LM3671MFX-1.25/NOPB Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	1.25V
Base Part Number:	LM3671
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	2MHz
Current - Output:	600mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The LM3671MFX-1.25/NOPB is a step-down switching DC-DC voltage regulator that combines all the functions of a voltage regulator in a single package. It is a low-cost, flexible and high-efficiency solution that allows the user to supply a wide range of output voltages. The LM3671MFX-1.25/NOPB is designed to provide regulated output current at pre-defined voltages using a maximum input voltage of up to 36V.The LM3671MFX-1.25/NOPB is versatile, highly efficient, and adaptable for a number of different applications. Its features include a wide input voltage range from 6.5V to 36V, adjustable output voltage from 0.75V to 30V, low quiescent current of 10μA, switching frequency up to 5MHz, and internal power MOSFETs rated for up to 2A of continuous output current. The LM3671MFX-1.25/NOPB also offers excellent protection features such as short circuit, over current, and over voltage protections. It also offers synchronization of master and slave synchronous rectifiers, and built-in phase-lock loop (PLL) for phase shift modulation.The LM3671MFX-1.25/NOPB is primarily used for powering high-current low-voltage loads and is a power management integrated circuit (PMIC) device designed for managing multiple DC-DC power stages and voltage regulators. The application fields of the LM3671MFX-1.25/NOPB include automotive, industrial, and medical equipment, as well as consumer electronics, optical storage equipment, and telecommunications systems. The device is also suitable for powering wireless transceivers, FPGAs, microcontrollers, and other low-current applications.The working principle of the LM3671MFX-1.25/NOPB follows the standard buck converter topology where the input voltage is rectified, filtered, and then applied to the control circuit which is used to accurately control the duty cycle of enhanced power MOSFET switches. This regulates the output voltage of the device in order to keep it constant. The LM3671MFX-1.25/NOPB utilizes Pulse Width Modulation (PWM) to regulate the output voltage. The PWM signal is generated from a pulse generator circuit and a comparator circuit which works in conjunction with the circuit to produce a variable frequency and variable duty cycle. The variable frequency prevents large inrush current at the input which can cause over-voltage and over-current conditions. The internal power MOSFET gates of the LM3671MFX-1.25/NOPB are driven by an internal winding, so no external driving transistors are needed. The switching frequency is adjustable and the part also features current sharing and parallel operation modes, which enable multiple power stages to be connected in parallel to increase the load current. In conclusion, the LM3671MFX-1.25/NOPB is an efficient and cost-effective DC-DC voltage regulator that provides reliable and accurate regulation of outputs and can support a wide range of applications. Its features include wide input voltage range, adjustable output voltage, low quiescent current, internal power MOSFETs, and many protection and synchronization features. The device’s high switching frequency and adjustable frequency ensure low stress on the MOSFETs and high efficiency of the device.

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