LT3991IDD#PBF

Overview

The LT3991IDD#PBF is a synchronous step-down switching regulator IC manufactured by Analog Devices Inc. It operates with an input voltage range of 4.3V to 55V and delivers up to 1.2A of output current. The device features an adjustable output voltage from 1.19V to 30V. It supports a programmable switching frequency between 200kHz and 2MHz. The component is housed in a 10-WFDFN package with an exposed pad, suitable for surface mount installation.

Feature Summary

• Synchronous buck topology for high efficiency
• Wide input voltage capability up to 55V
• Programmable switching frequency for optimization
• Adjustable output voltage regulation

Applications

• Industrial control systems
• Telecommunications infrastructure
• Point-of-load regulation modules

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS standards. Confirm the 10-WFDFN package dimensions match the design footprint. Ensure the operating temperature range meets system requirements. Check for any recent PCN updates regarding manufacturing site changes or material declarations before finalizing procurement.

Selection Notes

Select this component when a wide input voltage range exceeding standard 36V limits is required. The adjustable output allows flexibility for various load requirements. Consider the thermal performance of the exposed pad DFN package for heat dissipation needs. Verify that the external component selection supports the desired switching frequency and output ripple specifications.

Part Context

This part belongs to the LT3991 family of high voltage synchronous buck regulators. It is designed for applications requiring robust power conversion from higher voltage rails. The device integrates internal switches to minimize external component count compared to non-synchronous alternatives.

Replacement Considerations

LT3971IDD-5#PBF offers similar functionality but with a lower maximum input voltage of 38V.