RT9198-30GBR

Voltage Dropout (Max):	0.33V @ 300mA
Supplier Device Package:	SOT-23-5R
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	60dB ~ 30dB (100Hz ~ 10kHz)
Current - Quiescent (Iq):	130µA
Current - Output:	300mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3V
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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RT9198-30GBR Application Field and Working Principle

The RT9198-30GBR is a linear voltage regulator from Richtek Technology Corporation. It is designed as an integrated LDO (low dropout) controller, offering high accuracy and low operating current consumption. This regulator has a wide range of applications including application power supplies, computing and networking equipment, telecommunication equipment, charging system and numerous other electronic systems. The RT9198-30GBR consists of an error amplifier, an output driver stage, an oversized pass transistor, and an internal logic circuit. The oversized pass transistor is used to reduce the dropout voltage and provides a low output noise trade-off. The high-efficiency design and the thermal discharge when the chip is over temperature protected makes the RT9198-30GBR a high-performance LDO regulator. The basic working principle of the RT9198-30GBR is that it regulates the output voltage by comparing the feedback voltage (Vfb) to the reference voltage, which is usually an internal 2.5V voltage. When the output voltage is lower than the reference voltage, the error amplifier output voltage will increase and the output driver will adjust the gate voltage of the pass transistor to drive more current into the load and thus increase the output voltage. On the other hand, when the output voltage is higher than the reference voltage, the error amplifier output voltage will decrease and the output driver will decrease the gate voltage of the pass transistor to allow less current into the load. This process will repeat until the feedback voltage is equal to the reference voltage and the output voltage is stable. The RT9198-30GBR offers a wide input voltage range of 4.5V to 25V, and an adjustable output voltage range of 0.6V to 3.3V. It is capable of supplying output currents up to 300mA, with a typical dropout voltage of 130mV at 300mA. The device also has excellent load/line/temperature regulation, with a maximum line regulation of 0.4% and a maximum load regulation of 0.5%, and the temperature coefficient is only 45ppm/°C.The RT9198-30GBR also offers a number of features such as adjustable current limit, over-temperature protection, thermal shutdown and short circuit protection, and reverse polarity protection. The adjustable current limit circuit allows the user to select the maximum current to be regulated. The current limit is adjustable by connecting an external resistor between the CL and GND pins.The RT9198-30GBR is available in a SOT23-5 package making it suitable for applications requiring a miniature size solution, and has a storage temperature range of -65°C to +125°C. This device is RoHS compliant, making it suitable for applications where environmental concerns must be taken into account.In conclusion, the RT9198-30GBR from Richtek Technology Corporation, is a high-performance linear LDO regulator with excellent load/line/temperature regulation, over-temperature protection and adjustable current limit. It is ideal for portable devices, computing and networking equipment, telecommunication equipment, charging system and numerous other electronic systems.

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