LTC3851AIUD#PBF

DC DC Switching Controllers Overview

The LTC3851AIUD#PBF is a high-performance synchronous step-down switching regulator controller manufactured by Analog Devices Inc. It drives an all N-channel synchronous power MOSFET stage using a constant frequency current mode architecture. The device supports a phase-lockable switching frequency up to 750 kHz and accepts input voltages ranging from 4 V to 38 V. It provides a single output with adjustable voltage from 800 mV to 5.5 V, capable of delivering up to 25 A. The controller features low quiescent current of 20 uA and operates within a temperature range of -40°C to +125°C.

DC DC Switching Controllers Feature Summary

• Drives all N-channel synchronous power MOSFETs for high efficiency
• Constant frequency current mode architecture with phase-lock capability
• Internal 5V linear regulator for bias supply
• Supports forced CCM, pulse skip, and burst modes

DC DC Switching Controllers Applications

• High efficiency synchronous step-down converters
• Industrial distributed power systems
• Point-of-load regulation for processors and FPGAs
• Telecommunications infrastructure power supplies

DC DC Switching Controllers Procurement Notes

Verify the exact suffix against official Analog Devices documentation to confirm temperature grade and package variant. Ensure the ordering part number matches the specific electrical characteristics required for the design. Cross-reference datasheet revisions to confirm pinout compatibility and feature availability before procurement.

DC DC Switching Controllers Selection Notes

Select this component when designing single-output buck converters requiring wide input voltage ranges and high current capabilities. Consider the 750 kHz maximum switching frequency for balancing efficiency and component size. Evaluate thermal performance requirements given the 25 A output capability and ensure adequate PCB layout for the QFN-16 package.

DC DC Switching Controllers Part Context

This part belongs to the LTC3851A family of synchronous step-down DC/DC controllers. It is designed for applications demanding high efficiency and precise voltage regulation. The device integrates essential control functions while allowing external MOSFET selection for optimized performance based on specific current and thermal constraints.

DC DC Switching Controllers Replacement Considerations

LTC3851AEUD-1#PBF

DC DC Switching Controllers FAQ

What operating modes are supported by the LTC3851AIUD#PBF?

The device supports forced continuous conduction mode (CCM), pulse skip mode, and burst mode operation.

Can the switching frequency be synchronized?

Yes, the constant frequency current mode architecture allows for a phase-lockable frequency up to 750 kHz.