LT1171CQ#PBF

Overview

The LT1171CQ#PBF is a monolithic high-power switching regulator manufactured by Analog Devices Inc. It supports multiple DC-DC topologies including buck, boost, Cuk, flyback, and forward converters. The device features an adjustable output voltage starting at 1.244V with a maximum switch voltage rating of 65V. It delivers a continuous switch current of 2.5A and operates from an input voltage range of 3V to 40V. The unit functions at a fixed switching frequency of 100kHz and includes internal oscillator, control, and protection circuitry. It is housed in a TO-263-6 (D2PAK) surface-mount package and operates within a junction temperature range of 0°C to 100°C.

Feature Summary

• Supports versatile DC-DC conversion topologies such as buck, boost, flyback, forward, and Cuk configurations.
• Integrates a high-current, high-efficiency power switch with complete oscillator and control logic on a single die.
• Provides adjustable output voltage regulation with internal current limiting and protection mechanisms.

Applications

• LCD contrast power supplies
• Driving high-voltage FETs for off-line applications
• External current limiter circuits

Procurement Notes

Verify the specific suffix and tape/reel or tube packaging configuration against the official datasheet before ordering. Confirm that the thermal performance requirements of the D2PAK package align with the target application's heat dissipation needs. Ensure the input voltage does not exceed the specified limits for the standard LT1171 variant compared to the HVC version.

Selection Notes

Select this component when a single IC must support multiple converter topologies without external controller complexity. It is suitable for designs requiring up to 2.5A switch current with adjustable output voltages. Consider the TO-263 package for adequate thermal management in medium-power applications. Verify compatibility with the required operating temperature range for industrial environments.

Part Context

This part belongs to the LT1171 family of high-power switching regulators. It shares core architecture with variants like the LT1171IQ and LT1171HVCQ but differs in temperature grade and voltage ratings. The LT1171 series is designed to replace discrete solutions by integrating the power switch and control loop into one package.

Replacement Considerations

LT1171IQ#PBF is a parameter-equivalent alternative within the same family.