LTC3541EDD-3#TRPBF

Overview

The LTC3541EDD-3#TRPBF is a high-efficiency synchronous buck converter paired 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 2.25 MHz switching frequency, enabling the use of small surface-mount inductors and capacitors. It provides two regulated outputs: the buck converter offers selectable voltages of 1.575 V or 1.8 V, while the VLDO provides 1.8 V. Quiescent current is specified at 285 uA. The component is housed in a compact DFN-10 package and supports operation temperatures from -40°C to +85°C.

Feature Summary

• Integrates a high-efficiency synchronous buck converter with a dedicated VLDO regulator for dual-output power management.
• Utilizes a fixed 2.25 MHz switching frequency to minimize external passive component size.
• Includes a shutdown pin for power conservation during inactive periods.

Applications

• Portable battery-powered devices requiring efficient step-down conversion
• Embedded systems utilizing single-cell lithium-ion or lithium-polymer batteries
• Applications necessitating simultaneous generation of multiple logic supply rails

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing. Confirm availability status as distribution channels may report limited stock or discontinuation. Ensure the DFN-10 footprint matches your PCB layout requirements. Cross-reference the manufacturer's latest datasheet for any updates regarding environmental compliance or pinout definitions prior to final procurement.

Selection Notes

Select this component when space constraints require a combined buck and LDO solution in a minimal footprint. The fixed 2.25 MHz frequency is optimal for reducing inductor size compared to lower-frequency alternatives. Verify that the required output voltages align with the available factory-set options for the -3 variant. Consider thermal performance within the DFN-10 package if operating near maximum load currents.

Part Context

This part belongs to the LTC3541 series of mixed-signal power management ICs designed for portable electronics. It combines the efficiency of a synchronous buck topology with the noise rejection of a linear regulator. The -3 suffix denotes specific factory-programmed output voltages. It serves as a compact power solution for applications where board area is critical and multiple voltage rails are needed from a single source.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult Analog Devices technical support for direct replacements or evaluate other members of the LTC354x family based on specific voltage and current requirements.