LM2671N-5.0

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LM2671
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	260kHz
Current - Output:	500mA
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	6.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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Introduction
The LM2671N-5.0 is a DC/DC switching regulator or DC-to-DC converter module, sometimes called a “buck regulator”, commonly used to convert a higher voltage source to a lower, fixed voltage. It is part of the narrower category of ‘PMIC’ (power management integrated circuits), which are designed to save energy by optimising the flow of power through a dedicated IC. The LM2671N-5.0 is specifically designed to efficiently convert and regulate input voltages from 5V to 24V down to a fixed 5V output with a current capability of up to 1A.

Application fields
The LM2671N-5.0 is used in many applications and electronics systems, where it is necessary to convert and control the voltage of a power source. Typical applications of the LM2671N-5.0 include; powering digital instrumentation, such as a microcontroller and its peripheral modules, powering analog and digital communications systems, controlling the supply voltage for consumer electronics, and providing power to automotive electronic systems. It is widely used on consumer electronic appliances and equipment, including: computers, printers, gaming systems, audio and television equipment, air conditioning systems, automotive devices and communications systems, as well as industrial and medical applications.

Functionality and features
The LM2671N-5.0 features a 0.6V Dropout voltage capability and a ‘power good’ auto-restart function, which provides an indication of the power supply status. The module is designed for minimal EMI noise, with excellent transient response performance and low output ripple voltage. The device integrates a high-performance switchmode controller, p-channel current-mode synchronous buck device, boost diode and logic functions, which are all designed to provide very low power consumption and minimal power dissipation. It can be used with an external MOSFET to optimise the output voltage, while keeping its power consumption to a minimum. It also offers protection against overvoltage, short-circuit and undervoltage conditions, as well as inrush current limiting. Other features include external synchronization to reduce noise and an adjustable output current limit function to simplify power protection.

Working principle
The LM2671N-5.0 operates according to the switched-mode power supply (SMPS) principle, which is a highly efficient form of regulation that converts voltage from a power source to a predetermined level. This allows it to provide an output voltage that is regulated and independent of the input voltage. It works within a switching frequency range between 250KHz and 2MHz, varying the width of pulses and the amount of power that is delivered to its output depending on the state of the output set point. In other words, the LM2671N-5.0 alters its switching rate, or ‘pulse frequency modulation (PFM)’, to ensure that the output remains stable, even when the input voltage is fluctuating. As a result, the device is able to convert a higher DC voltage from one circuit to a lower DC voltage in another, without any loss to power.

Conclusion
The LM2671N-5.0 DC/DC switching regulator is a well-designed and easy to use power management IC that can provide safe, cost-effective and precise regulation of input voltages. It offers a wide input and output voltage range, precise control and efficient power conversion, making it ideal for a variety of commercial and personal applications. With its low dropout voltage, low power consumption, good noise immunity and intuitive protection features, the LM2671N-5.0 is capable of regulating voltage of up to 24V to a fixed 5V output with minimal power dissipation and at a reliable current of up to 1A.

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