S-8521B26MC-ATLT2G

Overview

The S-8521B26MC-ATLT2G is a CMOS step-down switching regulator controller from the ABLIC S-8521 series, designed for high-efficiency power management. It features PWM/PFM switching control to optimize performance across varying load conditions. The device operates within an input voltage range of 2.5V to 10V and supports a maximum switching frequency of 60kHz. Packaged in a compact SOT-23-5 format, it includes internal reference voltage sources, oscillation circuits, and error amplifiers. The component is rated for operation between -40°C and 85°C, ensuring reliability in diverse electronic applications.

Feature Summary

• Supports automatic switching between PWM and PFM control modes for enhanced efficiency under light loads
• Integrates soft-start circuitry to prevent output voltage overshoot during startup
• Provides linear duty ratio variation from 0% to 100% via PWM control for low-ripple power delivery

Applications

• Battery-powered portable electronics requiring extended standby time
• General-purpose DC-DC conversion in embedded systems
• Power management units for peripheral equipment with variable load profiles

Procurement Notes

Verify the specific suffix 'ATLT2G' against official ABLIC documentation to confirm tape-and-reel packaging and marking codes. Confirm RoHS compliance status and check for any recent PCN notifications regarding design or material changes. Ensure the sourcing channel provides valid traceability for this discontinued or limited-stock item.

Selection Notes

Select this controller when designing buck converters that require adaptive efficiency management. The S-8521 series is suitable for applications needing precise voltage regulation with minimal external component count. Consider the 60kHz frequency limit for inductor selection and ensure the external MOSFET matches the drive current capabilities of the IC.

Part Context

This part belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. While the S-8520 series focuses on pure PWM control, the S-8521 variant adds PFM capability for improved light-load efficiency. This family is characterized by low ripple, high efficiency, and excellent transient response, making it a standard choice for compact power supply designs.

Replacement Considerations

Direct substitutes include other S-8521 series variants with compatible output voltages and package types. Verify pin compatibility and electrical specifications before replacing. Cross-reference with ABLIC's official replacement guide for any updated part numbers within the same functional family.