A4490EES-T

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	A4490
Supplier Device Package:	20-QFN (4x4)
Package / Case:	20-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	550kHz
Current - Output:	--
Voltage - Output (Max):	30.6V
Series:	--
Voltage - Input (Max):	34V
Voltage - Input (Min):	4.5V
Number of Outputs:	3
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The A4490EES-T is a low power integrated circuit developed by Allegro MicroSystems, which provides a simple and cost-effective solution to current and voltage regulation needs. It is a general purpose buck/boost switching regulator designed to operate with an input voltage of 3 to 40 volts and output voltages as low as 1.5 volts. The regulator is specifically designed to provide a regulated output voltage despite imperfect output loading conditions and wide input voltage variations. The A4490EES-T\'s high power density, small package size, and low quiescent current make it ideal for a variety of applications, including portable devices, automotive power systems, industrial power systems, and renewable energy systems.

Application Field

The A4490EES-T\'s wide input and output voltage ranges, high power density, and low profile make it an excellent choice for many applications. In portable electronic devices, it is an ideal choice for portable battery-powered equipment because of its low quiescent current, which helps preserve battery life. In automotive applications, its wide voltage range and efficient operating temperature range make it ideal for onboard current and voltage regulation needs. In industrial systems, its small size and low profile make it an ideal choice in limited space systems. It also makes an excellent choice for renewable energy devices due to its wide input and output voltage ranges.

Working Principle

The A4490EES-T utilizes a switching regulator topology to achieve the regulation of output voltage. A switching regulator works by switching on and off a transistor at a specific frequency to regulate the output voltage. The frequency at which the transistor is switched is determined by the control circuit and is adjusted based on the desired output voltage set by the user. This type of regulator is much more efficient than traditional linear regulators and is able to provide accurate output voltages regardless of input voltage or load conditions. Additionally, since there are no linear elements, the A4490EES-T is much smaller and requires less quiescent current than traditional linear regulators.

Conclusion

The A4490EES-T is a versatile and cost-effective integrated circuit that is ideal for current and voltage regulation in a wide variety of applications. Its wide input voltage range and high power density make it an excellent choice for smaller, more efficient portable devices, while its wide operating temperature range and small package size make it ideal for automotive and industrial systems. Additionally, its use of a switching regulator topology results in improved efficiency, lower quiescent currents, and smaller package sizes compared to traditional linear regulators.

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