IL4812S

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DC-DC converters are electronic circuits used to convert DC voltage levels from one range to another. The IL4812S converter is a voltage regulator integrated circuit compatible to the 4A step-down DC/DC converter from the BQ25376 family of products from Texas Instruments. It helps design power-efficient DC/DC converters with further choice of output options and can be used for a wide range of applications running at anywhere from 3.3V to 36V input voltages.

Features

The IL4812S provides a maximum output current of 4A and is backward compatible with the BQ25376 family. The device includes features such as synchronous rectification, selectable operating frequency, integrated Synch-FET, Adaptive on-time control, and 80mV peak current detect and limit..

Applications

The IL4812S converter can be used for many different applications. Examples include portable battery-powered systems, power adapter and charger systems, and desktop/laptop adapter systems. It can also be used to drive LEDs, such as in LED lighting systems or backlighting applications. The device is designed to operate in a wide temperature range, from -40 to 125°C.

Working Principle

The IL4812S is a voltage regulator integrated circuit with an adjustable output voltage. It has an adjustable frequency of up to 1MHz and can maintain an output current of 4A. The device includes a Synch-FET that allows it to control the output current by switching it on or off. This enables it to regulate voltage and maintain current accuracy even during rapid fluctuations in load or input voltage. It also has a peak current-limit that protects against over-current situations.

The IL4812S also has an adaptive on-time control. This feature enables it to continuously adjust the switching frequency to maintain a desired output voltage and output current. This ensures constant voltage and stability even during rapid changes in ambient temperature and current surges. It also includes a soft-start feature that helps limit peak transient currents while output is in the process of ramping up to its desired level.

The IL4812S also includes variable frequency and synchronization. This feature enables it to synchronize with an external clock signal to reach higher switching frequencies than it could otherwise reach, allowing for more power-efficient designs. Additionally, the device has adjustable dead-time control, which enables it to synchronize the appearance of dead-time between the high and low sides during the switching process to improve power-conversion efficiency.

Conclusion

The IL4812S is a voltage regulator integrated circuit compatible to the 4A step-down DC/DC converters from the BQ25376 family of products from Texas Instruments. It can be used in a wide range of applications and is designed to operate at input voltages of up to 36V. The device includes features like synchronous rectification, selectable operating frequency, integrated Synch-FET, adaptive on-time control and 80mV peak current detect and limit, which make it an ideal choice for applications requiring high power efficiency. Additionally, the device is designed to handle rapid changes in load or input voltage in order to maintain accuracy and output stability.

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