AudioMAX
T
H E
TM
LX1720
D
A T A
S
WITCHING
C
LASS
-D, S
TEREO
P
OWER
A
MPLIFIER
C
ONTROLLER
IC
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
S
H E E T
DESCRIPTION
The
LX1720
is a highly-integrated,
Switching Class-D Stereo Power Am-
plifier Controller IC
with power and
size features that make it ideal for multi-
media computer applications, as well as
other applications where high fidelity
sound is required.
With input voltage ranging from 7V-
15V, the LX1720 is designed to operate
over the full 20Hz to 20kHz audio range.
Signal distortion measurements using
industry standard 1kHz signal yields THD
+ noise levels < 1% (10 watts output).
Its high efficiency (>92%) eliminates the
need for heat sinks 鈥?even while deliv-
ering more than 10W
RMS
across 8 ohms
per channel (20W
RMS
stereo) with 0.1 ohm
SO-8 power FETs.
The LX1720's output power is limited
only by external FETs and available sup-
ply voltage.
While offering breakthrough perfor-
mance capabilities for notebooks, the
LX1720 is equally attractive for multime-
dia systems or to drive full-size home
theatre speakers.
K E Y F E AT U R E S
s
Integrated Switching (Class-D) Stereo
Power Amplifier Controller IC
s
Delivers >10W
RMS
Across 8鈩?/Channel
(20W
RMS
stereo)
s
Output Power Limited Only By External
FETs And Available Supply Voltage
s
Will Drive A Wide Range Of Speakers
s
High Efficiency (>92%)
s
Due To High Efficiency, Power FETs Do Not
Require Heatsinking
s
Audio Bandwidth Of 20Hz to 20kHz
s
Wide Input Voltage Range Of 7V-15V
s
Low Output Signal Distortion <1%
s
High Operating Frequency (350kHz) Helps
To Reduce Output Filter Size
s
Compact Design Minimizes EMI / RFI
IMPORTANT:
For the most current data, consult LinFinity's web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
APPLICATIONS / BENEFITS
E
F F I C I E N C Y
C
O M PA R I S O N
100
OF THE
C
LASS
-D A
MPLFIER
Notebook Computers:
s
Replaces existing internal low power linear
amplifier with a high efficiency Class-D
amplifier
s
Enables the use of virtually any external
speaker without amplification
s
Precious battery life is extended
s
Fully protected power topology can
withstand shorts or external speaker
failures without damage, overheating or
posing fire hazard
- Average Power Out for 20sec. approx. 512mW
- Across 8.6 Ohm Load
80
Linfinity's LX1720
Class-D Amplifier
Efficiency (%)
60
Desktop Computers:
s
Output power capability of up to 20W
RMS
per channel in an area less than 3"x3",
without using expensive heatsinks
s
Greatly reduced power supply
requirements when compared to a linear
solution of same power capabilities
s
Any speakers can be used including
conventional home stereo speakers
s
Very light weight circuitry will not add to
the overall weight of the system
s
Multimedia amplifier can be directly
incorporated on the motherboard using
surface mount components
40
20
Highly Integrated
Linear Amplifier
0
0
5
10
15
20
APPLICATION NOTE
AN-11
available on our web site
or call 1-800-LMI-7011
Audio sample from "Hold On Tight"
by Electric Light Orchestra
Seconds
PA C K A G E O R D E R I N F O
T
J
(擄C)
0 to 70
Maximum
DB
Plastic SSOP
44-pin
VDD
15V
LX1720-01CDB
Note: Available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX1720-01CDBT)
Copyright 漏 1999
Rev. 1.0 9/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
1
2
3
4
5
6
