S-8520D28MC-BVNT2G

Overview

The S-8520D28MC-BVNT2G is a CMOS step-down switching regulator controller manufactured by ABLIC Inc. It operates within an input voltage range of 2.5 V to 10 V and provides a fixed output voltage of 2.8 V. The device utilizes Pulse Width Modulation (PWM) control with a switching frequency of 180 kHz and supports a maximum duty cycle of 100%. Designed for surface-mount applications, it is housed in a compact SOT-23-5 package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates PWM control circuitry capable of linearly varying the duty ratio from 0% up to 100% for low-ripple power delivery.
• Includes a built-in error amplifier and soft-start circuit to prevent output overshoot during startup.
• Supports external Pch power MOS FET or PNP transistor configurations to function as a complete step-down switching regulator.

Applications

• Portable electronic devices requiring efficient DC-DC conversion
• Battery-powered equipment utilizing step-down topology
• General-purpose power supply circuits in consumer electronics

Procurement Notes

Verify the specific suffix BVNT2U against official datasheets to confirm tape-and-reel packaging and marking codes. Ensure compatibility with the required SOT-23-5 footprint and validate that the fixed 2.8 V output aligns with system design requirements before finalizing procurement orders.

Selection Notes

Select this component when a fixed 2.8 V output is required without external programming resistors. The integrated soft-start and error amplifier simplify design compared to basic controllers. Verify that the 180 kHz switching frequency meets electromagnetic interference constraints and that the SOT-23-5 package fits the available board space.

Part Context

This part belongs to the S-8520 Series, which consists of CMOS step-down switching regulator controllers featuring PWM control. The series is designed to provide high efficiency and excellent transient characteristics. Unlike the S-8521 Series, which supports PWM/PFM modes, the S-8520 Series relies exclusively on PWM control for stable operation under varying load conditions.

Replacement Considerations

The S-8520E22MC-BJH-T2G is a verified substitute within the same series, offering identical PWM control features but providing a fixed 2.2 V output instead of 2.8 V. Ensure the target application can accommodate the different output voltage level before substituting.