LT1374CFE#PBF

Overview

The LT1374CFE#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc. It operates with a constant 500kHz switching frequency and integrates a high-power switch capable of delivering up to 4.5A. The device accepts an input voltage range from 5V to 25V and provides an adjustable output voltage. It features a low operating supply current of 2.5mA and a shutdown current of 20µA. The component utilizes current-mode control for rapid transient response and includes cycle-by-cycle current limiting. It is housed in a 16-lead TSSOP package with an exposed pad for thermal dissipation.

Feature Summary

• Integrates a 4.5A power switch with a saturated design to minimize inductor size requirements.
• Operates at a fixed 500kHz switching frequency, enabling the use of all surface-mount components.
• Features current-mode control architecture for fast line and load transient response.
• Includes a shutdown pin that reduces quiescent current to 20µA for battery conservation.

Applications

• Point-of-load regulation for microprocessors and DSPs
• Battery-powered systems requiring efficient step-down conversion
• Industrial control systems with 5V to 25V input rails
• Communication equipment power distribution networks

Procurement Notes

Verify the specific suffix CFEPBF against the manufacturer's official datasheet to confirm the commercial temperature grade and lead-free status. Ensure the ordering part number matches the exact package variant required for your PCB footprint. Cross-reference the manufacturer's latest documentation to confirm availability and any recent product change notices affecting this specific part number.

Selection Notes

Select this component when a compact solution is needed for high-current applications without external pass transistors. The integrated 4.5A switch allows for smaller passive components compared to lower-current regulators. Consider the 16-pin TSSOP package for its thermal performance and ease of assembly. Verify that the input voltage range aligns with your system's power source before finalizing the design.

Part Context

This part belongs to the LT1374 family of high-efficiency step-down switching regulators. The series is designed to replace linear regulators in applications where efficiency and thermal management are critical. The LT1374CFE#PBF specifically denotes the commercial temperature range version in the TSSOP-16 package, offering a balance between performance and cost for general-purpose power management tasks.

Replacement Considerations

Consult the manufacturer's official replacement guide for verified substitutes. Direct replacements must match the 4.5A current rating, 500kHz frequency, and TSSOP-16 package. Verify pin compatibility and thermal characteristics before substitution.

FAQ

What is the maximum switch current capability of the LT1374CFE#PBF?

The device integrates a power switch capable of delivering up to 4.5A of continuous output current.

How does the LT1374CFE#PBF handle overcurrent conditions?

It employs cycle-by-cycle current limiting to protect the internal switch and inductor during overload or short-circuit events.

Can the switching frequency be adjusted externally?

No, the LT1374CFE#PBF operates at a fixed constant switching frequency of 500kHz.