RT6228CGQUF

Overview

The RT6228CGQUF is a synchronous step-down converter with an integrated LDO, manufactured by Richtek USA Inc. It operates from a 5.1V to 23V input voltage range and delivers up to 8A output current. The switching frequency is fixed at 750kHz. The buck converter provides a fixed 5.1V output, while the LDO provides a fixed 3.3V output at 100mA. It utilizes ACOT mode for fast transient response and features low on-resistance internal power MOSFETs. The device is housed in a 12-UQFN-HL package.

Feature Summary

• Advanced Constant On-Time (ACOT) mode control architecture enables fast transient response and allows the use of all MLCC output capacitors.
• Integrated dual-output topology combines an 8A synchronous buck converter with a 100mA low-dropout linear regulator (LDO).
• High-efficiency internal power MOSFETs feature low on-resistance values to minimize conduction losses.
• Fixed 750kHz switching frequency optimizes component size and dynamic performance.

Applications

• Powering system-on-chip (SoC) components requiring multiple voltage rails
• Industrial control systems and automation equipment
• Consumer electronics and smart home devices
• Communication and enterprise infrastructure

Procurement Notes

Verify the specific suffix 'CGQUF' to ensure the correct output configuration: a fixed 5.1V buck output and a fixed 3.3V LDO output. Confirm that the 5.1V minimum input voltage requirement aligns with your system's supply rail, as this variant differs from the adjustable input versions. Check the datasheet for thermal pad requirements and soldering profiles suitable for the UQFN-HL package to ensure reliable assembly and long-term operational stability.

Selection Notes

Select the RT6228CGQUF when a fixed 5.1V high-current rail and a separate 3.3V auxiliary rail are needed from a single IC. This model is distinct from the RT6228AGQUF, which offers an adjustable buck output. Ensure your application input voltage remains above 5.1V to maintain proper regulation. Consider the 750kHz frequency for smaller passive components compared to lower-frequency alternatives, balancing efficiency with electromagnetic interference considerations.

Part Context

This component belongs to the RT6228 family of advanced synchronous step-down converters. The family includes variants with different output configurations, such as adjustable or fixed voltages. The RT6228 series is designed for applications requiring high efficiency and compact solutions, leveraging Richtek's proprietary ACOT technology to simplify design and improve dynamic performance across various industrial and consumer platforms.

Replacement Considerations

RT6228BGQUF

FAQ

What is the difference between the RT6228CGQUF and the RT6228AGQUF?

The RT6228CGQUF provides a fixed 5.1V output from the buck converter and a fixed 3.3V output from the LDO. In contrast, the RT6228AGQUF features an adjustable buck output voltage ranging from 0.6V to 5.1V, along with a 3.3V LDO.

Does the RT6228CGQUF support all MLCC output capacitors?

Yes, the device utilizes Advanced Constant On-Time (ACOT) mode control, which eliminates the need for ESR-dependent compensation and allows the use of all MLCC output capacitors.