LM2671M-3.3/NOPB

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Introduction to LM2671M-3.3/NOPB

The LM2671M-3.3/NOPB is a 3.3 volt, synchronous step-down Voltage Regulator IC used for DC/DC voltage conversion and power supply applications. It is a monolithic integrated circuit (IC) that is part of the LM26XX family of high-efficiency, step-down (buck) regulators. It is available in an 8-soic package, has a wide input voltage range, and provides a fixed output voltage of 3.3V. It has a programmable frequency capability and operates at a switching frequency of up to 500 kHz. The device includes an internal N-channel power MOSFET, current sense amplifier, and voltage sensing function. It is capable of operating in a step-down (buck) or step-up (boost) mode and provides high efficiency over a wide input voltage range. It can also be used for battery-backup applications, as it supports operating from very low input voltage sources of as low as 1.7V or 2.0V.

Application Field of LM2671M-3.3/NOPB

The LM2671M-3.3/NOPB is designed for use in a wide variety of applications, including charging systems, power management, portable devices, and other applications where precise regulation is required. It is suitable for both low and high current applications, as it offers fast transient response and high efficiency over wide input and load conditions. It can be used as a current limit and overtemperature protection device, and it is particularly useful in charger and battery-backup systems, owing to its wide input voltage range and low-dropout operation.

The LM2671M-3.3/NOPB is also ideal for a number of other applications, including battery-management systems, radio-frequency and communication devices, automotive applications, and power-over-Ethernet (PoE) systems. It can be used in polarity-reversal applications and serves as a power supply for digital power systems, such as data center, telecom and server applications.

Working Principle of LM2671M-3.3/NOPB

The LM2671M-3.3/NOPB works on the principle of voltage regulation and is designed to provide a regulated output voltage from an unregulated input voltage. It uses an internal N-channel power MOSFET, voltage sensing and current sensing amplifier, and a direct-voltage correction loop to provide stable output regulation with high efficiency, even at low input and load voltages. The device can be configured to provide fixed output voltage, or it can be programmed to accommodate changing input and load conditions with a single external capacitor. The device is capable of operating at a switching frequency of up to 500 kHz, which allows it to maintain high efficiency over a wide range of load and input conditions. Its internal protection features provide protection against overcurrent, overtemperature, and ESD damage.

The LM2671M-3.3/NOPB uses two different synchronous rectifier (SR) circuits, depending on the input voltage and output power. When the input voltage is within a certain range and close to the output voltage, it utilizes a single SR circuit. At lower input voltages, a dual SR circuit is used to increase efficiency. These two SR circuits help the device maintain high efficiency over a wide range of input and output conditions.

The LM2671M-3.3/NOPB also features programmable features such as soft-start, output voltage tracking, and frequency synchronization. These features allow the device to be tailored to specific applications, ensuring reliable and efficient operation.

Conclusion

The LM2671M-3.3/NOPB is a high-efficiency, DC/DC synchronous step-down Voltage Regulator IC with a wide input voltage range. It is designed to deliver a fixed output voltage of 3.3V and can be used in a variety of applications, including charging systems, power management, portable devices, and other applications where precise regulation is required. It features an internal N-channel power MOSFET, current sense amplifier, and voltage sensing function, as well as programmable features such as soft-start, output voltage tracking, and frequency synchronization. The device is capable of operating at a switching frequency of up to 500 kHz, helping it to maintain high efficiency over a wide range of load and input conditions. It is also suitable for battery-backup applications, as it supports operating from very low input voltage sources of as low as 1.7V or 2.0V.

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