A4490EESTR-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:	Active
Packaging:	Tape & Reel (TR)

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A4490EESTR-T is a DC-DC buck controller that ships in an 8-pin SOIC package from Allegro MicroSystems. It is used to regulate voltage in an efficient manner. The A4490EESTR-T supports a wide input voltage range from 8V to 24V and provides an adjustable output voltage range from 0.6 V to 15V. It is suitable for a variety of Automotive, Industrial and Medical applications. The A4490EESTR-T utilizes highly efficient current-mode topology to ensure high power conversion efficiency and fast transient response. It implements a fixed frequency current mode control scheme which provides high frequency operation while offering excellent line and load regulation. The low external parts count and internal under-voltage lockout feature provide an added layer of protection and improved system reliability. The A4490EESTR-T integrates a MOSFET driver, logic and protection circuitry, error amplifier, oscillator, and a PWM control section with internal compensation. The error amplifier is used to compare the output voltage against an internal or external reference voltage. If the output voltage decreases, the error amplifier increases the duty cycle, reversing the current and raising the output voltage. When the output voltage corresponding to the set point is reached, the error amplifier reduces the duty cycle to maintain a constant output voltage. The high frequency operation of the A4490EESTR-T is achieved using a clock oscillator to generate a signal for the PWM generator. This clock frequency can be synchronous with a signal from an external source. The internal MOSFET driver is capable of driving a power MOSFET with a peak-gate current of around 5 A. The external gate resistor is used to set the transistor gate-threshold and the external ceramic capacitor is used to filter the switching noise. The A4490EESTR-T also addresses a wide range of safety and protection features. These include over-temperature protection, input under-voltage lockout, maximum duty limit, constant frequency operation, and cycle-by-cycle current limit. Additionally, the chip includes gate drivers with sink and source current limited to avoid over-voltage of the gate pins and it can also support a temperature reduction algorithm. The A4490EESTR-T is an ideal solution for any system requiring efficient and accurate voltage regulation. Its wide input regulation range and various built-in protection mechanisms make it an ideal choice for automotive and industrial applications requiring a reliable and cost-effective voltage regulator.

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