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Diodes Semiconductor Electronic Components Datasheet

PAM8905 Datasheet

1.9W Class-D Audio Amplifier

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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 speaker. With 85% typical efficiency, the PAM8905 helps
extend battery life when playing audio.
12 3
A PVDD SW BGND
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 OUT-
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


Diodes Semiconductor Electronic Components Datasheet

PAM8905 Datasheet

1.9W Class-D Audio Amplifier

No Preview Available !

Pin Descriptions
A Product Line of
Diodes Incorporated
1.9W Class-D Audio Amplifier with Integrated
Boost Converter and Battery Tracking AGC
PAM8905
Pin Name
PVDD
OUT+
OUT-
PGND
SW
AGC
EN
AGND
BGND
VBAT
IN+
IN-
Pin Number
A1
B1
C1
D1
A2
B2
C2
D2
A3
B3
C3
D3
Description
Boost Converter Output and Class D Amplifier Power Supply
Amplifier Positive Audio Output
Amplifier Negative Audio Output
Class-D Power Ground
Boost Convertor Switching
AGC Inflection Point Select
Connect to VBAT, GND or Float. Voltage at AGC pin is only read at device power-up.
A power cycle is required to change inflection points.
Device Enable
Set to logic high to enable
Analog Ground
Boost Converter Power Ground
Supply Voltage
Positive Audio Input
Negative Audio Input
Block Diagram
EN
IN+
IN-
AGC
Bias
VBAT
SW
Boost Convertor
AGC
+
-
PWM
Modulator
UVLO
VREF
OSC
Gate
Drive
Gate
Drive
SCP
OTP
DCP
Startup
Pr otec ti on
PVDD
OUT+
OU T-
AGND
BGND
PGND
PAM8905
Document number: DS37026 Rev. 2 - 2
2 of 9
www.diodes.com
May 2015
© Diodes Incorporated


Part Number PAM8905
Description 1.9W Class-D Audio Amplifier
Maker Diodes
Total Page 9 Pages
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