S-8521F33MC-BPST2U

Overview

The S-8521F33MC-BPST2U is a step-down DC-DC switching controller manufactured by ABLIC Inc. It operates with a fixed switching frequency of 300 kHz and supports an input voltage range from 2.5 V to 6 V. The device provides a positive output configuration with a fixed output voltage of 3.3 V. It features a maximum duty cycle of 100% and utilizes a single output channel. The component is housed in a compact SOT-23-5 package, suitable for surface-mount applications.

Feature Summary

• Step-down topology with fixed 3.3 V output
• High switching frequency for compact external components
• 100% duty cycle capability for low dropout operation

Applications

• Battery-powered portable electronics
• Low-voltage digital logic power supplies
• Embedded system core voltage regulation

Procurement Notes

Verify the specific suffix BPST2U against official ABLIC documentation to confirm pinout and thermal characteristics. Confirm availability status as lifecycle changes may affect supply chain stability. Ensure compatibility with existing PCB footprint designs before procurement.

Selection Notes

Select this component when a fixed 3.3 V output is required from a 2.5 V to 6 V input source. The 300 kHz frequency allows for smaller inductors compared to lower-frequency alternatives. Verify that the load current requirements are within the controller's driving capabilities for the external switch.

Part Context

This part belongs to the S-8521 series of step-down controllers from ABLIC. It is designed for efficient power management in space-constrained environments. The SOT-23-5 package minimizes board area usage while maintaining reliable thermal performance for standard operating conditions.

Replacement Considerations

The S-8521F33MC-BPST2G is listed as a substitute part number. Verify pin compatibility and electrical specifications before substitution.