LT3845EFE#PBF

Overview

The LT3845EFE#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 output voltages up to 36V. The device delivers an output current capability of 15A through a single output channel. It features a programmable switching frequency from 100kHz to 500kHz and can be synchronized up to 600kHz. The quiescent current is specified at 120µA. The component is housed in a 16-pin TSSOP package with exposed pad 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
• Wide 4V to 60V input voltage range supporting high voltage systems
• Programmable switching frequency with synchronization capability up to 600kHz
• Adjustable output voltage up to 36V with integrated soft-start functionality

Applications

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

Procurement Notes

Verify the specific suffix #PBF indicates lead-free RoHS compliance and tube packaging. Confirm the exact operating temperature grade matches the application requirements, as variants exist. Ensure the supplier provides valid traceability documentation for Analog Devices components. Cross-reference the datasheet revision date to ensure compatibility with design specifications. Check for any recent product change notifications regarding pinout or electrical characteristics.

Selection Notes

Select this controller when designing buck converters requiring wide input voltage ranges up to 60V. It is suitable for applications needing adjustable output voltages up to 36V and currents up to 15A. Consider the TSSOP-16 package for space-constrained designs. Evaluate the need for external MOSFETs, as this is a controller rather than an integrated switch. Assess thermal management requirements given the 15A output capability and 125°C maximum junction temperature rating.

Part Context

The LT3845EFE#PBF belongs to the LT3845A series of high voltage synchronous buck controllers. It is part of Analog Devices' portfolio of power management ICs designed for efficiency and performance. The device complements other solutions like the LT8060x series but focuses on higher voltage inputs and external MOSFET configurations. It is often evaluated using demonstration boards such as the DC1619A for circuit validation.

Replacement Considerations

Direct substitutes include LT3845AEFE#PBF and LT3845AMPFE#PBF within the same family. These variants share identical pinouts and core functionalities but may differ in temperature grades or specific electrical tolerances. Verify that any replacement maintains the 4V to 60V input range and 15A output current capabilities required by the design.

FAQ

What is the maximum synchronization frequency for the LT3845EFE#PBF?

The switching frequency can be synchronized up to 600kHz.

Does the LT3845EFE#PBF have an internal power switch?

No, it is a controller that requires external synchronous MOSFETs to handle the output current.