RT8228AZQW

$0.25

Description：IC REG CTRLR BUCK 12WQFN
Series：-
Mfr：Richtek USA Inc.
Package：Tape & Reel (TR)

SKU:c7e8999e1857 Category: DC DC Switching Controllers Brand: Richtek USA Inc.

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Product introduction

Product Detailed Parameters

Description：IC REG CTRLR BUCK 12WQFN
Series：-
Mfr：Richtek USA Inc.
Package：Tape & Reel (TR)
Output Type：Transistor Driver
Function：Step-Down
Output Configuration：Positive
Topology：Buck
Number of Outputs：1
Output Phases：1
Voltage - Supply (Vcc/Vdd)：4.5V ~ 5.5V
Frequency - Switching：-
Duty Cycle (Max)：-
Synchronous Rectifier：Yes
Clock Sync：No
Serial Interfaces：-
Control Features：Current Limit, Enable, On Time Control, Phase Control, Power Good
Operating Temperature：-40°C ~ 85°C (TA)
Mounting Type：Surface Mount
Package / Case：12-WFQFN Exposed Pad
Supplier Device Package：12-WQFN (2x2)
Grade：-
Qualification：-

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RT8228AZQW

Overview

The RT8228AZQW is a single synchronous buck PWM controller manufactured by Richtek USA Inc. It utilizes a constant on-time control scheme to step down high voltage batteries for generating low voltage CPU core, I/O, and chipset RAM supplies. The device features an adjustable output range from 0.5V to 3.3V with a built-in 1% reference voltage. It supports a battery input range of 4.5V to 26V and offers a quick load step response within 100ns. The controller operates in a WQFN-12L 2x2 package.

Feature Summary

Employs constant on-time PWM control for wide input/output voltage ratios and fast transient response
Eliminates external current sense resistors by using low-side RDS(ON) sensing for cost reduction and efficiency enhancement
Supports Audio Skipping Mode (ASM) to maintain switching frequency above 25kHz and eliminate audio noise
Features internal ramp current limit soft-start control and diode emulation mode at light loads

Applications

Notebook computers
CPU core supply
Chipset/RAM supply as low as 0.5V
Generic DC/DC power regulator

Procurement Notes

Verify the specific suffix 'ZQW' against the manufacturer's official datasheet to confirm package type and environmental compliance status. Ensure the component matches the required input voltage range of 4.5V to 26V and output specifications for your design. Confirm availability through authorized distributors as part numbers may have lifecycle variations.

Selection Notes

Select this controller for applications requiring high efficiency without external current sense resistors. It is suitable for stepping down high voltage batteries to low voltage rails such as CPU cores or chipsets. Consider the 100ns transient response and ASM feature if audio noise immunity is critical. Verify compatibility with the target synchronous rectifier MOSFETs.

Part Context

The RT8228A series belongs to Richtek's line of synchronous buck PWM controllers designed for notebook and portable computing applications. These controllers focus on providing high efficiency and excellent transient response for low voltage, high current supplies. The family typically includes variants optimized for different package sizes and thermal requirements while maintaining similar control architectures.