LTC4121IUD-4.2#TRPBF

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The LTC4121IUD-4.2#TRPBF is an integrated power management integrated circuit (PMIC) designed specifically to manage battery charging and power management functions for a wide variety of applications. It is a part of a family of products specifically designed to provide power management functions for industrial, automotive, communication and consumer applications. In this article we will discuss the application field and working principle of the LTC4121IUD-4.2#TRPBF.

The LTC4121IUD-4.2#TRPBF belongs to PMIC - Battery Chargers category. This integrated circuit is an intelligent peak current and constant-current/constant-voltage battery charger for single cell Li-Ion or Li-Polymer batteries, and it is capable of charging from USB ports or wall adapter. The internal voltage regulation allows charging from unregulated power sources such as USB ports. It is an integrated solution to manage the power-consumption of mobile devices; it includes complete protection features to protect the power source, battery, and system against over-voltage and over-current. The LTC4121IUD-4.2#TRPBF has a very low battery current deficit (less than 10 mA) and a high efficiency (more than 95%) in the typical charging conditions.

Working principle: The working principle of the LTC4121IUD-4.2#TRPBF is based on an inductor-based switching converter that consumes a relatively low power output and charges the battery with a constant regulated current. The circuit detects the state of the battery voltage, and an integrated current limiting feature allows selection of a constant current limit that ensures the battery is charged in a controlled manner and the power dissipated in the system is kept within the specified limit. The charging current also depends on the battery temperature, so the temperature of the battery is taken into consideration for controlling the current. The LTC4121IUD-4.2#TRPBF includes an integrated safety timer and safety circuitry that provides protection from overcharging and protects the system from overcurrent conditions.

The various applications of the LTC4121IUD-4.2#TRPBF are as follows:

• It is used for mobile device applications such as cellular phones, PDAs, GPS systems, laptops, etc. It can charge a battery in a very short time.
• It is suitable for applications where precise current control at constant voltage is required such as automotive, industrial, communication and consumer applications.
• It can be used for portable medical devices, automatic test equipment, etc.
• It is suitable for a fast charger application.
• It is also suitable for solar powered systems which require a highly efficient and reliable design.

To summarize, the LTC4121IUD-4.2#TRPBF is an integrated solution to manage the power-consumption of mobile devices. The integrated circuit is an intelligent peak current and constant-current/constant-voltage battery charger for single cell Li-Ion or Li-Polymer batteries and it is capable of charging from USB ports or wall adapter. It has an integrated voltage regulator for charging from unregulated power sources and it includes complete protection features to protect the power source, battery and system against over-voltage and over-current. The working principle is based on an inductor-based switching converter. It has various applications such as mobile device applications, portable medical devices, solar powered systems, etc.

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