LT3503EDCB#TRMPBF

Overview

The LT3503EDCB#TRMPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.6V to 20V and provides a single adjustable output up to 1A. The device integrates a 2.2MHz fixed-frequency oscillator for compact passive component selection. Key electrical parameters include a maximum quiescent current of 1.9mA, a shutdown supply current of 1µA, and a thermal shutdown threshold at approximately 150°C. It utilizes a DFN-6 package suitable for surface-mount applications.

Feature Summary

• Integrates high-side and low-side N-channel power switches for efficient synchronous rectification
• Features constant frequency operation with internal compensation to minimize external component count
• Includes programmable soft-start capability to limit inrush current during startup
• Provides thermal shutdown protection to safeguard the device under overload conditions

Applications

• Portable battery-powered equipment requiring efficient voltage regulation
• Industrial control systems with 5V or 12V bus architectures
• Embedded systems utilizing microprocessors or DSPs needing stable core voltages
• Communication infrastructure powering RF modules and logic circuits

Procurement Notes

Verify the specific suffix TRMPBF indicates tape and reel packaging when ordering. Confirm the E-grade temperature rating aligns with your operational environment requirements. Ensure the DFN-6 footprint matches your PCB layout guidelines. Cross-reference the datasheet revision date to confirm compatibility with your design specifications before finalizing procurement.

Selection Notes

Select this component when a compact solution is required for stepping down higher voltages to lower levels efficiently. The integrated power switches eliminate the need for external Schottky diodes, reducing board space. Consider the 2.2MHz switching frequency for smaller inductor sizes compared to lower frequency alternatives. Evaluate the load current requirements against the 1A continuous output capability to ensure adequate thermal performance.

Part Context

This part belongs to the LT3503 family of micropower synchronous buck converters designed for space-constrained applications. It shares architectural similarities with other LT350x series devices but offers specific input voltage ranges and switching frequencies tailored for general-purpose DC/DC conversion needs in portable and industrial electronics.

Replacement Considerations

LT3503EDCB#PBF: Identical electrical specifications but supplied in tube packaging instead of tape and reel.