LT3845AMPFE#PBF

Overview

The LT3845AMPFE#PBF is a high-voltage synchronous current mode step-down controller manufactured by Analog Devices Inc. It operates with an input voltage range of 4 V to 60 V and supports up to 15 A output current. The device features a programmable switching frequency from 100 kHz to 500 kHz, which can be synchronized up to 600 kHz. It delivers an adjustable output voltage up to 36 V with a quiescent current of 120 uA. The component is housed in a TSSOP-16 package and functions within a temperature range of -55°C to +125°C.

Feature Summary

• High-voltage synchronous buck control architecture
• Adjustable operating frequency with synchronization capability
• Burst Mode operation for improved light-load efficiency

Applications

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

Procurement Notes

Verify the specific suffix PBF for lead-free compliance and tube packaging configuration. Confirm that the AMP grade designation aligns with the required extended temperature specifications (-55°C to +125°C). Ensure the TSSOP-16 package footprint matches the PCB layout requirements. Cross-reference the manufacturer's latest datasheet for any potential product change notices or lifecycle status updates prior to finalizing procurement orders.

Selection Notes

Select this controller for applications requiring wide input voltage ranges up to 60 V. The adjustable frequency allows optimization for EMI performance and component size. Consider the 15 A current capability when sizing external MOSFETs and inductors. The Burst Mode feature is suitable for designs prioritizing efficiency at low load conditions. Verify thermal management strategies for the TSSOP-16 package under maximum load conditions.

Part Context

This component belongs to the LT3845A series of high-voltage synchronous buck controllers. It is designed for medium to high-power applications requiring precise regulation. The part is often evaluated using demonstration boards such as the DC1619A, which supports 12V to 10A outputs from 16V to 60V inputs. The series includes variants like the LT3845EFE#PBF and LT3845MPFE#TR, differing in temperature grades and packaging formats.

Replacement Considerations

LT3845EFE#PBF

FAQ

Can the switching frequency be synchronized to an external clock?

Yes, the operating frequency can be synchronized up to 600 kHz.

What modes of operation are available for efficiency optimization?

The device supports Burst Mode, discontinuous current mode, and continuous current mode.