S-8520F27MC-BNMT2G

Overview

The S-8520F27MC-BNMT2G 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 reference voltage source, oscillation circuit, error amplifier, and soft-start circuit. It operates with an input voltage range of 2.5V to 16V and supports a maximum switching frequency of 300kHz. The IC is housed in a compact SOT-23-5 package and functions as a positive output buck converter.

Feature Summary

• PWM control circuit capable of varying duty ratio linearly from 0% up to 100%
• Integrated soft-start circuit prevents overshoot at startup
• Built-in error amplifier for precise regulation

Applications

• Battery-powered portable devices requiring efficient step-down conversion
• General-purpose DC-DC power supply designs
• Embedded systems utilizing external Pch MOS FETs or PNPs

Procurement Notes

Verify the specific suffix BNMT2G against official ABLIC documentation to confirm pinout and marking codes. Confirm RoHS compliance status and check for any recent Product Change Notices regarding material composition. Ensure the component is suitable for new designs as availability may vary.

Selection Notes

Select this controller when PWM operation is preferred over PFM for consistent noise profiles. It requires external components including a coil, capacitors, diode, and Pch power MOS FET or PNP transistor. Verify that the required switching frequency aligns with the 300kHz capability and that the input voltage stays within the 2.5V to 16V range.

Part Context

This part belongs to the S-8520/8521 Series of CMOS step-down switching regulator controllers. While the S-8521 series offers switchable PWM/PFM modes, the S-8520 series is dedicated to PWM control. This family is designed for applications demanding high efficiency and excellent transient characteristics through linear duty ratio variation.

Replacement Considerations

Check for other S-8520 variants with different output voltages or frequencies. Cross-reference with S-8521 series if PFM mode is acceptable. Verify pin compatibility before substituting.