AS3561-BWLM

Overview

The AS3561-BWLM is a Class-H stereo headphone amplifier designed for portable devices. It features an integrated DC-DC buck converter and charge pump, enabling direct battery connection with a supply range of 2.3V to 5.5V. The device delivers 2x30mW output into 16Ω loads with 0.02% THD and >100dB SNR. Key electrical parameters include a 1mA quiescent current and less than 5μA shutdown current. It supports I²C control for 32-step volume adjustment and includes overtemperature and short-circuit protection.

Feature Summary

• Class-H architecture with integrated DC-DC buck converter for optimized power efficiency
• Integrated charge pump generates symmetric negative supply for true ground output without coupling capacitors
• I²C interface provides independent channel enable and 32-step volume control
• Fully differential inputs with SGND pin minimize system noise and interference sensitivity

Applications

• Mobile Phones
• Portable Navigation Devices
• Media Devices

Procurement Notes

Verify the specific ordering code suffix against the manufacturer's official documentation to confirm package type and delivery form. Ensure compatibility with the required I²C logic levels and external component values specified in the application schematic. Confirm RoHS compliance status if required by the target assembly process.

Selection Notes

Select this component for applications requiring high audio fidelity with minimal power consumption. The Class-H topology offers significant power savings compared to traditional Class-AB amplifiers. Verify that the system design accommodates the necessary external passive components for the buck converter and charge pump circuits as detailed in the datasheet.

Part Context

The AS3561 is manufactured by austriamicrosystems AG (now part of ams-OSRAM). It belongs to a family of audio amplifiers optimized for mobile electronics. The device utilizes a 16-ball WLCSP package measuring 1.615mm x 1.615mm, suitable for space-constrained portable designs.

Replacement Considerations

The AS3561-BWLT is listed in the ordering information as the standard product available in Tape & Reel format within the same WCSP package.