LTC3552EDHC#PBF - USB Power Manager with Overvoltage Protection

The LTC3552EDHC#PBF is a highly integrated power management solution from Linear Technology, designed to simplify the task of power supply design for portable USB-powered devices. This compact, feature-rich component combines a linear charger, a synchronous step-down converter, and an overvoltage protection circuit, all housed within a small, 16-lead DFN package (4mm x 3mm).

Integrated Linear Charger

The device incorporates a full-featured battery charger with programmable charge current up to 1.5A, which allows for the fast charging of single-cell lithium-ion or lithium-polymer batteries. The charger automatically adjusts the charge rate based on the power available from the USB input, ensuring that the device operates within the USB power specifications. Additionally, it supports a 'standalone' charging mode, which does not require any external microcontroller for charge termination.

Synchronous Step-Down Converter

Alongside the charger, the LTC3552EDHC#PBF boasts a high-efficiency, synchronous buck converter capable of delivering up to 600mA of continuous output current. This converter can operate with an input voltage range from 2.75V to 5.5V, making it versatile for various applications. The buck converter's 2.25MHz switching frequency minimizes the size of external components and keeps switching noise out of critical RF bands.

Overvoltage Protection

To safeguard against input overvoltage conditions, the LTC3552EDHC#PBF integrates an overvoltage protection circuit that disconnects the input from all other internal circuits when the input voltage exceeds a preset threshold, thus protecting the downstream circuits from damage.

Additional Features

The product also offers a host of other features, such as automatic load prioritization, which gives preference to the system load over battery charging, a PowerPath control that seamlessly manages power distribution between the input, battery, and load, and an instant-on operation to keep the system alive even with a deeply discharged battery.

Overall, the LTC3552EDHC#PBF is a versatile and compact solution for managing power in USB devices, providing designers with a reliable and efficient way to extend battery life, protect against power irregularities, and reduce the overall component count in portable applications.