LT1575CS8-2.8#PBF

Overview

The LT1575CS8-2.8#PBF is a fixed-output low dropout regulator controller from Analog Devices, housed in an 8-lead SOIC package. It delivers a precise 2.8V output with ±0.6% tolerance at room temperature and ±1.0% over the operating range. The device operates within a 5.2V to 22V input voltage window and draws approximately 12mA of quiescent current. Designed for high-speed transient response, it drives external N-channel MOSFETs to eliminate bulky output capacitors.

Feature Summary

• Ultrafast transient response capability that eliminates the need for expensive tantalum or bulk electrolytic output capacitors
• Fixed 2.8V output voltage with precision trimming for tight tolerance across temperature ranges
• Integrated multifunction shutdown pin providing latchoff, overvoltage protection, and thermal shutdown capabilities
• High-side sense current limit amplifier with programmable time-out function

Applications

• Pentium processor power supplies
• PowerPC processor supplies
• Microprocessor core voltage regulation (e.g., 5V to 2.8V conversion)
• Low voltage logic supplies
• GTL termination circuits

Procurement Notes

Verify the specific suffix CS8 corresponds to the 8-lead plastic SOIC package variant. Confirm the -2.8 designation ensures the fixed 2.8V output version rather than the adjustable model. Check RoHS compliance status as indicated in official documentation. Ensure the component meets the required industrial temperature range specifications for your application environment.

Selection Notes

Select this part when ultrafast load transient response is critical and bulk output capacitance must be minimized. It requires an external N-channel MOSFET selected based on desired dropout voltage and RDS(ON). Ensure the input voltage remains above the minimum threshold defined by the output voltage plus MOSFET VGS requirements. Verify that the system can accommodate the high-side current sensing resistor or alternative sense-less configuration.

Part Context

This component belongs to the LT1575/LT1577 family of single/dual controller ICs designed for modern microprocessor applications. Unlike traditional linear regulators, these controllers drive external pass transistors to achieve superior bandwidth and line rejection. The LT1575 series specifically offers fixed and adjustable versions to accommodate various core voltage requirements for high-performance processors.

Replacement Considerations

LT1575CN8-2.8#PBF (PDIP package equivalent)