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PDF LM4990 Data sheet ( Hoja de datos )
| Número de pieza | LM4990 | |
| Descripción | 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 2004
LM4990
2 Watt Audio Power Amplifier with Selectable Shutdown
Logic Level
General Description
The LM4990 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 1.25 watts of continuous average power to an 8Ω
BTL load and 2 watts of continuous average power (LD and
MH only) to a 4Ω BTL load with less than 1% distortion
(THD+N+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 LM4990 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 LM4990 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
pin to be driven in a likewise manner to enable shutdown.
The LM4990 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4990 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Improved PSRR at 217Hz & 1KHz
j Power Output at 5.0V, 1%
THD+N,
4Ω (LD and MH only)
j Power Output at 5.0V, 1% THD+N, 8Ω
j Power Output at 3.0V, 1% THD+N, 4Ω
j Power Output at 3.0V, 1% THD+N, 8Ω
j Shutdown Current
62dB
2W (typ)
1.25W (typ)
600mW (typ)
425mW (typ)
0.1µA (typ)
Features
n Available in space-saving packages: LLP, Exposed-DAP
TSSOP, MSOP, and ITL
n Ultra low current shutdown mode
n Improved pop & click circuitry eliminates noise 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 Unity-gain stable
n External gain configuration capability
n User selectable shutdown High or Low logic Level
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
Connection Diagrams
Mini Small Outline (MSOP) Package
MSOP Marking
200510B9
Top View
Order Number LM4990MM
See NS Package Number MUA08A
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200510
20051071
Top View
Z - Plant Code
X - Date Code
TT - Die Traceability
G - Boomer Family
A5 - LM4990MM
www.national.com
1 page  
Electrical Characteristics VDD = 3V (Notes 1, 2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA =
25˚C. (Continued)
Symbol
Parameter
Conditions
Output Power (8Ω)
Po (4Ω)
TWU
Wake-up time
THD+N+N Total Harmonic Distortion+Noise
PSRR Power Supply Rejection Ratio
THD+N = 1% (max); f = 1kHz
THD+N = 1% (max); f = 1kHz
Po = 0.25Wrms; f = 1kHz
Vripple = 200mV sine p-p
Input terminated with 10Ω
LM4990
Typical
Limit
(Note 6) (Notes 7, 9)
425
600
75
0.1
62 (f =
217Hz)
55
68 (f = 1kHz)
Units
(Limits)
mW
mW
ms
%
dB (min)
Electrical Characteristics VDD = 2.6V (Notes 1, 2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
IDD
ISD
VSDIH
VSDIL
VSDIH
VSDIL
VOS
ROUT
Quiescent Power Supply Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Shutdown Voltage Input High
Shutdown Voltage Input Low
Output Offset Voltage
VIN = 0V, Io = 0A, No Load
VIN = 0V, Io = 0A, 8Ω Load
VSD = VSD Mode (Note 8)
VSD MODE = VDD
VSD MODE = VDD
VSD MODE = GND
VSD MODE = GND
Resistor Output to GND (Note 10)
Po Output Power ( 8Ω )
( 4Ω )
TWU
Wake-up time
THD+N+N Total Harmonic Distortion+Noise
PSRR Power Supply Rejection Ratio
THD+N = 1% (max); f = 1kHz
THD+N = 1% (max); f = 1kHz
Po = 0.15Wrms; f = 1kHz
Vripple = 200mV sine p-p
Input terminated with 10Ω
LM4990
Typical
Limit
(Note 6) (Notes 7, 9)
2.0
3.0
0.1
1.0
0.9
1.2
1.0
5 50
9.7
8.5
7.0
300
400
70
0.1
51 (f =
217Hz)
51 (f = 1kHz)
Units
(Limits)
mA
mA
µA
V
V
V
V
mV (max)
kΩ (max)
kΩ (min)
mW
ms
%
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 LM4990, see power derating
curves for additional information.
Note 4: Human body model, 100pF discharged through a 1.5kΩ 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: 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: RROUT is measured from the output pin to ground. This value represents the parallel combination of the 10kΩ output resistors and the two 20kΩ 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 10mA, then the device will be protected. If the device is enabled when VDD is greater than 5.5V and less than
6.5V, no damage will occur, although operation life will be reduced. Operation above 6.5V with no current limit will result in permanent damage.
Note 12: Maximum power dissipation in the device (PDMAX) occurs at an output power level significantly below full output power. PDMAX can be calculated using
Equation 1 shown in the Application Information section. It may also be obtained from the power dissipation graphs.
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Shutdown Hysteresis Voltage
VDD = 3V, SD Mode = GND
Shutdown Hysteresis Voltage
VDD = 2.6V, SD Mode = VDD
200510A3
Shutdown Hysteresis Voltage
VDD = 2.6V, SD Mode = GND
Output Power vs
Supply Voltage, RL = 4Ω
200510A4
Output Power vs
Supply Voltage, RL = 8Ω
200510A5
Output Power vs
Supply Voltage, RL = 16Ω
200510B8
200510A6
11
200510A7
www.national.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet LM4990.PDF ] | |
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