S-8520A35MC-AVUT2G

Overview

The S-8520A35MC-AVUT2G 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 operates with an input voltage range of 2.5V to 10V and supports a switching frequency of 180kHz. It features a duty ratio capability varying linearly from 0% up to 100%, ensuring excellent transient characteristics. The component is housed in a compact SOT-23-5 package and is designed for surface mount installation.

Feature Summary

• Integrates PWM control circuitry for linear duty ratio adjustment from 0% to 100%
• Includes built-in soft-start circuit to prevent output overshoot during startup
• Contains internal reference voltage source, oscillation circuit, and error amplifier

Applications

• Step-down DC-DC converter designs requiring low ripple
• Portable electronic devices utilizing external Pch MOS FETs or PNPs
• Battery-powered systems requiring high efficiency across load ranges

Procurement Notes

Verify the specific suffix AVUT2G against official ABLIC documentation to confirm exact marking codes and tape/reel specifications. Ensure compatibility with required external components such as inductors and capacitors for stable operation within the specified temperature range.

Selection Notes

Select this controller when fixed-frequency PWM operation is preferred over PFM modes. It is suitable for applications demanding precise duty cycle linearity and robust transient response without the complexity of variable frequency control schemes found in other series members.

Part Context

This component belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. While the S-8521 series offers dual-mode PWM/PFM control, the S-8520 series focuses exclusively on PWM control to maintain consistent switching frequencies and simplified noise filtering requirements in power supply designs.

Replacement Considerations

Direct substitutes include other S-8520 series variants with compatible output voltages and pin configurations. Verify that alternative parts support the same 180kHz switching frequency and 100% maximum duty cycle requirement.