S-8520D32MC-BVRT2G

Overview

The S-8520D32MC-BVRT2G is a CMOS step-down switching regulator controller manufactured by ABLIC Inc. It belongs to the S-8520/8521 series and utilizes Pulse Width Modulation (PWM) control technology. The device operates with an input voltage range of 2.5V to 10V and supports a maximum switching frequency of 375kHz. It features a linear duty ratio variation from 0% up to 100%, ensuring low ripple and high efficiency. The IC includes an integrated reference voltage source, oscillation circuit, error amplifier, and soft-start circuit to prevent startup overshoot. It is housed in a compact SOT-23-5 package.

Feature Summary

• Implements PWM control for linear duty ratio adjustment from 0% to 100%
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Contains internal reference voltage, oscillation, and error amplifier circuits

Applications

• Step-down switching regulator designs requiring low ripple power
• Applications demanding high efficiency and excellent transient characteristics
• Systems utilizing external Pch power MOS FETs or PNPs with coils and capacitors

Procurement Notes

Verify the specific suffix 'BVRT2G' against official ABLIC documentation to confirm exact marking codes and packaging specifications. Confirm RoHS compliance status and REACH registration details directly with the manufacturer. Ensure the component meets the required operating temperature range of -40°C to +85°C for your specific application environment before finalizing procurement.

Selection Notes

Select this component when a fixed PWM control scheme is preferred over the mixed PWM/PFM operation found in the S-8521 series. It is suitable for designs prioritizing consistent duty ratio linearity across the full load range. Consider the 375kHz maximum switching frequency when sizing external passive components. Verify that the external driver stage matches the controller's output configuration requirements.

Part Context

This part is a member of the S-8520/8521 series of CMOS step-down switching regulator controllers. While the S-8521 variant offers automatic switching between PWM and PFM modes for light-load efficiency, the S-8520 series focuses on pure PWM control. This distinction allows designers to choose based on whether variable frequency PFM benefits are necessary or if constant frequency PWM is strictly required.

Replacement Considerations

Direct substitutes within the same family include other S-8520 variants with different output voltage settings. Cross-series replacement with S-8521 models requires accounting for the additional PFM control capability. Verify pin compatibility and thermal performance when substituting with similar buck controllers from other manufacturers.

FAQ

Does the S-8520D32MC-BVRT2G support PFM control?

No, the S-8520 series exclusively uses PWM control. Automatic switching to PFM mode is a feature of the S-8521 series.

What is the purpose of the soft-start circuit in this IC?

The integrated soft-start circuit prevents overshoot at startup, protecting downstream components from sudden voltage spikes.