LM3670MF-1.8

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MF-1.8 is a synchronous step-down DC-DC converter manufactured by National Semiconductor, now part of Texas Instruments. It operates with an input voltage range from 2.5V to 5.5V and delivers up to 600mA of output current. The device features a fixed switching frequency of 2MHz, enabling the use of small external components. It provides a fixed output voltage of 1.8V and includes automatic PFM/PWM mode switching for enhanced efficiency across varying load conditions. The component is housed in a compact SOT-23-5 package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous buck topology ensures high conversion efficiency during operation.
• Automatic transition between Pulse Frequency Modulation and Pulse Width Modulation modes optimizes performance under light and heavy loads.
• Compact SOT-23-5 package design facilitates space-constrained portable electronic applications.

Voltage Regulators - DC DC Switching Regulators Applications

• Wireless mobile phones
• Digital cameras
• MP3 players
• Personal digital assistants

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific suffix matches the required output voltage and package variant. Confirm RoHS compliance status and lead-free availability if required for your assembly process. Cross-reference the datasheet revision to ensure compatibility with your system design requirements.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing portable systems requiring efficient power management from single-cell lithium-ion batteries. The 2MHz switching frequency allows for smaller passive components compared to lower-frequency converters. Consider the fixed 1.8V output constraint; if adjustable voltage or different current ratings are needed, evaluate other variants within the LM367x family.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM3670 belongs to the LM367x series of miniaturized DC-DC converters introduced by National Semiconductor. This series focuses on extending battery life in portable devices through high efficiency and small form factors. The LM3670 specifically offers a fixed 1.8V output, distinguishing it from adjustable versions or those with different fixed voltages like the LM3671.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers include LM3670MF-1.2 and LM3670MF-1.8 variants within the same series. Check for LM3671 equivalents if voltage levels differ. Verify pinout and thermal characteristics before substitution.