PAM8905 Datasheet, PDF (1/9 Pages) Diodes Incorporated – 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC

A Product Line of
Diodes Incorporated
1.9W Class-D Audio Amplifier with Integrated
Boost Converter and Battery Tracking AGC
PAM8905
Description
Pin Assignments
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.
1
2
3
A
PVDD
SW
B G ND
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.
B OUT+
AGC
VBAT
C
O UT-
EN
IN+
D
PGND AGND
IN-
(TOP VIEW)
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%

1.9W 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
Applications
 Cell Phones
 PDA
 GPS
 Portable Electronics
 Speakers
Typical Applications Circuit
2.8V to 5.2V
VBAT
10uF
Audio Input
AGC
2.2uH
VBAT
EN
IN+
IN-
AGC
AGND
SW PVDD
AGND
OUT+
OU T-
PGND
10uF ~22uF
PAM8905
Document number: DS37026 Rev. 2 - 2
1 of 9
www.diodes.com
May 2015
© Diodes Incorporated