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PDF LM4902LD Data sheet ( Hoja de datos )
| Número de pieza | LM4902LD | |
| Descripción | 265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 2002
LM4902
265mW at 3.3V Supply Audio Power Amplifier with
Shutdown Mode
General Description
The LM4902 is a bridged audio power amplifier capable of
delivering 265mW of continuous average power into an 8Ω
load with 1% THD+N from a 3.3V power supply.
Boomer® audio power amplifiers were designed specifically
to provide high quality output power from a low supply volt-
age while requiring a minimal amount of external compo-
nents. Since the LM4902 does not require output coupling
capacitors, bootstrap capacitors or snubber networks, it is
optimally suited for low-power portable applications.
The LM4902 features an externally controlled, low power
consumption shutdown mode, and thermal shutdown protec-
tion.
The closed loop response of the unity-gain stable LM4902
can be configured by external gain-setting resistors.
Key Specifications
j THD+N at 1kHz for 265mW continuous
average output power into 8Ω,
VDD = 3.3V
1.0% (max)
j THD+N at 1kHz for 675mW continuous
average output power into 8Ω,
VDD = 5V
j Shutdown current
1.0% (max)
0.1µA (typ)
Features
n MSOP and LLP packaging
n No output coupling capacitors, bootstrap capacitors, or
snubber circuits are necessary
n Thermal shutdown protection circuitry
n Unity-gain stable
n External gain configuration capability
n Latest generation ’click and pop’ suppression circuitry
Applications
n Cellular phones
n PDA’s
n Any portable audio application
Typical Application
20029801
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS200298
www.national.com
1 page  
External Components Description
(Figure 1)
Components
1. Ri
2. Ci
3. RF
4. CS
5. CB
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor also forms a
high pass filter with Ci at fc = 1/(2π RiCI).
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
highpass filter with Ri at fc = 1/(2π RiCi). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the value of Ci.
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
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 Proper Selection of External
Components for information concerning proper placement and selection of CB.
Typical Performance
Characteristics
THD+N vs Frequency
THD+N vs Frequency
THD+N vs Frequency
20029830
THD+N vs Frequency
20029831
20029832
5
20029833
www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
20029863
Power Supply
Rejection Ratio
20029864
Power Supply Rejection Ratio
vs Supply Voltage
20029865
Power Supply Rejection Ratio
vs Supply Voltage
20029866
20029867
11
20029868
www.national.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LM4902LD.PDF ] | |
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