PAM8945

Document number: DS38267 Rev. 1 - 2

1 of 9

www.diodes.com

December 2015

© Diodes Incorporated

PAM8945

4.0W CLASS-G AUDIO AMPLIFIER WITH INTEGRATED

BOOST CONVERTER AND BATTERY TRACKING AGC

Description

The PAM8945 is a high efficiency Class-G audio power

amplifier with an integrated boost converter. It drives up to

4.0W (10% THD+N) into a 4

Ω speaker. With 85% typical

efficiency, the PAM8945 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 PAM8945 features battery tracking AGC function which

adjusts the amplifier gain to limit battery current at lower

battery voltage.

The PAM8945 features DC input protection and all outputs

are fully protected against output-to-output shorts. The

PAM8945 is available in tiny W-QFN3020-12 package.

Features



Built-In Battery Tracking Automatic Gain Control (AGC)



High Efficiency Integrated Boost Converter Over 85%



4.0W into a 4

Ω Load at 10% THD



3.2W into a 4

Ω Load at 1% THD



Operates from 2.8V to 5.2V



Efficient Class-G 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 2.0mm X 3.0mm 12L W-QFN Package



Totally Lead-Free & Fully RoHS Compliant (Notes 1& 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

W-QFN3020-12

Applications



Cell Phones



PDA



GPS



Portable Electronics



Speakers

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

PVDD

AGC

EN

IN+

IN-

AGND

PGND

OUT-

OUT+

BGND

SW

2

1

4

3

6

5

8

7

10

9

12

11

VBAT

5

5

5

6