S-8521B18MC-ATDT2U

Overview

The S-8521B18MC-ATDT2U is a step-down switching controller IC from ABLIC, designed for DC-DC converter applications. It operates with an input voltage range of 2.5V to 16V and features a fixed switching frequency of 180kHz. The device supports positive output configurations and includes an enable control feature. Packaged in a compact SOT-23-5 (SC-74A) surface-mount housing, it is rated for operation within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated step-down topology controller for efficient power conversion
• Fixed 180kHz switching frequency for optimized external component sizing
• Enable pin functionality for precise power management control

Applications

• Battery-powered portable electronic devices
• General purpose DC-DC step-down power supplies
• Embedded systems requiring regulated lower voltage rails

Procurement Notes

Verify the specific suffix ATDT against official ABLIC documentation to confirm tape-and-reel packaging and marking codes. Confirm RoHS compliance status via current datasheets. Check for end-of-life notifications or alternative recommendations directly from the manufacturer before finalizing procurement plans.

Selection Notes

Select this model when a fixed 180kHz frequency and 16V maximum input are required. Ensure the application benefits from the SOT-23-5 footprint constraints. Validate that the external inductor and capacitor selections align with the internal controller's drive capabilities and stability requirements.

Part Context

This component belongs to the S-8521 series of switching controllers. It complements other ABLIC PMIC offerings by providing dedicated control logic for buck converters, distinct from linear regulators or boost converters within the broader portfolio.

Replacement Considerations

Consult official substitution lists for direct equivalents. Verify pin compatibility and electrical parameter alignment if considering cross-reference parts.