LT3505IDD#TRPBF

Overview

The LT3505IDD#TRPBF is a current mode PWM step-down DC/DC converter manufactured by Analog Devices Inc. It features an internal 1.4A power switch and supports a wide operating input range of 3.6V to 36V, with a maximum rating of 40V. The device delivers up to 1.2A output current and offers resistor-programmable fixed-frequency operation adjustable from 200kHz to 3MHz. Output voltage is adjustable down to 780mV. It includes cycle-by-cycle current limit protection and soft-start functionality. The component operates within a temperature range of -40°C to +125°C and is housed in a thermally enhanced 3mm x 3mm DFN-8 package.

Feature Summary

• Integrates a high-voltage 1.4A power switch for direct regulation from industrial supplies and automotive batteries
• Enables compact design through resistor-programmable switching frequencies up to 3MHz
• Provides low shutdown current below 2µA with output disconnect for battery-powered systems
• Includes cycle-by-cycle current limiting and soft-start to prevent input surge during start-up

Applications

• Regulating power from unregulated wall transformers
• Powering circuits from 24V industrial supplies
• Automotive battery voltage regulation
• General-purpose step-down conversion in space-constrained designs

Procurement Notes

Verify the specific suffix IDD#TRPBF against the official datasheet to confirm the tape and reel packaging configuration and temperature grade. Ensure compatibility with the required switching frequency programming resistors. Confirm that the 3mm x 3mm DFN-8 footprint matches the target PCB layout. Validate thermal requirements for the intended application environment.

Selection Notes

Select this component when a wide input voltage range up to 36V is required alongside moderate output current capabilities. It is suitable for applications prioritizing small external component size due to high-frequency operation options. Consider the non-synchronous topology for cost-sensitive designs where peak efficiency at light loads is less critical than simplicity.

Part Context

This part belongs to the LT3505 series of step-down switching regulators from Analog Devices. It is designed for applications requiring robust performance from high-voltage sources. The series emphasizes ease of use with minimal external components and integrated protection features, targeting industrial and automotive environments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.