PAM8945PJR

Overview

The PAM8945PJR is a Class-G audio power amplifier manufactured by Diodes Incorporated, housed in a W-QFN2030-12 package. It delivers up to 4.0W output power into a 4Ω load at 10% THD+N and 3.2W at 1% THD+N. The device operates on a supply voltage range of 2.8V to 5.2V with a typical efficiency exceeding 85%. Key electrical characteristics include a quiescent current of 4mA, a shutdown current of 1μA maximum, and a switching frequency of 1200kHz for the integrated boost converter.

Feature Summary

• Integrated boost converter generates an internal voltage rail to maximize audio output loudness while maintaining consistent volume regardless of battery voltage levels.
• Built-in battery tracking automatic gain control (AGC) dynamically adjusts amplifier gain to limit battery current draw during low voltage conditions.
• Comprehensive protection mechanisms include DC input protection, auto-recovery short-circuit protection between outputs, and thermal shutdown functionality.
• Optimized for high-efficiency operation with minimized ON/OFF pop noise and superior low noise performance to extend battery life.

Applications

• Cell phones
• Portable electronics
• GPS devices
• Speakers

Procurement Notes

Verify that the component matches the specific Diodes Incorporated datasheet DS38267 Rev. 3 - 2. Confirm the package type is W-QFN2030-12 and the ordering suffix corresponds to Tape & Reel packaging. Ensure compliance with RoHS 3 and Halogen-free requirements as specified in the manufacturer's documentation before finalizing procurement specifications.

Selection Notes

Select this component when designing mono audio systems requiring high efficiency and extended battery life from a single-cell lithium-ion source. The integrated boost converter eliminates the need for external inductors in some configurations, though external components are required for optimal performance. Consider the 2.0mm x 3.0mm footprint for space-constrained portable applications where Class-G topology provides superior power delivery compared to standard Class-D amplifiers.

Part Context

The PAM8945 belongs to the PAM8945 series of audio amplifiers produced by Diodes Incorporated. This series focuses on high-efficiency Class-G technology designed specifically for mobile and portable consumer electronics. The PAM8945PJR variant represents the specific tape-and-reel packaged version of this amplifier, intended for automated surface-mount assembly processes.

Replacement Considerations

Public confirmed substitute part numbers: None identified in official documentation.

FAQ

How does the AGC function affect the amplifier's performance?

The battery tracking AGC adjusts the amplifier gain to limit battery current at lower battery voltages, ensuring stable operation and preventing excessive drain during peak audio demands.

What protection features are included in the PAM8945?

The device includes DC input protection, auto-recovery short-circuit protection against output-to-output shorts, and thermal shutdown to safeguard the component under fault conditions.