LM3670MFX-1.2

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MFX-1.2 is a miniature step-down DC-DC converter designed for ultra-low voltage circuits, manufactured by National Semiconductor (now Texas Instruments). It operates with an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 1.2 V. The device features automatic PFM/PWM mode switching to optimize efficiency across varying load conditions. It utilizes voltage-mode control with pulse width modulation technology. The component is housed in a 5-pin SOT-23 package and supports operation up to 85 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automatic transition between Pulse Frequency Modulation and Pulse Width Modulation modes for enhanced efficiency
• Compact SOT-23-5 packaging suitable for space-constrained designs
• Voltage-mode control architecture for stable regulation

Voltage Regulators - DC DC Switching Regulators Applications

• Ultra-low voltage circuit power management
• Portable electronic devices requiring compact regulators
• Battery-powered systems needing efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific suffix matches the required output voltage and package type. Confirm RoHS compliance status through official documentation, as older batches may differ. Cross-reference the datasheet revision date to ensure compatibility with current design specifications and pinout definitions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.2 V output is required from a single-cell battery or low-voltage source. The automatic mode switching makes it suitable for applications with variable load currents where efficiency is critical. Consider the thermal performance within the small SOT-23 package under maximum load conditions. Verify that the input voltage remains within the specified 2.5 V to 5.5 V range during all operating phases.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3670 family of miniature step-down converters. It shares functional similarities with other members like the LM3674 but differs in switching frequency and specific electrical characteristics. The LM3670 series is specifically engineered for ultra-low voltage applications, distinguishing it from higher-power buck converters in the broader portfolio.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MF-1.2/NOPB: Confirmed equivalent variant with updated manufacturing standards.