LM22671QMRX-5.0/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM22671QMRX-5.0/NOPB is a fixed-output buck converter from the Texas Instruments SIMPLE SWITCHER family, designed for high-efficiency step-down applications. It integrates a 0.42-ohm N-channel power switch and delivers a regulated 5V output at up to 500mA. The device operates with an input voltage range of 4.5V to 42V and supports switching frequencies up to 500kHz. Key electrical parameters include a typical quiescent current of 3.4mA and a maximum duty cycle of 90%. It features thermal shutdown and overcurrent protection, operating reliably within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 0.42-ohm N-channel power switch enables compact external component selection
• Fixed 5.0V output eliminates external feedback resistor requirements
• Frequency synchronization capability allows multiple converters to operate in phase
• Built-in thermal shutdown and adjustable current limit protect against fault conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control systems with wide input voltage ranges
• Automotive electronics meeting AEC-Q100 qualification standards

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the 'Q' suffix indicates automotive-grade qualification (AEC-Q100) rather than standard commercial grade. Confirm the 'X' suffix denotes tape-and-reel packaging versus tube. Ensure the manufacturer part number matches exactly, as minor suffix variations affect temperature rating and package type. Cross-reference the datasheet revision date to ensure compatibility with latest design guidelines.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5V output is required without external resistors. It is suitable for designs needing input voltages up to 42V with moderate load currents around 500mA. Consider the SO-PowerPAD-8 package for thermal performance. Compare against adjustable variants if flexible output voltage is needed later in the design process.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2267x series of SIMPLE SWITCHER regulators, which share common internal architecture but differ in current capacity and output configuration. The LM22671 specifically targets 500mA applications, distinguishing it from higher-current siblings like the LM22673 or LM22677. The Q prefix aligns it with automotive reliability standards within this product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM22671MR-5.0/NOPB: Commercial grade equivalent with identical electrical specifications but different temperature qualification.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum input voltage for this regulator?

The LM22671QMRX-5.0/NOPB supports a maximum input voltage of 42V.

Does this device support frequency synchronization?

Yes, the SYNC pin allows the switching frequency to be synchronized to an external clock signal.

What is the typical quiescent current consumption?

The typical quiescent current is 3.4mA during normal operation.