LM3671MFX-2.5

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-2.5/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, designed for portable applications. It operates with an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 2.5 V. The device delivers a maximum load current of 600 mA with a typical switching frequency of 2 MHz. It features automatic transition between PWM and PFM modes to optimize efficiency across varying load conditions. The component is housed in a compact SOT-23-5 package and supports an operating temperature range from -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent automatic switching between Pulse Width Modulation (PWM) low-noise mode and Pulse Frequency Modulation (PFM) low-current mode to enhance system control and extend battery life.
• Internal synchronous rectification ensures high energy efficiency during PWM operation while minimizing external component count.
• Integrated protection mechanisms include internal soft-start, current overload protection, and thermal shutdown to safeguard the device under fault conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Mobile phones and similar portable communication systems
• Portable hard disk drives requiring efficient power regulation
• Personal digital assistants (PDAs) and handheld computing devices

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number includes the /NOPB suffix to confirm lead-free compliance and specific manufacturing lot details. Confirm the fixed 2.5 V output requirement matches the design specifications, as other voltage variants exist within the LM3671 family. Ensure the SOT-23-5 package footprint aligns with the PCB layout constraints before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 2.5 V rail is required from a single-cell lithium-ion battery source. The 2 MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 600 mA current limit against peak load demands. The automatic mode switching makes it suitable for applications with variable duty cycles where standby power consumption is critical.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3671 series of step-down DC-DC converters optimized for portable electronics. The series offers various fixed output voltages and adjustable versions to support different logic families. The LM3671MFX variant specifically denotes the tape-and-reel packaging format, facilitating automated surface-mount assembly processes in high-volume manufacturing environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers include LM3671MF-2.5/NOPB, which shares identical electrical characteristics but differs in reel packaging configuration. Verify pinout compatibility and thermal performance requirements when transitioning between these specific package variants.