S-8521B36MC-ATVT2G

Overview

The S-8521B36MC-ATVT2G is a step-down DC-DC switching controller IC manufactured by ABLIC Inc. It operates with a fixed switching frequency of 60 kHz and supports a maximum duty cycle of 100%. The device accepts an input supply voltage ranging from 2.5 V to 10 V and provides a single positive output configuration. Designed for surface-mount installation, it utilizes the SC-74A (SOT-753) package variant within the SOT-23-5 family. The component functions as a transistor driver with enable control characteristics and is rated for an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports 100% maximum duty cycle operation for efficient low-dropout performance in buck converter applications.
• Integrates enable control functionality to manage power states and optimize system energy consumption.
• Utilizes a compact SC-74A (SOT-753) surface-mount package suitable for space-constrained designs.

Applications

• Portable electronic devices requiring efficient step-down voltage regulation
• Battery-powered systems utilizing single-cell lithium-ion or lithium-polymer sources
• General-purpose embedded circuits needing stable 3.6V logic supplies

Procurement Notes

Verify the specific suffix ATVT2G against official ABLIC documentation to confirm tape-and-reel packaging specifications and marking codes. Confirm that the component status aligns with current design-in requirements, as availability may vary. Ensure compatibility with standard SOT-23-5 footprint layouts during PCB assembly planning.

Selection Notes

Select this model when a fixed 60 kHz switching frequency is required for EMI management. Choose the S-8521 series over the S-8520 series if the application input voltage does not exceed 10 V. Verify that the external inductor and capacitor values match the internal compensation parameters for stability at the target load current.

Part Context

This component belongs to the S-8521 series of non-synchronous buck controllers. It shares architectural similarities with the S-8520 series but differs in input voltage limits and switching frequencies. The S-8521 series targets applications where moderate switching speeds and lower input voltage ranges are sufficient for power conversion needs.

Replacement Considerations

The S-8521C27MC-BTMT2G serves as a functional substitute within the same series, offering identical topology but differing in output voltage setting and suffix markings. Cross-reference pinouts and thermal characteristics before substitution.