The LTC3521EUF from Linear Technology is a versatile, multi-channel power management integrated circuit (PMIC) designed for portable power applications. This compact and efficient device integrates two high voltage 2.25MHz step-down DC/DC converters and a full-featured Li-Ion/Polymer battery charger, making it an ideal choice for a wide range of portable devices such as handheld instruments, medical devices, and personal media players.

Key Features

• High-Efficiency Synchronous Operation: The LTC3521EUF operates with a 2.25MHz switching frequency, which allows the use of small, low-cost capacitors and inductors while maintaining high efficiency.
• Dual Step-Down Converters: The device includes two independent step-down converters capable of delivering up to 600mA of continuous output current each, with a wide input voltage range of 2.5V to 5.5V.
• Integrated Battery Charger: The LTC3521EUF features a complete constant-current/constant-voltage linear charger for single-cell Li-Ion/Polymer batteries with a programmable charge current up to 950mA.
• Thermal Regulation: To maximize the charge rate without risking overheating, the LTC3521EUF includes thermal regulation that reduces charge current if an internal temperature threshold is exceeded.
• PowerPath Control: The device provides seamless PowerPath control, enabling the system to be powered from the battery or the input source, which reduces battery charging/discharging cycles and extends battery life.
• Multiple Safety Features: It includes safety features such as overvoltage protection, thermal shutdown, and current limiting to ensure reliable operation under various conditions.

Package and Availability

The LTC3521EUF is available in a compact, 24-lead QFN package (4mm x 5mm) which is suitable for space-constrained applications. The device operates over a temperature range of -40°C to 85°C, catering to a broad spectrum of environmental conditions.

Conclusion

With its high efficiency, multiple power outputs, integrated battery charging capability, and comprehensive protection features, the LTC3521EUF from Linear Technology stands out as a powerful solution for modern portable power management needs. Its compact size and high level of integration make it an excellent choice for designers looking to maximize performance while minimizing the footprint of their power management systems.