UA78L12ACPKG3

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Introduction to UA78L12ACPKG3 Application Field and Working Principle

The UA78L12ACPKG3 is an adjustable, 400mA, voltage regulator in the output, PMIC - Voltage Regulators - Linear family. It is a three-terminal device specifically designed for a wide range of power management applications. It features an on/off control, a P-Channel enhancement-mode power MOSFET, a low power consumption and a Thermal Shut-Down (TSD) circuit that helps protect the device against overheating.

The UA78L12ACPKG3 consists of an adjustable-output voltage regulator internally coupled to a negative current-limiting circuit. This device is designed to provide a regulated voltage output that is capable of delivering a constant current up to 400mA. It is designed to supply to various applications including digital circuits, portable devices, and other battery-powered applications where a higher efficiency is required.

Applications

The UA78L12ACPKG3 is particularly suitable for use in a variety of applications that demand regulation of output voltage. These include electrical and electronic devices, telecommunication systems, personal computers (PCs),audio systems, medical instruments, and various automation systems.

Features

The UA78L12ACPKG3 comes with a wide range of features that make it well suited for power management applications where a wide range of output voltage is required. These features include:

• Maximum Output Current: 400mA
• Operating Temperature Range: -40°C to 125°C
• Input Voltage Range: 2.5V to 18V
• Output Voltage Range: 1.2V to 16V
• Low Power Consumption: Typically 55μA
• Thermal Shut-Down (TSD) Circuit

The UA78L12ACPKG3 is protected from excessive dissipation by a Thermal Shut-Down (TSD) circuit that shuts-down the device when the temperature exceeds a predetermined threshold.

Working Principle

The UA78L12ACPKG3 is a linear voltage regulator that operates on the principle of controlling the input voltage with the aid of a feedback loop. In this device, the current source is connected to the negative terminal (ground) and the load is connected to the positive terminal. The output voltage is then regulated by applying a gate voltage to the P-channel MOSFET, which acts as a switch. This gate voltage is then regulated by the feedback loop.

The feedback loop consists of a voltage divider, consisting of two resistors/potentiometers. This voltage divider is connected to the output of the device, measuring the output voltage and sending this feedback to the input of the device. The input voltage is then adjusted accordingly, allowing for precise control of the output voltage.

Ultimately, the UA78L12ACPKG3 is an adjustable, three-terminal voltage regulator which is designed for a wide range of power management applications. It features an on/off control, a P-Channel enhancement-mode power MOSFET, a low power consumption and a Thermal Shut-Down (TSD) circuit that helps protect it against damage from excessive heat.

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