L78L12ACUTR

Mounting Type:	Surface Mount
Package / Case:	TO-243AA
Supplier Device Package:	SOT-89-3
Base Part Number:	L78L12A
Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	12V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	100mA
Current - Quiescent (Iq):	6mA
Current - Supply (Max):	6.5mA
PSRR:	42dB (120Hz)
Control Features:	--
Protection Features:	Over Current, Over Temperature, Short Circuit
Operating Temperature:	0°C ~ 125°C

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Introduction

L78L12ACUTR is an integrated voltage regulator designed to provide a stable positive output voltage at 1.2 V and adjustable current. It is contained in a standard three pin Package, TO-92 and features current limiting, thermal overload protection, reverse polarity protection and safe area compensation. An external transistor is used to provide additional current if required. This device also includes a power on reset pin that allows the device to be turned on and off using external logic signals.

Application field

L78L12ACUTR is typically used for applications requiring low voltage regulation. It combines the features of a linear regulator, current limiter and thermal overload protection in a single device. It is ideal for applications where output voltage stability is required or where a small output current is necessary. It is also capable of providing a large output current when an external transistor is used.Some common applications of the L78L12ACUTR include battery-powered products, computers and monitors, portable medical devices, industrial process control systems and telecommunications equipment.

Working Principle

The L78L12ACUTR works by converting a higher input voltage to a lower, regulated output. This is achieved through a series of components, such as resistors, transistors and diodes that control the voltage on the output pin.The regulator has two main operating modes: active and standby. In active mode, the device compensates for input voltage variations, providing a stable output voltage. In standby mode, the device acts as a current limiter, preventing the circuit from drawing excessive current from the input supply.A reference voltage is used for both of these modes. This is provided by an external zener diode connected to the reference pin of the device. The zener diode is selected to ensure the output voltage remains within specified limits.The device also includes thermal and short-circuit protection, as well as a power on reset pin to enable the device to be switched on and off using external logic signals.

Conclusion

The L78L12ACUTR is an integrated voltage regulator designed to provide a stable positive output voltage at 1.2 V and adjustable current. It is contained in a standard three pin Package, TO-92 and features current limiting, thermal overload protection, reverse polarity protection and safe area compensation. It is suitable for applications such as battery-powered products, computers and monitors, portable medical devices, industrial process control systems and telecommunications equipment. The device is also capable of providing a large output current, when an external transistor is used.

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