Download A better Class-D amplifi er for mobile and wired applications

NXP 3.0-W mono,
filter-free, Class-D audio
power amplifier SA58672UK
A better Class-D amplifier
for mobile and wired applications
This small, highly efficient Class-D audio amplifier saves space and extends battery life in a wide
range of portable and wired applications, from mobile handsets to gas-station pumps
Key features
Ñ Output power
- 3.0 W at 5 V into 4 Ω
- 1.7 W at 5 V into 8 Ω
- 800 mW at 3.6 V into 8 Ω
Ñ Power supply range: 2.5 to 5.5 V
Ñ Efficiency at 3.6 V with an 8 Ω speaker: 89 % at 400 mW
Ñ Shutdown control
Ñ Low supply current
Ñ High PSSR: -93 dB eliminates need for voltage regulator
Ñ Unique modulation scheme reduces EMI emissions
Ñ Excellent immunity to noise
Ñ Fully differential design reduces RF rectification and
eliminates bypass capacitor
Ñ Improved CMRR eliminates two input coupling capacitors
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
In cellular handsets, the earpiece, speaker phone, and melody
ringer can all be driven by the SA58672UK. The gain is
externally configurable, so it’s possible to have independent
gain control from multiple sources by summing signals from
separate sources.
Integrated Pop & Click suppression circuitry
Fast start-up time: 7 ms
Thermal and short-circuit shutdown protection
Tiny WCSP package (1.66 x 1.71 mm)
RoHS compliant and 100 % lead (Pb)-free
Notebook PCs
POS terminals
USB speakers
Educational toys
Gas-station pumps
Industrial applications
Designed for use in a wide range of portable and wired
applications, the NXP Class-D audio amplifier SA58672UK
delivers highly efficient operation in a small form factor. The
low noise, filterless PWM architecture eliminates the output
filter, reducing external component count and lowering system
cost. The maximum power efficiency is excellent: 88 to 90 %
into 8 Ω, and 84 to 88 % into 4 Ω.
Applications
Ñ Mobile handsets
Ñ PDAs
Ñ PNDs and GPS devices
Ñ Portable DVD players
Ñ LCD TVs
1063 NXP SA58672 v3.indd 1
04-08-2008 12:50:08
Using a 5-V power supply, the maximum output power with
a 4-Ω load is 3.0 W; with an 8-Ω load the maximum is 1.7 W.
Using a 3.6-V power supply, the maximum output power is
900 mW into an 8-Ω load.
To save space in portable designs, the SA58672UK uses a
9-bump Wafer Level Chip Scale Package (WLCSP) that
measures only 1.66 x 1.71 x 0.6 mm.
The improved immunity to noise and RF rectification results in
better overall audio performance.
The fast start-up time of 7 ms eliminates pop-on sounds and
makes the SA58672UK ideal for wireless or cellular handsets
and other portable audio applications.
SA58672UK evaluation board
BATTERY
#3
06$$!6$$
2F
POSITIVE
DIFFERENTIAL
INPUT
2I
).0
/540
BYPASS
60
BYPASS
INTERNALBIASING
NEGATIVE
DIFFERENTIAL
INPUT
2I
).-
07-
("2)$'%
/54-
BYPASS
2F
K7
2,7
3(54$/7.
#/.42/,
6)(
).4%2.!,
/3#),,!4/2
!'.$0'.$
AAD
6), 3$
SA58672UK block diagram
www.nxp.com
© 2008 NXP B.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
Date of release: August 2008
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and
Document order number: 9397 750 16197
reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
Printed in the Netherlands
Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
1063 NXP SA58672 v3.indd 2
04-08-2008 12:50:14