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Texas Instruments LM22672QMRX-ADJ/NOPB
- Part No.:
- LM22672QMRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22672QMRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM22672QMRX-ADJ/NOPB from Texas Instruments is a 42-V, 1-A adjustable-output synchronous buck DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200-mΩ N-channel MOSFET switch, supports input voltages from 4.5 V to 42 V, delivers output as low as 1.285 V via external feedback divider, and operates at a default 500 kHz switching frequency with ±1.5% reference accuracy. It is used in industrial power rails converting 24 V or 12 V inputs to sub-5 V logic supplies.
For engineers reviewing the LM22672QMRX-ADJ/NOPB datasheet, LM22672QMRX-ADJ/NOPB pinout, LM22672QMRX-ADJ/NOPB application, or LM22672QMRX-ADJ/NOPB equivalent, key selection criteria include its wide VIN range, internal voltage-mode compensation, adjustable soft-start, RT/SYNC frequency control, and automotive-grade thermal rating (–40°C to +125°C junction).
Technical Context
The LM22672QMRX-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward for stable loop gain across input variations. Its internal Type III compensation is optimized for outputs ≤5 V, and it uses a bootstrap gate driver with integrated diode for high-side N-FET drive.
It features precision enable with 1.6 V threshold and 0.6 V hysteresis, programmable soft-start via SS pin current (50 µA typ), and three RT/SYNC modes: internal 500 kHz oscillator, resistor-adjustable (200–1000 kHz), or external synchronization (up to 1 MHz). Current limit foldback disables under severe overload when sync mode is active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24 V industrial buses and 12 V automotive systems without pre-regulation. |
| Output Voltage Range | 1.285 V to 42 V - adjustable via external resistor divider; minimum set by internal 1.285 V reference. |
| Switch RDS(on) | 200 mΩ (typ) - enables ≥90% efficiency at 1 A load with minimal conduction loss. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - balances EMI, component size, and transient response. |
| Feedback Reference Accuracy | ±1.5% (–40°C to +125°C) - ensures tight output regulation across full automotive temperature range. |
| Quiescent Current | 3.4 mA (typ), 6 mA (max) - enables low-power operation in always-on subsystems. |
| Standby Current | 25 µA (typ) - allows ultra-low power shutdown for battery-backed applications. |
| Junction Temperature Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and industrial environments. |
Pinout & Package
LM22672QMRX-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 enhanced thermal dissipation (RθJA = 60°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Connects to SW and external 10 nF ceramic capacitor; supplies gate drive voltage for internal high-side N-FET. |
| EN | Enable control input | Logic-level input with 1.6 V threshold and 0.6 V hysteresis; enables precise power sequencing and external UVLO implementation. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize ringing and EMI. |
| RT/SYNC | Oscillator mode control | Selects between internal 500 kHz clock, resistor-programmed frequency (200–1000 kHz), or external synchronization (≤1 MHz). |
| FB | Feedback input | High-impedance (230 nA bias) input referenced to 1.285 V; sets output voltage via external resistor divider. |
| GND | Power and signal ground | Common return path for power stage and control circuitry; must be connected to exposed thermal pad. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal LDO, gate driver, and control logic; requires local 10 µF ceramic input capacitor. |
| SS | Soft-start timing input | Sinks 50 µA current; external capacitor (100 nF–1 µF) sets ramp time to prevent inrush current and overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design for 1.285–5 V outputs with stable loop response. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics or tantalums. |
| Integrated bootstrap diode | Removes need for external bootstrap diode; reduces BOM count and layout area while maintaining gate drive integrity. |
| Adjustable soft-start | Prevents input inrush and output overshoot via user-selectable ramp time (500 µs base, extendable with external capacitor). |
| Precision enable with UVLO support | Allows robust power sequencing and system-level undervoltage protection using simple resistor dividers from upstream rails. |
| Thermal shutdown & current limiting | Protects against sustained overloads and PCB overheating; latches off at 150°C junction temperature. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
Use Scenario: Powering isolated digital I/O circuits in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator generating 3.3 V or 5 V for microcontrollers, level shifters, and optocoupler drivers. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions on factory floor wiring; –40°C to +125°C rating ensures reliability in uncontrolled enclosures. | Use Scenario: Supplying 3.3 V to CAN transceivers and microcontrollers in vehicle body electronics modules. IC Role / Device Role / Timing Role: Secondary DC/DC converter deriving regulated rail from 12 V battery, supporting cold-crank (down to 4.5 V) and load-dump (up to 42 V) events. Use Value: AEC-Q100 Grade 1 qualification and internal current limiting provide functional safety compliance for non-safety-critical but mission-relevant subsystems. |
| Telecom Remote Radio Unit | Embedded Medical Sensor Hub |
Use Scenario: Generating 1.8 V or 2.5 V for FPGAs and ADCs in outdoor wireless base station remote radio heads. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator placed near FPGA core, minimizing IR drop and noise coupling. Use Value: 500 kHz fixed frequency enables predictable EMI filtering; internal compensation avoids tuning delays during board bring-up. | Use Scenario: Providing clean, low-noise 3.3 V power to analog front-end sensors and low-power ARM Cortex-M microcontrollers in portable diagnostic devices. IC Role / Device Role / Timing Role: Main system regulator powering mixed-signal SoC and precision analog circuitry. Use Value: ±1.5% reference accuracy and <6 mA quiescent current ensure accurate sensor readings and extended battery life in battery-operated units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674QMRX-ADJ/NOPB | Same pinout, 3-A output capability, higher RDS(on) (120 mΩ), wider frequency range (100–1000 kHz). | Supports higher load currents; requires larger inductor and output capacitor; better suited for 2–3 A applications. | Select when >1 A load current or lower dropout at high VIN is required; verify thermal margin with 3-A capability. |
| TPS54260DGQR | 3.5–60 V input, 2.6-A output, current-mode control, no internal compensation, requires external RC network. | Higher input voltage ceiling and output current; demands more design effort for loop stability and EMI mitigation. | Choose for >42 V input or when current-mode control's fast transient response is critical; accept added design complexity. |
Compared with LM22672QMRX-ADJ/NOPB, LM22674QMRX-ADJ/NOPB offers higher current capacity in identical footprint, while TPS54260DGQR extends input range and output current at the cost of requiring external compensation and increased layout sensitivity.
Availability
LM22672QMRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom infrastructure requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for LM22672QMRX-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 expertise in high-reliability DC/DC conversion.
The LM22672 product line delivers SIMPLE SWITCHER® buck regulators targeting cost-sensitive, space-constrained applications needing wide-input, automotive-grade, easy-to-use power solutions - especially where minimal external components and WEBENCH® design integration are priorities.
FAQ
What is the minimum output voltage achievable with LM22672QMRX-ADJ/NOPB?
The LM22672QMRX-ADJ/NOPB has an internal 1.285 V feedback reference voltage, which sets the lowest possible output voltage when the FB pin is directly connected to the output. With proper resistor divider selection and layout, the device reliably regulates down to 1.285 V ±1.5% across –40°C to +125°C. Output voltages below this require external reference circuitry not supported by the LM22672QMRX-ADJ/NOPB architecture.
Does LM22672QMRX-ADJ/NOPB require an external bootstrap diode?
No, LM22672QMRX-ADJ/NOPB integrates a bootstrap diode internally. The BOOT pin connects directly to the SW node and an external 10 nF ceramic capacitor - no external diode is needed. This reduces bill-of-materials count and PCB area while maintaining reliable high-side gate drive for the internal 200-mΩ N-channel MOSFET switch.
Can LM22672QMRX-ADJ/NOPB synchronize to an external clock?
Yes, LM22672QMRX-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 external clock on the rising edge. Synchronization is established at startup and resumes automatically if the external clock is temporarily lost. Note that current limit foldback is disabled when sync mode is active.
What thermal performance can be expected from LM22672QMRX-ADJ/NOPB in HSOP-8 PowerPAD package?
With proper PCB layout - including soldering the exposed thermal pad to ≥1 in² of inner-layer ground copper - LM22672QMRX-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 60°C/W. At 1 A load and 12 V input, typical power dissipation is ~0.3 W, resulting in ~18°C junction-to-ambient rise above ambient. Derating is required above 85°C ambient to maintain ≤125°C max junction temperature.
Is LM22672QMRX-ADJ/NOPB pin-compatible with the fixed-output LM22672QMRX-5.0/NOPB?
Yes, LM22672QMRX-ADJ/NOPB and LM22672QMRX-5.0/NOPB share identical HSOP-8 PowerPAD packaging, pinout, and electrical interface. The only functional difference is the feedback configuration: the -ADJ version uses external resistors to set output voltage, while the -5.0 version has internal 5 V reference and FB pin internally connected to output. No PCB redesign is needed when swapping between them.
LM22672QMRX-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22672QMRX-ADJ/NOPB FAQ
1.How can I place an order for LM22672QMRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22672QMRX-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 LM22672QMRX-ADJ/NOPB reliable?
The price and inventory of LM22672QMRX-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 LM22672QMRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22672QMRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22672QMRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22672QMRX-ADJ/NOPB?
LM22672QMRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22672QMRX-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 LM22672QMRX-ADJ/NOPB?
For technical support, including LM22672QMRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22672QMRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22672QMRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22672QMRX-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 LM22672QMRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22672QMRX-ADJ/NOPB?
All LM22672QMRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22672QMRX-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 LM22672QMRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22672QMRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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