RT8205LZQW

Overview

The RT8205LZQW is a dual step-down switch mode power supply controller designed for notebook computer main power supplies. It features two PWM controllers with adjustable outputs ranging from 2V to 5.5V, alongside fixed 3.3V and 5V linear regulators providing up to 100mA each. The device operates within a wide input voltage range of 6V to 25V. Key electrical parameters include a selectable switching frequency via TONSEL, internal soft-start, and thermal shutdown protection. It utilizes constant on-time control architecture for rapid load step response.

Feature Summary

• Integrates dual adjustable PWM controllers and fixed LDOs for comprehensive logic supply generation
• Features automatic bootstrapping between linear regulators and PWM outputs for high efficiency
• Includes internal sequencing, soft-start, and soft-discharge capabilities to prevent negative voltages

Applications

• Notebook and sub-notebook computers
• 3-cell and 4-cell Li-ion battery-powered devices

Procurement Notes

Verify the specific suffix 'ZQW' against official Richtek documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints and thermal requirements. Confirm end-of-life status or obsolescence notices prior to final design-in decisions.

Selection Notes

Select this component when designing main power rails for portable computing systems requiring both adjustable DC-DC conversion and stable low-current logic supplies. Consider the wide input range suitable for multi-cell battery configurations and the integrated LDOs for simplified bill of materials.

Part Context

This part belongs to the RT8205 family of high-efficiency main power supply controllers. It is specifically engineered for battery-operated applications where power management complexity must be minimized while maintaining high performance and reliability in space-constrained environments.

Replacement Considerations

Consult official cross-reference lists for direct replacements. Verify pinout compatibility and electrical parameter equivalence if substituting with similar controllers from other manufacturers.