S-8521B29MC-ATOT2G

Overview

The S-8521B29MC-ATOT2G is a synchronous rectification DC-DC controller manufactured by ABLIC Inc. It operates in a buck topology with a fixed switching frequency of 1 MHz and supports up to 100% duty cycle. The device accepts an input voltage range of 2.2 V to 5.5 V and provides a fixed output voltage of 2.9 V. Designed for surface mount installation, it utilizes the SNT-A-6 package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Synchronous rectification architecture for enhanced efficiency
• Constant On-Time (COT) control method
• Integrated shutdown functionality for power management

Applications

• Portable electronic devices requiring low quiescent current
• Battery-powered equipment utilizing single-cell lithium-ion sources
• Embedded systems needing compact step-down voltage regulation

Procurement Notes

Verify the specific suffix ATOT2G against official ABLIC documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the SNT-A-6 footprint during PCB layout. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing procurement orders.

Selection Notes

Select this component when a fixed 2.9 V output is required from a 2.2 V to 5.5 V input source. The synchronous design suits applications prioritizing efficiency over external component count. Verify that the load current requirements align with the controller's driver capabilities and that the operating temperature range meets the system's environmental constraints.

Part Context

This part belongs to the S-85S1A series of low-power switching regulators. The series is characterized by its small form factor and high integration level, targeting modern portable electronics where space and power consumption are critical design parameters.

Replacement Considerations

Cross-reference with other S-85S1A variants offering different fixed output voltages if the 2.9 V specification does not match the target rail. Ensure any substitute maintains the SNT-A-6 package and synchronous rectification features.