lm4889ld National Semiconductor Corporation, lm4889ld Datasheet - Page 4

• Manufacturer Part Number: lm4889ld
• Description: 1 Watt Audio Power Amplifier
• Manufacturer: National Semiconductor Corporation

www.national.com
I
I
P
THD+N
PSRR
DD
SD
Symbol
0
Electrical Characteristics V
The following specifications apply for V
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: 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 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
currents for additional information.
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 5: Machine Model, 220 pF–240 pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I
Note 9: Datasheet min/max specification limits are guaranteed by design, test or statistical analysis.
Note 10: All bumps have the same thermal resistance and contribute equally when used to lower thermal resistance. The LM4889ITL demo board (views featured
in the Application Information section) has two inner layers, one for V
and aid in spreading heat due to power dissipation within the IC.
External Components Description
Components
( Figure 1 )
1.
2.
3.
4.
5.
Quiescent Power Supply Current
Shutdown Current
Output Power ( 8Ω )
Output Power ( 4Ω )
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
C
C
R
R
C
S
B
i
i
f
Inverting input resistance which sets the closed-loop gain in conjunction with R
high pass filter with C
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with R
for an explanation of how to determine the value of C
Feedback resistance which sets the closed-loop gain in conjunction with R
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External
Components, for information concerning proper placement and selection of C
Parameter
DMAX
= (T
JMAX
–T
A
i
DD
)/θ
i
at f
at f
JA
= 2.6V, A
c
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4889, see power derating
C
= 1/(2π R
= 1/(2π R
DD
V
V
V
THD = 1% (max); f = 1 kHz
THD = 1% (max); f = 1 kHz
P
V
f
f
ripple
ripple
IN
IN
shutdown
o
ripple
= 0.1Wrms; f = 1kHz
= 2.6V
= 0V, I
= 0V, I
V
= 217Hz
= 1kHz
= 200mV sine p-p
= 2, and 8Ω load unless otherwise specified. Limits apply for T
i
i
C
C
DD
i
= GND (Note 8)
i
). Refer to the section, Proper Selection of External Components,
).
o
o
and one for GND. The planes each measure 600mils x 600mils (15.24mm x 15.24mm)
Conditions
= 0A, no Load
= 0A, with BTL Load
Functional Description
4
(Notes 1, 2)
i
.
JMAX
, θ
JA
(Note 6)
Typical
, and the ambient temperature T
0.01
0.22
0.08
2.6
3.0
0.2
44
44
i
. A
LM4889
VD
B
f
. This resistor also forms a
.
= 2
(Notes 7, 9)
*
(R
Limit
6
6
1
f
SD
/R
i
by a maximum of 2µA.
).
A
. The maximum
A
mA (max)
mA (max)
µA (max)
(Limits)
= 25˚C.
Units
dB
dB
W
W
%