LM25066APSQE/NOPB

Introduction

The LM25066APSQE/NOPB is a high-efficiency, high-current buck regulator with integrated MOSFETs from Texas Instrument. This specialized power management IC features a wide power range from 8V to 48V and allows to handle currents up to 1.5A. It is widely used in various applications, from automotive to consumer products.

Application Field

The LM25066APSQE/NOPB offers a wide input voltage range of 8V to 48V, and is suitable for applications that require a high power supply, such as automotive and consumer products. The IC also features low RDS(on)-rated MOSFETs, a wide output voltage range, low quiescent current, low output voltage ripple, and fast transient response. This makes it suitable for a wide range of power supplies, such as automotive and industrial power supplies, AV products, and telecom power systems.

Features

The LM25066APSQE/NOPB has several features that make it suitable for high-power applications. First, it features integrated low-RDS(on) MOSFETs, which reduce conduction losses and improve efficiency. Second, it offers a wide output voltage range of 8V to 48V. Third, its quiescent current is very low and does not increase with increase in input voltage. Fourth, its output voltage ripple is also low. Fifth, it has fast transient response time, which makes it suitable for several high-power applications.

Working Principle

The LM25066APSQE/NOPB utilizes a simple buck regulator topology. The IC contains an internal oscillator that drives the switching frequency of the MOSFETs. The IC begins to operate in the bucking mode when the reference voltage on its FB pin is less than a certain threshold. In this mode, the internal MOSFETs switch at the predetermined frequency. When the FB voltage exceeds the reference voltage, the IC switches to the bypass mode.

In the bucking mode, the voltage on the FB pin is brought in line with the reference voltage by way of an error amplifier, which senses the difference between the reference voltage and the FB voltage. The error amplifier then controls the buck output voltage by varying the on-time of the internal MOSFETs. The output voltage is thus proportional to the reference voltage.

In the bypass mode, the internal MOSFETs are turned off, and the input voltage is supplied directly to the output. This mode is used when the output voltage drops below the reference voltage, ensuring that the input voltage is supplied to the output. The internal MOSFETs are then turned on when the output voltage reaches the reference voltage.

Conclusion

The LM25066APSQE/NOPB is a specialized power management IC designed for applications that require a high-current, high-efficiency power supply. It offers a wide input voltage range of 8V to 48V, integrated low-RDS(on) MOSFETs, a wide output voltage range, low quiescent current, low output voltage ripple, and fast transient response time. All of these features make it suitable for a wide range of power supplies, from automotive and industrial, to AV and telecom power systems.