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Texas Instruments LM22672MRX-ADJ/NOPB
- Part No.:
- LM22672MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22672MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:5,890
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Product details
Overview
LM22672MRX-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 LM22672MRX-ADJ/NOPB datasheet, LM22672MRX-ADJ/NOPB pinout, LM22672MRX-ADJ/NOPB application, or LM22672MRX-ADJ/NOPB equivalent, key selection criteria include its adjustable feedback reference (±1.5%), precision enable threshold (1.6 V typ), integrated bootstrap diode, thermal shutdown (150°C), and SO PowerPAD package for enhanced thermal performance.
Technical Context
The LM22672MRX-ADJ/NOPB implements a voltage-mode PWM controller 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 ceramic output capacitors and inductors suitable for ≤5 V outputs.
It features a precision enable input with 0.6 V hysteresis and 6 µA internal pullup, supporting controlled power sequencing and external UVLO implementation. The RT/SYNC pin selects among three modes-internal 500 kHz oscillator, resistor-adjusted frequency (200 kHz–1 MHz), or external synchronization-though frequency adjustment and sync cannot operate simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-range industrial rails including 12 V, 24 V, and 42 V battery 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 via external resistor divider. |
| Switching Frequency | 500 kHz default (200 kHz–1 MHz adjustable) - balances EMI, component size, and efficiency in space-constrained designs. |
| MOSFET RDS(ON) | 200 mΩ max - reduces conduction loss and improves thermal performance at full load. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including industrial control and automotive under-hood applications. |
| Quiescent Current | 25 µA in shutdown - minimizes standby power draw in always-on or battery-backed systems. |
Pinout & Package
LM22672MRX-ADJ/NOPB is housed in an HSOP-8 PowerPAD (MR) package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for low thermal resistance (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. |
| EN | Enable control input | Logic-level enable with 1.6 V typical threshold and 0.6 V hysteresis; supports power sequencing and external UVLO. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; must be routed with short, low-inductance traces. |
| FB | Feedback sensing input | Monitors output via resistor divider; internal 1.285 V reference sets regulated output voltage. |
| GND | Power and signal ground | Common return path; connects to exposed PowerPAD for thermal and electrical integrity. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz, resistor-adjusted, or external synchronized mode; latched at startup. |
| SS | Soft-start timing input | Controls ramp-up time via external capacitor; extends startup to reduce inrush current and stress. |
| VIN | Main power input | Accepts 4.5–42 V; supplies internal bias and high-side driver; requires local 10 µF ceramic input capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation components; simplifies design for 1.285–5 V outputs. |
| Stable with low-ESR ceramic capacitors | Enables use of small, reliable, high-frequency output capacitors without tantalum or electrolytic alternatives. |
| Integrated bootstrap diode | Removes need for external bootstrap diode; reduces BOM count and layout complexity. |
| Adjustable soft-start via SS pin | Prevents output overshoot and inrush current by controlling rise time with a single external capacitor. |
| Precision enable with UVLO support | Allows clean system power sequencing and configurable undervoltage lockout using resistor dividers. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces in factory automation cabinets with 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V to 3.3 V or 5 V for microcontroller, ADC, and communication ICs. Use Value: Wide 4.5–42 V input range accommodates bus fluctuations; 125°C junction rating ensures reliability in enclosed enclosures. | Use Scenario: Generating intermediate rails (e.g., 3.3 V, 1.8 V) from 48 V backplane in Ethernet switches and base station equipment. IC Role / Device Role / Timing Role: Point-of-load (POL) converter delivering regulated voltage to FPGA core and I/O banks. Use Value: 500 kHz switching enables compact magnetics; internal compensation accelerates design cycle vs discrete controllers. |
| Embedded Systems | Conversions from Standard Input Rails |
Use Scenario: Power management in ruggedized edge computing devices operating from 12 V vehicle or rail power. IC Role / Device Role / Timing Role: Main system regulator supplying processor, memory, and peripherals with tight load regulation. Use Value: ±1.5% feedback accuracy maintains stable logic levels; thermal shutdown protects against airflow-blocked deployments. | Use Scenario: Down-converting legacy 24 V, 12 V, or 5 V supply rails to modern low-voltage logic rails in retrofitted equipment. IC Role / Device Role / Timing Role: Efficient, drop-in replacement for linear regulators or older buck ICs requiring minimal board rework. Use Value: High efficiency (>90%) eliminates heat sinks; SO PowerPAD package fits existing footprints with improved thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-ADJ/NOPB | Lower 3 V min input, 42 V max input, 3 A output, same package - higher current capability but larger solution size due to higher peak currents. | Preferred where >1 A load current is required; less suitable for space-constrained 1 A designs due to increased inductor/capacitor sizing. | Select LM22670MRX-ADJ/NOPB only if sustained >1 A output is needed; LM22672MRX-ADJ/NOPB offers better fit for 1 A with smaller passive components. |
| TPS54202DRCT | 2.9–17 V input, 2 A output, 500 kHz fixed frequency, no RT/SYNC pin - lacks wide-input capability and frequency adjust/sync features. | Suitable for low-voltage DC systems (e.g., 12 V only); not viable for 24 V/42 V industrial inputs or EMI-sensitive synchronized systems. | Choose TPS54202DRCT only for cost-sensitive, low-input-voltage applications where 42 V operation and sync are unnecessary. |
Compared with LM22670MRX-ADJ/NOPB and TPS54202DRCT, LM22672MRX-ADJ/NOPB uniquely balances 42 V input tolerance, 1 A capability, adjustable frequency/sync, and compact HSOP-8 PowerPAD packaging - making it optimal for industrial and telecom POL designs requiring robustness and layout flexibility.
Availability
LM22672MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom/datacom systems, and embedded systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM22672MRX-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 LM22672 product line delivers SIMPLE SWITCHER® step-down regulators designed for ease of use, minimal external components, and rapid design-in - targeting industrial, automotive, and communications applications demanding wide-input, high-efficiency DC/DC conversion.
FAQ
What is the minimum output voltage supported by LM22672MRX-ADJ/NOPB?
The LM22672MRX-ADJ/NOPB supports a minimum output voltage of 1.285 V, set by its internal feedback reference voltage. This value is specified with ±1.5% accuracy over temperature (–40°C to +125°C). Output voltage is adjusted using an external resistor divider connected to the FB pin, and the device's internal compensation is optimized for outputs at or below 5 V.
Does LM22672MRX-ADJ/NOPB require an external bootstrap diode?
No, LM22672MRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. The BOOT pin connects directly to the SW node via a 10 nF ceramic capacitor. This integration reduces bill-of-materials count and simplifies PCB layout while maintaining reliable high-side gate drive for the internal 200 mΩ N-channel MOSFET.
Can LM22672MRX-ADJ/NOPB synchronize to an external clock?
Yes, LM22672MRX-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external clock signal (1.75 V threshold, rising-edge triggered, 50% duty cycle) between 500 kHz and 1 MHz is applied, the device synchronizes its switching frequency. Note that synchronization and resistor-based frequency adjustment cannot be used simultaneously - the mode is latched at startup based on RT/SYNC pin voltage.
What thermal performance can be expected from LM22672MRX-ADJ/NOPB in HSOP-8 PowerPAD package?
LM22672MRX-ADJ/NOPB in the HSOP-8 PowerPAD (MR) package achieves a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of PCB copper. The exposed thermal pad must be soldered to a solid GND plane for optimal heat dissipation. At 1 A load and 12 V input, typical junction temperature rise is ~30°C above ambient - well within the –40°C to +125°C operating range.
Is LM22672MRX-ADJ/NOPB suitable for automotive applications?
The LM22672MRX-ADJ/NOPB is not AEC-Q100 qualified. However, the pin-compatible LM22672-Q1 variant is automotive-grade (AEC-Q100 Grade 1, –40°C to +125°C) and shares identical electrical specifications and package. For automotive designs requiring qualification, LM22672-Q1 should be selected; LM22672MRX-ADJ/NOPB remains appropriate for industrial and telecom applications with equivalent temperature and reliability requirements.
LM22672MRX-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:
- 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
LM22672MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22672MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22672MRX-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 LM22672MRX-ADJ/NOPB reliable?
The price and inventory of LM22672MRX-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 LM22672MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22672MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22672MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22672MRX-ADJ/NOPB?
LM22672MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22672MRX-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 LM22672MRX-ADJ/NOPB?
For technical support, including LM22672MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22672MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22672MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22672MRX-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 LM22672MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22672MRX-ADJ/NOPB?
All LM22672MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22672MRX-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 LM22672MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22672MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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