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Texas Instruments LM22673QMR-ADJ/NOPB
- Part No.:
- LM22673QMR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673QMR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
LM22673QMR-ADJ/NOPB from Texas Instruments is a 42 V, 3 A adjustable-output synchronous buck DC/DC regulator in HSOP-8 PowerPAD package, featuring internal 120 mΩ N-channel MOSFET, 500 kHz fixed switching frequency, and ±1.5% feedback reference accuracy. It delivers stable 1.285 V to >42 V output in industrial power rails, telecom intermediate buses, and automotive subsystems.
For engineers reviewing the LM22673QMR-ADJ/NOPB datasheet, LM22673QMR-ADJ/NOPB pinout, LM22673QMR-ADJ/NOPB application, or LM22673QMR-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 ≤5 V outputs.
Technical Context
The LM22673QMR-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 integrates a high-side N-channel MOSFET switch (120 mΩ typical RDS(ON)), bootstrap gate driver with dedicated BOOT/SW pins, and programmable peak current limit via resistor-connected IADJ pin. Soft-start is controlled by external capacitor on SS pin, with internal 500 µs default ramp time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12 V, 24 V, and 48 V industrial/automotive rails without pre-regulation |
| Output Voltage Range | 1.285 V to >42 V - set via external FB divider; minimum regulated output equals internal 1.285 V reference |
| Switching Frequency | 500 kHz - enables compact magnetics and low output ripple; fixed, not synchronizable |
| Max Output Current | 3 A - continuous load capability with proper thermal management on HSOP-8 PowerPAD PCB pad |
| Feedback Accuracy | ±1.5% - ensures tight output regulation over –40°C to +125°C junction temperature range |
| RDS(ON) | 120 mΩ (typ) - reduces conduction loss at full load; specified at TJ = 25°C |
| Current Limit Range | 3.35 A to 5.5 A - adjustable via IADJ pin resistor; default 4.2 A when pin left floating |
Pinout & Package
LM22673QMR-ADJ/NOPB uses HSOP-8 PowerPAD (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 2) | Power Input | Primary supply input (4.5–42 V); connects to bulk input capacitor and must be decoupled locally |
| SW (Pin 1) | Switch Node | Drain of internal N-MOSFET; connects to inductor and external Schottky diode anode |
| BOOT (Pin 3) | Bootstrap Supply | Connects to 10 nF ceramic capacitor between BOOT and SW to drive high-side MOSFET gate |
| FB (Pin 6) | Feedback Input | High-impedance (230 nA bias) node for resistive divider; sets output voltage via VREF = 1.285 V |
| GND (Pin 4) | Signal Ground | Analog and power ground reference; tied to exposed pad and system ground plane |
| IADJ (Pin 5) | Current Limit Adjust | Resistor-to-ground sets peak switch current limit; open = 4.2 A default; 0.8 V internal reference |
| SS (Pin 7) | Soft-Start Control | Capacitor-to-ground extends startup ramp; internal 50 µA current source charges external CSS |
| EP (Exposed Pad) | Thermal & Ground | Must be soldered to large PCB copper area connected to GND for thermal performance (RθJA = 60°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Voltage Mode Control | Eliminates external compensation network; optimized for ≤5 V outputs with ceramic output capacitors |
| Adjustable Peak Current Limit | Programmable from 3.35 A to 5.5 A using single resistor on IADJ pin-enables component downsizing |
| Integrated Bootstrap Diode | Reduces external component count; eliminates need for discrete bootstrap diode in high-side gate drive path |
| UVLO with Hysteresis | Turn-on at 4.3 V (typ), turn-off at 3.9 V (typ)-prevents erratic operation during brownout conditions |
| Thermal Shutdown Protection | Shuts down at 150°C junction temperature; auto-restarts after cooling to ~135°C-prevents permanent damage |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in PLC I/O modules operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V input to 3.3 V or 5 V logic supply with high efficiency and robust line regulation. Use Value: Delivers 3 A continuous current with <1.5% output error across –40°C to +85°C ambient, enabling reliable operation in factory-floor environments. | Use Scenario: Supplying infotainment head-unit subsystems (MCU, display backlight drivers) from vehicle battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: High-input-voltage buck converter providing isolated 5 V rail for USB host controllers and audio codecs. Use Value: Withstands 42 V transients per ISO 7637-2; integrated thermal shutdown prevents failure during under-hood thermal stress. |
| Telecom Intermediate Bus Converters | Embedded Computing Power Supplies |
Use Scenario: Converting 48 V backplane voltage to 12 V intermediate bus in datacom line cards requiring high density and low EMI. IC Role / Device Role / Timing Role: Fixed-frequency (500 kHz) buck regulator enabling small inductors and low-profile ceramic capacitors. Use Value: Achieves >90% efficiency at 3 A load; minimum off-time ensures boot capacitor recharge even at high duty cycles. | Use Scenario: Generating 1.8 V core voltage for ARM-based edge AI processors in compact gateway devices powered from 12 V wall adapter. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with precise 1.285 V reference enabling accurate low-voltage generation. Use Value: ±1.5% feedback accuracy maintains processor stability; soft-start prevents inrush current into large output capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674QMR-ADJ/NOPB | Same pinout, 3 A rating, but 100 mΩ RDS(ON) (SO PowerPAD), higher thermal performance (RθJA = 22°C/W) | Better suited for high-ambient-temperature environments where junction temperature margin is critical | Select when thermal headroom is constrained and PCB layout allows SO PowerPAD footprint |
| TPS54340DDAR | 42 V, 3.5 A, 500 kHz, but requires external compensation and lacks IADJ current limit adjustment | Offers higher current and wider VIN range but increases design complexity and BOM count | Choose when needing >3 A or when external loop tuning is acceptable for custom transient response |
Compared with LM22674QMR-ADJ/NOPB, the LM22673QMR-ADJ/NOPB trades lower thermal resistance for smaller HSOP-8 footprint; versus TPS54340DDAR, it provides simpler implementation via internal compensation and programmable current limit at the cost of fixed 500 kHz frequency.
Availability
LM22673QMR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and automotive subsystems requiring stable component supply with AEC-Q100 Grade 1 qualification support.
Supply support for LM22673QMR-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 ICs with decades of DC/DC regulator innovation.
The LM22673 product line delivers SIMPLE SWITCHER® buck regulators targeting high-voltage industrial, automotive, and telecom applications where reliability, ease of use, and minimal external components are critical.
FAQ
What is the minimum output voltage achievable with LM22673QMR-ADJ/NOPB?
The LM22673QMR-ADJ/NOPB achieves a minimum regulated output voltage of 1.285 V, equal to its internal feedback reference voltage. This value is specified at ±1.5% accuracy over –40°C to +125°C junction temperature. Lower voltages cannot be stably regulated because the error amplifier requires the FB pin to reach this reference threshold to maintain control loop stability.
How does the IADJ pin adjust current limit on LM22673QMR-ADJ/NOPB?
The IADJ pin on LM22673QMR-ADJ/NOPB sets peak switch current limit by sinking a constant 0.8 V reference current through an external resistor to GND. A resistor value of 0 Ω yields ~5.5 A limit; 100 kΩ yields ~3.35 A. The LM22673QMR-ADJ/NOPB samples IADJ voltage at startup (~100 µs after VIN applied) and holds that setting until next power cycle.
Can LM22673QMR-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22673QMR-ADJ/NOPB is explicitly designed for stability with low-ESR ceramic output capacitors. Its internally compensated voltage-mode architecture eliminates the need for electrolytic or tantalum capacitors. TI's datasheet confirms stability with ≥10 µF X5R/X7R ceramics and specifies minimum capacitance values per output voltage in the Applications section.
What is the purpose of the BOOT pin on LM22673QMR-ADJ/NOPB?
The BOOT pin on LM22673QMR-ADJ/NOPB supplies gate drive voltage to the internal high-side N-channel MOSFET. It connects to a 10 nF ceramic capacitor between BOOT and SW nodes, which is charged during the low-side conduction phase. This bootstrap circuit enables efficient high-side switching without requiring a separate floating supply, reducing system complexity.
Does LM22673QMR-ADJ/NOPB include thermal protection?
Yes, LM22673QMR-ADJ/NOPB incorporates internal thermal shutdown that activates at approximately 150°C junction temperature. When triggered, the device halts switching and enters hiccup mode until junction temperature falls below ~135°C, then automatically resumes operation. This protects the IC and surrounding components from permanent damage during sustained overload or poor heatsinking conditions.
LM22673QMR-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22673QMR-ADJ/NOPB FAQ
1.How can I place an order for LM22673QMR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673QMR-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 LM22673QMR-ADJ/NOPB reliable?
The price and inventory of LM22673QMR-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 LM22673QMR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673QMR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673QMR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673QMR-ADJ/NOPB?
LM22673QMR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673QMR-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 LM22673QMR-ADJ/NOPB?
For technical support, including LM22673QMR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673QMR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673QMR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673QMR-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 LM22673QMR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673QMR-ADJ/NOPB?
All LM22673QMR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673QMR-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 LM22673QMR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673QMR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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