S-8521D20MC-BXFT2U

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Power management integrated circuits (PMICs) are semiconductor integrated circuits which are designed to monitor and control the power in electronic systems including batteries, electricity supplied from an external source, and connected components. Voltage regulators are a key element of power management integrated circuits, using circuitry to maintain the output voltage of a system within the optimal range. DC DC Switching Controllers are a specific type of voltage regulator, using different voltage configurations to maintain constant voltage and convert to different voltages when necessary. One of the most prevalent DC DC Switching Controllers is the S-8521D20MC-BXFT2U, which is a small, low-power synchronous step-down switching regulator IC.

Features

The S-8521D20MC-BXFT2U features a ‘synchronous rectifier step down DC/DC converter’, meaning it can efficiently convert high voltage and current from a power supply system into a regulated low voltage and current. The regulator has a wide power supply range of 1.7V to 5.5V, and a constant output voltage down to 0.8V.

It has two operating modes; ‘Fixed Mode’ and ‘Burst Mode’, with the latter using pulse width modulation to maintain a constant output current with a low quiescent current. This reduces the current draw when a system is in a low power state, prolonging battery life. Commonly accessed features include soft-start, reset and enable functions, fast PWM response ratio and frequency, and parameter setting.

Application Field

The S-8521D20MC-BXFT2U is designed for low power applications such as portable devices, battery operated equipment and household products. It can be used for a variety of applications, from providing a regulated voltage output for LED lighting, to providing a voltage source for a DC/DC converter.

The S-8521D20MC-BXFT2U is also used in a variety of industrial equipment, particularly robotics and automation. Its low power draw, wide power supply range and fast response time make it well suited to machines which require a constant steady voltage and current to function correctly.

How Does it Work?

At its core the S-8521D20MC-BXFT2U is a DC/DC switching regulator IC, working by converting a high voltage input from a power supply system into a steady, low voltage output. This is achieved by using a ‘synchronous voltage regulator’, a form of switching regulator which uses high speed transistors to switch the input voltage to the output voltage.

The operating mode of the regulator is determined by the burst and fixed settings of the pulse width modulation. In fixed mode, the regulator regulates the voltage with a constant on-time, while in burst mode it uses the pulse width modulation to adjust the voltage output. The output voltage is then regulated by varying the duty cycle of the power transistors, providing a steady voltage output with minimal power consumption.

Conclusion

The S-8521D20MC-BXFT2U is a popular DC/DC switching regulator IC which has a wide range of uses in low power applications and industrial control systems. With its wide power supply range, constant output voltage down to 0.8V, fast PWM response ratio and frequency, and low power quiescent current, the S-8521D20MC-BXFT2U is a reliable, efficient and compact way to regulate power in many different types of applications.

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