LT1573CS8-2.8#PBF

Overview

The LT1573CS8-2.8#PBF is a low dropout PNP regulator driver from Analog Devices, housed in an 8-lead SOIC package. It provides a fixed output voltage of 2.8V with a tolerance of ±1%. The device operates with input voltages between 2.8V and 10V and supports drive currents up to 250mA for external pass transistors. Key electrical parameters include a reference voltage of 1.265V, quiescent current of 1.7mA, and latch-off threshold of 1.4V. It features latching overload protection and thermal shutdown.

Feature Summary

• Provides precise fixed output voltage regulation with 1% accuracy
• Includes timed latch-off circuitry for overcurrent and thermal fault protection
• Enables fast transient response with minimal bulk output capacitance requirements
• Operates on a single supply with integrated shutdown and reset functionality

Applications

• Microprocessor power supply generation
• High current low dropout regulator circuits
• Battery-powered systems requiring efficient voltage regulation

Procurement Notes

Verify the specific suffix #PBF indicates lead-free and RoHS compliance status before procurement. Confirm that the fixed 2.8V output variant matches the system requirement, as adjustable versions exist within the same family. Ensure the ordering part number corresponds exactly to the CS8 surface mount package specification.

Selection Notes

Select this component when a fixed 2.8V rail is required for driving external PNP pass transistors. Consider the maximum drive current capability relative to the selected pass transistor's beta characteristics. Evaluate the thermal resistance requirements based on the expected power dissipation during normal operation and potential overload conditions.

Part Context

This device belongs to the LT1573 series of low dropout regulator drivers designed to control external high-current PNP transistors. Unlike standard LDOs, it acts as a controller, allowing designers to optimize dropout voltage and transient response by selecting appropriate external components. The series includes adjustable and fixed voltage variants to support various digital logic families.

Replacement Considerations

LT1573CS8-2.8#TRPBF