S-8521C31MC-BTQT2G

Overview

The S-8521C31MC-BTQT2G is a step-down DC-DC switching controller manufactured by ABLIC Inc. It operates with a fixed switching frequency of 60kHz and supports a maximum duty cycle of 100%. The device features a positive output configuration and utilizes an external transistor driver stage. It accepts a supply voltage range of 2.5V to 10V. The component is housed in a compact SC-74A (SOT-753) surface-mount package, specifically the SOT-23-5 form factor. It is designed for operation across a wide ambient temperature range from -40°C to 85°C.

Feature Summary

• Integrates a buck topology switching controller with a fixed 60kHz operating frequency.
• Supports continuous conduction mode via a maximum 100% duty cycle capability.
• Features an enable control characteristic for power management flexibility.
• Utilizes an external N-channel MOSFET driver stage for synchronous or asynchronous rectification.

Applications

• Battery-powered portable electronic devices requiring efficient voltage regulation.
• Embedded systems utilizing microcontrollers with varying input voltage requirements.
• Industrial control modules operating within standard commercial temperature ranges.
• Consumer electronics utilizing single-cell lithium-ion or lithium-polymer batteries.

Procurement Notes

Verify the specific suffix 'BTQT2G' against official ABLIC documentation to confirm tape and reel specifications and marking codes. Confirm RoHS compliance status as per the latest datasheet revision. Check component availability status, as this part may be marked as not recommended for new designs. Ensure the ordering quantity aligns with manufacturer packaging standards.

Selection Notes

Select this controller when a fixed 60kHz frequency is acceptable for EMI filtering constraints. The 100% duty cycle feature allows direct battery connection without dropout during discharge. Verify that the external MOSFET selection matches the driver current capabilities and voltage ratings. Consider the SOT-23-5 footprint constraints for PCB layout optimization compared to larger packages.

Part Context

This component belongs to the S-8521 series of step-down DC-DC controllers from ABLIC Inc. The series is characterized by low quiescent current and high efficiency in small packages. The S-8521 family provides integrated protection features and stable operation for various load conditions. It serves as a core power management solution for applications requiring compact size and reliable voltage conversion.

Replacement Considerations

Consult the official ABLIC replacement guide for cross-reference options. Verify pin compatibility and thermal performance if substituting with other buck controllers. Ensure the alternative component supports the required 60kHz frequency and 100% duty cycle operation. Check for any differences in enable logic or driver strength in potential substitutes.