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PDF LM4890MM Data sheet ( Hoja de datos )
| Número de pieza | LM4890MM | |
| Descripción | 1 Watt Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2003
LM4890
1 Watt Audio Power Amplifier
General Description
The LM4890 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other por-
table communication device applications. It is capable of
delivering 1 watt of continuous average power to an 8Ω BTL
load with less than 1% distortion (THD+N) from a 5VDC
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4890 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4890 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4890 features an internal ther-
mal shutdown protection mechanism.
The LM4890 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4890 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j PSRR at 217Hz, VDD = 5V (Fig. 1)
j Power Output at 5.0V & 1% THD
j Power Output at 3.3V & 1% THD
j Shutdown Current
62dB(typ.)
1W(typ.)
400mW(typ.)
0.1µA(typ.)
Features
n Available in space-saving packages: micro SMD, MSOP,
SOIC, and LLP
n Ultra low current shutdown mode
n BTL output can drive capacitive loads
n Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
n Thermal shutdown protection
n Unity-gain stable
n External gain configuration capability
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
Connection Diagrams
8 Bump micro SMD
8 bump micro SMD Marking
20019223
Top View
Order Number LM4890IBP, LM4890IBPX
See NS Package Number BPA08DDB
20019270
Top View
X - Date Code
T - Die Traceability
G - Boomer Family
E - LM4890IBP
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200192
www.national.com
1 page  
Electrical Characteristics VDD = 3V (Notes 1, 2, 8)
The following specifications apply for the circuit shown in Figure 1 unless otherwise specified. Limits apply for TA =
25˚C. (Continued)
Symbol
Parameter
Po Output Power ( 8Ω )
TSD Thermal Shutdown Temperature
THD+N
PSRR
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
(Note 14)
Conditions
THD = 1% (max); f = 1kHz
Po = 0.15Wrms; f = 1kHz
Vripple = 200mV sine p-p
Input terminated with 10 ohms to
ground
LM4890
Typical
Limit
(Note 6) (Notes 7, 9)
0.31
0.28
150
170
190
0.1
56 (f =
217Hz)
45
62 (f = 1kHz)
Units
(Limits)
W
˚C(min)
˚C(max)
%
dB(min)
Electrical Characteristics VDD = 2.6V (Notes 1, 2, 8)
The following specifications apply for for the circuit shown in Figure 1 unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
IDD
ISD
P0
THD+N
PSRR
Quiescent Power Supply Current
Shutdown Current
Output Power ( 8Ω )
Output Power ( 4Ω )
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
(Note 14)
Conditions
VIN = 0V, Io = 0A, No Load
VSHUTDOWN = 0V
THD = 1% (max); f = 1 kHz
THD = 1% (max); f = 1 kHz
Po = 0.1Wrms; f = 1kHz
Vripple = 200mV sine p-p
Input Terminated with 10 ohms to
ground
LM4890
Typical
Limit
(Note 6) (Notes 7, 9)
2.6
0.1
0.2
0.22
0.08
44 (f =
217Hz)
44 (f = 1kHz)
Units
(Limits)
mA (max)
µA (max)
W
W
%
dB
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 TJMAX, θJA, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX = (TJMAX–TA)/θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4890, see power derating
curves 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 ISD by a maximum of 2µA.
Note 9: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 10: ROUT is measured from each of the output pins to ground. This value represents the parallel combination of the 10k ohm output resistors and the two 20k
ohm resistors.
Note 11: If the product is in shutdown mode and VDD exceeds 6V (to a max of 8V VDD), then most of the excess current will flow through the ESD protection circuits.
If the source impedance limits the current to a max of 10 ma, then the part will be protected. If the part is enabled when VDD is greater than 5.5V and less than 6.5V,
no damage will occur, although operational life will be reduced. Operation above 6.5V with no current limit will result in permanent damage.
Note 12: All bumps have the same thermal resistance and contribute equally when used to lower thermal resistance. All bumps must be connected to achieve
specified thermal resistance.
Note 13: Maximum power dissipation (PDMAX) in the device occurs at an output power level significantly below full output power. PDMAX can be calculated using
Equation 1 shown in the Application section. It may also be obtained from the power dissipation graphs.
Note 14: PSRR is a function of system gain. Specifications apply to the circuit in Figure 1 where AV = 2. Higher system gains will reduce PSRR value by the amount
of gain increase. A system gain of 10 represents a gain increase of 14dB. PSRR will be reduced by 14dB and applies to all operating voltages.
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
PSRR vs DC Output Voltage
VDD = 5V, AV = 2
PSRR vs DC Output Voltage
VDD = 5V, AV = 4
PSRR vs DC Output Voltage
VDD = 5V, AV = 10
20019296
PSRR vs DC Output Voltage
VDD = 3V, AV = 2
20019297
PSRR vs DC Output Voltage
VDD = 3V, AV = 4
200192A3
PSRR vs DC Output Voltage
VDD = 3V, AV = 10
20019294
20019295
200192A4
11 www.national.com
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