S-8520B28MC-ARNT2U

Overview

The S-8520B28MC-ARNT2U is a CMOS step-down switching regulator controller from the ABLIC S-8520 series. It utilizes Pulse Width Modulation (PWM) control to maintain stable output voltage. The device operates with an input voltage range of 2.5 V to 16 V and provides a fixed output voltage of 2.8 V. It features a maximum switching frequency of 375 kHz and supports a duty ratio ranging from 0% to 100%. The integrated circuit includes a soft-start circuit to prevent startup overshoot and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Implements PWM control for linear duty ratio variation from 0% to 100%, ensuring low ripple and high efficiency.
• Integrates a reference voltage source, oscillation circuit, error amplifier, and soft-start circuit.
• Supports external Pch power MOS FET or PNP transistor configurations for step-down regulation.

Applications

• Portable electronic devices requiring efficient power management
• Battery-powered equipment needing extended standby time
• General-purpose DC-DC conversion circuits

Procurement Notes

Verify that the specific suffix ARNT2U matches the required package type and tape-and-reel specifications. Confirm the fixed output voltage aligns with the target application requirements. Ensure compatibility with the intended switching frequency and external component selection. Check RoHS compliance status if restricted substances are a concern for the final assembly.

Selection Notes

Select this model when a fixed 2.8 V output is required without external feedback adjustment. Choose based on the need for pure PWM control rather than the hybrid PWM/PFM mode found in the S-8521 series. Consider the 375 kHz switching frequency for balancing component size and efficiency. Evaluate the SOT-23-5 package constraints against board space limitations.

Part Context

This component belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The S-8520 series specifically focuses on PWM control for consistent performance across varying loads. It differs from the S-8521 series by lacking automatic light-load PFM switching, relying instead on continuous PWM operation for stability and noise reduction.

Replacement Considerations

S-8520E22MC-BJH-T2G offers similar PWM control but with a different fixed output voltage. S-8520F15MC-BNAT2U provides comparable functionality with a distinct output level. Verify pinout compatibility and thermal characteristics before substituting any alternative part numbers.