LM3671MFX-1.375

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Fixed
Number of Outputs:	1
Voltage - Input (Min):	2.7V
Voltage - Input (Max):	5.5V
Voltage - Output (Min/Fixed):	1.375V
Voltage - Output (Max):	--
Current - Output:	600mA
Frequency - Switching:	2MHz
Synchronous Rectifier:	Yes
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	SOT-23-5
Base Part Number:	LM3671

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Introduction to LM3671MFX-1.375

The LM3671MFX-1.375 is an adjustable single cell Li-Ion/Li-Polymer battery switch mode buck converter designed for space-limited systems. It offers a wide range of voltage regulation and efficiency. This PMIC is suitable for applications such as cellular phones, pager, and portable hand-held devices which require a constant voltage and low power consumption.

Application Field

The LM3671MFX-1.375 works best in space-limited systems, especially in portable electronic devices such as smartphones, tablets, notebooks, and wearables. It can also be used in portable medical devices, measuring equipment, and communications applications such as base stations and routers.

Features and Benefits

The LM3671MFX-1.375 provides users with a reliable and highly efficient buck converter. It has a wide input voltage range from 3.0V to highly regulated 5.5V and an output voltage range from 1.5V to 5.5V. It delivers up to 1.5A of output current with excellent load and line regulation characteristics. The LM3671MFX-1.375 also provides good temperature characteristics and maintains a stable load transient performance.

Working Principle

The LM3671MFX-1.375 is a DC-DC switch mode buck converter that uses pulse width modulation to generate a regulated output voltage. It contains a control block, current-sensing network, high-side power switches, and an oscillator. The control block takes the feedback from the output voltage and adjusts the duty cycle of the oscillator, which controls the on-time of the power switch.The current sensing circuit monitors the output current and adjusts the duty cycle of the power switch accordingly to ensure that the output voltage is accurately regulated regardless of the output load. The LM3671MFX-1.375 also provides several features such as undervoltage lockout and overvoltage protection, internal thermal shutdown, and frequency jittering to improve efficiency and reduce EMI.

Conclusion

The LM3671MFX-1.375 is an ideal switch mode buck converter for space-limited systems. It provides a highly efficient, adjustable output voltage with a wide range of input voltage and excellent load and line regulation characteristics. It is suitable for applications such as cellular phones, pager, and portable hand-held devices which require a constant voltage and low power consumption.

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