S-8521B50MC-AUJT2G

Overview

The S-8521B50MC-AUJT2G 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 includes an enable function for power management. 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

• Supports automatic switching between PWM and PFM modes to maintain high efficiency across varying load conditions
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Features a linear duty ratio variation capability from 0% to 100% for precise regulation

Applications

• Battery-powered portable electronic devices requiring efficient step-down conversion
• General-purpose DC-DC power supply circuits in consumer electronics
• Embedded systems utilizing external Pch MOSFETs or PNPs for current handling

Procurement Notes

Verify the specific suffix AUJT2G against the manufacturer's latest datasheet to confirm pinout and marking codes. Check component status as some variants may be marked not recommended for new designs. Ensure compatibility with external components such as coils and capacitors specified in the official design guidelines.

Selection Notes

Select this controller when a small footprint and high efficiency under light loads are required. It is suitable for applications needing a wide input voltage range up to 10V. Consider the external drive requirements for the power switch and ensure the thermal performance of the SOT-23-5 package meets the application's dissipation needs.

Part Context

This part belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The S-8521 variant specifically offers flexible PWM/PFM control, distinguishing it from the pure PWM S-8520 series. It is manufactured by ABLIC Inc., a provider of analog semiconductor solutions.

Replacement Considerations

Direct substitutes include other S-8521 series variants with compatible output voltages and packages, such as S-8521C27MC-BTMT2G. Verify electrical parameters and pin compatibility before substitution.