RT8243AZQW

Overview

The RT8243AZQW is a high-efficiency main power supply controller for notebook computers, manufactured by Richtek USA Inc. It utilizes a synchronous buck topology to step down battery voltage for CPU core and chipset supplies. The device features a constant-on-time control scheme with an integrated voltage programming function ranging from 0.675V to 0.9V via digital inputs. It operates within a temperature range of -40°C to +85°C and is housed in a compact 12-WQFN (2x2) package.

Feature Summary

• Provides instant-on response to load transients while maintaining relatively constant switching frequency
• Eliminates the need for external current-sense resistors to reduce cost and enhance efficiency
• Supports driving large synchronous rectifier MOSFETs and enters diode emulation mode at light loads

Applications

• CPU core voltage generation in notebook computers
• Chipset RAM supply stepping down from high voltage batteries
• I/O voltage generation for portable computing systems

Procurement Notes

Verify the specific suffix 'AZQW' against the manufacturer's official datasheet to confirm pinout compatibility and thermal pad configuration. Ensure that the ordering documentation explicitly references the 12-WQFN package variant. Cross-reference the RoHS declaration status with the latest environmental compliance reports provided by Richtek Technology Corporation before finalizing procurement orders.

Selection Notes

Select this component when designing main power rails for notebook platforms requiring high transient response and simplified bill of materials. The integrated voltage programming feature reduces external resistor networks. Consider the synchronous buck architecture for improved efficiency compared to traditional current-mode PWM controllers that require external sense resistors.

Part Context

This part belongs to Richtek's series of high-efficiency main power supply controllers designed specifically for notebook computer architectures. It complements other PMIC solutions like the RT8241 by offering similar constant-on-time control benefits. The family focuses on direct battery-to-core voltage conversion with minimal external component count.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.