LTC3554EPD#TRPBF

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The LTC3554EPD#TRPBF is a stand-alone Single-cell Li-Ion/Li-Polymer charger and boost power manager. It integrates two ultra-high efficiency DC/DC converters with a host of features specifically designed to provide a robust and flexible charging solution for a wide range of battery-powered applications.

Overview

The groundbreaking LTC3554EPD#TRPBF delivers the perfect balance between charging parameters, flexibility and integration. The part is able to simultaneously accept input power, charge the Li-Ion/Li-Polymer battery and supply the system with regulated voltage.

The integrated Li-Ion/Li-Polymer charge controller provides precised fast-charge (1.5A) and constant-current/constant-voltage charging for single cell 18650 systems. An adjustable boost converter is also included for autonomous voltage regulation, offering output voltages of up to 5.5V and operating from input voltages of 2.7V to 5.5V.

Application Field

The LTC3554EPD#TRPBF is ideal for a wide range of applications. Its combination of high-efficiency Buck-Boost and battery charging functions makes it especially suited for portable electronic devices, including tablets, cellphones, PMPs and portable data acquisition systems.

The combination of charge-coupled synchronous buck and boost topology provides a high-efficiency power solution in applications where the available input power is variable, and the output voltage must be maintained within tightly regulated limits.

Working Principle

The LTC3554EPD#TRPBF integrates a Li-Ion/Li-Polymer charge controller, buck and boost converters, and a high speed comparator. With its combination of features, the part is able to maintain input voltage level, boost the voltage and regulate output voltage regardless of changes in input voltage direction.

The buck-boost topology provides high efficiency, even during varying load conditions. The LTC3554EPD#TRPBF is able to reduce output voltage ripple by compensating for voltage differences due to variations in current load. Furthermore, the integrated charge controller monitors and regulates the charge current independent of the output current or load.

The LTC3554EPD#TRPBF ensures accurate voltage regulation by using an integrated high speed comparator to detect and adjust input voltage fluctuations. It samples the system voltage every 40us and adjusts the output voltage accordingly. The integrated output over-voltage protection circuitry further enhances the reliability of the system.

Conclusion

The LTC3554EPD#TRPBF can significantly reduce the size and complexity of power systems by combining three distinct functions into a single part. It offers high-efficiency charging, boosting and voltage regulation for single-cell Li-Ion/Li-Polymer-powered systems, making it an ideal choice for portable electronics such as tablets, cell phones, and PMPs.

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