LM3671MF-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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Introduction to LM3671MF-1.25/NOPBThe LM3671MF-1.25/NOPB is an integrated DC-to-DC switching regulator from Texas Instruments. It is a monolithic, synchronous PWM buck converter that is capable of operating in either a continuous conduction or discontinuous conduction (DCM) mode of operation and capable of providing up to 3 A of output current.Application Field of LM3671MF-1.25/NOPBThe LM3671MF-1.25/NOPB is ideal for low output voltage and current applications in mobile devices. Due to its ultra-lightweight, low-cost profile and its wide operating voltage range of up to 25 V, it is well suited for a variety of applications such as battery powered handheld equipment, portable tools, automotive applications and communication equipment. Its space efficient and high-density module size make it an attractive option for board layout design.Voltage Regulation Characteristics of LM3671MF-1.25/NOPBThe LM3671MF-1.25/NOPB\'s voltage regulation characteristics are impressive, boasting a 60 mV output voltage ripple (with a 0.1 μF capacitance) over the entire load range. Furthermore, the LM3671MF-1.25/NOPB\'s wide 2.8 V to 26 V input voltage range offers certain degree of protection against input voltage transients.Power Limiting and Protection Features of LM3671MF-1.25/NOPBIn addition to its impressive voltage regulation characteristics, the LM3671MF-1.25/NOPB also offers other useful features. It has a power limiting circuit that cuts off power to the output if the input current exceeds the maximum limit. Moreover, it also has other protection features such as over-voltage protection and under-voltage protection.Working Principle of LM3671MF-1.25/NOPBThe LM3671MF-1.25/NOPB integrates a configurable switch-mode regulator that is able to be operated in a continuous conduction or discontinuous conduction mode. In continuous conduction mode, the switch-mode regulator is like a classical switching regulator wherein the switching MOSFETs are used to modulate the average input voltage to achieve the desired regulated output voltage. In discontinuous conduction mode, however, the LM3671MF-1.25/NOPB is able to modulate the output voltage more efficiently than a classical switching voltage regulator.In continuous conduction mode, the MOSFETs are operated in switch-mode, switching on and off based on the input cycles. When the MOSFET is turned on, inductor current builds up and charges the output capacitance. When the MOSFET is turned off, the output capacitance takes over and discharges through the impedance of the load, reducing the output voltage. This process is repeated multiple times, consequently regulating the output voltage.In discontinuous conduction mode, the MOSFET is put in a situation wherein it will turn off and turn on faster, resulting in higher ripple. The current then flows and charges the output capacitance until the voltage builds up to a certain level, at which point the MOSFET is turned off and the output capacitance starts discharging. At the same time, the current begins to decrease until zero is reached, at which point the MOSFET is turned on to start the cycle again. The result is a higher switching frequency, higher power efficiency and better thermal performance.ConclusionThe LM3671MF-1.25/NOPB is an ideal solution for applications requiring high power efficiency and high power density. It is suitable for a wide range of applications and offers efficient power conversion and superior voltage regulation. The LM3671MF-1.25/NOPB has protection features such as over-voltage protection and under-voltage protection and is also capable of operating in either continuous conduction or discontinuous conduction mode.

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