RT8202AGQW

Overview

The RT8202AGQW is a PWM controller designed for high-efficiency voltage regulation in notebook computers. It steps down high-voltage battery inputs to generate low-voltage supplies for CPU cores, I/O, and chipset RAM. The device supports an input voltage range of 4.5V to 26V and offers an adjustable output range from 0.75V to 3.3V with 1% accuracy. Key electrical specifications include a quick load step response within 100ns and resistor-programmable switching frequency. It features lossless current limiting via low-side RDS(ON) sensing or sense resistors, over/under voltage protection, and a power good indicator.

Feature Summary

• Provides ultra-high efficiency and excellent transient response for stepping down high voltage batteries to low voltage CPU core and chipset supplies.
• Features resistor-programmable current limit using low-side RDS(ON) sense for lossless limiting or sense resistors for high accuracy.
• Delivers quick load step response within 100ns and maintains 1% VOUT accuracy over line and load variations.
• Includes built-in over/under voltage protection, two-step current limit during soft-start, and a power good indicator.

Applications

• Notebook Computers
• CPU Core Supply
• Chipset/RAM Supply

Procurement Notes

Verify the specific suffix AGQW against the manufacturer's official datasheet to confirm pinout and package dimensions. Confirm RoHS compliance status as per the latest Richtek documentation. Check for any product change notices (PCN) regarding component revisions. Ensure the source provides valid traceability for this discontinued or active part number depending on current market availability.

Selection Notes

Select this controller when designing main power supplies for notebook systems requiring high DC output accuracy and fast transient response. It is suitable for applications needing to drive large synchronous-rectifier FETs efficiently. Consider the resistor-programmable frequency and current limit options for customizing the design to specific thermal and performance constraints.

Part Context

The RT8202 series belongs to Richtek's portfolio of high-efficiency main power supply controllers specifically engineered for notebook computer architectures. It addresses the need for stable, low-voltage generation from higher voltage battery sources. The AGQW designation indicates a specific WQFN package variant optimized for surface-mount assembly in compact electronic devices.

Replacement Considerations

Consult the official datasheet cross-reference section for verified substitutes. Similar parts in the family include RT8204A and RT8205 variants. Verify compatibility of control characteristics and package footprint before substitution.

FAQ

How is the current limit configured in the RT8202AGQW?

The current limit is resistor-programmable. It can be set using low-side RDS(ON) sensing for lossless limiting or by using an external sense resistor for high accuracy.

What is the maximum input voltage range for this controller?

The RT8202AGQW supports a battery input voltage range of 4.5V to 26V.