LTC3541EDD-1#PBF

Overview

The LTC3541EDD-1#PBF is a high-efficiency synchronous step-down DC/DC converter paired with a very low dropout (VLDO) linear regulator, manufactured by Analog Devices Inc. The device operates from an input voltage range of 2.7 V to 5.5 V and features a buck converter capable of delivering up to 500 mA of output current. The integrated VLDO provides an additional 300 mA output. The switching frequency is fixed at 2.25 MHz, allowing for the use of small surface-mount inductors and capacitors. The part is housed in a 10-lead DFN package and supports shutdown functionality with a quiescent current of 285 µA.

Feature Summary

• Integrates a high-efficiency synchronous buck converter and a separate VLDO regulator within a single compact package.
• Supports operation over a wide input voltage range suitable for battery-powered applications.
• Features a fixed 2.25 MHz switching frequency to minimize external component size.
• Includes a shutdown pin to reduce power consumption during inactive periods.

Applications

• Battery-powered handheld devices
• Portable consumer electronics
• Embedded systems requiring multiple voltage rails

Procurement Notes

Verify the specific suffix and tape/reel or tube packaging configuration required for your assembly process. Confirm that the 10-lead DFN footprint matches your PCB layout constraints. Ensure compatibility with the 2.7 V to 5.5 V input supply range for your target application environment before finalizing procurement.

Selection Notes

Select this component when space-constrained designs require both a high-current switching regulator and a low-noise LDO. The 500 mA buck output suits moderate load requirements, while the 300 mA VLDO handles sensitive analog circuits. Consider the 2.25 MHz frequency trade-off between efficiency and EMI filtering needs compared to lower-frequency alternatives.

Part Context

This part belongs to the LTC3541 series of dual-output power management ICs. It combines switching regulation with linear regulation to simplify board design. The DFN-10 package offers thermal performance advantages over larger QFN options while maintaining a small footprint for portable applications.

Replacement Considerations

Direct functional substitutes include other Analog Devices dual-output PMICs such as the LTC3541EDD-3#PBF for different fixed output voltages. Cross-family replacements may require schematic redesign due to varying pinouts or control interfaces.