L4995AK

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L4995AK is a type of linear voltage regulator from STMicroelectronics. It\'s a monolithic step-down regulator that provides a wide range of adjustable output voltages, from 0.9 V to 5.5 V. Thanks to its high power efficiency and low dropout voltage, this device ensures very low power dissipation during normal operation and standby supply, leading to longer battery life and cooler operations even with wide variation in environmental temperature.

The L4995AK is integrated with an on-board power MOSFET and it provides very high efficiency up to 95.5%. It has a wide output current range of up to 1A with very low output voltage ripple and low current ripple. The devices has protected circuits against input overvoltage, output overvoltage protection and output short circuit protected. It supports three different power-up and power-down modes to optimize battery lifetime, battery charger management and LED flickering control.

It also has a low supply current mode of startup that can reduce the power consumption during battery supply. The device is also equipped with I2C/SMBUS interface allowing for communication with EEPROMs/Flash memories, allowing for efficient battery charging management and monitoring options. The device is available in a 5-pin SOIC-8 package, making it suitable for space constrained applications.

The L4995AK is suitable for use in applications that require efficient power management, such as battery powered systems, industrial products, consumer appliances, point of sale systems, etc. It can be used for both portable and stationary power applications. It can also be used for voltage regulation in both AC and DC circuits, boosting input voltages up to 5.5 V.

The working principle of the L4995AK device is quite simple. The device takes an input voltage from a power source, such as a battery or a central power supply, and boosts it to a regulated voltage level as determined by a feedback loop. The regulation loop consists of a voltage reference, a comparator and an error amplifier. The voltage reference controls the output of the device, while the comparator compares the feedback voltage with the reference voltage to control the error amplifier. The error amplifier output is passed through a power MOSFET, which controls the output voltage.

In summary, the L4995AK is a high efficiency, low dropout voltage linear regulator. It\'s suitable for applications that require efficient power management, and can be used for both AC and DC circuits. The device can be used to boost input voltages up to 5.5 V and offers excellent protection against input overvoltage, output overvoltage and output short circuit protection. It also supports I2C/SMBUS interface for efficient battery charging management and monitoring options.

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