RT8241DZQW

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

SKU:96a85e0a8991 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),Cut Tape (CT)
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, 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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RT8241DZQW

Overview

The RT8241DZQW is a high-efficiency single synchronous buck PWM controller manufactured by Richtek Technology Corporation. Designed for notebook computers, it steps down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies. The device features a constant-on-time control scheme for wide input/output voltage ratios and provides an instant-on response to load transients while maintaining a relatively constant switching frequency of 300kHz. It eliminates the current-sense resistor found in traditional current-mode PWMs to achieve high efficiency at reduced cost.

Feature Summary

Supports on-chip voltage programming function between 0.675V and 0.9V via digital inputs
Provides 100ns instant-on response to load transients
Eliminates external current-sense resistors to reduce system cost
Drives large synchronous rectifier MOSFETs and enters diode emulation mode at light loads

Applications

Notebook computer CPU core power supplies
I/O power supply generation
Chipset RAM power supply generation
High voltage battery step-down conversion

Procurement Notes

Verify the specific suffix DZ against official datasheets to confirm package type and temperature range. Ensure compatibility with required output voltage settings and switching frequency requirements. Check moisture sensitivity level handling procedures during assembly. Confirm RoHS compliance status for environmental regulations. Validate pinout configuration against target PCB layout design.

Selection Notes

Select this controller for applications requiring high efficiency without external current sensing resistors. Suitable for designs needing fast transient response from battery sources. Ideal for space-constrained systems due to integrated synchronous rectification drive capability. Consider thermal performance when driving large MOSFETs. Verify input voltage range compatibility with available power sources.

Part Context

The RT8241 series belongs to Richtek's portfolio of high-efficiency synchronous buck PWM controllers. These devices are specifically engineered for portable computing applications where battery life and compact size are critical. The family utilizes constant-on-time architecture to simplify compensation and improve dynamic performance compared to traditional voltage-mode or current-mode controllers.