S-8521B23MC-ATIT2G

Overview

The S-8521B23MC-ATIT2G is a CMOS step-down switching regulator controller from the S-8521 series, manufactured by ABLIC Inc. It utilizes PWM/PFM switching control to ensure high efficiency across wide load ranges. The device operates with an input voltage range of 2.5 V to 10 V and features a fixed output voltage of 2.3 V. It employs a soft-start circuit to prevent startup overshoot and supports duty ratios up to 100%. Designed for surface-mount applications, it is housed in a compact SOT-23-5 package.

Feature Summary

• PWM/PFM switching control for optimized efficiency under varying load conditions
• Built-in soft-start circuit to suppress startup overshoot
• Capable of linear duty ratio variation from 0% to 100%
• Integrated reference voltage source and error amplifier

Applications

• Battery-powered portable electronic devices
• General-purpose DC-DC step-down power supplies
• Embedded systems requiring efficient voltage regulation

Procurement Notes

Verify the specific suffix ATIT2G against the manufacturer's current datasheet to confirm pinout and marking codes. Confirm RoHS compliance status as per the latest environmental declaration. Ensure external components match the controller's requirements for stable operation within the specified temperature range.

Selection Notes

Select this component when designing a buck converter requiring high efficiency at both light and heavy loads. It is suitable for applications needing a fixed low-voltage output derived from a higher supply rail. Consider external Pch MOSFET or PNP transistor compatibility for the power stage design.

Part Context

This part belongs to the S-8521 series of switching regulator controllers. The series is characterized by CMOS technology integration, offering low ripple and excellent transient response. It serves as a core control element in external power stage configurations rather than a complete integrated switcher.

Replacement Considerations

The S-8520E23MC-BJH-T2G is a confirmed substitute within the same family, differing primarily in control mode (PWM only). Verify functional equivalence regarding duty cycle range and soft-start timing before substitution.