LT1575CS8#PBF

Voltage Regulators - Linear Regulator Controllers Overview

The LT1575CS8#PBF is a single-channel low dropout regulator controller from Analog Devices, packaged in an 8-lead SOIC. It drives external N-channel MOSFETs to achieve ultrafast transient response and low dropout voltage. The device features a precision 1.21V reference with ±0.6% tolerance at room temperature and ±1% over the operating range. It operates within a supply voltage of 5V to 20V and supports a quiescent current of approximately 12mA. The controller includes high-side current sensing and a multifunction shutdown pin for protection.

Voltage Regulators - Linear Regulator Controllers Feature Summary

• Ultrafast transient response capability that eliminates the need for bulky tantalum or electrolytic output capacitors
• Low dropout voltage performance determined by the external N-channel MOSFET RDS(ON)
• Integrated high-side sense current limit amplifier with programmable time-out latchoff
• Multifunction shutdown pin providing overvoltage protection, thermal shutdown, and latchoff control

Voltage Regulators - Linear Regulator Controllers Applications

• Pentium processor supplies
• PowerPC supplies
• Microprocessor core supplies stepping down from 5V to 3.3V or lower
• GTL termination circuits
• Low voltage logic supplies

Voltage Regulators - Linear Regulator Controllers Procurement Notes

Verify the specific suffix CS8 corresponds to the 8-lead plastic SO package and PBF indicates lead-free compliance. Confirm the fixed output voltage variant matches the required system rail, as the base model number requires a voltage-specific suffix. Ensure the external MOSFET selection aligns with the controller's gate drive capabilities and threshold requirements for optimal dropout performance.

Voltage Regulators - Linear Regulator Controllers Selection Notes

Select this component when application demands require microsecond-level transient recovery without bulk output capacitance. The design necessitates an external N-channel MOSFET; choose one with sufficient gate charge handling and low RDS(ON) to minimize dropout. Verify that the input voltage range accommodates the maximum load conditions and that the PCB layout supports Kelvin sensing for accurate current limiting.

Voltage Regulators - Linear Regulator Controllers Part Context

This part belongs to the LT1575/LT1577 family of UltraFast transient response regulators. While the LT1575 provides a single channel, the LT1577 offers dual channels in a 16-lead package. Both families share the same control architecture designed to replace traditional linear regulators and switching converters in high-performance computing environments where speed and board space are critical constraints.

Voltage Regulators - Linear Regulator Controllers Replacement Considerations

LT1575CS8-5#PBF