ISL95870HRUZ-T

Special Purpose Regulators Overview

The ISL95870HRUZ-T is a single-phase synchronous-buck PWM DC/DC controller utilizing Intersil’s proprietary R4 Technology. It operates with an input voltage range of 3.3V to 25V and provides an output voltage range of 500mV to 5V. The device supports selectable switching frequencies of 300kHz, 500kHz, 600kHz, or 1MHz in continuous conduction mode. It features ±0.5% system accuracy over the operating temperature range of -10°C to +100°C. The component includes automatic diode emulation for efficiency, power-good monitoring, and soft-start capabilities.

Special Purpose Regulators Feature Summary

• Integrates proprietary R4 modulator technology for optimal transient response and accurate frequency control.
• Supports flexible output voltage programmability via simple resistor programming or 2-bit VID inputs.
• Includes differential remote sensing for precise output voltage regulation.
• Features automatic diode emulation mode to maximize efficiency under light-load conditions.

Special Purpose Regulators Applications

• Mobile PC Graphical Processing Unit (GPU) VCC Rail
• Mobile PC I/O Controller Hub (ICH) VCC Rail
• Mobile PC Memory Controller Hub (GMCH) VCC Rail

Special Purpose Regulators Procurement Notes

Verify component authenticity through authorized Renesas distributors due to end-of-life status. Confirm package integrity upon receipt as the unit utilizes UTQFN-16 packaging. Cross-reference datasheet revisions to ensure compatibility with existing design specifications. Validate that the specific suffix matches the required VID configuration variant. Request batch documentation to confirm compliance with historical manufacturing standards.

Special Purpose Regulators Selection Notes

Select this controller for portable systems requiring dynamic voltage scaling via VID inputs. Ensure the application demands a single-phase topology within the specified input and output ranges. Verify that the required switching frequency aligns with available external components. Consider the thermal performance requirements given the compact UTQFN-16 package. Evaluate if the integrated driver capabilities meet the MOSFET gate drive needs of the target design.

Special Purpose Regulators Part Context

This component belongs to the ISL95870 family of PWM controllers designed for portable GPU core-voltage regulators. It represents a transition from previous R3 modulator generations, offering improved transient performance and internal compensation. The series targets low-cost solutions for notebook applications requiring dynamically selected slew-rate controlled output voltages.

Special Purpose Regulators Replacement Considerations

Public confirmed substitute part numbers are not available. The manufacturer has designated this item as obsolete. Designers must evaluate alternative single-phase buck controllers with compatible VID interfaces and similar electrical characteristics for new implementations.