LM3671MFX-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-ADJ/NOPB is a Texas Instruments step-down DC-DC converter in SOT-23-5 packaging. It features a Buck topology with an input voltage range of 2.7 V to 5.5 V and an adjustable output voltage from 1.1 V to 3.3 V. The device delivers up to 600 mA output current at a typical switching frequency of 2 MHz (range 1.6 MHz to 2.6 MHz). It operates within a temperature range of -40°C to +85°C, utilizing internal synchronous rectification for high efficiency.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automatically switches between PWM low-noise mode and PFM low-current mode to optimize system control and extend battery life.
• Integrates internal synchronous rectification to achieve high energy efficiency during PWM operation.
• Includes built-in soft start, overcurrent protection, and thermal shutdown protection mechanisms.

Voltage Regulators - DC DC Switching Regulators Applications

• Mobile phones and similar portable systems
• Portable hard drives and personal digital assistants
• MP3 players and digital cameras
• Automotive electronics requiring AEC-Q100 qualification

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm the exact part variant and pinout configuration. Ensure that the ordering information matches the required package type and functional specifications. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and compliance with RoHS standards before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing power supplies for single-cell lithium-ion batteries requiring compact solutions. The adjustable output allows flexibility for various low-voltage circuits. Consider the small footprint enabled by the 2 MHz switching frequency, which permits the use of minimal external components including one inductor and two ceramic capacitors.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3671 family of step-down DC-DC converters designed for portable applications. It offers both fixed and adjustable output versions to suit different design requirements. The series is optimized for efficiency and size, making it suitable for space-constrained electronic devices powered by single-cell batteries.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-ADJ/NOPB is listed as a parameter-equivalent substitute.

Voltage Regulators - DC DC Switching Regulators FAQ

How does the LM3671MFX-ADJ manage efficiency under light loads?

It utilizes a hysteresis PFM mode that reduces static current to 16 µA typical during light load and standby conditions, thereby extending battery life.

What is the quiescent current in shutdown mode?

The device shuts down the battery connection, reducing battery consumption to 0.01 µA typical in shutdown mode.