S-8521C27MC-BTMT2G

Overview

The S-8521C27MC-BTMT2G is a CMOS step-down switching regulator controller from ABLIC Inc., designed for high-efficiency power conversion. It features PWM/PFM switching control, operating at a fixed frequency of 60kHz with a maximum duty cycle of 100%. The device supports an input voltage range of 2.5V to 10V and provides a single positive output via a transistor driver. Packaged in a compact SOT-23-5 (SC-74A) surface-mount housing, it operates within a temperature range of -40°C to 85°C.

Feature Summary

• Integrates PWM and PFM control modes for optimized efficiency across varying load conditions
• Includes built-in soft-start circuitry to prevent startup overshoot
• Supports linear duty ratio variation from 0% to 100% for low-ripple performance

Applications

• Step-down switching regulator circuits requiring external MOSFETs or transistors
• Battery-powered portable electronic devices
• Embedded systems requiring efficient DC-DC conversion

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix matches the required package and temperature rating. Check current availability status as this part may be restricted for new designs. Ensure compliance with RoHS3 and REACH regulations before integration into final products.

Selection Notes

Select this controller when designing buck converters needing flexible light-load efficiency management. It requires external passive components and power switches. Consider the 60kHz switching frequency for filter size trade-offs. Verify that the 2.5V minimum input voltage aligns with the source supply. Ensure the SOT-23-5 footprint fits the target PCB layout constraints.

Part Context

This model belongs to the S-8521 series, which complements the S-8520 series by adding PFM capability. While the S-8520 uses pure PWM, the S-8521 automatically switches to PFM under light loads to maintain high efficiency. Both share similar internal architectures including error amplifiers and reference voltage sources.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.