S-8520D36MC-BVVT2G

Overview

The S-8520D36MC-BVVT2G is a CMOS step-down switching regulator controller from the S-8520 series, manufactured by ABLIC Inc. It utilizes Pulse Width Modulation (PWM) control to provide low-ripple power and high efficiency. The device features a reference voltage source, oscillation circuit, error amplifier, and soft-start circuit to prevent startup overshoot. It operates with an input voltage range of 2.5V to 10V and supports a maximum switching frequency of 375kHz. The output stage provides a drive current of 0.05A. Designed for surface mount installation in a SOT-23-5 package, it functions within a temperature range of -40°C to 85°C.

Feature Summary

• Implements PWM control for linear duty ratio variation from 0% to 100%, ensuring low output ripple and excellent transient characteristics.
• Integrates a built-in soft-start circuit to suppress voltage overshoot during initial power-up sequences.
• Combines essential internal components including a reference voltage source, oscillation circuit, and error amplifier for compact design.

Applications

• Step-down DC-DC converter circuits requiring precise voltage regulation
• Power supply systems for portable electronic devices
• Embedded systems utilizing external Pch MOS FETs or PNPs

Procurement Notes

Verify the specific suffix BVVT against official datasheets to confirm pinout and marking codes. Confirm availability status as this part may be restricted for new designs. Ensure external component selection matches the 375kHz frequency and 0.05A drive requirements. Check RoHS compliance documentation for final assembly standards.

Selection Notes

Select this controller when fixed-frequency PWM operation is preferred over variable frequency modes. It is suitable for applications requiring stable ripple performance across varying loads. Consider the 0.05A output drive capability when sizing external gate resistors. Evaluate thermal constraints given the SOT-23-5 package limitations.

Part Context

This component belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. Unlike the S-8521 series which supports PWM/PFM switching, the S-8520 series is dedicated to PWM control. This distinction ensures consistent switching behavior without automatic light-load mode transitions.

Replacement Considerations

Direct substitutes include other S-8520 series variants with compatible input ranges and packages. Verify pin compatibility before swapping. Cross-reference with S-8521 series only if PFM support is acceptable.