AAT5101IUR-T1

Overview

The AAT5101IUR-T1 is a high-efficiency, mono Class D audio power amplifier manufactured by Skyworks Solutions Inc. It utilizes a low-noise, filterless PWM architecture to eliminate output filters and reduce external component count. The device operates on a supply voltage range of 2.1V to 5.5V with a quiescent current as low as 1.35mA at 3.6V. It delivers up to 2.5W into a 4Ω load and 1.35W into an 8Ω load. Key performance metrics include a maximum efficiency of 92%, a signal-to-noise ratio of 91dB, and total harmonic distortion plus noise (THD+N) of 0.12% at 5V with an 8Ω load. The amplifier features an internally generated 250kHz switching frequency.

Feature Summary

• Filter-less PWM architecture eliminates the need for output inductors or capacitors, reducing system cost and board space.
• High efficiency up to 92% combined with ultra-low quiescent current extends battery life in portable devices.
• Integrated pop and click noise suppression circuitry ensures silent operation during power-up and shutdown sequences.
• Built-in thermal protection and output short-circuit protection with self-recovery capabilities prevent damage under fault conditions.

Applications

• Cellular phones
• MP4 players
• Notebook computers
• PDAs
• Portable DVD players

Procurement Notes

Verify the specific ordering suffix 'T1' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the WLCSP-9 package dimensions align with the target PCB footprint design. Ensure compliance with halogen-free requirements if mandated by the end-product specifications. Check for any recent product change notices regarding electrical characteristics or pinout definitions before finalizing the bill of materials.

Selection Notes

Select this component for designs requiring high audio fidelity in space-constrained mobile applications. The fully differential input configuration helps maintain high common-mode rejection ratios. Consider the external gain setting resistors to match the source impedance and desired output level. Evaluate the thermal dissipation capabilities based on the expected ambient temperature and PCB copper area available for heat spreading.

Part Context

This part belongs to the Skyworks AAT5101 series of audio amplifiers. It is designed specifically for portable consumer electronics where power efficiency and small form factor are critical. The WLCSP-9 package provides a compact solution compared to traditional surface-mount packages. It serves as a direct replacement for older Class AB amplifiers in applications where size and battery life are primary design constraints.

Replacement Considerations

No public confirmed substitute part numbers are documented in the provided datasheet.

FAQ

How is the amplifier gain configured?

The gain is set externally using input resistors (RI). The relationship is defined by Gain = 300kΩ/RI for an 8Ω load and Gain = 320kΩ/RI for a 4Ω load.

What is the function of the SHUTDOWN pin?

Applying a low level to the SHUTDOWN pin places the device in shutdown mode to minimize current consumption. An internal 300kΩ resistor pulls this pin low if no signal is applied, ensuring the device defaults to shutdown when unconnected.

Is an output filter required for operation?

No, the AAT5101 is designed for filter-less operation. However, ferrite beads may be used on the output traces to lower radiated emissions if the traces are long.