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LM4893MA 데이터시트 PDF




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부품번호 LM4893MA 기능
기능 1.1 Watt Audio Power Amplifier
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LM4893MA 데이터시트, 핀배열, 회로
August 2004
LM4893
1.1 Watt Audio Power Amplifier
General Description
The LM4893 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 1.1 watt of continuous average power to an 8
BTL 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 LM4893 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for lower-power portable applications where
minimal space and power consumption are primary require-
ments.
The LM4893 features a low-power consumption global shut-
down mode, which is achieved by driving the shutdown pin
with logic low. Additionally, the LM4893 features an internal
thermal shutdown protection mechanism.
The LM4893 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4893 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Improved PSRR at 5V, 3V, & 217Hz
j Higher Power Output at 5V & 1% THD
j Higher Power Output at 3V & 1% THD
j Shutdown Current
62dB (typ)
1.1W (typ)
350mW (typ)
0.1µA (typ)
Features
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
n Unity gain stable
n Ultra low current shutdown mode
n Instantaneous turn-on time
n BTL output can drive capacitive loads up to 100pF
n Advanced pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 2.2V - 5.5V operation
n Available in space-saving µSMD, SO, and MSOP
packages
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
Typical Application
20038001
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200380
www.national.com




LM4893MA pdf, 반도체, 판매, 대치품
Electrical Characteristics VDD = 3.0V (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
NOUT
Output Noise
Conditions
A-Weighted; Measured across 8
BTL
Input terminated with 10to
ground
LM4893
Typical
Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
26 µVRMS
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
VOS
Po
THD+N
PSRR
Quiescent Power Supply Current
Shutdown Current
Output Offset Voltage
Output Power
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
VIN = 0V, 8BTL
Vshutdown = GND
THD = 1% (max); f = 1kHz
RL = 8
RL = 4
Po = 0.1Wrms; f = 1kHz
Vripple = 200mVsine p-p, CB =
1.0µF
Input terminated with 10to
ground
LM4893
Typical
Limit
(Note 6) (Notes 7, 8)
3.5
0.1
5
Units
(Limits)
mA
µA
mV
250
350
0.1
55 (f = 1kHz)
55 (f =
217Hz)
mW
%
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 LM4893, see power derating
curves for additional information.
Note 4: Human body model, 100 pF discharged through a 1.5 kresistor.
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: 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 part will be protected. If the part is enabled when VDD is above 6V, circuit performance will
be curtailed or the part may be permanently damaged.
Note 10: All bumps have the same thermal resistance and contribute equally when used to lower thermal resistance.
Note 11: Maximum power dissipation (PDMAX) in the device occurs at an output power level significantly below full output power. PDMAX can be calculated using
Equation 1 shown in the Application section. It may also be obtained from the power dissipation graphs.
www.national.com
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LM4893MA 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
Power Supply Rejection Ratio (PSRR) @ VDD = 5V
Power Supply Rejection Ratio (PSRR) @ VDD = 3V
Input terminated with 10R
20038045
Power Supply Rejection Ratio (PSRR) @ VDD = 2.6V
Input terminated with 10R
20038073
Power Dissipation vs Output Power @ VDD = 5V
Input terminated with 10R
20038047
20038046
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