LT3481HDD#TRPBF

Overview

The LT3481HDD#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.6V to 36V and delivers up to 2A of output current. The device integrates a 2.8MHz fixed-frequency oscillator, allowing for the use of small external inductors and capacitors. It features a low quiescent current of 50µA during operation and significantly lower current in shutdown mode. The adjustable output voltage ranges from 0.79V to 20V. Packaged in a thermally enhanced 10-lead DFN (3mm x 3mm) with exposed pad, it supports continuous operation over an extended temperature range.

Feature Summary

• Integrates high-side and low-side power switches for efficient synchronous rectification
• Fixed 2.8MHz switching frequency minimizes external component size
• Low quiescent current enhances efficiency in battery-powered applications
• Internal soft-start limits inrush current during startup

Applications

• Point-of-load regulation for industrial equipment
• Battery-powered portable devices requiring high efficiency
• Automotive electronics systems
• Communication infrastructure power supplies

Procurement Notes

Verify the specific suffix DD indicates the DFN-10 package and TRPBF denotes tape-and-reel packaging. Confirm RoHS compliance status through official Analog Devices documentation. Ensure the operating temperature grade matches system requirements. Cross-reference the manufacturer part number directly with the datasheet to avoid counterfeit components.

Selection Notes

Select this component when input voltages reach up to 36V and space constraints require a compact DFN footprint. The 2.8MHz frequency is suitable for applications prioritizing small passive component sizes over ultra-low EMI. Compare against the LT3480 if a 2.4MHz frequency or different quiescent current profile is preferred. Ensure thermal design accounts for the exposed pad requirement.

Part Context

This part belongs to the LT348x family of micropower switching regulators designed for high-efficiency DC/DC conversion. It shares architectural similarities with the LT3480 but utilizes a higher 2.8MHz switching frequency. The family targets applications demanding small solution sizes and low standby power consumption within automotive and industrial environments.

Replacement Considerations

LT3480HDD#TRPBF offers similar functionality with a 2.4MHz frequency and 70µA quiescent current. LT3684HFD#PBF provides comparable performance with a 2.8MHz frequency but may differ in pinout or thermal characteristics. Verify electrical parameters and package dimensions before substitution.