AS13985F28-T

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The AS13985F28-T is a Linear Voltage Regulator from the Power Management IC (PMIC) range manufactured by Allegro Microsystems. This specific device is an adjustable low dropout voltage regulator designed to provide up to 1.5A of output current at low voltage. This device is suitable for a variety of applications such as low-noise power supply regulation, high precision DC/DC converters, automotive auxiliary power supplies and battery-powered systems.

This linear voltage regulator features an adjustable output voltage range from 1.25V to 6.75V and is capable of providing up to 1.5A of output current. The device uses a low-noise PWM-controlled, current-mode architecture which ensures low noise performance and improved line and load transient response. The built-in power good and enable pin help with fault protection and allows easy device configuration. Additionally, the AS13985F28-T features soft start, current limit, thermal protection and over temperature protection which help protect the device from excessive stresses.

The AS13985F28-T is ideal for applications that require a low noise voltage regulator with a high level of space and cost efficiency. This device supports operation at up to 6.75V and provides a maximum of up to 1.5A of output current. The device is versatile in many applications due to its adjustable output voltage range and built-in protection features.

The working principle of the AS13985F28-T is pretty straightforward. To regulate the output voltage of the system, the device uses an error amplifier which compares the reference voltage applied to the Voltage Set pin with the voltage present across the feedback resistor. This amplifier uses Positive-Feedback to amplify the error between these two inputs and drives the power switch. The power switch changes its on/off status depending on the output current across it. When the output voltage is high, the error amplifier turns off the power switch and when the output voltage is low, the error amplifier turns on the power switch. This process continues until the output voltage is regulated as required.

In conclusion, the AS13985F28-T is a low dropout voltage regulator from the Power Management IC range which is suitable for a wide range of applications. This device is designed for a wide adjustable output range from 1.25V - 6.75V and provides up to 1.5A of output current. Additionally, the device features an error amplifier and a power switch to regulate the output voltage. This allows the system to have a low noise voltage regulation and an improved line and load transient response. The device also features a range of internal protection features which help protect the device from excessive stresses. This allows for greater flexibility and cost savings in many applications.

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