LT1171IT#PBF

Overview

The LT1171IT#PBF is a monolithic high-power switching regulator from Analog Devices Inc. It supports multiple standard topologies including buck, boost, flyback, forward, inverting, and Cuk configurations. The device integrates a high-current, high-efficiency power switch with complete oscillator, control, and protection circuitry on the die. It operates with an input voltage range of 3V to 60V and delivers up to 2.5A output current. The maximum output power capability is rated at 100W. The unit is housed in a 5-pin TO-220 package with a tab for thermal management.

Feature Summary

• Integrates a high-current, high-efficiency power switch with all necessary oscillator, control, and protection circuitry on a single die.
• Supports versatile operation across all standard switching configurations, including buck, boost, flyback, forward, inverting, and Cuk topologies.
• Designed for high-power applications with integrated thermal dissipation capabilities via the TO-220 package.

Applications

• LCD contrast power supplies
• Positive-to-negative buck-boost converters
• Negative boost regulators

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the TO-220-5 package type matches your thermal design requirements. Ensure the 3V to 60V input range aligns with your system's supply voltage. Check that the 2.5A switch current rating meets your peak load demands. Validate the 100W power limit against your application's total power budget.

Selection Notes

Select this component for designs requiring a single-chip solution for various DC-DC conversion topologies. It is suitable for applications needing up to 100W of power with a wide input voltage range. Consider the TO-220 package for through-hole mounting and heat dissipation needs. Evaluate the internal switch current limit of 2.5A against your maximum load requirements.

Part Context

The LT1171 series belongs to Analog Devices' family of monolithic high-power switching regulators. It shares architectural similarities with the LT1170, which offers higher current capacity. The IT variant specifies the industrial temperature range. The #PBF designation confirms the component is manufactured without halogenated flame retardants and complies with RoHS standards.

Replacement Considerations

LT1171HVIT#PBF: Higher voltage variant supporting up to 75V switch voltage.

FAQ

What switching topologies does the LT1171IT support?

It supports buck, boost, flyback, forward, inverting, and Cuk configurations.

Is the LT1171IT synchronous?

No, the LT1171IT does not feature synchronous rectification.