The LTC4155EUFD#TRPBF is a sophisticated dual-input power manager and 3.5A capable Li-Ion battery charger designed by Linear Technology to cater to the modern demands of portable electronics. This integrated circuit provides a seamless transition between multiple power sources while maintaining a constant charge to the battery, ensuring that your device remains powered and operational at all times.

Key Features:

• Dual-Input Power Path: The LTC4155 allows for two separate power sources, typically one from USB and another from a wall adapter, optimizing the power usage and charging based on the availability and priority of the sources.
• High Charge Current: With support for up to 3.5A of charge current, the LTC4155 is capable of quickly charging large capacity batteries, making it ideal for high-power devices.
• Instant-On Operation: Even with a deeply discharged battery, the LTC4155 ensures that your device can turn on immediately when a power source is connected, thanks to its PowerPath control.
• Efficient Power Management: The device integrates a switching regulator to efficiently convert input power for charging, reducing heat and extending battery life.
• Thermal Regulation: To protect the battery and circuitry, the LTC4155 includes a thermal regulation feature that reduces charge current if the temperature of the device exceeds a preset threshold.
• Programmable Charge Parameters: Charge voltage, current, and termination are programmable via an I2C interface, allowing for customization to suit various battery chemistries and sizes.
• Robust Safety Features: The LTC4155 provides numerous safety features, including overvoltage protection, overcurrent protection, and battery temperature monitoring to ensure safe and reliable operation.

Designed to be used in a wide range of applications, the LTC4155EUFD#TRPBF is perfect for portable medical devices, industrial handhelds, and any other battery-powered electronic devices that require efficient and flexible charging solutions. Its compact, low-profile (3mm x 3mm) QFN package allows for easy integration into space-constrained designs, making it a versatile choice for modern portable electronics.