LT1956IFE-5#PBF

Overview

The LT1956IFE-5#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., designed for high-voltage applications with an input voltage range of 5.5 V to 60 V. It features a fixed 5 V output and supports up to 1.2 A continuous output current, operating at a 500 kHz switching frequency. The device integrates a high-efficiency 1.5 A power switch, oscillator, and control logic within a 16-pin TSSOP package with exposed pad. It operates from -40 °C to +125 °C, draws 25 µA quiescent current, and includes shutdown functionality.

Feature Summary

• Integrates a high-efficiency 1.5 A internal power switch with complete oscillator and control circuitry
• Utilizes current mode architecture to ensure fast transient response and stable loop performance
• Supports wide input voltage ranges suitable for industrial and automotive bus architectures
• Includes dedicated shutdown pin for precise power management and system sleep modes

Applications

• Industrial power supply systems requiring isolated or non-isolated step-down conversion
• Automotive electronics operating on 12V or 24V nominal bus architectures
• Distributed power distribution networks in telecommunications equipment
• Battery-powered devices requiring efficient voltage regulation from higher source voltages

Procurement Notes

Verify the specific suffix #PBF indicates lead-free RoHS compliance when sourcing. Confirm the IFE package variant matches your PCB footprint requirements. Check manufacturer lifecycle status as availability may be limited. Ensure thermal design accounts for the exposed pad in the TSSOP-EP package. Validate input voltage does not exceed the 60 V maximum rating during transients.

Selection Notes

Select this component for designs needing high input voltage capability without external MOSFETs. The 500 kHz frequency allows for smaller passive components compared to lower frequency regulators. Consider the 1.2 A output limit against peak load requirements. The exposed pad package requires careful thermal management on the PCB ground plane. Verify compatibility with downstream loads requiring a fixed 5 V rail.

Part Context

This part belongs to the LT1956 family of high-voltage buck regulators. It shares architectural similarities with other LT series power management ICs but is distinct in its 60 V input rating and integrated 1.5 A switch. The IFE-5 variant specifically denotes the 5 V fixed output configuration in the TSSOP-EP package format used by Analog Devices.

Replacement Considerations

LT1956EGN-5#TRPBF (Same function, Tape & Reel packaging)

FAQ

What is the maximum input voltage supported by the LT1956IFE-5#PBF?

The device supports a maximum input voltage of 60 V.

Does the LT1956IFE-5#PBF include an internal power switch?

Yes, it integrates a high-efficiency 1.5 A power switch on the die.

What is the operating temperature range for this regulator?

The specified operating temperature range is from -40 °C to +125 °C.