S-8521B32MC-ATRT2G

Overview

The S-8521B32MC-ATRT2G is a CMOS step-down switching regulator controller from ABLIC Inc., designed for efficient power management in compact electronic systems. It operates within an input voltage range of 2.5V to 10V and supports a fixed output voltage of 3.2V. The device utilizes PWM/PFM switching control with a typical switching frequency of 60kHz, ensuring high efficiency across varying load conditions. Packaged in a space-saving SOT-23-5 format, it functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Supports automatic switching between PWM and PFM modes to maintain high efficiency under light loads
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Features a linear duty ratio variation capability from 0% to 100% for precise regulation

Applications

• Battery-powered portable devices requiring extended operational life
• Embedded systems utilizing single-cell lithium-ion or lithium-polymer batteries
• Compact consumer electronics with strict size constraints

Procurement Notes

Verify the specific suffix 'ATRT2G' against official ABLIC documentation to confirm tape-and-reel packaging and marking codes. Confirm that this part number is suitable for new designs, as related series may carry obsolescence warnings. Ensure compatibility with external components such as MOSFETs and inductors before finalizing procurement specifications.

Selection Notes

Select this component when designing buck converters that require adaptive efficiency management through mode switching. It is appropriate for applications where input voltages fluctuate near the lower end of the 2.5V threshold. Engineers should evaluate the external component selection carefully to match the 60kHz switching frequency and ensure thermal performance within the specified operating temperature range.

Part Context

This model belongs to the S-8521 series of step-down switching regulator controllers. The series is characterized by its ability to combine PWM and PFM controls for optimized power consumption. It serves as a core control IC that requires external power switches and passive components to complete the DC-DC conversion circuit.

Replacement Considerations

The S-8521C27MC-BTMT2G is a documented variant within the same family, offering a different fixed output voltage. Verify pinout compatibility and output voltage requirements before substituting.