UA78L05CLPE3

Voltage Dropout (Max):	1.7V @ 40mA
Base Part Number:	UA78L05
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	49dB (120Hz)
Current - Output:	100mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Bulk

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Introduction

The UA78L05CLPE3 is a monolithic three terminal voltage regulator manufactured by ST Microelectronics. It is a low drop-out (LDO) linear regulator providing a maximum output current of up to 500mA and a fixed output voltage of 5V. The device is designed to draw quiescent current of less than 150μA and has a typical 1.2V maximum drop-out voltage. With a high PSRR and low noise operation, the device is suitable for a range of applications where the supply noise is a concern.

Applications

The UA78L05CLPE3 is capable of providing a high level of output current, making it suitable for a range of applications where line regulation and low noise performance are a priority. The device is particularly well-suited for USB-powered devices, providing clean and stable 5V output. Additionally, its low quiescent current and low drop-out voltage make it an ideal choice for battery-operated devices, allowing extended operation time on the same battery charge.Other common applications for the UA78L05CLPE3 include:

• MP3 players
• Mobile phones
• Notebooks
• Digital cameras
• Wearable devices
• Sensor-based systems
• Automotive systems
• Lighting systems

Working Principle

The UA78L05CLPE3 is a low drop-out linear voltage regulator. It operates on the principle of a pass transistor, with an input voltage connected to the collector of a pass transistor and the output voltage connected to the emitter of the pass transistor.The base of the pass transistor is driven by a voltage reference, which is typically fixed to a standard value (such as 5V for the UA78L05CLPE3). For each unit increase of the input voltage, the output voltage increases by the same amount. This ensures that the voltage remains constant, even when the input voltage varies. The differential voltage across the base-emitter of the pass transistor can be adjusted by the operating current. When the desired output voltage is reached, the controlling bias current is set, and the regulator automatically adjusts the output voltage over the specified range.

Conclusion

The UA78L05CLPE3 is a low drop-out linear voltage regulator with a fixed output voltage of 5V. Its high level of output current and low quiescent current make it suitable for a wide range of applications, such as USB-powered devices, mobile phones, and automotive systems. The device operates on the principle of a pass transistor, with a reference voltage driving the base of the pass transistor. When the desired output voltage is reached, the controlling bias current is set and the output voltage is automatically adjusted.

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