LTC3553EUD-2#PBF

Power Management - Specialized Overview

The LTC3553EUD-2#PBF is a micropower USB power manager integrated circuit designed for battery management applications. It features a Li-ion charger, two step-down DC/DC regulators, and an always-on LDO. The device operates with an input voltage range of 4.35 V to 5.5 V. It provides regulated outputs including a 3.35 V fixed output from the LDO and adjustable buck converters. The component is housed in a 20-pin QFN package.

Power Management - Specialized Feature Summary

• Integrates a switching Li-ion/Li-Pol battery charger with 500mA current capability
• Includes two synchronous step-down DC/DC converters for efficient voltage regulation
• Features an always-on low dropout (LDO) regulator for continuous power supply

Power Management - Specialized Applications

• USB-powered portable electronic devices
• Battery management systems for mobile equipment
• Micropower application circuits requiring multiple regulated rails

Power Management - Specialized Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when reviewing distributor catalogs. Confirm that the part number matches the exact Analog Devices specification sheet for the LTC3553 series. Ensure compatibility with the intended PCB footprint and thermal requirements before finalizing procurement orders.

Power Management - Specialized Selection Notes

Select this component when designing systems powered by USB sources that require integrated battery charging and multiple voltage domains. It is suitable for applications needing high efficiency through synchronous buck conversion alongside a dedicated linear regulator. Consider the 20-QFN package constraints for thermal dissipation and layout space.

Power Management - Specialized Part Context

This IC belongs to the LTC3553 family of micropower USB power managers. It is distinct from similar models like the LTC3554 or LTC3557 which may offer different pin counts or regulator configurations. The device serves as a comprehensive power solution for compact, battery-operated electronics requiring USB connectivity.

Power Management - Specialized Replacement Considerations

Potential substitutes include the LTC3554EUD-2#PBF and LTC3553EUD-2#TRPBF. Verify functional equivalence regarding regulator topology and pinout compatibility before substitution.