LT1575CN8#PBF

Voltage Regulators - Linear Regulator Controllers Overview

The LT1575CN8#PBF is an ultrafast transient response, low dropout regulator controller IC manufactured by Analog Devices Inc. It drives external N-channel MOSFETs as source followers to achieve high-speed load regulation without requiring bulky tantalum or electrolytic output capacitors. The device features a precision-trimmed 1.21V reference with ±0.6% tolerance at room temperature and ±1% over the operating temperature range. It includes a multifunction shutdown pin for latchoff protection, high-side current sensing via IPOS/INEG terminals, and operates within a junction temperature range of 0°C to 100°C.

Voltage Regulators - Linear Regulator Controllers Feature Summary

• Ultrafast transient response capability eliminates the need for expensive bulk output capacitors in demanding microprocessor applications.
• Multifunction shutdown pin provides programmable current limit time-out with latchoff, overvoltage protection, and thermal shutdown functionality.
• High-side sense current limit amplifier activates fault protection using an external shunt resistor connected between IPOS and INEG pins.
• Precision-trimmed adjustable and fixed output voltage versions accommodate various required microprocessor power supply voltages.

Voltage Regulators - Linear Regulator Controllers Applications

• Pentium processor supplies
• PowerPC supplies
• 5V to 3.XXV or 3.3V to 2.XXV microprocessor supplies
• GTL termination
• Low voltage logic supplies

Voltage Regulators - Linear Regulator Controllers Procurement Notes

Verify the specific package type upon ordering, as the CN8 suffix denotes an 8-lead PDIP package while CS8 indicates surface mount. Confirm that the selected version matches the required output voltage configuration, whether adjustable or fixed. Ensure the external N-channel MOSFET selection aligns with the specified dropout voltage requirements and gate drive characteristics defined in the datasheet.

Voltage Regulators - Linear Regulator Controllers Selection Notes

Select the LT1575CN8#PBF when system design requires eliminating bulk output capacitance to save board space and cost. This component is suitable for applications driving modern microprocessors with rapid load transients. Designers must choose an appropriate external N-channel MOSFET to define the dropout voltage and ensure the feedback network meets the desired output voltage specifications.

Voltage Regulators - Linear Regulator Controllers Part Context

This component belongs to the LT1575/LT1577 family of single/dual controller ICs designed for ultrafast transient response regulators. While the LT1575 is a single channel device available in 8-pin packages, the LT1577 offers dual channels in a 16-pin narrow body SO package. Both families share similar control architectures for driving external pass elements.

Voltage Regulators - Linear Regulator Controllers Replacement Considerations

Consult the factory for additional output voltage combinations or industrial/military grade parts. No direct public substitute part numbers are confirmed in the provided documentation.