ramp; internal 50 µA current source charges external cap; resets on shutdown. |
| 8 NC | No Connect | Not electrically bonded; serves only as thermal conductor; must not be routed or connected to signal nets. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Diode | Eliminates need for external bootstrap diode; reduces BOM count and layout complexity in buck topology. |
| Stable with Ceramic Capacitors | Designed for low-ESR ceramic output caps (no electrolytic required); improves reliability and reduces footprint. |
| Adjustable Soft-Start | Prevents input inrush and output overshoot; configurable from ~500 µs to >10 ms using single external capacitor. |
| WEBENCH® Enabled | Fully supported in TI's WEBENCH Designer tool for component selection, simulation, thermal analysis, and Build-It board generation. |
| Internal Loop Compensation | Removes need for external compensation network; simplifies design while maintaining stability for outputs ≤5 V. |
| Thermal & Current Protection | Combines cycle-by-cycle current limiting, thermal shutdown (150°C), and UVLO (4.3 V rising) for robust fault handling. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Powering gate drivers, isolated ADCs, and microcontrollers in variable-frequency drives operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V rail to 3.3 V/5 V logic supply with high line regulation and fast transient response. Use Value: Delivers 3 A at >90% efficiency while maintaining ±1.5% output accuracy across –40°C to 125°C ambient, ensuring reliable MCU operation under load transients. | Use Scenario: Generating intermediate 5 V or 3.3 V rails in 48 V telecom systems (e.g., PoE injectors, base station control cards). IC Role / Device Role / Timing Role: High-input-voltage buck converter supporting wide VIN range (up to 42 V) with integrated MOSFET and bootstrap diode. Use Value: Enables compact, low-noise 500 kHz switching design with minimal external components-reducing solution size versus discrete controller + FET approaches. |
| Embedded Control Units | Automotive Body Electronics |
Use Scenario: Powering ARM Cortex-M based controllers and CAN transceivers in factory automation PLC modules. IC Role / Device Role / Timing Role: Adjustable-output regulator providing flexible 1.8 V–5 V supplies; configured via FB divider with remote sensing capability. Use Value: Achieves tight output regulation (1.285 V ref ±1.5%) and programmable current limit-allowing safe operation with undersized inductors in space-constrained enclosures. | Use Scenario: Supplying infotainment subsystems (e.g., display backlight drivers, audio codecs) from 12 V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Robust buck regulator surviving automotive load-dump (42 V) and cold-crank (4.5 V) conditions per ISO 7637-2. Use Value: Maintains regulation during 4.5–42 V input transients; UVLO prevents erratic startup below 4.3 V; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674MR-ADJ/NOPB | Same pinout, 500 kHz, but rated for 5 A output; higher RDS(ON) (100 mΩ SO vs 120 mΩ HSOP); different thermal metrics (RθJA = 60°C/W vs 22°C/W). | Supports higher load currents; requires larger PCB copper area or forced air for thermal management at full load. | Select when >3 A continuous output is required and SO PowerPAD thermal performance is acceptable. |
| TPS54332DR | 3 A, 28 V max input, 570 kHz switching; no IADJ pin; uses external compensation; smaller 8-pin SOIC package (no exposed pad). | Lacks adjustable current limit and integrated bootstrap diode; requires more external components and careful loop tuning. | Choose for cost-sensitive designs where 28 V input suffices and layout space is constrained-accepting added design effort. |
Compared with LM22674MR-ADJ/NOPB, the LM22673MR-ADJ/NOPB offers superior thermal resistance in HSOP-8 PowerPAD but lower current rating; versus TPS54332DR, it provides simpler design-in via internal compensation and programmable protection features at the cost of larger footprint and higher VIN capability.
Availability
LM22673MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and embedded control units requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for LM22673MR-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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management ICs and system-level design tools.
The LM22673 product line delivers SIMPLE SWITCHER® buck regulators targeting high-reliability industrial, telecom, and automotive applications-designed for ease of use, minimal external components, and seamless integration with WEBENCH® design ecosystem.
FAQ
What is the minimum output voltage achievable with LM22673MR-ADJ/NOPB?
The LM22673MR-ADJ/NOPB achieves a minimum regulated output voltage of 1.285 V, set by its internal feedback reference voltage. This value is specified at ±1.5% accuracy over temperature (–40°C to 125°C) and forms the lower bound for all adjustable configurations using the FB pin divider. Output voltages below 1.285 V cannot be stably regulated.
Does LM22673MR-ADJ/NOPB require an external bootstrap diode?
No, the LM22673MR-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and SW pins. A 10 nF ceramic capacitor must still be placed directly between BOOT and SW with short, wide traces to ensure proper high-side gate drive and reliable MOSFET switching.
How is current limit adjusted on LM22673MR-ADJ/NOPB?
Current limit on LM22673MR-ADJ/NOPB is adjusted using a resistor from IADJ pin to GND. With IADJ open, the default limit is 4.2 A (typ). Connecting a resistor sets the limit per Figure 12 in the datasheet; accuracy degrades to +35%/–25% when adjusted. The part samples IADJ voltage ~100 µs after startup and holds that setting until next power cycle.
What package type is used for LM22673MR-ADJ/NOPB?
The LM22673MR-ADJ/NOPB uses an HSOP-8 (Heat Sink Over-molded Plastic) package with exposed thermal pad (PowerPAD), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a GND-connected copper pour for thermal dissipation and electrical stability-critical for achieving rated 3 A output current.
Can LM22673MR-ADJ/NOPB operate with ceramic output capacitors only?
Yes, the LM22673MR-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors-no electrolytic or tantalum capacitors are required. This is enabled by its internal Type III compensation and voltage-mode control architecture, which maintains phase margin across typical ceramic capacitor ESR ranges.
LM22673MR-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM22673MR-ADJ/NOPB FAQ
1.How can I place an order for LM22673MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673MR-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 LM22673MR-ADJ/NOPB reliable?
The price and inventory of LM22673MR-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 LM22673MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673MR-ADJ/NOPB?
LM22673MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673MR-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 LM22673MR-ADJ/NOPB?
For technical support, including LM22673MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673MR-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 LM22673MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673MR-ADJ/NOPB?
All LM22673MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673MR-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 LM22673MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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