RT9199GS

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RT9199GS Application Field and Working Principle

RT9199GS is a special purpose voltage regulator, specifically manufactured by Richtek Technology Corporation. It is a low drop-out (LDO) regulator, and its principal application field is the area of person-to-person communications. This includes incoming and outgoing calls, whether they occur via a cellular network, landlines and VoIP networks.

The RT9199GS operates with input voltages in the range of 4.0 V to 6.3 V. Its output voltage is generally 3.3 V, though it is adjustable over the range of 0.8 V to 5.0 V (using two external resistors), for use in applications requiring custom voltage curves.

It has a maximum current capability of 500 mA and features short current protection, over-temperature protection, over-voltage protection, fast-transient response and soft-start, among other security features and softstart circuitry.

The RT9199GS is an SOT-23-5 packaged part that is optimized for space- and energy-constrained applications such as mobile phones, personal digital assistants and other hand-held devices. It is surface mountable, and the small size allows for the integration of greatly increased functionality into new and existing product designs. Additionally, it is composed of a very low quiescent current of 4 μA, making it highly efficient and power-saving.

The RT9199GS is composed of a reference voltage circuit, an error amplifier, a current limit circuit, a power MOSFET switch and a thermal shut-down circuit.

The voltage regulation follows the same principle as other LDO regulators. A reference voltage is generated, and it then outputs the equivalent of a current amplifier to control the voltage on the output. This reference, known as the error amplifier, compares the voltage at the output with a reference voltage. When the voltage at the output is lower than the reference, the error amplifier provides a signal to turn the switch on, and when the voltage at the output is higher than the reference, the same error amplifier provides a signal to turn the switch off. Thus, the output voltage is always regulated using the reference voltage as a guide.

As the load current changes, the error amplifier senses this and it is able to adjust the output voltage accordingly. This makes the RT9199GS a very capable voltage regulator, as it is able to satisfy both varying small and large load currents.

In addition to the dedicated reference and error amplifier circuitry, the RT9199GS also has many safety features that can guard against over-voltage, over-temperature and short-current conditions. These features are designed to reduce the possibility of damage to the device and other components.

The RT9199GS also features soft-start circuitry to ensure that supply voltages and other conditions can be safely and smoothly started upon power-up. This helps to reduce the need for a large minimum-start allowance during re-starts, and furthermore, can help to reduce the inverse-polarity charge that may have built up during shutdown.

The RT9199GS is suitable for use in a variety of low voltage applications, and is especially beneficial in applications related to person-to-person communications systems where small size and power-efficiency are necessary. Its wide input range and adjustable output voltage (for custom curves) also makes it a versatile voltage regulator that is suitable for a wide variety of low power designs.

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