S-8521C35MC-BTUT2G

Overview

The S-8521C35MC-BTUT2G is a CMOS step-down switching regulator controller from the S-8521 series, manufactured by ABLIC Inc. It utilizes PWM/PFM switching control to maintain high efficiency across varying load conditions. The device operates with a fixed switching frequency of 60kHz and supports a maximum duty cycle of 100%. It features a positive output configuration and accepts a supply voltage (Vcc/Vdd) range of 2.5V to 10V. Designed for surface mount installation, it is housed in an SC-74A (SOT-753) package with five terminals. The component functions within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Supports automatic transition between PWM and PFM control modes to optimize efficiency under light loads
• Includes an internal error amplifier and soft-start circuit to prevent startup overshoot
• Capable of linear duty ratio variation from 0% to 100% for low-ripple power delivery

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Embedded systems utilizing external P-channel MOSFETs or PNPs for step-down conversion
• Industrial equipment operating within standard commercial temperature ranges

Procurement Notes

Verify the specific suffix 'BTUT2G' against official ABLIC documentation to confirm package type and reel quantity. Ensure compatibility with the required input voltage range of 2.5V to 10V for your specific application design. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing procurement orders.

Selection Notes

Select this controller when designing a synchronous or non-synchronous buck converter requiring high efficiency at both heavy and light loads. It is suitable for applications needing a compact solution with external power switches. Consider the 60kHz switching frequency for balancing component size and electromagnetic interference. Ensure the external components match the controller's drive capabilities and thermal requirements.

Part Context

This component belongs to the S-8521 series of CMOS step-down switching regulator controllers. The series is characterized by its ability to switch between PWM and PFM modes, ensuring stable operation and high efficiency. It integrates essential control circuits including reference voltage sources, oscillation circuits, and error amplifiers, making it a versatile choice for DC-DC converter designs.

Replacement Considerations

The S-8521D27MC-BXMT2U is a related part within the same family but differs in supply voltage specifications. Verify if the 2.5V to 16V range of the D-series variant is compatible with your system constraints. Cross-reference pinouts and functional parameters to ensure direct interchangeability without circuit modification.