S-8520D31MC-BVQT2G

Overview

The S-8520D31MC-BVQT2G 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 fixed output voltage of 3.1 V with a maximum output current capability of 50 mA for the driver stage. It operates within an input voltage range of 2.5 V to 10 V and supports a switching frequency up to 375 kHz. The component is housed in a compact SOT-23-5 package and is rated for an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates PWM control circuitry capable of varying duty ratio linearly from 0% to 100% for precise regulation.
• Includes internal error amplifier and soft-start circuit to prevent output overshoot during startup.
• Designed for external connection with P-channel MOS FETs or PNPs to function as a complete step-down converter.

Applications

• Battery-powered portable electronic devices requiring efficient voltage stepping.
• Embedded systems needing stable low-ripple power supplies for sensitive logic circuits.
• Industrial equipment utilizing DC-DC conversion within standard automotive temperature ranges.

Procurement Notes

Verify the specific suffix BVQT2G against official ABLIC documentation to confirm tape-and-reel packaging and marking codes. Confirm RoHS compliance status via the manufacturer's latest environmental declaration. Ensure design-in approval is noted, as this part may carry end-of-life restrictions. Cross-reference the datasheet revision date to validate electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this controller when a dedicated PWM regulation strategy is required for minimal output ripple compared to PFM alternatives. It is suitable for designs where external power switches are preferred for higher current handling than integrated solutions allow. Consider the 375 kHz switching frequency for balancing component size and efficiency. Verify that the external components selected can withstand the voltage and current stresses defined in the absolute maximum ratings.

Part Context

This component belongs to the S-8520/8521 Series of CMOS step-down switching regulator controllers. While the S-8521 variant offers dual-mode PWM/PFM operation, the S-8520 series focuses exclusively on PWM control. This distinction ensures consistent duty cycle linearity across load conditions, making it distinct from the adaptive efficiency modes found in sibling models.

Replacement Considerations

Direct substitutes include other S-8520 series variants with different fixed output voltages, such as S-8520E22MC-BJH-T2G, provided the voltage level matches the application requirement. Ensure any replacement maintains the SOT-23-5 footprint and compatible control topology.