LM3671MFX-1.875

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.875/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, housed in a SOT-23-5 surface-mount package. It features a fixed 1.875 V output capable of delivering up to 600 mA of load current. The device operates with an input voltage range of 2.7 V to 5.5 V and utilizes a typical switching frequency of 2.6 MHz. Key electrical parameters include a maximum line regulation of 0.031 %/V and load regulation of 0.0013 %/mA. 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 Pulse Width Modulation (PWM) for low noise and Pulse Frequency Modulation (PFM) for high efficiency at light loads.
• Internal synchronous rectification ensures high energy conversion efficiency during PWM mode operation.
• Integrated protection mechanisms including internal soft-start, current overload protection, and thermal shutdown.
• Ultra-low quiescent current consumption in PFM mode and minimal battery drain in shutdown mode.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable mobile phones and similar handheld communication devices
• Personal digital assistants (PDAs) and掌上电脑 systems
• MP3 players and portable audio equipment
• Digital cameras and imaging devices
• Automotive electronic subsystems requiring AEC-Q100 qualified components

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix designation, such as NOPB, to confirm RoHS compliance and lead-free status prior to ordering. Ensure the selected variant matches the required fixed output voltage or adjustable configuration. Confirm that the SOT-23-5 package dimensions align with the target PCB footprint constraints. Cross-reference the manufacturer's latest datasheet for any potential design changes or pinout updates before finalizing the bill of materials.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing power supplies for single-cell lithium-ion battery applications requiring a compact solution. The high switching frequency allows for the use of small external inductors and ceramic capacitors, minimizing overall board space. Consider the automatic mode transition feature if the application demands both high efficiency under light loads and low output ripple under heavy loads. Verify that the required output current does not exceed the 600 mA limit for reliable long-term operation.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3671 family of step-down DC-DC converters designed specifically for portable electronics. The family offers various fixed voltage outputs and adjustable versions to suit different logic levels. The LM3671 series is characterized by its ability to operate efficiently across a wide input voltage range while maintaining a small form factor, making it suitable for space-constrained consumer and automotive products.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-1.875/NOPB serves as a direct pin-compatible alternative within the same product family.

Voltage Regulators - DC DC Switching Regulators FAQ

How does the LM3671MFX-1.875 manage efficiency at light loads?

The device automatically switches from Pulse Width Modulation (PWM) to Pulse Frequency Modulation (PFM) mode when the load current decreases. This hysteretic PFM operation significantly reduces the quiescent current to approximately 16 µA, thereby extending battery life in portable applications.

What is the typical shutdown current consumption?

In shutdown mode, the device disconnects the battery path, reducing the battery current consumption to a typical value of 0.01 µA, which minimizes power drain when the system is powered off.