Linear Technology LTC3557EUH Integrated Power Management Solution

The LTC3557EUH from Linear Technology is a highly integrated power management and battery charger IC designed to cater to the demanding needs of portable applications. This compact, efficient solution combines a linear battery charger, a synchronous step-down DC/DC converter, and two synchronous step-up DC/DC converters, all within a single package. The LTC3557EUH is specifically tailored for space-constrained environments where multiple power rails and battery charging capabilities are required.

Key Features

• Multi-Function Integration: The LTC3557EUH integrates a full-featured battery charger with PowerPath management, which allows for instant-on operation even with a dead battery. The charger is capable of up to 1.5A charge current from a wall adapter or USB input, with proper thermal regulation to ensure safe operation.
• High-Efficiency Power Conversion: It includes a high-efficiency, synchronous, buck regulator that can deliver up to 600mA of continuous output current. The buck regulator operates at a fixed frequency and uses a current mode architecture to provide excellent line and load regulation.
• Dual Boost Converters: Two additional boost converters provide regulated outputs of 5V at up to 100mA, which can be used to power peripherals that require a higher voltage than the battery can provide.
• Programmable Inputs: The LTC3557EUH features programmable inputs for wall adapter and USB current limits, allowing devices to conform to USB power specifications.
• Autonomous Operation: The IC supports autonomous operation, which simplifies system design by not requiring external control for transitioning between power sources or charging states.
• Protection Features: Built-in safety features include overvoltage protection, thermal regulation, and a battery temperature sensing input that ensures safe charging under all conditions.

Applications

The LTC3557EUH is suitable for a wide range of portable devices, such as smartphones, tablets, portable media players, and other USB-powered gadgets. Its high level of integration and power efficiency makes it an ideal choice for designers looking to maximize battery life while minimizing space and component count.

Package and Availability

This power management IC is available in a compact, 24-pin QFN package (3mm x 5mm), which is designed to occupy minimal board space. The LTC3557EUH is available for order from Linear Technology and its authorized distributors, ensuring ready availability for both prototyping and volume production needs.