S-8521C50MC-BUJT2G

Overview

The S-8521C50MC-BUJT2G is a CMOS step-down switching regulator controller from the S-8521 series, manufactured by ABLIC Inc. It operates with a supply voltage range of 2.5V to 10V and features a fixed output voltage of 5.0V. The device utilizes PWM/PFM switching control and supports a maximum switching frequency of 60kHz. It is housed in an SC-74A (SOT-753) package with five terminals. The component is designed for surface mount installation and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Supports automatic switching between PWM and PFM control modes to maintain high efficiency across varying load conditions.
• Includes an integrated error amplifier and soft-start circuit to prevent output overshoot during startup.
• Capable of linear duty ratio variation from 0% to 100% for precise regulation.

Applications

• Portable electronic devices requiring efficient step-down power conversion
• Battery-powered equipment needing extended standby time via PFM mode
• General-purpose DC-DC converter designs using external MOSFETs

Procurement Notes

Verify the specific suffix BUJT2G against the official datasheet to confirm pinout and marking codes. Confirm RoHS compliance status as per the latest manufacturer statement. Check for obsolescence notices or PCN updates regarding material changes before finalizing procurement plans.

Selection Notes

Select this controller when designing non-synchronous buck converters requiring low quiescent current. Ensure external components support the 60kHz switching frequency. Verify that the required output voltage matches the fixed internal reference or adjust if using a different variant from the S-8521 family.

Part Context

This part belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The S-8521 series specifically distinguishes itself by offering dual-mode PWM/PFM operation, unlike the PWM-only S-8520 series. It serves as a core control IC requiring external power switches and passive components.

Replacement Considerations

Direct substitutes include other S-8521 variants with compatible output voltages and packages. Verify pin compatibility and electrical specifications before cross-referencing with generic buck controllers.