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RT8237CZQW
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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 10WDFN
- 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：290kHz ~ 430kHz
- 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：10-WFDFN Exposed Pad
- Supplier Device Package：10-WDFN (3x3)
- Grade：-
- Qualification：-
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Overview
The RT8237CZQW is a high-efficiency single synchronous buck PWM controller manufactured by Richtek USA Inc. It operates within an input voltage range of 4.5V to 5.5V and supports a switching frequency between 290kHz and 430kHz. The device provides a positive output configuration housed in a 10-WDFN (3x3) package with exposed pad. Key electrical parameters include a supply voltage (Vcc/Vdd) of 4.5V to 5.5V and operation across a temperature range of -40°C to 85°C. It features cycle-by-cycle current limiting, enable control, phase control, and power good indication.
Feature Summary
- Employs constant on-time PWM control for wide input/output voltage ratios
- Eliminates external current sense resistor to reduce design cost
- Drives large synchronous rectifier MOSFETs for enhanced efficiency
- Enters diode emulation mode at light load conditions
Applications
- CPU core supplies in notebook computers
- Chipset and RAM power supplies
- Low voltage generic DC-DC power regulators
Procurement Notes
Verify the specific suffix 'C' against the manufacturer datasheet to confirm pinout compatibility and electrical tolerances. Ensure the 10-WDFN footprint matches the PCB layout requirements. Confirm RoHS compliance status if required by local regulations. Check moisture sensitivity level handling procedures during assembly.
Selection Notes
Select this component when designing low-voltage, high-current rails for portable computing devices. The fixed on-time architecture simplifies loop compensation compared to traditional current-mode controllers. Consider the absence of an external sense resistor as a cost-saving advantage. Verify that the input voltage range aligns with the system's battery or rail specifications.
Part Context
This part belongs to the RT8237 series of synchronous buck controllers designed for notebook applications. It complements other Richtek PMIC solutions like the RT8207 and RT8231, which target memory power supplies. The series focuses on high efficiency and transient response for CPU and chipset power delivery.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Consult the official Richtek datasheet for direct cross-reference information before substitution.
