S-8520B40MC-ARZT2U

Overview

The S-8520B40MC-ARZT2U is a CMOS step-down switching regulator controller manufactured by ABLIC Inc. It operates with a fixed PWM control mode and supports an input voltage range of 2.5V to 16V. The device provides a fixed output voltage of 4.0V and features a switchable frequency selection between 180kHz and 300kHz. Designed for surface-mount applications, it utilizes the SC-74A (SOT-753) package configuration. The component functions within an ambient temperature range of -40°C to +85°C and includes an enable control feature for power management.

Feature Summary

• Fixed 4.0V output voltage generation via internal reference
• Switchable switching frequency operation between 180kHz and 300kHz
• Integrated error amplifier and oscillation circuit for stable regulation

Applications

• Battery-powered portable electronic devices
• General-purpose DC-DC conversion in embedded systems
• Power supply stages for microcontroller units

Procurement Notes

Verify the specific suffix ARZT2U against official ABLIC documentation to confirm exact marking codes and tape-and-reel specifications. Ensure compatibility with standard SOT-753 footprints during PCB layout. Confirm RoHS compliance status through current manufacturer declarations prior to final procurement authorization.

Selection Notes

Select this component when a fixed 4.0V output is required from a 2.5V to 16V input source without external feedback resistors. The S-8520 series is suitable for designs prioritizing simplicity over adjustable output flexibility. Consider the 180kHz or 300kHz frequency options based on external inductor size constraints and efficiency requirements.

Part Context

This part belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The S-8520 series specifically utilizes pure PWM control, distinguishing it from the S-8521 series which offers PWM/PFM switching modes. This family is designed for cost-effective and compact power management solutions in consumer and industrial electronics.

Replacement Considerations

The S-8520F40MC-BNAT2U is a documented equivalent within the same series offering identical 4.0V output and functional characteristics. Verify pinout and package dimensions match before substitution.