LM4866
2.2W Stereo Audio Amplifier
General Description
The LM4866 is a bridge-connected (BTL) stereo audio
power amplifier which, when connected to a 5V supply,
delivers 2.2W to a 4
load (Note 1) or 2.5W to a 3 load
(Note 2) with less than 1.0% THD+N.
With the LM4866 packaged in the LLP, the customer benefits
include low thermal impedance, low profile, and small size.
This package minimizes PCB area and maximizes output
power.
The LM4866 features an externally controlled, low-power
consumption shutdown mode, and thermal shutdown protec-
tion. It also utilizes circuitry to reduce "clicks and pops"
during device turn-on.
Boomer audio power amplifiers are designed specifically to
use few external components and provide high quality output
power in a surface mount package.
Note 1: An LM4866MTE or LM4866LQ that has been properly mounted to
a circuit board will deliver 2.2W into 4
. The other package options for the
LM4866 will deliver 1.1W into 8
. See the Application Information sections
for further information concerning the LM4866MTE and LM4866LQ.
Note 2: An LM4866MTE or LM4866LQ that has been properly mounted to a
circuit board will deliver 2.5W into 3
.
Key Specifications
n
P
O
at 1% THD+N
n
LM4866LQ, 3
, 4 loads
2.5W(typ), 2.2W(typ)
n
LM4866MTE, 3
, 4 loads
2.5W(typ), 2.2W(typ)
n
LM4866MTE, 8
load
1.1W(typ)
n
LM4866MT, 8
load
1.1W(typ)
n
Shutdown current
0.7A(typ)
n
Supply voltage range
2.0V to 5.5V
Features
n
Stereo BTL amplifier mode
n
"Click and pop" suppression circuitry
n
Unity-gain stable
n
Thermal shutdown protection circuitry
n
TSSOP and Exposed-DAP LLP packages
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable televisions
Typical Application
20018601
Note: Pin out shown for LLP package. Refer to the Connection Diagrams for the pinout of the TSSOP package.
Boomer
is a registered trademark of National Semiconductor Corporation.
October 2002
LM4866
2.2W
Stereo
Audio
Amplifier
2002 National Semiconductor Corporation
DS200186
www.national.com
Absolute Maximum Ratings
(Note 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
6.0V
Storage Temperature
-65C to +150C
Input Voltage
-0.3V to V
DD
+0.3V
Power Dissipation (Note 4)
Internally limited
ESD Susceptibility(Note 5)
2000V
ESD Susceptibility (Note 6)
200V
Junction Temperature
150C
Solder Information
Small Outline Package
Vapor Phase (60 sec.)
215C
Infrared (15 sec.)
220C
See AN-450 "Surface Mounting and their Effects on
Product Reliablilty" for other methods of soldering
surface mount devices.
Thermal Resistance
JC
(typ) -- MTC20
20C/W
JA
(typ) -- MTC20
80C/W
JC
(typ) -- LQ24A
3.0C/W
JA
(typ) -- LQ24A
42C/W (Note 7)
JC
(typ) -- MXA20A
2C/W
JA
(typ) -- MXA20A
41C/W (Note 8)
JA
(typ) -- MXA20A
51C/W (Note 9)
JA
(typ) -- MXA20A
90C/W (Note 10)
Operating Ratings
Temperature Range
T
MIN
T
A
T
MAX
-40C
T
A
85C
Supply Voltage
2.0V
V
DD
5.5V
Electrical Characteristics for Entire IC
(Notes 3, 11)
The following specifications apply for V
DD
= 5V unless otherwise noted. Limits apply for T
A
= 25C.
Symbol
Parameter
Conditions
LM4866
Units
(Limits)
Typical
Limit
(Note 12)
(Note 13)
V
DD
Supply Voltage
2
V (min)
5.5
V (max)
I
DD
Quiescent Power Supply Current
V
IN
= 0V, I
O
= 0A (Note 14)
11.5
20
6
mA (max)
mA (min)
I
SD
Shutdown Current
V
DD
applied to the SHUTDOWN pin
0.7
2
A (min)
Electrical Characteristics for Bridged-Mode Operation
(Notes 3, 11)
The following specifications apply for V
DD
= 5V unless otherwise specified. Limits apply for T
A
= 25C.
Symbol
Parameter
Conditions
LM4866
Units
(Limits)
Typical
Limit
(Note 12)
(Note 13)
V
OS
Output Offset Voltage
V
IN
= 0V
5
50
mV (max)
P
O
Output Power (Note 15)
THD+N = 1%, f = 1kHz (Note 16)
LM4866MTE, R
L
= 3
2.5
W
LM4866LQ, R
L
= 3
2.5
W
LM4866MTE, R
L
= 4
2.2
W
LM4866LQ, R
L
= 4
2.2
W
LM4866MT, R
L
= 8
1.1
1.0
W (min)
THD+N = 10%, f = 1kHz
LM4866MTE, R
L
= 3
3.2
W
LM4866LQ, R
L
= 3
3.2
W
LM4866MTE, R
L
= 4
2.7
W
LM4866LQ, R
L
= 4
2.7
W
LM4866MT, R
L
= 8
1.5
W
LM4866
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3
Electrical Characteristics for Bridged-Mode Operation
(Notes 3, 11) (Continued)
The following specifications apply for V
DD
= 5V unless otherwise specified. Limits apply for T
A
= 25C.
Symbol
Parameter
Conditions
LM4866
Units
(Limits)
Typical
Limit
(Note 12)
(Note 13)
THD+N
Total Harmonic Distortion+Noise
20Hz
f 20kHz, A
VD
= 2
LM4866MTE, R
L
= 4
, P
O
= 2W
LM4866LQ, R
L
= 4
, P
O
= 2W
LM4866MT, R
L
= 4
, P
O
= 1W
0.3
0.3
0.3
LM4866MT, R
L
= 8
, P
O
= 1W
0.3
%
PSRR
Power Supply Rejection Ratio
V
DD
= 5V, V
RIPPLE
= 200mV
RMS
, R
L
= 8
,
C
B
= 1.0F
67
dB
X
TALK
Channel Separation
f = 1kHz, C
B
= 1.0F
90
dB
SNR
Signal To Noise Ratio
V
DD
= 5V, P
O
= 1.1W, R
L
= 8
98
dB
Note 3: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 4: The maximum power dissipation is dictated by T
JMAX
,
JA
, and the ambient temperature T
A
and must be derated at elevated temperatures. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
- T
A
)/
JA
. For the LM4866, T
JMAX
= 150C. For the
JA
s for different packages, please see the Application
Information section or the Absolute Maximum Ratings section.
Note 5: Human body model, 100pF discharged through a 1.5k
resistor.
Note 6: Machine model, 220pF240pF discharged through all pins.
Note 7: The given
JA
is for an LM4866 packaged in an LQA24A with the exposed-DAP soldered to an exposed 2in
2
area of 1oz printed circuit board copper.
Note 8: The given
JA
is for an LM4866 packaged in an MXA20A with the exposed-DAP soldered to an exposed 2in
2
area of 1oz printed circuit board copper.
Note 9: The given
JA
is for an LM4866 packaged in an MXA20A with the exposed-DAP soldered to an exposed 1in
2
area of 1oz printed circuit board copper.
Note 10: The given
JA
is for an LM4866 packaged in an MXA20A with the exposed-DAP not soldered to prinbted circuit board copper.
Note 11: All voltages are measured with respect to the ground (GND) pins unless otherwise specified.
Note 12: Typicals are measured at 25C and represent the parametric norm.
Note 13: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 14: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.
Note 15: Output power is measured at the device terminals.
Note 16: When driving 3
or 4 loads and operating on a 5V supply, the LM4866LQ and LM4866MTE must be mounted to a circuit board that has a minimum of
2.5in
2
of exposed, uninterrupted copper area connected to the package's exposed DAP.
LM4866
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