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LM4991 데이터시트 PDF




National Semiconductor에서 제조한 전자 부품 LM4991은 전자 산업 및 응용 분야에서
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부품번호 LM4991 기능
기능 3W Audio Power Amplifier with Shutdown Mode
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LM4991 데이터시트, 핀배열, 회로
May 2003
LM4991
3W Audio Power Amplifier with Shutdown Mode
General Description
The LM4991 is a mono bridged audio power amplifier ca-
pable of delivering 3W of continuous average power into a
3load with less than 10% THD when powered by a 5V
power supply (Note 1). To conserve power in portable appli-
cations, the LM4991’s micropower shutdown mode (ISD =
0.1µA, typ) is activated when VDD is applied to the SHUT-
DOWN pin.
Boomer audio power amplifiers are designed specifically to
provide high power, high fidelity audio output. They require
few external components and operate on low supply volt-
ages from 2.2V to 5.5V. Since the LM4991 does not require
output coupling capacitors, bootstrap capacitors, or snubber
networks, it is ideally suited for low-power portable systems
that require minimum volume and weight.
Additional LM4991 features include thermal shutdown pro-
tection, unity-gain stability, and external gain set.
Note 1: An LM4991LD that has been properly mounted to a circuit board will
deliver 3W into 3(at 10% THD). The other package options for the LM4991
will deliver 1.5W into 8(at 10% THD). See the Application Information
sections for further information concerning the LM4991LD and LM4991M.
Key Specifications
n Improved PSRR at 217kHz and 1kHz
64dB (typ)
n PO at VDD = 5.0V, 10% THD, 1kHz
n LM4991LD (only), 3, 4
3W (typ), 2.5W (typ)
n All packages, 8load
1.5W (typ)
n Shutdown current
0.1µA (typ)
Features
n Available in space-saving LLP and MA packages
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry reduces noises during
turn-on and turn-off transitions
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks,
bootstrap capacitors or gain-setting resistors required
n Unity-gain stable
Applications
n Wireless and cellular handsets
n PDA’s
n Portable computers
n Desktop computers
Connection Diagrams
Small Outline Package
LLP Package
20074002
Top View
Order Number LM4991MA
See NS Package Number M08A
20074039
Top View
Order Number LM4991LD
See NS Package Number LDC08A
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200740
www.national.com




LM4991 pdf, 반도체, 판매, 대치품
Electrical Characteristics VDD = 3V (Notes 2, 3)
The following specifications apply for VDD = 3V and RL = 8unless otherwise specified. Limits apply for TA =
25˚C. (Continued)
Symbol
Parameter
PSRR
Power Supply Rejection
Ratio
Conditions
VRIPPLE = 200mV sine p-p,
Input terminated with 10,
f = 1kHz
LM4991
Typical
Limit
(Note 7)
(Note 8)
68
Units
(Limits)
dB
Electrical Characteristics VDD = 2.6V (Notes 2, 3)
The following specifications apply for VDD = 2.6V and RL = 8unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
IDD
ISD
VSDIH
VSDIL
VOS
Po
THD+N
PSRR
Quiescent Power Supply
Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Output Offset Voltage
Output Power
Total Harmonic
Distortion+Noise
Power Supply Rejection
Ratio
VIN = 0V, no Load
VIN = 0V, RL = 8
VSHUTDOWN = VDD
THD = 1% (max), f = 1kHz
RL = 4
RL = 8
PO = 0.15W, f = 1kHz
VRIPPLE = 200mV sine p-p,
Input terminated with 10,
f = 1kHz
LM4991
Typical
Limit
(Note 7)
(Note 8)
2
3
0.1
1
0.9
5 35
400
300
0.1
Units
(Limits)
mA (max)
µA(max)
V
V
mV (max)
mW
%
51 dB
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: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 4: 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 LM4991, TJMAX = 150˚C.
For the θJA’s for different packages, please see the Application Information section or the Absolute Maximum Ratings section.
Note 5: Human body model, 100pF discharged through a 1.5kresistor.
Note 6: Machine Model, 220pF–240pF discharged through all pins.
Note 7: Typicals are specified at 25˚C and represent the parametric norm.
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9: The given θJA is for an LM4991 packaged in an LDC08A with the Exposed–DAP soldered to an exposed 1in2 area of 1oz printed circuit board copper.
Note 10: When driving 3or 4loads from a 5V supply, the LM4991LD must be mounted to a circuit board.
www.national.com
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LM4991 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
THD+N vs Output Power
VDD = 2.6V, RL = 4, and f = 1kHz
THD+N vs Output Power
VDD = 2.6V, RL = 8, and f = 1kHz
20074051
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 5V, RL = 8, input 10terminated
20074052
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 5V, RL = 8, input floating
20074053
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 3V, RL = 8, input 10terminated
20074054
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 3V, RL = 8, input floating
20074055
7
20074056
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