AP7365-20ERG-13

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AP7365-20ERG-13 Application Field and Working Principle

AP7365-20ERG-13 is a three-terminal, low dropout (LDO) linear voltage regulator with a maximum dropout voltage of 0.3V at 1A output current. It belongs to the category of PMIC (Power Management Integrated Circuit) Voltage Regulators – Linear, and is ideal for mobile device applications which require low quiescent current, fast transient response, as well as low dropout voltage.

Package and Features

Based on its SOT-25-5 power package, AP7365-20ERG-13 offers many features for system designers, including low quiescent current of 10μA, temperature range of -40°C to 125°C, solid state voltage of 1.5V to 12V, output current up to 1A and input voltage up to 6V. It also offers over-temperature/current protection from its on-chip thermal shutdown and current limit circuitry.

Circuit Operation

The AP7365-20ERG-13 uses a voltage reference in combination with an error amplifier, a current source and a series transistor to regulate the output voltage. Its input voltage is applied to the emitter of a series-pass transistor, the collector of which is connected to the output terminal. This series transistor is used to control the output voltage by monitoring the collector voltage relative to the output voltage. A voltage reference provides the reference voltage for the operational amplifier and the set point for the error voltage. The operational amplifier compares the two voltages and produces a current proportional to the difference, which is then applied to the base of a series transistor. This current controls the size of the series-pass transistor and regulates the output voltage.

The AP7365-20ERG-13 includes a current limit and an over-temperature protection which are also known as secondary limiters. When the output current exceeds the current limit or if the die temperature is too high, the current limit circuit will reduce the output current or shut down the regulator. This provides a safety-net for the regulator and prevents it from being damaged due to excessive current or heat.

Applications

AP7365-20ERG-13 is suitable for various DC-to-DC voltage regulating applications, such as computers, consumer electronics and mobile devices, which require low quiescent current, fast transient response, as well as low dropout voltage. It is appropriate for applications such as powering a microcontroller from the backlight of an LCD display.

In addition, AP7365-20ERG-13 is ideal for battery-based applications that require high efficiency, low quiescent current and fast transient response, such as mobile phone handsets, personal digital assistants (PDAs), digital still cameras, digital video cameras, laptop computers and digital music players.

Summary

The AP7365-20ERG-13 three-terminal, low dropout linear voltage regulator offers system designers a reliable and efficient solution to obtain a regulated output voltage. Its features such as temperature range of -40°C to 125°C, output current up to 1A, input voltage up to 6V, low quiescent current of 10μA, and fast transient response make it ideal for battery-based and low current applications.

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