RT9073-18GB

Voltage Dropout (Max):	0.8V @ 250mA
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	75dB (1kHz)
Current - Quiescent (Iq):	3µA
Current - Output:	250mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
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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Introduction

RT9073-18GB is a low dropout linear voltage regulator from Richtek Technology. It is designed to deliver a high performance and reliable output voltage regulator in small size and low cost. The main applications of RT9073-18GB include power supply systems, voltage regulator and voltage converter. This paper will discuss its application field and working principle.

Application Field

RT9073-18GB can be applied in constant current or voltage source. It is suitable for providing a stable output voltage of 0.8V to 18V with excellent linear regulation. There are mainly two types of RT9073-18GB application: The first one is in personal computers, notebook computers and other electronic equipment, which requires low dropout voltage and high accuracy output voltage. RT9073-18GB is also used in battery powered systems, such as portable audio players, mobile phones and personal digital assistants. It is also ideal for using in audio system and power supply applications. The second type of application is in industrial control applications. It is designed to provide a reliable, high accuracy voltage for the implementation of control algorithms. RT9073-18GB has low ripple characteristics, which make it fit for industrial applications.

Working Principle

RT9073-18GB is an advanced low dropout voltage regulator. It consists of an internal power transistor, a power dissipation resistor and a three-terminal negative feedback control circuit. The input voltage is applied to the transistor base, causing the transistor to turn on and supply power to the load. The current passing through the control circuit is proportional to the voltage drop across the control circuit, creating a negative feedback source. The negative feedback adjusts the output voltage to the regulated level. The RT9073-18GB has a maximum load current of 1.5A, which is suitable for most full-curve normal operation applications. It also offers full thermal shutdown for over-temperature protection and is also designed for low output voltage operation.

Conclusion

In conclusion, the application field and working principle of Richtek’s RT9073-18GB low dropout linear voltage regulator has been discussed. This device has been designed to offer a current rating of 1.5A and an output voltage range from 0.8V to 18V. The two main application areas for this regulator are personal computers and industrial control applications. Moreover, it has excellent linear regulation, lower dropout voltage and low ripple characteristics which make it an ideal choice for many applications.

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