S-8521B29MC-ATOT2U

Overview

The S-8521B29MC-ATOT2U is a positive output step-down DC-DC controller IC manufactured by ABLIC Inc. It operates within a supply voltage range of 2.5V to 16V and features a fixed switching frequency of 180kHz. The device supports a maximum duty cycle of 100% and provides one output phase. Packaged in an SOT-23-5 format, it functions as a buck regulator controller for power management applications.

Feature Summary

• Supports 100% duty cycle operation for efficient low-dropout performance
• Fixed 180kHz switching frequency for stable regulation
• Wide input voltage range from 2.5V to 16V

Applications

• Battery-powered portable devices
• General-purpose step-down power conversion
• Embedded systems requiring regulated lower voltages

Procurement Notes

Verify the exact suffix ATOT2U against official ABLIC documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as environmental declarations can vary by production batch. Ensure the sourcing channel is authorized to guarantee component authenticity and traceability.

Selection Notes

Select this component when a fixed 180kHz buck controller is required with a wide input voltage capability up to 16V. The 100% duty cycle feature makes it suitable for applications where the input voltage may closely approach the desired output voltage. Verify that external inductor and capacitor selections align with the internal compensation and switching characteristics defined in the datasheet.

Part Context

This part belongs to the S-8521 series of DC-DC switching controllers from ABLIC Inc. It is categorized under PMIC - DC DC Switching Controllers. The specific model indicates a buck regulator configuration designed for positive output step-down applications, distinct from LDO regulators or boost converters within the broader product portfolio.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Cross-referencing should be performed using electrical parameters such as switching frequency, input voltage range, and package dimensions via official manufacturer databases.