S-8521D21MC-BXGT2U

Overview

The S-8521D21MC-BXGT2U is a step-down DC-DC switching controller manufactured by ABLIC Inc. It operates with a fixed switching frequency of 180 kHz and supports a maximum duty cycle of 100%. The device requires a supply voltage (Vcc/Vdd) ranging from 2.5 V to 10 V. It features a single positive output configuration and utilizes a transistor driver output stage. The component is housed in an SC-74A, SOT-753 package, specifically identified as SOT-23-5, and is designed for surface mount installation. It functions within an ambient temperature range of -40°C to 85°C.

Feature Summary

• Supports 100% duty cycle operation for low dropout performance
• Integrated enable control feature for power management
• Fixed 180 kHz switching frequency for compact external component design

Applications

• Portable electronic devices requiring efficient step-down conversion
• Battery-powered systems utilizing the wide input voltage range
• Industrial equipment operating within the specified temperature limits

Procurement Notes

Verify the complete part number including suffixes against official ABLIC documentation to ensure correct pinout and electrical characteristics. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into the manufacturing process. Cross-reference the specific ordering code with manufacturer databases to validate current production status and availability channels.

Selection Notes

Select this controller when a non-synchronous buck topology is required with a fixed 180 kHz frequency. Ensure the application input voltage falls within the 2.5 V to 10 V operational range. Verify that the thermal environment remains between -40°C and 85°C. Consider the SOT-23-5 package constraints for PCB layout and heat dissipation requirements relative to the expected load conditions.

Part Context

This component belongs to the S-8520/8521 series of switching regulators from ABLIC Inc. The series is characterized by its ability to drive external N-channel MOSFETs for buck applications. The D21 suffix typically indicates a specific output voltage setting or internal reference configuration within the product family, distinguishing it from other variants in the same series.

Replacement Considerations

Direct substitutes include the S-8520 series controllers from ABLIC Inc. which share similar pinouts and functional architectures. Verify compatibility regarding the specific output voltage setting associated with the 'D21' designation before substituting with other series members.