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PDF LM4674 Data sheet ( Hoja de datos )
| Número de pieza | LM4674 | |
| Descripción | Filterless 2.5W Stereo Class D Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4674 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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www.DataSheet4U.com
December 2005
LM4674
Filterless 2.5W Stereo Class D Audio Power Amplifier
General Description
The LM4674 is a single supply, high efficiency, 2.5W/
channel, filterless switching audio amplifier. A low noise
PWM architecture eliminates the output filter, reducing ex-
ternal component count, board area consumption, system
cost, and simplifying design.
The LM4674 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing from a single 5V supply, the device is capable of deliv-
ering 2.5W/channel of continuous output power to a 4Ω load
with less than 10% THD+N. Flexible power supply require-
ments allow operation from 2.4V to 5.5V.
The LM4674 features high efficiency compared to conven-
tional Class AB amplifiers. When driving and 8Ω speaker
from a 3.6V supply, the device features 85% efficiency at PO
= 500mW. Four gain options are pin selectable through the
GAIN0 and GAIN1 pins.
Output short circuit protection prevents the device from be-
ing damaged during fault conditions. Superior click and pop
suppression eliminates audible transients on power-up/down
and during shutdown. Independent left/right shutdown con-
trols maximizes power savings in mixed mono/stereo appli-
cations.
Key Specifications
j Efficiency at 3.6V, 100mW into 8Ω
j Efficiency at 3.6V, 500mW into 8Ω
j Efficiency at 5V, 1W into 8Ω
j Quiescent Power Supply Current
at 3.6V supply
j Power Output at VDD = 5V,
RL = 4Ω, THD ≤ 10%
j Power Output at VDD = 5V,
RL = 8Ω, THD ≤ 10%
j Shutdown current
80% (typ)
85% (typ)
85% (typ)
4mA
2.5W (typ)
1.5W (typ)
0.1µA (typ)
Features
n Output Short Circuit Protection
n Stereo Class D operation
n No output filter required
n Logic selectable gain
n Independent shutdown control
n Minimum external components
n Click and Pop suppression
n Micro-power shutdown
n Available in space-saving 2mm x 2mm x 0.6mm micro
SMD package
Applications
n Mobile phones
n PDAs
n Laptops
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201674
www.national.com
1 page  
Electrical Characteristics VDD = 3.6V (Notes 1, 2)
The following specifications apply for AV = 6dB, RL = 15µH + 8Ω + 15µH, f = 1kHz unless otherwise specified. Limits apply for
TA = 25˚C. (Continued)
Symbol
Parameter
PO Output Power
THD+N Total Harmonic Distortion
PSRR Power Supply Rejection Ratio
CMRR Common Mode Rejection Ratio
η
SNR
eOS
Efficiency
Crosstalk
Signal to Noise Ratio
Output Noise
Conditions
RL = 15µH + 4Ω + 15µH, THD = 10%
f = 1kHz, 22kHz BW
VDD = 5V
VDD = 3.6V
VDD = 2.5V
RL = 15µH + 8Ω + 15µH, THD = 10%
f = 1kHz, 22kHz BW
VDD = 5V
VDD = 3.6V
VDD = 2.5V
RL = 15µH + 4Ω + 15µH, THD = 1%
f = 1kHz, 22kHz BW
VDD = 5V
VDD = 3.6V
VDD = 2.5V
RL = 15µH + 8Ω + 15µH, THD = 1%
f = 1kHz, 22kHz BW
VDD = 5V
VDD = 3.6V
VDD = 2.5V
PO = 500mW, f = 1kHz, RL = 8Ω
PO = 300mW, f = 1kHz, RL = 8Ω
VRIPPLE = 200mVP-P Sine,
fRipple = 217Hz, Inputs AC GND, CI
= 1µF, input referred
VRIPPLE = 1VP-P Sine,
fRipple = 1kHz, Inputs AC GND, CI =
1µF, input referred
VRIPPLE = 1VP-P
fRIPPLE = 217Hz
PO = 1W, f = 1kHz,
RL = 8Ω, VDD = 5V
PO = 500mW, f = 1kHz
VDD = 5V, PO = 1W
Input referred, A-Weighted Filter
LM4674
Typical
Limit
(Note 6)
(Note 7)
2.5
1.2
0.530
1.5
0.78
0.350
0.6
1.9
1
0.430
1.25
0.63
0.285
0.07
0.05
75
75
67
85
84
96
20
Units
(Limits)
W
W
W
W
%
dB
dB
%
dB
dB
µV
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 LM4674 see power derating
currents for more 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).
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Power Dissipation vs. Output Power
RL = 4Ω, f = 1kHz
Power Dissipation vs. Output Power
RL = 8Ω, f = 1kHz
20167451
Output Power vs. Supply Voltage
RL = 4Ω, f = 1kHz
20167452
Output Power vs. Supply Voltage
RL = 8Ω, f = 1kHz
20167453
PSRR vs. Frequency
VDD = 3.6V, VRIPPLE= 200mVP-P, RL = 8Ω
20167454
Crosstalk vs. Frequency
VDD = 3.6V, VRIPPLE = 1VP-P, RL = 8Ω
20167455
11
20167422
www.national.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LM4674.PDF ] | |
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