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LM4906MM 데이터시트 PDF




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부품번호 LM4906MM 기능
기능 1W/ Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain
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LM4906MM 데이터시트, 핀배열, 회로
May 2003
LM4906
1W, Bypass-Capacitor-less Audio Amplifier with Internal
Selectable Gain
General Description
The LM4906 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 1W of continuous average power to an 8BTL
load with less than 1% distortion (THD+N) from a +5V power
supply.
The LM4906 is the first National Semiconductor Boomer
Power Amplifier that does not require an external PSRR
bypass capacitor. The LM4906 also has an internal select-
able gain of either 6dB or 12dB. In addition, no output
coupling capacitors or bootstrap capacitors are required
which makes the LM4906 ideally suited for cell phone and
other low voltage portable applications.
The LM4906 contains advanced pop and click circuitry that
eliminates noise, which would otherwise occur during
turn-on and turn-off transitions.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4906 features a low -power
consumption shutdown mode (the part is enabled by pulling
the SD pin high). Additionally, the LM4906 features an inter-
nal thermal shutdown protection mechanism.
Key Specifications
j Improved PSRR at 217Hz for +3V
71dB
j Power Output at +5V, THD+N = 1%, 81.0W (typ)
j Power Output at +3V, THD+N = 1%, 8390mW (typ)
j Total shutdown power supply current
0.1µA (typ)
Features
n Selectable gain of 6dB (2V/V) or 12dB (4V/V)
n No output or PSRR bypass capacitors required
n Improved “Click and Pop” suppression circuitry
n Very fast turn on time: 5ms (typ)
n Minimum external components
n 2.6 - 5.5V operation
n BTL output can drive capacitive loads
n Ultra low current shutdown mode (SD Low)
Applications
n Portable computers
n Desktop computers
n Multimedia monitors
Typical Application
200571B9
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200571
www.national.com




LM4906MM pdf, 반도체, 판매, 대치품
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 LM4906, see power derating
curves for additional information.
Note 4: Human body model, 100pF discharged through a 1.5kresistor.
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: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: ROUT is measured from the output pin to ground. This value represents the parallel combination of the 10koutput resistors and the two 20kresistors.
Note 10: 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 11: 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.
External Components Description
Components
1. C2
2. C1
Functional Description
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with Ri at fc = 1 / (2πRiCi). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the value of Ci.
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.
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LM4906MM 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
Shutdown Hysteresis Voltage
VDD = 3V, SD Mode = VDD (High)
Shutdown Hysteresis Voltage
VDD = 3V, SD Mode = GND (Low)
200571E5
Output Power
vs Supply Voltage, RL = 8
200571D6
Output Power
vs Supply Voltage, RL = 16
200571D7
Output Power
vs Supply Voltage, RL = 32
Frequency Response
vs Input Capacitor Size
200571D9
200571D8
7
200571F3
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부품번호상세설명 및 기능제조사
LM4906MM

1W/ Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain

National Semiconductor
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