PAM8403DR-H

Overview

The PAM8403DR-H is a filterless 3W Class-D stereo audio amplifier manufactured by Diodes Incorporated. It operates within a supply voltage range of 2.5V to 5.5V and delivers up to 3.2W output power at 10% THD+N with a 4Ω load at 5V. The device features low quiescent current (16mA typical), high efficiency up to 90%, and low total harmonic distortion plus noise (0.15%). It includes short circuit protection, thermal shutdown, and mute/shutdown control pins. The component is housed in an SOP-16 package.

Feature Summary

• Filterless architecture eliminates the need for external low-pass output filters, reducing system cost and PCB area.
• High efficiency up to 90% extends battery life in portable applications compared to Class-AB amplifiers.
• Integrated short circuit protection and thermal shutdown prevent damage during fault conditions.
• Low quiescent current and low electromagnetic interference (EMI) support efficient operation.

Applications

• LCD Monitors / TV Projectors
• Notebook Computers
• Portable Speakers
• Portable DVD Players, Game Machines
• Cellular Phones/Speaker Phones

Procurement Notes

Verify the specific ordering suffix 'H' against the manufacturer's official documentation, as datasheets may list standard variants like PAM8403DR. Confirm the product status, as this series is marked not recommended for new design with potential obsolescence. Ensure compliance with RoHS requirements and check for moisture sensitivity levels before procurement.

Selection Notes

Select this component for stereo audio applications requiring high efficiency and minimal external components. Verify that the load impedance matches the specified 4Ω or 8Ω configurations for desired power output. Consider the SOP-16 package constraints and ensure adequate thermal management given the junction-to-ambient thermal resistance. Check input signal levels to avoid clipping due to the fixed gain.

Part Context

The PAM8403 is part of Diodes Incorporated's portfolio of Class-D audio amplifiers designed for portable electronics. It serves as a high-efficiency alternative to linear amplifiers, offering superior sound quality with low distortion. The device integrates analog reference bypass and protection circuits, simplifying the design process for manufacturers of mobile audio devices.

Replacement Considerations

The datasheet explicitly recommends using the PAM8406 as a replacement for new designs. Verify pin compatibility and electrical specifications between the PAM8403 and PAM8406 before substitution.

FAQ

What is the function of the MUTE pin?

The MUTE pin controls the output state; a logic low disables the outputs, while a logic high enables them. It allows quick disable/enable without volume fade and has an internal pull-up.

How does the Shutdown feature work?

Applying a logic low to the SHDN pin turns off the amplifier's bias circuitry to minimize supply current in idle mode. The pin also has an internal pull-up and can be left floating.

What protection mechanisms are included?

The PAM8403 includes short circuit protection on the outputs and over-temperature protection that disables outputs if the die temperature exceeds +140°C, clearing automatically when the temperature drops by 30°C.