AN79L05ME1

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AN79L05ME1 Application Field and Working Principle

The AN79L05ME1 is an ultra-low voltage, low-power linear regulator with ultra-low quiescent current. It provides a regulated output voltage of 5.0V ± 0.3V, and is ideal for any application that requires a low quiescent current, such as personal and low-cost medical devices, as well as IoT devices. It is part of Panasonic’s PMIC (Power Management IC) family of voltage regulators.

For smaller portable devices, such as smartphone and tablets, the AN79L05ME1 provides a very efficient, compact, and robust solution. Its ultra-low quiescent current makes it suitable for applications that require a low-power solution. Its very low noise and excellent output regulation also makes it ideal for any audio application.

Working Principle

The AN79L05ME1 is a linear voltage regulator. It works by using a feedback loop to compare the output voltage with a reference voltage and adjust the input voltage to maintain a regulated output. The output voltage is regulated within 0.2V to 5.2V range, making it suitable for most applications.

The regulator features a low dropout voltage of 0.3V, enabling it to operate at extremely low input voltages. This makes it ideal for applications that need to operate from a single-cell Li-Ion battery, or when powering a low-power system.

The AN79L05ME1 utilizes an advanced, high-accuracy error amplifier, enabling it to have a fast transient response and an extremely high power supply rejection ratio (PSRR). It also makes use of an advanced voltage reference to ensure accurate output voltage regulation.

Protection

The AN79L05ME1 provides many protection features to ensure reliable, safe operation. It has a thermal shutdown for overtemperature protection, as well as output over current protection. It is also designed with a built-in current limiting circuit and a low-voltage lockout for low-voltage system resets.

The device also offers overvoltage protection, which prevents the output voltage from falling below the regulated level, and reverse current protection, which helps protect from accidental reverse current flow.

Design Considerations

The AN79L05ME1 has many features that make it suitable for a variety of design applications. When designing a system with the AN79L05ME1, it is important to consider the temperature range, input and output voltage, operating current, operating frequency, and fuses. The device is rated to operate over the -25 to 85°C temperature range, and the input voltage must be at least 0.2V higher than the output voltage.

The AN79L05ME1 can support up to 500mA of output current, but for higher output current it is recommended to use a lower quiescent current, low dropout voltage linear regulator. The device has a switching frequency of 200kHz, which is suitable for most applications, but if higher switching frequencies are needed, it is recommended to use a switched-mode regulator.

Finally, it is also important to consider using input and output fuses to further protect the system from in-rush current, overvoltage and overcurrent conditions. The use of fuses is optional, as the device has in-built protection, but it is recommended for optimum protection.

Conclusion

The AN79L05ME1 is an ultra-low voltage, low-power linear regulator with ultra-low quiescent current. It provides a regulated output voltage of 5.0V ± 0.3V, and is ideal for any application that requires a low quiescent current, such as personal and low-cost medical devices, as well as IoT devices. It works by using a feedback loop to compare the output voltage with a reference voltage and adjust the input voltage to maintain a regulated output. The device also offers several protection features, such as thermal shutdown, output over current protection, current limiting, low-voltage lockout and over voltage protection. When designing a system with the AN79L05ME1, it is important to consider the temperature range, input and output voltage, operating current, operating frequency, and fuses. Overall, the AN79L05ME1 is a reliable, compact, and efficient solution for powering a variety of low-power applications.

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