SC1189SWTRT

Overview

The SC1189SWTRT is a programmable synchronous DC/DC converter and dual LDO controller designed for advanced microprocessor power supplies. It integrates a synchronous voltage mode controller with two low-dropout linear regulators to implement three DC/DC converters. The device supports output voltages from 1.050V to 1.825V, featuring a 5-bit DAC for programmability. It achieves 95% efficiency in the switching section and offers 1.0% accuracy between 1.6V and 1.8V. The component includes short-circuit protection for the 1.25V and 2.5V linear controllers and provides an on-chip power good signal.

Feature Summary

• Integrates a synchronous voltage mode controller with two low-dropout linear regulators for triple DC/DC conversion
• Features a 5-bit digital-to-analog converter for precise output voltage programmability
• Includes short-circuit protection for linear regulator outputs and an integrated power good signal

Applications

• Pentium III microprocessor power supply systems
• Programmable triple power supply implementations
• Microprocessor core voltage regulation requiring VRM 8.4 and 8.5 compliance

Procurement Notes

Verify the specific suffix SWTRT against manufacturer documentation to confirm package type and reel quantity specifications. Ensure compatibility with Intel Pentium III requirements if targeting legacy applications. Confirm RoHS and WEEE compliance status through official datasheets prior to integration into final designs.

Selection Notes

Select this component when designing power architectures for high-performance processors requiring synchronized switching and linear regulation. The integrated design reduces external component count and eliminates the need for heatsinks due to high efficiency. Consider the 5-bit DAC resolution for fine-tuning voltage rails within the specified operating range.

Part Context

The SC1189 belongs to Semtech's portfolio of power management ICs tailored for CPU core voltage regulation. It addresses the specific transient response and accuracy demands of early 2000s microprocessors. The combination of switching and LDO technologies allows for optimized performance across varying load conditions while maintaining strict voltage tolerance standards.

Replacement Considerations

SC1189SWTR and SC1189 are functionally equivalent variants within the same family. Verify pin-out compatibility and thermal characteristics when substituting these parts. No alternative part numbers are confirmed as direct replacements in public documentation.