LTC3541EDD#TRPBF

Overview

The LTC3541EDD#TRPBF is a high-efficiency synchronous buck converter integrated with a very low dropout (VLDO) regulator, manufactured by Analog Devices Inc. It operates within an input voltage range of 2.7 V to 5.5 V and delivers up to 500 mA from the buck output and 300 mA from the VLDO. The device features a fixed switching frequency of 2.25 MHz, enabling the use of compact surface-mount inductors and capacitors. It is housed in a 10-lead DFN package and supports shutdown functionality with a typical quiescent current of 285 µA.

Feature Summary

• Integrates a high-efficiency synchronous buck converter and a separate VLDO regulator for dual-output power management.
• Operates at a fixed 2.25 MHz switching frequency to minimize external component size.
• Includes shutdown control to reduce power consumption during inactive periods.

Applications

• Portable battery-powered equipment requiring efficient dual-rail power distribution
• Cellular phones and wireless communication modules
• Personal digital assistants (PDAs)
• Handheld computing devices

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the part number corresponds to the fixed output voltage variant intended for your design, as other suffixes may denote adjustable or different fixed voltages. Ensure compatibility with the 10-lead DFN footprint during PCB layout preparation.

Selection Notes

Select this component when a single IC solution is required to provide both a high-current buck rail and a clean LDO rail from a single input source. It is suitable for designs where board space is limited due to the small passive components allowed by the 2.25 MHz frequency. Consider the thermal performance of the DFN package relative to the expected load current and ambient conditions.

Part Context

This part belongs to the LTC3541 family of dual-output regulators. It shares architectural similarities with other LTC35xx series devices but is distinct in its combination of a 500mA buck and 300mA LDO. Unlike the LTC3542 which offers an adjustable buck output, this model provides fixed outputs optimized for standard logic levels.

Replacement Considerations

Direct substitutes include other parts within the LTC3541 family with compatible pinouts and electrical characteristics. Verify that any replacement maintains the same output voltage configuration and current capabilities to ensure circuit compatibility without redesign.