LM3670MF-1.2/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MF-1.2/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, housed in a compact SOT-23-5 package. It delivers a fixed 1.2 V output with a maximum current of 350 mA. The device operates from an input voltage range of 2.5 V to 5.5 V and supports a switching frequency of 1 MHz. It features automatic transition between Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) modes to optimize efficiency across varying load conditions. The component functions within an ambient temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification for high conversion efficiency in a minimal footprint.
• Automatically switches between PFM and PWM control modes based on load demand.
• Utilizes voltage-mode control architecture for stable regulation.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable battery-powered consumer electronics
• Embedded systems requiring efficient single-cell lithium-ion power management
• Industrial control modules with limited board space

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free compliance and RoHS status against the manufacturer's latest documentation. Confirm the package marking code matches the SOT-23-5 physical dimensions. Ensure the fixed 1.2 V output variant aligns with circuit requirements, as other voltage options exist within the LM3670 family. Cross-reference the datasheet revision date to ensure compatibility with current design standards.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed low-voltage rail is required from a single-cell source. The 350 mA output current limits suitability for high-power applications; consider higher-current variants like the LM3671 or LM3674 if loads exceed this threshold. The 1 MHz frequency allows for smaller external inductors compared to lower-frequency alternatives. Verify that the input voltage range covers the minimum cell discharge voltage and maximum charging voltage.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3670 series of mini SD DC-DC converters designed for space-constrained portable devices. It serves as a direct replacement for older linear regulators where efficiency and thermal performance are critical. The series shares architectural similarities with the LM3671 and LM3674 families but offers distinct current ratings and feature sets tailored for specific power budgets.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MF-1.2 is the non-RoHS equivalent. LM3671MF-1.2/NOPB offers higher current capacity (600 mA) with similar packaging. LM3674MF-1.2/NOPB provides 600 mA at a higher switching frequency (2 MHz). Verify pinout compatibility before substituting with these related parts.