MAX8891EXK31+T

The MAX8891EXK31+T is a low-dropout, low-noise, fixed output voltage linear regulator with a wide input voltage range, enabling the device to be used in a number of applications. It is classified as a PMIC (Power Management Integrated Circuit) under Voltage Regulators – Linear.

The MAX8891EXK31+T can operate from a single +2.2V to +20V supply, such as a battery, and provides a constant 3.1V output voltage. This linear regulator can supply up to 250mA of current, ensuring that a large number of electronic applications can be powered successfully.

This MAX8891EXK31+T linear regulator uses a classic three-terminal TO-238-EP package and is designed to offer high power conversion efficiency in a small package, making it ideal for use in portable applications operating in the harsh environment of automotive and industrial applications.

Applications

The MAX8891EXK31+T is an excellent solution for a number of applications, including:

• DC power control for automotive and industrial applications
• Battery-powered devices such as medical instruments and portable consumer electronics
• Data logging and storage systems
• System level DC/DC functions in consumer and industrial applications
• Governor circuits

Working Principle

The MAX8891EXK31+T is a linear regulator, meaning that the output voltage is determined by a voltage divider, or rather a series of resistor configurations. A linear regulator voltage is higher than its reference voltage due to the voltage drops of the transistors and resulting resistors. This regulates the output voltage by dissipating any excess power as heat.

The device is enabled by an external pull-up voltage (Venable) on the EN pin, whose built-in comparator determines when the output voltage needs to be regulated. When the enabled voltage is greater than the comparator input (~2.2V), the device is enabled, and when the enabled voltage is lower than the comparator input, the device is disabled.

The MAX8891EXK31+T steps down the input voltage and regulates the output voltage by controlling the voltage across the pass transistor. This type of linear regulator has improved efficiency when compared to traditional solutions at low output voltages. The low quiescent current of the MAX8891EXK31+T ensures that the device does not consume too much power when the device is not in use, thereby reducing the output voltage to save power.

Features

The MAX8891EXK31+T offers some high-performance features, including:

• Low-noise operation
• High power conversion efficiency
• Low dropout voltage
• Thermal compensation
• Low quiescent current

The MAX8891EXK31+T is a low-dropout, low-noise, fixed output voltage linear regulator, offering a wide input voltage range, and enabling it to be used in a variety of applications. Its small form factor, together with its simplicity and high power conversion efficiency, make it a great choice for portable and automotive applications.