S-8521B25MC-ATKT2U

Overview

The S-8521B25MC-ATKT2U is a step-down DC-DC controller IC manufactured by ABLIC Inc. It operates in a fixed 2.5V output configuration and utilizes PWM/PFM switching control topology. The device is housed in an SOT-23-5 surface-mount package. It supports an input voltage range of 0.9V to 6V, delivering up to 200mA output current. The unit functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates PWM/PFM hybrid switching control for optimized efficiency across varying load conditions
• Supports low-voltage operation with an input range starting from 0.9V
• Designed for compact power management applications using a small SOT-23-5 footprint

Applications

• Battery-powered portable electronic devices
• Low-voltage embedded systems requiring step-down regulation
• General-purpose power management integrated circuits (PMIC)

Procurement Notes

Verify the specific suffix ATKT2U against the official ABLIC datasheet to confirm packaging and tape-and-reel specifications. Ensure compatibility with existing PCB footprints for the SOT-23-5 package. Confirm that the 2.5V fixed output aligns with system requirements, as alternative voltage options exist within the S-8521 series. Check for end-of-life status or obsolescence notices before finalizing procurement plans.

Selection Notes

Select this component when a fixed 2.5V output is required for low-voltage buck conversion. The SOT-23-5 package suits space-constrained designs. Verify that the 200mA current capability meets the load demands. Consider the PWM/PFM control mode for balancing efficiency and ripple performance. Ensure the input voltage source remains within the 0.9V to 6V operational window for stable regulation.

Part Context

This part belongs to the S-8521 series of step-down DC-DC controllers from ABLIC. The series offers various fixed output voltages tailored for different logic levels. The S-8521B25MC variant specifically provides a 2.5V output. It is designed for applications needing efficient power conversion from higher battery voltages down to lower digital supply rails.

Replacement Considerations

Direct substitutes include other S-8521 series parts with identical pinouts but different output voltages, such as S-8521B30MC-ATKT2U (3.0V) or S-8521B33MC-ATKT2U (3.3V). Cross-reference with similar buck controllers from other manufacturers only if electrical parameters and package dimensions match exactly.