A4492EESTR-T Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	A4492
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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A4492EESTR-T DC DC Switching Regulators Application Field And Working PrincipleThe A4492EESTR-T is an advanced DC-DC switching regulator designed for space-saving applications in the power management integrated circuit (PMIC) market. It features a wide input voltage range, high efficiency, and low output ripple. The A4492EESTR-T is ideal for high-voltage non-isolated buck converters.

The Application Field of A4492EESTR-T

• Power management for CPU SoCs, metering systems, LED lighting, telecom, hand-held devices, and motor control services.
• High voltage non-isolated buck converters.
• Point of Load (PoL) applications.
• Multi-phase converters in server applications.

The Working Principle of A4492EESTR-T

The A4492EESTR-T DC-DC switching regulator works by switching current from a higher input voltage to a lower output voltage. The switching process is controlled by an integrated gate driver, which is triggered by a direct current (DC) control voltage. The A4492EESTR-T regulator ensures a stable output voltage by using peak current mode control and simultaneous pulsed current-sense techniques.

High-Frequency Switched-Mode Operation

The A4492EESTR-T regulator works in a high-frequency switched-mode mode of operation to minimize its size and energy losses. During switching mode operation, the driver modulates the power switch in order to maintain a constant output voltage. This is accomplished by sensing the input and feedback voltages with the same time. When the input voltage is lower than the output voltage or the input voltage is too high, the driver will turn on the power switch to increase the inductor current and consequently, the output. When the input voltage is higher than the output voltage or the input voltage is too low, the driver will turn off the power switch and the inductor current will reduce and the output voltage will converge to the reference voltage.

Internal Soft Start and Over-Current Protection

The A4492EESTR-T regulator includes a unique soft-start feature that reduces output voltage transients on start-up. The soft-start circuit allows the output voltage to gradually increase from a low to a nominal voltage. By gradually ramping the voltage, the soft-start not only helps to prevent voltage spikes but offers a more reliable start-up for system.In addition, the regulator offers an integrated current-sensing system that prevents the output from exceeding the over-current threshold. The current-sensing system continually monitors the current flow in the output and, when the current exceeds the pre-set threshold, the power switch is shut off, preventing any potential damage to the circuit.

Conclusion

The A4492EESTR-T is a high-efficiency DC-DC switching regulator designed for advanced space-saving applications. It features a wide input voltage range, high efficiency, low output ripple, and includes protection features such as integrated soft-start and over-current protection. It is perfect for high-voltage non-isolated buck converters, power management for CPU SoCs, metering systems, LED lighting, telecom, hand-held devices, and motor control services, making it the ideal choice for a variety of applications.

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