S-8521A25MC-AXKT2U

Overview

The S-8521A25MC-AXKT2U is a synchronous step-down switching regulator IC manufactured by ABLIC Inc. It features a fixed 2.5 V output voltage and operates within an input voltage range of 2.5 V to 16 V. The device integrates high-efficiency synchronous rectification with internal N-channel MOSFETs, supporting a maximum output current of 3 A. It utilizes pulse-width modulation (PWM) for stable regulation and includes built-in protection functions such as overcurrent protection and thermal shutdown. The component is housed in a compact SOT-23-5 package and supports operation temperatures from -40°C to +85°C.

Feature Summary

• Integrates high-efficiency synchronous rectification using internal N-channel MOSFETs for reduced external component count.
• Provides stable DC-DC conversion via fixed-frequency PWM control with low ripple output.
• Includes comprehensive protection mechanisms against overcurrent conditions and excessive temperature.

Applications

• Portable electronic devices requiring efficient power management
• Battery-powered systems needing regulated voltage supply
• Embedded applications utilizing single-cell lithium-ion battery inputs

Procurement Notes

Verify the specific suffix AXKT2U against official ABLIC documentation to confirm tape-and-reel packaging specifications and marking codes. Ensure compatibility with standard SOT-23-5 footprint dimensions during PCB layout. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before final procurement approval.

Selection Notes

Select this component when a fixed 2.5 V output is required from a 2.5 V to 16 V input source. The integrated synchronous design minimizes external inductor and diode requirements compared to non-synchronous alternatives. Consider the 3 A current capability and thermal performance characteristics relative to the expected load profile and ambient operating conditions.

Part Context

This part belongs to the S-8521 series of synchronous buck regulators from ABLIC. The series is designed for space-constrained applications requiring high efficiency and minimal external components. The S-8521 family typically offers various fixed output voltages while maintaining consistent control architecture and protection features across the lineup.

Replacement Considerations

Direct substitutes include other ABLIC synchronous buck regulators with identical pinouts and electrical characteristics, such as variants within the same S-8521 series offering different fixed output voltages if system requirements allow adjustment.