LT1573CS8-2.5#TRPBF

Overview

The LT1573CS8-2.5#TRPBF is a low dropout PNP regulator driver manufactured by Analog Devices Inc., housed in an 8-lead SOIC surface mount package. It provides a fixed output voltage of 2.5V with a maximum drive current capability of 250mA to external PNP pass transistors. The device operates within an input voltage range of 2.8V to 10V and supports junction temperatures from 0°C to 125°C. Key electrical specifications include a reference voltage of 1.265V, quiescent current of 1.7mA, and latch-off threshold of 1.4V.

Feature Summary

• Integrated timed latch-off circuit for overcurrent protection that minimizes heat sink requirements
• Fast transient response capability allowing reduced bulk output capacitance
• Single supply operation compatible with microprocessor power supplies
• Precision internal feedback reference ensuring accurate output regulation

Applications

• Microprocessor power supply circuits requiring high current and low dropout
• Low cost solutions for high current linear regulators
• Systems needing fast load transient response with minimal output capacitors

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the CS8 variant corresponds to the commercial temperature grade (0°C to 125°C) rather than the industrial IS8 version. Ensure the fixed 2.5V output configuration matches the design requirement instead of the adjustable FB pin version.

Selection Notes

Select this component when designing regulators using external PNP transistors like the D45H11. The fixed 2.5V output eliminates the need for external feedback resistors compared to the adjustable version. Consider the thermal resistance characteristics of the SOIC-8 package and the required drive current resistor RD for proper latch-off timing and transistor base limiting.

Part Context

This part belongs to the LT1573 family of low dropout regulator drivers designed to control external PNP pass elements. Unlike integrated LDOs, this driver requires an external power transistor to handle high currents up to 5A or more. The series focuses on providing precise error amplification and robust protection features for discrete regulator topologies.

Replacement Considerations

LT1573IS8-2.5#PBF: Industrial temperature grade equivalent in tube packaging.