L4974A

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The L4974A is a DC-DC switching regulator made by STABIL. This Voltage regulator is a high performance step-down synchronous power converter with PWM control and optimized power components integrated in a single package. It can operate with low ripple input voltage and it is able to provide a low quiescent current that ensures a very low stand-by power dissipation. This voltage regulator can drive up to 6A continuous output current, with the possibility of reaching up to 20A peak output current. Moreover, it has an onboard integrated MOSFET transistor, allowing to control power supply that ranges from 4.5V to 30V.

This voltage regulator can use different control modes, such as PFM mode, PWM mode and the innovative AYPWMR mode. In the first two modes, the output voltage is obtained by two operations, when the current is in the first one, it is directed by the PWM controller and error amplifier, while in the second case, it is manipulated by the external power MOS transistor and the error amplifier. The AYPWMR mode has become an innovative, integrated system that combines the efficiency of Pulse-Frequency Modulation (PFM) with the improved transient and accuracy of Pulse-Width Modulation (PWM). This system will conventionally reduce the switching losses by switching in an additional lower duty cycle overlap cycle operation.

The L4974A voltage regulator is widely used in a variety of fields and applications. As it provides high efficiency and low quiescent current it is very well suitable for portable systems, such as mobile phones and tablets, but also in any kind of power supplies and battery charging applications. Moreover, this voltage regulator can be employed in automotive applications, such as dc-dc converters, industrial applications, such as programmable power supplies, and in high reliability applications, such as telecoms systems, where the integrated over-temperature protection and the fast transient response features make this device an unbeatable solution.

The working principle of the L4974A voltage regulator is based on switching regulator technology, where an internal power transistor switches with a specific frequency and pulse-width in order to reduce the input voltage to the desired output voltage. This is done following a closed loop system, where the amount of power going out to the load is feedbacked to the regulator in order to adjust the output voltage. A suitable control system ensures the correct operation of the device at any moment and allows to maximize the efficiency and performance of the regulator.

In conclusion, the L4974A voltage regulator is an innovative device from STABIL that can provide high efficiency, low stand-by power dissipation and fast transient response in a wide variety of applications. It features an integrated MOSFET transistor, as well as a range of different control modes, making this device an ideal choice for any kind of power supply or battery charging application.

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