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RT8237EZQW(2)
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Product Detailed Parameters
- Description：HIGH EFFICIENCY SINGLE SYNCHRO
- 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)：2.7V ~ 26V
- Frequency - Switching：290kHz ~ 430kHz
- Duty Cycle (Max)：-
- Synchronous Rectifier：Yes
- Clock Sync：No
- Serial Interfaces：-
- Control Features：Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：10-WFDFN Exposed Pad
- Supplier Device Package：10-WDFN (3x3)
- Grade：-
- Qualification：-
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Overview
The RT8237EZQW(2) is a high-efficiency single synchronous buck PWM controller manufactured by Richtek USA Inc. It utilizes a constant on-time control scheme to handle wide input-to-output voltage ratios, providing excellent transient response and high DC output accuracy. The device operates with an input voltage range of 2.7V to 26V and delivers an adjustable output voltage from 0.7V to 3.3V with 0.5% accuracy. The typical switching frequency is 340kHz, ranging from 290kHz to 430kHz. It features a low quiescent current of 0.5mA and is housed in a compact WDFN-10L 3x3 package.
Feature Summary
- Eliminates the need for external current sense resistors to reduce cost and enhance efficiency
- Provides instant-on response to load transients while maintaining relatively constant switching frequency
- Drives large synchronous rectifier MOSFETs and enters diode emulation mode at light loads
Applications
- CPU core supplies in notebook computers
- Chipset and DRAM power supplies
- Low voltage I/O generation from high voltage batteries
- Generic DC-DC power regulators
Procurement Notes
Verify the specific suffix 'EZQW(2)' against the manufacturer's official datasheet to confirm pinout compatibility and thermal characteristics. Ensure the ordering documentation explicitly references the Richtek USA Inc. part number to avoid confusion with similar Buck controllers in the family. Confirm RoHS compliance status as per the latest environmental declaration before finalizing procurement.
Selection Notes
Select this component when designing systems that require stepping down battery voltages to low CPU or chipset rails with minimal external components. The absence of a current sense resistor makes it suitable for cost-sensitive designs. Ensure the application demands a switching frequency within the 290kHz to 430kHz range and can accommodate the WDFN-10L package constraints.
Part Context
This part belongs to the Richtek RT8237 series of single synchronous buck PWM controllers. It is designed specifically for portable computing applications where efficiency and transient performance are critical. The series leverages constant on-time control to simplify design while maintaining high performance across varying load conditions.
Replacement Considerations
Consult the official Richtek cross-reference list for verified substitutes. Direct replacements must match the 10-WDFN package and synchronous buck topology. Verify that any alternative maintains the 2.7V to 26V input range and 0.7V minimum output capability.
