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Texas Instruments LM22672MR-ADJ/NOPB
- Part No.:
- LM22672MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22672MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
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Product details
Overview
LM22672MR-ADJ/NOPB from Texas Instruments is a 42-V, 1-A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring voltage-mode control, internal compensation, and adjustable output down to 1.285 V. It integrates a 200 mΩ N-channel MOSFET switch, supports 4.5–42 V input, delivers >90% efficiency, and operates at 500 kHz (adjustable 200 kHz–1 MHz) for compact power designs in industrial and telecom systems.
For engineers reviewing the LM22672MR-ADJ/NOPB datasheet, LM22672MR-ADJ/NOPB pinout, LM22672MR-ADJ/NOPB application, or LM22672MR-ADJ/NOPB equivalent, key selection considerations include its ±1.5% feedback reference accuracy, precision enable threshold (1.6 V typ), integrated bootstrap diode, soft-start programmability via external capacitor, and thermal shutdown protection at 150°C.
Technical Context
The LM22672MR-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 is optimized for outputs ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features a precision enable input with 0.6 V hysteresis and 6 µA internal pullup, configurable UVLO via external resistor divider, and RT/SYNC pin supporting three modes: internal 500 kHz oscillator, resistor-adjusted frequency (200 kHz–1 MHz), or external synchronization (up to 1 MHz). Current limit foldback disables during sync mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive supply rails including 12 V, 24 V, and 48 V nominal systems. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, FPGAs, and analog circuitry in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise regulation of 3.3 V, 2.5 V, or custom voltages using external resistors. |
| Switch RDS(on) | 200 mΩ (typ) - reduces conduction loss and improves efficiency at full load, especially critical in high-current buck stages. |
| Switching Frequency | 500 kHz default, adjustable 200 kHz–1 MHz - balances EMI, component size, and transient response; higher frequencies allow smaller inductors/capacitors. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including industrial controls and telecom infrastructure. |
| Quiescent Current | 3.4 mA (typ) - enables low-power standby operation; drops to 25 µA in shutdown for battery-sensitive applications. |
Pinout & Package
LM22672MR-ADJ/NOPB uses the HSOP-8 PowerPAD (MR) package: 4.89 mm × 3.90 mm body with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 60°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Provides gate drive voltage for internal high-side MOSFET; requires 10 nF ceramic capacitor between BOOT and SW for reliable switching. |
| EN | Enable control input | Logic-level enable with 1.6 V threshold and 0.6 V hysteresis; supports precise power sequencing and external UVLO implementation. |
| SW | Switch node output | Drives external inductor; swings from GND to VIN; requires careful layout to minimize EMI and ringing. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz clock, resistor-adjusted frequency (25 kΩ–200 kΩ), or external synchronization (rising-edge triggered, up to 1 MHz). |
| FB | Feedback input | Monitors output via resistor divider; internal 1.285 V reference enables adjustable VOUT; bias current <230 nA minimizes divider error. |
| GND | Power and signal ground | Common return path for power stage and control circuitry; must be connected to exposed thermal pad for thermal and electrical integrity. |
| VIN | Main power input | Accepts 4.5–42 V; supplies internal LDO, gate driver, and control logic; requires local 10 µF ceramic input capacitor. |
| SS | Soft-start timing input | Controls startup ramp time via external capacitor (100 nF–1 µF); prevents inrush current and output overshoot during power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design and ensures stability with standard ceramic output capacitors. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode; reduces BOM count and PCB area while maintaining reliable high-side gate drive. |
| Adjustable soft-start | Programmable startup time (≈500 µs base, extendable with external capacitor) prevents output overshoot and limits inrush current into bulk capacitance. |
| Precision enable with UVLO support | Enables robust power sequencing and system-level undervoltage protection using simple resistor dividers-no external supervisor IC needed. |
| Thermal shutdown & current limiting | Protects against sustained overloads and PCB overheating; current foldback activates under severe short-circuit conditions to limit power dissipation. |
Applications
| Industrial Control | Telecom Power |
|---|---|
|
Use Scenario: Powering PLC I/O modules and sensor interfaces from unregulated 24 V rail. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V or 5 V to microcontroller and analog front-end. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions common in factory floor environments. |
Use Scenario: Point-of-load conversion in 48 V telecom line cards supplying FPGA core and I/O voltages. IC Role / Device Role / Timing Role: Efficient 48 V-to-1.2 V/3.3 V step-down stage with tight regulation and fast transient response. Use Value: 500 kHz switching and internal compensation enable compact, high-density power delivery meeting ETSI emission limits. |
| Embedded Systems | Automotive Body Electronics |
|
Use Scenario: Power management in edge AI gateways requiring multiple regulated rails from 12 V battery input. IC Role / Device Role / Timing Role: Adjustable-output buck converter generating 1.8 V for memory and 3.3 V for peripherals. Use Value: ±1.5% reference accuracy and –40°C to +125°C operation ensure consistent performance across ambient temperature extremes. |
Use Scenario: Powering infotainment display controllers and CAN transceivers in 12 V vehicle systems. IC Role / Device Role / Timing Role: Robust DC/DC regulator handling cold-crank (4.5 V) and load-dump (42 V) transients per ISO 16750-2. Use Value: Built-in thermal shutdown and current limiting protect against fault conditions in sealed, thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MR-ADJ/NOPB | Lower 3 V minimum input voltage; 300 kHz fixed frequency; same 1 A rating and HSOP-8 package. | Better suited for low-input applications (e.g., 5 V bus), but lacks frequency adjust/sync capability and has reduced VIN max (36 V vs 42 V). | Choose when input stays ≥3 V and 42 V tolerance is unnecessary; lower cost alternative with identical footprint. |
| TPS54340DDAR | 42 V input, 3.5 A output; adjustable frequency (100 kHz–2.5 MHz); no integrated bootstrap diode; SOIC-8 package. | Higher current capacity and wider frequency range, but requires external bootstrap diode and larger PCB area due to SOIC-8 thermal limitations. | Choose when >1 A load or finer frequency tuning is required; verify thermal performance with 3.5 A load on SOIC-8. |
Compared with LM22672MR-ADJ/NOPB, LM22670MR-ADJ/NOPB trades 42 V tolerance and frequency flexibility for lower VIN capability, while TPS54340DDAR offers higher current and broader frequency control at the cost of added external components and thermal derating in SOIC-8.
Availability
LM22672MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compatible performance margins.
Supply support for LM22672MR-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 decades of expertise in high-reliability power conversion ICs.
The LM22672MR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for ease of use in non-isolated DC/DC buck applications where minimal external components, internal compensation, and WEBENCH® design integration are critical.
FAQ
What is the minimum output voltage achievable with LM22672MR-ADJ/NOPB?
The LM22672MR-ADJ/NOPB has an internal feedback reference voltage of 1.285 V (±1.5%), which sets the lowest possible output voltage when using the ADJ configuration. With proper resistor divider selection and layout, the LM22672MR-ADJ/NOPB reliably regulates down to exactly this reference value-no external components are needed to reach 1.285 V, and it cannot be set lower due to the fixed internal reference.
Does LM22672MR-ADJ/NOPB require an external bootstrap diode?
No, the LM22672MR-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external diode between VIN and BOOT. This simplifies the bill of materials and PCB layout. A 10 nF ceramic capacitor must still be placed directly between BOOT and SW pins with short, low-inductance traces to ensure reliable high-side gate drive operation.
Can LM22672MR-ADJ/NOPB synchronize to an external clock?
Yes, the LM22672MR-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean square wave (≥1.75 V threshold, ≤1 MHz), the device locks to the rising edge of the external clock. Synchronization is latched at startup and reverts to 500 kHz if the external clock is lost during operation.
What thermal performance can be expected from LM22672MR-ADJ/NOPB in HSOP-8 PowerPAD package?
In the HSOP-8 PowerPAD (MR) package, LM22672MR-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of 2-oz copper. Actual thermal performance depends on PCB copper area and airflow; the exposed pad must be soldered to a solid GND plane to realize this rating and prevent thermal shutdown under 1 A continuous load.
How does the enable function work on LM22672MR-ADJ/NOPB?
The LM22672MR-ADJ/NOPB enable pin (EN) has a 1.6 V typical turn-on threshold with 0.6 V hysteresis and a 6 µA internal pullup. Driving EN above 2.2 V enables regulation; pulling below 1.3 V disables it, reducing quiescent current to 25 µA. The EN pin also supports external UVLO using a resistor divider from VIN, allowing programmable input voltage turn-on/off points.
LM22672MR-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:
- 1A
- 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
LM22672MR-ADJ/NOPB FAQ
1.How can I place an order for LM22672MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22672MR-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 LM22672MR-ADJ/NOPB reliable?
The price and inventory of LM22672MR-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 LM22672MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22672MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22672MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22672MR-ADJ/NOPB?
LM22672MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22672MR-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 LM22672MR-ADJ/NOPB?
For technical support, including LM22672MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22672MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22672MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22672MR-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 LM22672MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22672MR-ADJ/NOPB?
All LM22672MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22672MR-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 LM22672MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22672MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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