LM2676SX-ADJ/NOPB

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Introduction

The LM2676SX-ADJ/NOPB is a monolithic integrated circuit specifically designed for switching mode regulating applications. It provides an adjustable output voltage with an internal switch to allow user control of the regulator. The adjustable output voltage is set by an onboard variable resistor. This switching mode regulator is well-suited for a wide range of applications, such as computing, telecommunications, and control systems.

Features

The LM2676SX-ADJ/NOPB is designed for low-cost applications and provides strong performance in terms of power dissipation, frequency peaks, and power efficiency. Some of its major features include: -Gain accuracy: It has a high precision (+/- 1%) that provides high accuracy near switching lines.-Current protection: It has a built-in current protection circuit that protects the device from short circuits, over-load, and over-voltage.-High efficiency: It provides high efficiency up to 97%, and this efficiency is maintained over the entire load range of 0.5A to 3A.-Stable operation: Its low output ripple and its low noise operation ensure a stable output voltage.-Wide input voltage: The LM2676SX-ADJ/NOPB can be operated with input voltage of 4V to 72V.

Applications

The LM2676SX-ADJ/NOPB is well suited for applications in the computing, telecommunications, and control systems. It is suitable for use in:-Personal Computers: the switching regulator is commonly used in laptop and personal computer applications.-Battery operated systems: It can be used to efficiently provide power to systems running on batteries.-Power supplies: This switching mode regulator is also suitable for use in various power supply applications.-Telecommunications: it can be used in telecom systems to provide reliable and cost-effective power management solutions.

Working Principle

The LM2676SX-ADJ/NOPB utilises a synchronous rectification architecture with N-channel MOSFETs to achieve a high efficiency. The chip operates in two modes: Burst Mode (BM) and Pulse Frequency Modulation (PFM). Switching frequency is adjustable between 150 kHz and 1 MHz.In Burst Mode (BM) operation, when the output voltage drops below the regulation threshold, the IC starts to switch the lower MOSFET at a fixed frequency and duty cycle. When it reaches its maximum duty cycle, the IC automatically switches to PFM operation to keep the output voltage below the under-voltage threshold. This mode maximises efficiency by providing the lowest output voltage with minimal switching losses.In Pulse Frequency Modulation (PFM) operation, the control circuitry monitors the output voltage and adjusts the MOSFET switching frequency accordingly. When the output voltage drops, the switching frequency is increased to maintain the regulation threshold. Similarly, when the output voltage rises, the switching frequency is lowered to remain within the regulation threshold.

Conclusion

The LM2676SX-ADJ/NOPB is a great choice for adjustable output voltage applications in computing, telecommunications, and control systems. This switching regulator offers strong performance with high efficiency and accurate regulation. Its built-in current protection circuit provides additional safety for the device, and its wide input voltage range makes it suitable for a variety of applications.

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