REG103UA-3

Current - Output:	500mA
Base Part Number:	REG103-3
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	65dB (120Hz)
Current - Supply (Max):	1.3mA
Current - Quiescent (Iq):	0.7mA
Series:	--
Voltage Dropout (Max):	0.28V @ 500mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3V
Voltage - Input (Max):	15V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tube

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Introduction REG103UA-3 is one of the linear voltage regulators from Richtek Technology Corporation. It provides extremely low dropout voltage, low supply current, and excellent accuracy for better system performance. The device features high-efficiency voltage regulation, excellent transient response and line regulation, and other features that make it ideal for a variety of applications. Application REG103UA-3 is designed for use in low voltage, ultra-low power applications that require very low dropout voltage, such as portable applications. It is commonly used in extended battery-powered electronic equipment, as well as in medical equipment, display driver circuits, cellular phones, and computer peripheral equipment. The regulator combines a low dropout voltage with greater than 94% efficiency in order to provide up to 25mA with a maximum dropout voltage of 0.63V. This combination makes it suitable for low current, low noise applications.Features The device features several performance enhancing features that make it attractive for a variety of applications. These include: 1. High current output, up to 25mA 2. Low supply current 3. Extremely low dropout voltage, 0.63V maximum 4. Excellent accuracy, ±2% 5. Excellent transient response, over 30mV dropout 6. Line and load regulation of ±15mV (max)7. Very fast turn-on 8. Wide input voltage range of 2.6V to 44VWorking Principle The basic operation of the REG103UA-3 regulator is that it adjusts the output voltage in response to input voltage and load conditions. A 5V feedback voltage is generated by comparing a divided down version of the output voltage to a reference voltage. This feedback voltage is used to adjust the output voltage to the desired regulated value. The regulator includes a high-gain amplifier and a pair of PNP/NPN transistors which form a voltage error amplifier. The feedback voltage is applied through the error amplifier which adjusts the output voltage by changing the base to emitter bias of the output transistors. The regulator also includes a compensation circuit which reduces the effect of load changes. This allows the output voltage to remain more stable over a wide range of operating conditions. ConclusionREG103UA-3 is a linear voltage regulator designed for use in low voltage, ultra-low power applications. It provides high efficiency voltage regulation, excellent transient response, and a wide input voltage range to allow it to be used in a variety of applications. It is ideal for low current, low noise, and long battery life requirements.

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