PAM8945 Datasheet, PDF (1/9 Pages) Diodes Incorporated – 4.0W CLASS-G AUDIO AMPLIFIER WITH INTEGRATED

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 4Ω 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 4Ω Load at 10% THD
 3.2W into a 4Ω 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)
BGND SW
PVDD 1
12 11
OUT+ 2
OUT- 3
PGND 4
Applications
5^{5 5}
6^{5 6}
AGND IN-
W-QFN3020-12
 Cell Phones
 PDA
 GPS
 Portable Electronics
 Speakers
10 VBAT
9 AGC
8 EN
7 IN+
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.
PAM8945
Document number: DS38267 Rev. 1 - 2
1 of 9
www.diodes.com
December 2015
© Diodes Incorporated