LM4991 Datasheet, PDF (4/15 Pages) National Semiconductor (TI) – 3W Audio Power Amplifier with Shutdown Mode

Electrical Characteristics V_DD = 3V (Notes 2, 3)
The following specifications apply for V_DD = 3V and R_L = 8Ω unless otherwise specified. Limits apply for T_A =
25˚C. (Continued)
Symbol
Parameter
PSRR
Power Supply Rejection
Ratio
Conditions
V_RIPPLE = 200mV sine p-p,
Input terminated with 10Ω,
f = 1kHz
LM4991
Typical
Limit
(Note 7)
(Note 8)
68
Units
(Limits)
dB
Electrical Characteristics V_DD = 2.6V (Notes 2, 3)
The following specifications apply for V_DD = 2.6V and R_L = 8Ω unless otherwise specified. Limits apply for T_A = 25˚C.
Symbol
Parameter
Conditions
I_DD
I_SD
V_SDIH
V_SDIL
V_OS
P_o
THD+N
PSRR
Quiescent Power Supply
Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Output Offset Voltage
Output Power
Total Harmonic
Distortion+Noise
Power Supply Rejection
Ratio
V_IN = 0V, no Load
V_IN = 0V, R_L = 8Ω
V_SHUTDOWN = V_DD
THD = 1% (max), f = 1kHz
R_L = 4Ω
R_L = 8Ω
P_O = 0.15W, f = 1kHz
V_RIPPLE = 200mV sine p-p,
Input terminated with 10Ω,
f = 1kHz
LM4991
Typical
Limit
(Note 7)
(Note 8)
2
3
0.1
1
0.9
5
35
400
300
0.1
Units
(Limits)
mA (max)
µA(max)
V
V
mV (max)
mW
%
51
dB
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: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T_JMAX, θ_JA, and the ambient temperature T_A. The maximum
allowable power dissipation is P_DMAX = (T_JMAX–T_A)/θ_JA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4991, T_JMAX = 150˚C.
For the θ_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 1.5kΩ resistor.
Note 6: Machine Model, 220pF–240pF discharged through all pins.
Note 7: Typicals are specified at 25˚C and represent the parametric norm.
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9: The given θ_JA is for an LM4991 packaged in an LDC08A with the Exposed–DAP soldered to an exposed 1in² area of 1oz printed circuit board copper.
Note 10: When driving 3Ω or 4Ω loads from a 5V supply, the LM4991LD must be mounted to a circuit board.
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