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PDF LM4899ITL Data sheet ( Hoja de datos )
| Número de pieza | LM4899ITL | |
| Descripción | 1 Watt Fully Differential Audio Power Amplifier With Shutdown Select and Fixed 6dB Gain | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2003
LM4899
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select and Fixed 6dB Gain
General Description
The LM4899 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 1 watt of continuous average
power to an 8Ω 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 LM4899 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 LM4899 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
select pin to be driven in a likewise manner to enable Shut-
down. Additionally, the LM4899 features an internal thermal
shutdown protection mechanism.
The LM4899 contains advanced pop & click circuitry which
virtually eliminates noises which would otherwise occur dur-
ing turn-on and turn-off transitions.
The LM4899 has an internally fixed gain of 6dB.
Key Specifications
j Improved PSRR at 217Hz
j Power Output at 5.0V & 1% THD
j Power Output at 3.3V & 1% THD
j Shutdown Current
83dB
1.0W(typ.)
400mW(typ.)
0.1µA(typ.)
Features
n Fully differential amplification
n Internal-gain-setting resistors
n Available in space-saving packages micro SMD, MSOP
and LLP
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry which virtually eliminates
noises during turn-on and turn-off transitions
n 2.4 - 5.5V operation
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
n Shutdown high or low selectivity
Applications
n Mobile phones
n PDAs
n Portable electronic devices
Connection Diagrams
9 Bump micro SMD Package
9 Bump micro SMD Marking
200645A0
Top View
Order Number LM4899ITL, LM4899ITLX
See NS Package Number TLA09AAA
200645C7
X - Date Code
T - Die Run Traceability
G - Boomer Family
C1 - LM4899ITL
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200645
www.national.com
1 page  
Electrical Characteristics VDD = 3V (Notes 1, 2, 8)
The following specifications apply for VDD = 3V and 8Ω load unless otherwise specified. Limits apply for TA =
25˚C. (Continued)
Symbol
Parameter
PSRR Power Supply Rejection Ratio
CMRR
VOS
VSDIH
VSDIL
VSDIH
VSDIL
Common-Mode Rejection Ratio
Offset Voltage
Shutdown Voltage Input High
Shutdown Voltage Input Low
Shutdown Voltage Input High
Shutdown Voltage Input Low
Conditions
Vripple = 200mV sine p-p
f = 217Hz (Note 9)
f = 1kHz (Note 9)
f = 217Hz (Note 10)
f = 1kHz (Note 10)
f = 217Hz, VCM = 200mVpp
VIN = 0V
SD Mode = GND
SD Mode = GND
SD Mode = VDD
SD Mode = VDD
LM4899
Typical
Limit
(Note 6)
(Note 7)
83
84
83
83
50
2
0.8
0.6
0.8
0.6
Units
(Limits)
dB
dB
mV
V
V
V
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 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 LM4899, see power derating
currents 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: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
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: Unterminated input.
Note 10: 10Ω terminated input.
Note 11: : When driving 4Ω loads from a 5V power supply, the LM4899LD must be mounted to a circuit board with the exposed-DAP area soldered down to a 1sq.
in plane of 1oz. copper.
External Components Description (Figure 1)
Components
1. CS
2. CB
Functional Description
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 CB.
5 www.national.com
5 Page 
Typical Performance Characteristics
Non-LD Specific Characteristics (Continued)
CMRR vs Frequency
VDD = 5V, RL = 8Ω, 200mVpp
CMRR vs Frequency
VDD = 3V, RL = 8Ω, 200mVpp
200645A3
PSRR vs Common Mode Voltage
VDD = 5V
200645A2
PSRR vs Common Mode Voltage
VDD = 3V, RL = 8Ω, 217Hz, 200mVpp
200645A8
200645A7
11 www.national.com
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