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LM4804 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM4804
Description  Low Voltage High Power Audio Power Amplifier
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 4 page
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Electrical Characteristics V
DD = 3.0V (Notes 1, 2) (Continued)
The following specifications apply for V
DD = 3.0V, V1 = 6.0V, AV-BTL = 20dB, RL =8
Ω,f
IN = 1kHz, CB = 1.0µF, R1 = 301k
Ω,R
2
= 78.7k
Ω unless otherwise specified. Limits apply for T
A = 25˚C.
Symbol
Parameter
Conditions
LM4804
Units
(Limits)
Typical
(Note 6)
Limit
(Notes 7, 8)
TSD
Thermal Shutdown Temperature
125
˚C (min))
P
OUT
Output Power
THD = 2% (max)
1.8
1.65
W (min)
THD+N
Total Harmomic Distortion + Noise
P
OUT = 1.5W
0.15
0.5
%
e
OS
Output Noise
A-Weighted Filter, V
IN = 0V,
Input Referred
30
µV
PSRR
Power Supply Rejection Ratio
V
RIPPLE = 200mVp-p
f = 217Hz
f = 1kHz
73
66
dB (min)
V
FB
Feedback Pin Reference Voltage
(Note 11)
1.24
1.2772
1.2028
V (max)
V (min)
Note 1: All voltages are measured with respect to the GND 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 TJMAX, θJA, and the ambient temperature, TA. The maximum
allowable power dissipation is PDMAX =(TJMAX −TA)/ θJA or the given in Absolute Maximum Ratings, whichever is lower.
Note 4: Human body model, 100pF discharged through a 1.5k
Ω resistor.
Note 5: Machine Model, 220pF – 240pF 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: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to Vin for minimum shutdown
current.
Note 10: Shutdown current is measured with components R1 and R2 removed.
Note 11: Feedback pin reference voltage is measured with the Audio Amplifier disconnected from the Boost converter (the Boost converter is unloaded).
www.national.com
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