LM3670MFX-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MFX-ADJ is a miniature synchronous step-down DC-DC converter manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It operates with an input voltage range of 2.5 V to 5.5 V and provides an adjustable output voltage from 700 mV to 3.3 V. The device delivers up to 350 mA of output current at a fixed switching frequency of 1 MHz. It features ultra-low quiescent current of 15 µA in shutdown mode and supports automatic PFM/PWM mode switching for enhanced efficiency across varying load conditions.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous buck topology enables high conversion efficiency in a compact SOT-23-5 package.
• Automatic transition between Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) modes optimizes performance under light and heavy loads.
• Ultra-low shutdown current minimizes power consumption when the system is inactive.
• Adjustable output voltage allows flexibility for various low-voltage circuit requirements.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable electronic devices requiring efficient power management
• Battery-powered systems needing extended operational life
• Low-power embedded circuits with variable voltage demands

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix matches the required configuration, as variations exist within the LM3670 family. Confirm manufacturer documentation aligns with Texas Instruments specifications, given the historical transition from National Semiconductor. Ensure component authenticity through authorized distribution channels to avoid counterfeit risks associated with legacy part numbers.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an adjustable output voltage is required within a 2.5 V to 5.5 V input range. It is suitable for applications prioritizing space savings due to its small footprint. Consider the 350 mA current limit and 1 MHz switching frequency against system noise and inductor size constraints compared to higher-current alternatives like the LM3671.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3670 series of miniature DC-DC converters. Originally introduced by National Semiconductor, production and support were transferred to Texas Instruments following their acquisition. The series focuses on providing high efficiency and small form factors for portable consumer electronics, distinguishing it from standard linear regulators or larger switching converters.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MFX-1.8/NOPB: Fixed 1.8 V output variant.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current capability of the LM3670MFX-ADJ?

The device supports a maximum output current of 350 mA.

How does the LM3670MFX-ADJ manage efficiency at light loads?

It automatically switches between PFM and PWM modes to maintain high efficiency across different load levels.