LM3671MFX-1.875/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.875/NOPB is a synchronous step-down DC-DC converter from Texas Instruments, designed for portable applications. It features a fixed 1.875V output with a maximum load current of 600mA. The device operates within an input voltage range of 2.7V to 5.5V and utilizes a typical switching frequency of 2.6MHz. It employs a Buck topology in a SOT-23-5 package. Key electrical parameters include a typical quiescent current of 16µA and a shutdown current of 0.01µA. The component supports an operating temperature range from -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent automatic switching between PWM low-noise mode and PFM low-current mode to optimize efficiency across varying load conditions.
• Internal synchronous rectification ensures high energy conversion efficiency during PWM operation.
• Integrated protection mechanisms including internal soft-start, overcurrent protection, and thermal shutdown.
• Requires only three external surface-mount components: one inductor and two ceramic capacitors.

Voltage Regulators - DC DC Switching Regulators Applications

• Mobile phones and similar portable systems
• Portable hard disk drives
• Personal digital assistants (PDAs)
• MP3 players
• Digital cameras

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix '1.875' to confirm the fixed 1.875V output voltage, as the LM3671 series offers multiple fixed voltage options. Ensure the 'MFX' designation matches the required SOT-23-5 tape-and-reel packaging format. Confirm that the standard industrial temperature range (-40°C to +85°C) meets the system requirements, distinguishing it from automotive-grade variants like the LM3671-Q1 which support higher temperatures.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.875V rail is required from a single-cell lithium-ion battery source. The 2.6MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 600mA current limit for loads exceeding this threshold. The SOT-23-5 package is suitable for space-constrained designs. Verify compatibility with the required output capacitor ESR specifications for stability.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of optimized buck converters from Texas Instruments. The family is characterized by its ability to power low-voltage circuits from single-battery inputs. Variants within the series differ primarily in fixed output voltages or qualification levels (e.g., automotive Q1). The LM3671MFX-1.875/NOPB represents the standard industrial grade with a specific fixed output setting.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-1.875/NOPB is the non-tape variant of the same device. LM3671MFX-ADJ/NOPB provides an adjustable output version within the same package. LM3671QTLX-1.8/NOPB is an automotive-grade alternative with different qualification but similar electrical characteristics.