S-8521A29MC-AXOT2G

Overview

The S-8521A29MC-AXOT2G 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 accepts a supply voltage (Vcc/Vdd) ranging from 2.5V to 10V. It features a single positive output configuration utilizing a transistor driver stage. The component is housed in an SC-74A, SOT-753 package (SOT-23-5) for surface-mount installation. It functions without synchronous rectification or clock synchronization capabilities.

Feature Summary

• Supports 100% maximum duty cycle operation for low dropout performance
• Integrated enable control feature for power management
• Fixed 60kHz internal switching frequency

Applications

• Step-down voltage regulation in portable electronic devices
• Power supply circuits for battery-operated equipment
• General-purpose DC-DC conversion in consumer electronics

Procurement Notes

Verify the specific suffix AXOT2G against official ABLIC documentation to confirm tape-and-reel specifications and marking codes. Confirm that the component status is acceptable for current designs, as availability may be limited. Ensure the operating temperature range of -40°C to +85°C aligns with the target application environment requirements before finalizing procurement.

Selection Notes

Select this controller when a non-synchronous buck topology is required with a wide input voltage range up to 10V. The fixed 60kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the SOT-23-5 package constraints for thermal management and PCB layout space. Verify that external MOSFET selection matches the drive capability of the transistor driver output stage.

Part Context

This part belongs to the S-8521 series of step-down DC-DC controllers from ABLIC Inc. The series is designed for efficient power management in compact applications. The S-8521 family typically offers various output voltage options through external resistor networks, providing flexibility for different system voltage rails while maintaining a consistent control architecture and package footprint.

Replacement Considerations

Check ABLIC datasheets for other S-8521 variants with compatible pinouts and electrical characteristics. Verify if alternative packages or suffixes within the same series meet the specific voltage and current requirements of the design.