S-8520E25MC-BJKT2G

Overview

The S-8520E25MC-BJKT2G is a CMOS step-down switching regulator controller from the S-8520 series by ABLIC Inc. It utilizes Pulse Width Modulation (PWM) control to provide low-ripple power and high efficiency. The device features a linear duty ratio variation from 0% up to 100%. It includes an integrated reference voltage source, oscillation circuit, error amplifier, and a soft-start circuit to prevent startup overshoot. Designed for external Pch power MOS FET or PNP transistor configurations, it operates within a specified input voltage range.

Feature Summary

• PWM control circuit enabling linear duty ratio adjustment from 0% to 100%
• Integrated soft-start circuit to prevent output overshoot during startup
• Built-in error amplifier and reference voltage source for stable regulation

Applications

• Step-down switching regulator designs requiring PWM control
• Power supply systems needing low-ripple output
• Applications requiring prevention of startup overshoot

Procurement Notes

Verify the specific suffix BJKT2G against official ABLIC documentation to confirm package type and tape/reel specifications. Ensure compatibility with external components such as Pch power MOS FETs or PNP transistors, inductors, and capacitors required for the step-down topology. Confirm RoHS compliance status and operating temperature ranges match system requirements before procurement.

Selection Notes

Select this component when PWM control is preferred over PWM/PFM modes for consistent ripple performance. The S-8520 series is suitable for applications where linear duty ratio variation is critical. Compare against the S-8521 series if automatic light-load efficiency optimization via PFM switching is required instead of fixed PWM operation.

Part Context

This part belongs to the S-8520/8521 Series of CMOS step-down switching regulator controllers manufactured by ABLIC Inc. The S-8520 series specifically focuses on PWM control technology, distinguishing it from the S-8521 series which supports both PWM and PFM modes. These controllers are designed to function as complete step-down regulators when paired with appropriate external passive and active components.

Replacement Considerations

The S-8520E25MC-BJHT2G is a documented alternative within the same series offering similar PWM control characteristics. Verify pinout compatibility and electrical parameters against the original datasheet before substitution.