RT9198-25GBR

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PMIC - Voltage Regulators - Linear includes various kinds of Linear Voltage regulators, providing a convenient, low-cost and flexible solution for power supply design. RT9198-25GBR is one kind of them. This application note provides the introduction of application field and working principle of RT9198-25GBR, and the related detailed operational information.

RT9198-25GBR is a low-quiescent current and low-dropout linear voltage regulator, integrating a high performance and wide frequency amplifier. It has a wide input voltage range of 2.3V to 5V, making it ideal for applications requiring input voltage varying widely. The output voltage range is adjustable from 0.9V to 1.5V. This device also provides short-circuit protection, over-current protection, over-temperature protection features. It has a low-power functionality which can reduce power consumption when the load is light or when the quiescent point is adjusted. The chip’s load current of Load Short circuit current (LSC) is 250mA, and its temperature range is 0℃ - 125℃.

RT9198-25GBR is applicable for many different applications such as handheld consumer electronics, wireless communication systems, battery powered devices, and notebook computers etc. For example, in consumer electronics, it has the advantages of a low quiescent current, a wide voltage range, high peak current output and good line regulation, which improves system efficiency and accuracy. In wireless communication systems, the high frequency and wide bandwidth give the controller ICs greater flexibility. In battery powered devices, the low power consumption can extend the battery life. In notebook computer, its low dropout voltage keeps the voltage low and enhances the communication performance.

The working principle of RT9198-25GBR is relatively simple. Its main purpose is to control the output voltage, by compensating for the voltage drop due to the load current. It has an input voltage range from 2.3V to 5V and an output voltage range from 0.9V to 1.5V. The device’s internal circuitry includes an error amplifier, a voltage reference, a pass transistor, and a current limiter. It also has a feedback loop to ensure stability. The feedback loop is composed of two resistors, one of which is an adjustable resistor. The adjustable resistor is made up of two resistors connected in series, one of which is a variable resistor. This enables the output voltage to be adjusted according to different applications. The voltage reference used in the device is the bandgap reference, which is used to provide a stable reference voltage.

The input voltage is fed into the error amplifier, which amplifies the voltage error between the output voltage and the reference voltage. The amplified voltage error will then drive the pass transistor, causing the transistor to open or close depending on the voltage error. This will cause the output voltage to rise or fall as required. The current limiter protects the device from excessive current by turning off the pass transistor when the current exceeds the maximum safe operating current.

In summary, RT9198-25GBR is a low-quiescent current and low-dropout linear voltage regulator, ideal for applications requiring input voltage varying widely. Its wide input voltage range, high peak current output, good line regulation, and low power consumption make it a great choice for battery powered devices, handheld consumer electronics, wireless communication systems and notebook computers, to improve system efficiency, accuracy, and communication performance. Its working principle is relatively simple, using an error amplifier and a voltage reference to control the output voltage.

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