SPX3940AT-L-1-8/TR

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Linear voltage regulators are some of the most important components in the electrical systems. SPX3940AT-L-1-8/TR is an extensive, configurable linear voltage regulator with a wide range of applications. This article details the application field, working principle and other salient features of the SPX3940AT-L-1-8/TR.

Description

The SPX3940AT-L-1-8/TR is part of the large family of linear voltage regulators offered by Semtech, a renowned provider of power management solutions. It is a low dropout (LDO) design featuring a maximum input voltage of 20V and a maximum output voltage of 1.5V. It is capable of delivering up to 400mA output current at 75°C ambient temperature. The maximum quiescent current of the device is 20mA, making it highly suitable for low power applications.

The SPX3940AT-L-1-8/TR is constructed using a SOT25L-8 metal package, making it highly compact, light weight and thermally efficient. The device offers excellent transient performance, with a guaranteed minimum line/load response of 10μs. It also features overcurrent, overtemperature and overvoltage protection.

Application Field

The SPX3940AT-L-1-8/TR linear voltage regulator is ideal for applications requiring low voltage, low power and high efficiency. Its low power operation ensures low power consumption in portable devices, making it suitable for use in a range of portable and handheld devices such as smartphones, tablets and GPS systems. The device can also be used in other applications such as automotive, instrumentation, medical and industrial control systems.

The compact design, versatile output voltage range and current rating make the SPX3940AT-L-1-8/TR an ideal choice for a variety of applications. For example, it can be used in automotive systems to convert the input voltage of battery systems to lower and more stable outputs. It can also be used as a battery charger in mobile systems, to maintain the required output voltage level.

Working Principle

The SPX3940AT-L-1-8/TR is a Type-II linear voltage regulator. This type of regulator works on the principle of controlling the output voltage by changing the resistance in the feedback loop in response to the input voltage. The circuit comprises an Operational Amplifier (OPA) connected to an N-Channel MOSFET. The OPA acts as a comparator, comparing the output voltage to an external reference voltage and adjusts the resistance accordingly. This increases or decreases the current to the MOSFET, which in turn regulates the output voltage.

The SPX3940AT-L-1-8/TR is a low dropout regulator, meaning that it can accept higher input voltages than traditional linear regulators. This is due to the lower resistance of the MOSFET, which reduces the amount of power lost in the form of heat.

Conclusion

The SPX3940AT-L-1-8/TR is a versatile, configurable linear voltage regulator with a wide range of applications. It can be used in battery charging, automotive systems and industrial control systems, among others. Its low dropout characteristic and low power consumption make it ideal for use in handheld and portable devices. Additionally, its highly compact size, light weight and excellent transient response make it one of the most efficient voltage regulators available.

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