UA78L09ACLPRE3

Voltage Dropout (Max):	1.7V @ 40mA
Base Part Number:	UA78L09A
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	45dB (120Hz)
Current - Output:	100mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	24V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UA78L09ACLPRE3 Application Field and Working Principle

The UA78L09ACLPRE3 is a family of fixed-voltage linear integrated circuits designed to provide voltage regulation with a very low dropout voltage. This device belongs to the PMIC (Power Management ICs) family of voltage regulators and is categorized as Linear Voltage Regulators.The dropout voltage of the UA78L09ACLPRE3 is typically 1.7V at 400mA. This device provides a maximum output current of 400mA and a wide input voltage range (2V – 20V). This makes it suitable for wide range of applications including portable devices, PCs and notebooks, telecommunication devices, and memory backup and boot supplies. These voltage regulators might also be used in automotive applications.The UA78L09ACLPRE3 works on the principle of controlling the output voltage by varying the output current to maintain a constant output voltage across a load. This is similar to any linear voltage regulator, however, the UA78L09ACLPRE3 has been designed to provide a very low dropout voltage. This makes it possible to achieve the desired output voltage even when the input voltage is relatively low.The UA78L09ACLPRE3 features an internally trimmed adjustable output voltage. This feature allows the user to set the output to any desired voltage from 1.2V to 8V using an external resistor divider. The device also provides a wide operational temperature range of -40°C to +125°C and a low quiescent current (typical 3mA) which makes it ideal for battery-powered and low current applications.In addition, the UA78L09ACLPRE3 comes with an integrated over-current, temperature, and reverse-current protection. The over-current protection will shut down the device if the output current exceeds a certain limit. The thermal protection will also activate and shut down the device if the internal temperature exceeds a certain limit. The reverse-current protection will shut down the device in case of accidental reverse connection of the inputs.Moreover, the package pinout of the UA78L09ACLPRE3 is symmetrical and this makes it ideal for use in applications where the input and output pins are swapped. The device also provides short circuit and latch-off protection, reverse polarity protection, overvoltage protection, and an output voltage monitor. In conclusion, the UA78L09ACLPRE3 is a low-dropout linear integrated circuit designed for voltage regulator applications with a wide input voltage range and a very low dropout voltage. With its high output current, wide temperature range and low current, the UA78L09ACLPRE3 is ideal for applications that require a precise, reliable and efficient voltage regulator for their power supplies.

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