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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM22671QMRX-ADJ/NOPB

Name: LM22671QMRX-ADJ/NOPB
Brand: Texas Instruments
SKU: LM22671QMRX-ADJ/NOPB
Price: 2.40 USD
Availability: InStock
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Part No.:: LM22671QMRX-ADJ/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-PowerSOIC (0.154", 3.90mm Width)

Datasheet:: LM22671QMRX-ADJ/NOPB.pdf

Description:: IC REG BUCK ADJ 500MA 8SOPWR

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Product details

Overview

LM22671QMRX-ADJ/NOPB from Texas Instruments is a 42 V, 500 mA adjustable-output synchronous buck DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET, supports 4.5–42 V input, delivers output as low as 1.285 V via external feedback divider, and operates at 500 kHz (adjustable 200 kHz–1 MHz) for industrial power conversion in 24 V rail systems.

For engineers reviewing the LM22671QMRX-ADJ/NOPB datasheet, LM22671QMRX-ADJ/NOPB pinout, LM22671QMRX-ADJ/NOPB application, or LM22671QMRX-ADJ/NOPB equivalent, key selection criteria include its internal voltage-mode compensation, ±1.5% reference accuracy over –40°C to +125°C, integrated bootstrap diode, precision enable with 1.6 V threshold and 0.6 V hysteresis, and automotive-grade thermal shutdown at 150°C.

Technical Context

The LM22671QMRX-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feed-forward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network is optimized for outputs ≤5 V and eliminates external compensation components.

It uses a floating high-side gate driver powered by a bootstrap capacitor between BOOT and SW pins, requiring ≥5 mA minimum load for reliable capacitor recharge during minimum off-time (100 ns). The RT/SYNC pin selects among three modes: internal 500 kHz oscillator, resistor-adjusted frequency (200 kHz–1 MHz), or external synchronization - but not simultaneously.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 42 V - supports direct regulation from unregulated 24 V, 12 V, or 5 V rails without pre-regulation.
Output Current	500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained industrial modules.
Feedback Reference	1.285 V ±1.5% - enables precise adjustable output down to 1.285 V using two external resistors; stable over full temperature range.
Switching Frequency	500 kHz default (200 kHz–1 MHz adjustable) - balances EMI performance, inductor size, and transient response in compact layouts.
MOSFET R_DS(on)	200 mΩ (typ) - reduces conduction loss and thermal stress at full load, enabling operation without forced air cooling.
Enable Threshold	1.6 V with 0.6 V hysteresis - allows clean power sequencing with simple resistor dividers from upstream supplies.
Quiescent Current	3.4 mA (typ) - maintains efficiency in always-on subsystems while enabling fast wake-up from standby mode.

Pinout & Package

LM22671QMRX-ADJ/NOPB is housed in an HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad connected to GND for enhanced heat dissipation in high-power-density applications.

Pin/Terminal	Circuit Role	Design Meaning
BOOT	Bootstrap supply input	Provides gate drive voltage for internal high-side MOSFET; requires 10 nF ceramic capacitor to SW for reliable switching.
EN	Enable control input	Logic-level precision enable with 1.6 V turn-on threshold and 0.6 V hysteresis; draws only 6 µA when pulled low.
SW	Switch node output	Drives external inductor; swings from ~0 V to VIN; must be routed with short, low-inductance traces to minimize EMI.
FB	Feedback input	Connects to resistor divider from VOUT; senses output voltage with 230 nA bias current for minimal divider error.
GND	Power and signal ground	Common return path for power stage and control circuitry; exposed pad must be soldered to PCB GND plane.
RT/SYNC	Oscillator mode control	Selects internal 500 kHz clock, resistor-tuned frequency (200 kHz–1 MHz), or external sync - latched at startup.
SS	Soft-start timing	Controls ramp rate of output voltage via external capacitor; resets on EN toggle or thermal shutdown.
VIN	Main power input	Accepts 4.5–42 V; internal UVLO prevents operation below 3.9 V (falling) to protect downstream circuitry.

Key Features

Feature	Design Value
Internally compensated voltage-mode control	Eliminates need for external compensation network; simplifies design and improves robustness across component tolerances.
Stable with low-ESR ceramic capacitors	Enables use of small, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics - reducing board area and improving lifetime.
Integrated bootstrap diode	Removes external diode requirement in bootstrap circuit, lowering BOM count and layout complexity for high-side gate drive.
Adjustable soft-start	Prevents inrush current and output overshoot via user-selectable start-up time (500 µs base, extendable with external capacitor).
Thermal shutdown & current limiting	Protects against sustained overload or ambient overheating; shuts down at 150°C junction temperature with automatic recovery.

Applications

Industrial Control	Telecom Power
Use Scenario: Regulating 24 V bus to 3.3 V for PLC I/O modules operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3 V to microcontroller, ADC, and digital isolators. Use Value: Internal compensation and –40°C to +125°C operation ensure consistent regulation without recalibration across temperature extremes.	Use Scenario: Point-of-load conversion in telecom line cards where EMI compliance and compact footprint are critical. IC Role / Device Role / Timing Role: Efficient 48 V-to-5 V conversion feeding FPGA core logic and SerDes interfaces. Use Value: Adjustable 200 kHz–1 MHz switching frequency enables EMI band avoidance and optimal inductor sizing for dense board layouts.
Automotive Body Electronics	Embedded Sensor Hub
Use Scenario: Powering CAN transceivers and LIN controllers in under-hood modules exposed to 12 V battery transients up to 42 V. IC Role / Device Role / Timing Role: Input-robust buck regulator meeting AEC-Q100 Grade 1 requirements for automotive body control units. Use Value: 42 V absolute max input rating and built-in UVLO prevent malfunction during cold-crank or load-dump events.	Use Scenario: Multi-rail power management in IoT edge nodes with MEMS sensors, BLE radio, and low-power MCU. IC Role / Device Role / Timing Role: Adjustable-output regulator generating 1.8 V for sensors and 3.3 V for wireless SoC from shared Li-ion or 5 V USB input. Use Value: Single 1.285 V reference enables precise dual-voltage generation with minimal external components and <1.5% output tolerance.

Industrial Control

Telecom Power

Use Scenario: Regulating 24 V bus to 3.3 V for PLC I/O modules operating in factory environments with wide ambient temperature swings.

IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3 V to microcontroller, ADC, and digital isolators.

Use Value: Internal compensation and –40°C to +125°C operation ensure consistent regulation without recalibration across temperature extremes.

Use Scenario: Point-of-load conversion in telecom line cards where EMI compliance and compact footprint are critical.

IC Role / Device Role / Timing Role: Efficient 48 V-to-5 V conversion feeding FPGA core logic and SerDes interfaces.

Use Value: Adjustable 200 kHz–1 MHz switching frequency enables EMI band avoidance and optimal inductor sizing for dense board layouts.

Automotive Body Electronics

Embedded Sensor Hub

Use Scenario: Powering CAN transceivers and LIN controllers in under-hood modules exposed to 12 V battery transients up to 42 V.

IC Role / Device Role / Timing Role: Input-robust buck regulator meeting AEC-Q100 Grade 1 requirements for automotive body control units.

Use Value: 42 V absolute max input rating and built-in UVLO prevent malfunction during cold-crank or load-dump events.

Use Scenario: Multi-rail power management in IoT edge nodes with MEMS sensors, BLE radio, and low-power MCU.

IC Role / Device Role / Timing Role: Adjustable-output regulator generating 1.8 V for sensors and 3.3 V for wireless SoC from shared Li-ion or 5 V USB input.

Use Value: Single 1.285 V reference enables precise dual-voltage generation with minimal external components and <1.5% output tolerance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable-output buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM22670QMRX-ADJ/NOPB	Lower 3 V min input, 40 V max input, 300 mA output; no RT/SYNC frequency adjust/sync capability.	Suitable for lower-voltage systems (e.g., 5 V input rails); lacks flexibility for EMI-sensitive or synchronized multi-rail designs.	Choose when input stays below 40 V and 500 mA output is unnecessary - reduces cost and thermal load.
TPS54302DDAR	3.5–28 V input, 3 A output, 2.5 V–28 V adjustable output; requires external compensation; no integrated bootstrap diode.	Better for higher-current loads; demands more design effort for stability and layout due to external compensation and discrete bootstrap.	Choose when >500 mA is required and board space allows larger inductor/capacitor and compensation network.

Compared with LM22670QMRX-ADJ/NOPB, LM22671QMRX-ADJ/NOPB offers higher input voltage tolerance and frequency flexibility; compared with TPS54302DDAR, it trades output current headroom for integration simplicity and thermal robustness in compact 500 mA applications.

Availability

LM22671QMRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and embedded sensor hub applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for LM22671QMRX-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 and embedded processing technologies, with decades of expertise in power management ICs.

The LM22671 product line delivers SIMPLE SWITCHER® buck regulators designed for ease-of-use in industrial, automotive, and telecom power systems - emphasizing integration, thermal resilience, and WEBENCH®-enabled design acceleration.

FAQ

What is the minimum output voltage achievable with LM22671QMRX-ADJ/NOPB?

The LM22671QMRX-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 the full –40°C to +125°C junction temperature range. To achieve this minimum, the FB pin must be connected directly to the output; any external resistor divider will raise the regulated output above 1.285 V. The LM22671QMRX-ADJ/NOPB datasheet confirms this limit applies specifically to the -ADJ variant and is not dependent on external component selection.

Does LM22671QMRX-ADJ/NOPB require an external bootstrap diode?

No, LM22671QMRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external diode in the BOOT-to-SW path. This reduces BOM count and layout complexity while maintaining reliable high-side gate drive. A 10 nF ceramic capacitor must still be placed between BOOT and SW with low-inductance routing. The LM22671QMRX-ADJ/NOPB datasheet explicitly states "Integrated Boot-Strap Diode" as a feature and confirms the internal implementation in the functional block diagram and pin description.

Can LM22671QMRX-ADJ/NOPB synchronize to an external clock?

Yes, LM22671QMRX-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external clock signal with amplitude meeting VSYNC specifications (1.75 V threshold, 1 MHz max) is applied during startup, the device latches into sync mode and locks to the rising edge of that clock. Synchronization is only active if the external frequency exceeds the internal 500 kHz oscillator and remains within 1 MHz. The LM22671QMRX-ADJ/NOPB datasheet details this behavior in Section 7.3.3 and warns that current limit foldback is disabled in sync mode.

What is the thermal resistance (R_θJA) of LM22671QMRX-ADJ/NOPB in its HSOP-8 PowerPAD package?

The junction-to-ambient thermal resistance (R_θJA) of LM22671QMRX-ADJ/NOPB in the HSOP-8 PowerPAD package is 60°C/W, as specified in the Thermal Information table of the official datasheet. This value assumes standard JEDEC 2-layer board conditions. Effective thermal performance depends on proper soldering of the exposed thermal pad to a large PCB GND copper area; inadequate pad connection will degrade actual R_θJA. The LM22671QMRX-ADJ/NOPB datasheet confirms this metric applies to both LM22671 and LM22671-Q1 variants in the DDA (HSOP-8) package.

Is LM22671QMRX-ADJ/NOPB qualified for automotive applications?

Yes, LM22671QMRX-ADJ/NOPB is the automotive-grade variant (LM22671-Q1 family) and is AEC-Q100 Grade 1 qualified for operation from –40°C to +125°C junction temperature. Its part number suffix "Q" and "/NOPB" denote automotive qualification and lead-free finish. The datasheet explicitly states "LM22671-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified", and the LM22671QMRX-ADJ/NOPB ordering information maps to the Q1 version in TI's official documentation.

LM22671QMRX-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:: 500mA

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

LM22671QMRX-ADJ/NOPB FAQ

1.How can I place an order for LM22671QMRX-ADJ/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM22671QMRX-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 LM22671QMRX-ADJ/NOPB reliable?

The price and inventory of LM22671QMRX-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 LM22671QMRX-ADJ/NOPB is usually 5 days.

3.What payment methods are accepted for LM22671QMRX-ADJ/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671QMRX-ADJ/NOPB transactions.

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4.How is shipping managed for LM22671QMRX-ADJ/NOPB?

LM22671QMRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM22671QMRX-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 LM22671QMRX-ADJ/NOPB?

For technical support, including LM22671QMRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671QMRX-ADJ/NOPB requirements.

6.How does Aetrix verify that LM22671QMRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?

All LM22671QMRX-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 LM22671QMRX-ADJ/NOPB meets industry standards.

7.What is the process for return or replacement of LM22671QMRX-ADJ/NOPB?

All LM22671QMRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671QMRX-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 LM22671QMRX-ADJ/NOPB part is unused and in its original packaging.

Return procedure for LM22671QMRX-ADJ/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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