MAX8940EXK28+T

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The MAX8940EXK28+T is part of Maxim Integrated’s family of high-performance, low-dropout, voltage regulators. This device is designed to provide a regulated output voltage of 5V or 3.3V with a low ground current requirement. It is ideal for many applications, such as microprocessor and system shutdown, battery monitors, and portables.

Description

The MAX8940EXK28+T is an ultra-low voltage, high-precision CMOS linear voltage regulator. This device includes a voltage reference, an error amplifier, a p-channel MOSFET to pass the output current, and an output transistor. The internal circuitry is designed to keep the output voltage regulated during input voltage variations, over-currents and shutdown modes. In addition, the device includes an enable pin which can be used to enable or disable the output. The enable pin is also used for external output voltage control.

Application Field and Working Principle

The MAX8940EXK28+T is designed for use in mobile and portable electronic devices, particularly those powered by battery-based DC power sources. It is used to provide a regulated output voltage of 5V or 3.3V to an electronic system. The device works by taking the source voltage and passing it to the internal error amplifier which will compare the source voltage to an internal reference voltage. The error amplifier will then adjust the output voltage to match the reference voltage. The output voltage is then adjusted by the enable pin through the MOSFET to maintain the desired output voltage.

Features and Benefits

The MAX8940EXK28+T is specifically designed for portable applications and offers several advantages over other linear voltage regulators. These advantages include:

• Low ground current and low noise.
• Low quiescent current (in shutdown mode) ideal for battery-powered applications.
• High accuracy and low drift.
• Output voltage can be externally set.
• Over-current and thermal protection.

Conclusion

The MAX8940EXK28+T is a high-performance, low-dropout, voltage regulator that is designed to provide a regulated output voltage of 5V or 3.3V with a low ground current requirement, making it ideal for mobile and portable applications such as battery monitors and system shutdowns. The device includes a voltage reference, an error amplifier, a p-channel MOSFET, and an output transistor for controlling the output voltage. Furthermore, this device provides low noise and low quiescent current, as well as high accuracy and low drift. By taking advantage of these features, the MAX8940EXK28+T is able to meet the needs of many portable electronics applications.

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