LT3845IFE#PBF

Overview

The LT3845IFE#PBF is a high voltage, synchronous current mode step-down controller manufactured by Analog Devices Inc. It operates with an input voltage range of 4V to 60V and supports adjustable output voltages up to 36V. The device features a quiescent current of 120µA during Burst Mode operation and offers an adjustable switching frequency from 100kHz to 500kHz. It is housed in a 16-lead TSSOP package and functions within a temperature range of -55°C to +125°C.

Feature Summary

• Synchronous current mode control architecture for medium to high power applications
• Onboard regulator simplifies biasing requirements directly from the input voltage
• Burst Mode operation reduces quiescent current to maintain efficiency at light loads
• Reverse inductor current inhibit function improves light load efficiency

Applications

• Industrial control systems
• Telecom power supplies
• Distributed power architectures

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm RoHS compliance status and specific lot traceability upon order placement. Ensure storage conditions adhere to moisture sensitivity level requirements prior to soldering. Review the official datasheet for complete handling and reflow profile specifications.

Selection Notes

Select this controller for designs requiring wide input voltage ranges and high efficiency under varying load conditions. Consider the onboard regulator for simplified biasing networks. Evaluate thermal performance based on the TSSOP package limitations. Verify that the required output current and voltage specifications align with the external MOSFET selection.

Part Context

This component belongs to the LT3845 family of high voltage synchronous buck controllers. It shares architectural similarities with other devices in the series but differs in specific electrical parameters and package configurations. The 'IFE' suffix indicates a specific temperature grade and tube packaging variant within the broader product line.

Replacement Considerations

LT3845EFE#PBF

FAQ

How does the LT3845 handle light load efficiency?

It utilizes Burst Mode operation to reduce quiescent current to 120µA and includes a reverse inductor current inhibit function to support discontinuous operation.

What is the minimum start-up voltage requirement?

While the operating input range starts at 4V, the minimum start-up voltage is specified as 7.5V.