ST8R00PUR Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	6V
Base Part Number:	ST8R00
Supplier Device Package:	8-DFN (4x4)
Package / Case:	8-VDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-25°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.2MHz
Current - Output:	3A (Switch)
Voltage - Output (Max):	12V
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction:

ST8R00PUR is an integrated circuit (IC) that regulates the amount of voltage used within circuits and provides protection from voltages that exceed a preset safe value. This IC is a part of a family of DC/DC switching regulators, which are commonly used in many electronic applications due to their flexibility, efficiency, and cost. This article will discuss the ST8R00PUR application field and working principle.

Application Field:

DC/DC switching regulators, such as the ST8R00PUR, are often used in applications such as power supplies, battery charge controllers, servers, and automotive systems. The switching regulators are highly efficient, often up to 90%, and provide a fixed output voltage regardless of the input voltage or power consumption. The device can also be used to reduce electrical noise and reduce input current ripple and noise.The ST8R00PUR is a monolithic synchronous buck switching regulator which provides a comprehensive set of features including an adjustable ultra-low dropout voltage, high switching currents up to 7A, and wide input voltage range (4.5V to 40V). The device also provides excellent system accuracy and fast transient response (with a switching frequency of 1MHz).

Working Principle:

The ST8R00PUR works by switching the power to the load circuit on and off at a very high frequency, and adjusting the duty cycle so that the output voltage is precisely regulated. This is achieved through the controlled switching of an inductor, which stores the energy, and a capacitor, which smoothes the output voltage. The output voltage is determined by two resistors, the top resistor, R1, and the bottom resistor, R2. When R1 is larger than R2, the output voltage will be proportional to R1. When R2 is larger than R1, the output voltage is proportional to R2. This is known as the volt-toggle effect.To supply to the load, the ST8R00PUR first switches the power to the load on and off at a very high frequency. This is achieved by the switching transistor, which is controlled by the logic circuit. When the switching transistor is on the inductor is energized, causing the output voltage to rise. After a set time, the transistor is turned off, causing the inductor to discharge and the output voltage to fall. By correctly timing these two parts of the cycle, the output voltage can be precisely regulated.The device also has a low dropout voltage, meaning that the output voltage remains stable even when the input voltage is close to the output voltage. This helps to minimize the power losses within the system and minimize the need for additional components.

Conclusion:

The ST8R00PUR is a DC/DC synchronous buck switching regulator used for regulating the output voltage of electronic circuits. It provides a high switching current, fast transient response, adjustable ultra-low dropout voltage, and wide input voltage range. The device also has an excellent system accuracy and volt-toggle effect that allows the user to precisely regulate the output voltage.

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