AN77L08

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AN77L08 Application Field and Working Principle

AN77L08 is a voltage regulator device that belongs to the family of linear PMIC (power management integrated circuits). This device is ideal for uses such as centralized power management, automotive applications and power supplies for low-voltage appliances. The working principle of this voltage regulator is simple as it follows the base rule of linear regulator that in order to supply a constant and regulated output voltage, it requires an input voltage of definite magnitude and greater than the required output voltage.

Design Features

The AN77L08 features an integrated MOSFET along with two differential amplifiers and a pair of reference outputs. It comes with a wide range of features such as internal current limiting, short-circuit protection and thermal protection. It also features a pull-down protection feature which helps in avoiding false triggering of external control. This device can deliver a load current up to 800mA and adjustable output voltage from 1.50V to 8.40V. It can also deliver a minimum current of 1mA to meet the low-cost power supply applications.

Application Fields

The AN77L08 is widely used in low-voltage applications with power management in industries such as automotive, medical and commercial electronic products. The AN77L08 has a very low quiescent current that makes it very suitable for use in automotive applications. The device is also very popular for battery-powered and standby applications. It can also be used in low-cost power supply applications such as power supplies for cell phones and PDAs.

Working Principle

This device operates on the simple principle of linear voltage regulation. When an input voltage greater than the required output voltage is supplied, the device maintains the output voltage by varying the amount of current that flows into and out of the output in order to achieve the required output voltage. This is done with the help of an internal comparator which compares the input voltage with the reference voltage and adjusts the output voltage accordingly.

The AN77L08 also provides over-voltage and over-current protection, thus eliminating the possibility of output voltage due to variation in the input voltage. This is done with the help of the integrated MOSFET structure and internal current limiting, which reduce the output voltage to a safe level when the current is higher than the specified maximum value. The device also has an integrated thermal protection feature which helps in maintaining the temperature of the regulator within safe operating temperature range.

The device has an adjustable output voltage with a range from 1.50V to 8.40V, making it very suitable for use in almost any type of application with power management needs. The device also has a very low quiescent current which helps in extending the battery life of the device. The device also features a power-on reset which helps in eliminating any startup problems.

Conclusion

AN77L08 is a voltage regulator device that belongs to the family of linear PMICs and is widely used in automotive, medical and commercial electronic products. It features an integrated MOSFET and two differential amplifiers along with two reference outputs and can deliver a load current up to 800mA and adjustable output voltage from 1.50V to 8.40V. It uses a simple principle of linear voltage regulation in order to maintain the output voltage. The device also provides important protection from over-voltage, over-current and thermal problems. Thus, AN77L08 is the ideal choice for any low-voltage application with power management needs.

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