S-8521D25MC-BXKT2G

Overview

The S-8521D25MC-BXKT2G is a CMOS step-down switching regulator controller from the S-8520/8521 Series by ABLIC Inc. It features PWM/PFM switching control and operates within an input voltage range of 2.5V to 10V. The device utilizes a SOT-23-5 (SC-74A) surface-mount package and supports a maximum switching frequency of 60kHz with up to 100% duty cycle. Designed for high efficiency across wide load ranges, it includes built-in soft-start and error amplifier circuits.

Feature Summary

• Supports automatic switching between PWM and PFM control modes to maintain high efficiency under varying load conditions
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Provides linear duty ratio variation from 0% to 100% via PWM control for low-ripple power delivery

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Embedded systems utilizing microcontrollers with 2.5V to 10V supply requirements
• Industrial equipment operating in environments with variable load profiles

Procurement Notes

Verify the specific suffix BXKT2G against official ABLIC documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status and check for any recent PCN notifications regarding marking or material changes before finalizing procurement plans.

Selection Notes

Select this component when designing buck converters that require adaptive efficiency optimization through mode switching. Ensure external components such as inductors and capacitors are rated for the 60kHz switching frequency and 10V maximum input voltage constraints defined in the datasheet.

Part Context

This part belongs to the S-8521 Series, which complements the S-8520 Series by adding PFM capability. While the S-8520 series focuses on fixed PWM control for consistent ripple performance, the S-8521 series targets applications where standby current reduction is critical through automatic transition to pulse-frequency modulation at light loads.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific model variant are not available in the provided source data. Verify compatibility with generic S-8521 family members only if electrical parameters match exactly.