RT8228BGQW

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The RT8228BGQW is part of the DC DC switching controllers in the PMIC (Power Management IC) voltage regulators family that helps to serve a wide range of power supply designs. It is featured with power output programmable that provides a low cost, flexible and simple power supply solution. It supports a wide range of input voltage which covers the whole operating range of the power device, making it suitable for almost any portable device.

The main function of the RT8228BGQW is to regulate the output voltage in the second order loop. This is achieved by controlling the on/off period of the switching action. It features a peak current mode architecture with a voltage feedback comparator and resistors for programming the peak current. A pulse width modulator is also used to regulate the output voltage by controlling the duty cycle with a fixed oscillator frequency.

The main features of the RT8228BGQW includes a wide range of output voltage selections. It also supports two different switching frequency selection, either using a linear low dropout (LDO) regulator or an external fixed frequency clock (CLK). It has an excellent output voltage accuracy at 80mV and provides high ruggedness performance. In addition, it has programmable current protect with an external resistor divider and a programmable soft startup time which supports a bicycle mode of operation.

The RT8228BGQW has the ability to support multiple current outputs, has a low quiescent current of 100uA and has an adjustable soft-start on/off time that is adjustable with an external resistor divider. It supports a very low input/output voltage differential of 0.4V. Its high power capabilities provides an extremely low output voltage ripple and fast transient response which makes it suitable for powering multiple current outputs from a single voltage input.

Features of the RT8228BGQW which makes it suitable for the application field includes its high switching performance that enables it to provide a wide input voltage range. It also has excellent thermal and voltage protection features to ensure safety, reliability and durability. It has wide temperature range operation and an adjustable soft-start that is suitable for high-power applications.

The working principle of the RT8228BGQW is very simple. The device controls the output voltage through a combination of the pulse width modulation and a voltage feedback comparator. The comparator monitors the feedback voltage of the output voltage and adjusts the pulse width to maintain the feedback voltage within certain voltage range. The pulse width is regulated by the oscillator and it determines the switching on/off period of the switch. The frequency of the oscillator determines the output frequency of the device, therefore allowing for an easy adjustment of the output voltage with the same frequency.

In summary, the RT8228BGQW is a part of the PMIC voltage regulators family and is categorized under the DC DC switching controllers. It is featured with power output programmable that provides a low cost, flexible, and simple power supply solution. It has multiple current outputs, wide temperature range operation, low quiescent current, adjustable soft-start, and adjustable current limit. It also has excellent thermal and voltage protection features which makes it suitable for the application field. Its working principle is based on the pulse width modulation and voltage feedback comparator which regulates the on/off period of the switch to maintain the output voltage in the desired range.

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