PAM8905

Document number: DS37026 Rev. 2 - 2

1 of 9

www.diodes.com

May 2015

© Diodes Incorporated

PAM8905

A Product Line of

Diodes Incorporated

1.9W Class-D Audio Amplifier with Integrated

Boost Converter and Battery Tracking AGC

Description

The PAM8905 is a high efficiency Class-D audio power amplifier with

an integrated boost converter. It drives up to 1.9W (1% THD+N) into

an

8Ω speaker. With 85% typical efficiency, the PAM8905 helps

extend battery life when playing audio.

The built-in boost converter generates the voltage rail for the output

stage. This provides a louder audio output than a stand-alone

amplifier connected directly to the battery. It also maintains a

consistent loudness, regardless of battery voltage.

The PAM8905 features battery tracking AGC function which adjusts

the Class-D gain to limit battery current at lower battery voltage.

PAM8905 features DC input protection and all outputs are fully

protected against output-to-output shorts. The PAM8905 is available

in U-WLB1520-12 package.

Features



Built-In Battery Tracking Automatic Gain Control (AGC)



High Efficiency Integrated Boost Converter Over 85%



1.9

W into an 8Ω Load from a 3.6V Supply



Operates from 2.8V to 5.2V



Efficient Class-D Prolongs Battery Life



Minimized ON/OFF Pop Noise



Superior Low Noise



High PSRR



DC Input Protection



Auto-Recovery Short-Circuit Protection



Thermal Shutdown



Available in U-WLB1520-12 Package

Pin Assignments

PVDD

SW

OUT +

OUT-

EN

BGND

PGND

AGND

IN-

B

C

D

1

2

3

AGC

IN+

A

(TOP VIEW)

Applications



Cell Phones



PDA



GPS



Portable Electronics



Speakers

Typical Applications Circuit

2.8V to 5.2V

2.2uH

SW

PVDD

10uF~22uF

AGND

AGND

PGND

OUT+

OUT-

AGC

IN+

IN-

Audio Input

EN

AGC

10uF