RT8237CZQW(2)

Overview

The RT8237CZQW(2) is a high-efficiency single synchronous buck PWM controller manufactured by Richtek USA Inc. It operates with an input voltage range of 4.5V to 5.5V and supports a switching frequency between 290kHz and 430kHz. The device features a 10-WDFN (3x3) package with exposed pad for surface mount installation. It provides positive output configuration with one output stage, utilizing synchronous rectification. Control characteristics include current limit, enable, phase control, and power good signals. The component functions as a step-down DC-DC switching regulator suitable for applications requiring efficient voltage conversion within the specified thermal range.

Feature Summary

• Utilizes constant on-time PWM control scheme for wide input/output voltage ratios
• Eliminates external current sense resistor to reduce cost and enhance efficiency
• Drives large synchronous rectifier MOSFETs and enters diode emulation mode at light loads
• Provides instant-on response to load transients while maintaining relatively constant switching frequency

Applications

• CPU core supply in notebook computers
• Chipset and DRAM supply generation
• Low voltage I/O supplies
• Generic DC-DC power regulators

Procurement Notes

Verify the specific suffix designation against the manufacturer's official documentation to ensure compatibility with required packaging or temperature grades. Confirm that the 10-WDFN footprint matches the target PCB layout constraints. Check for RoHS compliance status and moisture sensitivity level requirements during storage and handling procedures prior to assembly.

Selection Notes

Select this controller when designing systems requiring high efficiency without external current sensing resistors. Ensure the application input voltage remains within the 4.5V to 5.5V operating range. Consider the fixed frequency options if loop compensation simplification is prioritized over variable frequency flexibility. Verify that the 3x3mm package size fits the available board space constraints.

Part Context

This component belongs to the RT8237 family of single synchronous buck PWM controllers designed for notebook computer power architectures. It serves as a key element in generating low-voltage rails for processors and memory subsystems. The device integrates bootstrap switching capabilities and offers adjustable current limiting features typical of modern portable computing power management solutions.

Replacement Considerations

Consult official cross-reference lists for verified substitutes such as other variants within the RT8237 series. Ensure any replacement maintains identical pinout compatibility and electrical specifications for the 10-WDFN package form factor.