LT1171HVCT#PBF

Overview

The LT1171HVCT#PBF is a monolithic high-power switching regulator from Analog Devices, designed for versatile DC-DC conversion applications. It integrates a high-current, high-efficiency internal switch with complete oscillator, control, and protection circuitry on a single die. The device supports multiple standard switching topologies including buck, boost, flyback, forward, inverting, and Cuk configurations. It operates with an input voltage range of 3V to 60V and provides a maximum output current of 2.5A. With a fixed switching frequency of 100kHz, it delivers up to 100W of output power. The component is housed in a TO-263 (DDPAK-5) package suitable for surface-mount installation.

Feature Summary

• Integrates a high-current, high-efficiency power switch with all necessary oscillator, control, and protection circuitry on a single monolithic die.
• Supports operation in all standard switching configurations, including buck, boost, flyback, forward, inverting, and Cuk topologies.
• Features a fixed 100kHz switching frequency to optimize external component size and system performance.

Applications

• Driving high-voltage FETs in off-line power supply applications
• High-efficiency step-down (buck) converter designs
• Step-up (boost) converter circuits
• Flyback converter implementations

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the HV variant designation matches the required input voltage range specifications for your design. Ensure the TO-263 package footprint aligns with your PCB layout requirements. Cross-reference the manufacturer's latest datasheet for any updates regarding thermal characteristics or pinout definitions before finalizing procurement.

Selection Notes

Select this component when a robust, single-chip solution is needed for high-power DC-DC conversion across various topologies. The integrated switch eliminates the need for external power transistors, simplifying the design. Consider the 2.5A current limit and 60V input rating to ensure adequate headroom for your specific application loads and input voltage variations.

Part Context

This part belongs to the LT1170/LT1171 family of high-power switching regulators. While similar to the LT1170, the LT1171 variant typically offers different current handling capabilities, specifically rated for 2.5A output compared to the 5A rating found in other family members. The HV suffix denotes a high-voltage version capable of handling higher input voltages within the specified range.

Replacement Considerations

LT1170HVCT#PBF is a related high-current variant within the same family but differs in output current capacity.