AAT3244ITP-AA-T1

Voltage Dropout (Max):	0.3V @ 300mA, 0.3V @ 300mA
Supplier Device Package:	12-TSOPJW
Package / Case:	12-TFSOJ (0.094", 2.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Temperature
Control Features:	Enable
PSRR:	--
Current - Quiescent (Iq):	160µA
Current - Output:	300mA, 300mA
Series:	--
Voltage - Output (Max):	3.6V
Voltage - Output (Min/Fixed):	0.6V
Voltage - Input (Max):	5.5V
Number of Regulators:	2
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The AAT3244ITP-AA-T1 is a low noise, low dropout linear regulator which offers both adjustable and fixed output voltages. It is based on a CMOS-compatible Linear Regulator Core (LRC), which employs a basic \'Charge Pump\' topology in order to allow operation down to very low output voltages. This device is capable of delivering tightly regulated output currents of up to 500mA and is offered in a 16-pin QFN package.

Application Field

The AAT3244ITP-AA-T1 is suitable for powering digital and RF applications, especially those require a low noise output voltage. Due to its low output voltage regulation and wide input voltage range, it is applicable to a wide variety of systems, ranging from mobile phones to personal computers. Furthermore, its low operation current and high input voltage range make it suitable for battery-powered applications, such as portable media players.

Working Principle

The AAT3244ITP-AA-T1 linear regulator operates on a simple three-stage principle, with power coming in at the input and maintaining output current by controlling the amount of current flowing through the output stage. The input stage is responsible for converting the input voltage to the required output voltage and current. The intermediate stage is controlled by a reference voltage and provides the voltage regulation, while the output stage provides the current regulation.The input stage of the AAT3244ITP-AA-T1 is comprised of a series of p-ch and n-ch field effect transistors (FETs). These FETs are employed in a parallel configuration, along with an output circuit, to create the power switch for the regulator. By applying a series of pulses to the FETs, the input voltage is converted to a lower voltage, which is then passed through the intermediate stage for voltage regulation.The intermediate stage of the AAT3244ITP-AA-T1 consists of a voltage reference circuit and an output control circuit. The voltage reference circuit controls the amount of output voltage by setting a reference voltage which is then compared with the output voltage. If the output voltage is lower than the reference voltage, the output current is reduced so that the output voltage is increased and vice versa. The output control circuit is also responsible for providing the current regulation. It senses the amount of current flowing in the output to maintain the required output voltage.The output stage of the AAT3244ITP-AA-T1 is responsible for providing the necessary current drive to the load. It is comprised of a series of parallel pass transistors which are configured to provide an output current as determined by the output control circuit.

Conclusion

The AAT3244ITP-AA-T1 is a highly versatile linear regulator which is suitable for lower voltage applications that require low noise and high efficiency. Its wide input voltage range and high output current make it suitable for a variety of applications including mobile phones, multimedia devices and typically battery powered products. Its working principle is based on the three-stage theory with the input, intermediate and output stages. It employs a series of p-ch and n-ch FETs to convert the input voltage to the required output voltage, while a voltage reference circuit and an output control circuit provide voltage and current regulation.

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