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부품번호 | LM4990LD 기능 |
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기능 | 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 19 페이지수
January 2004
LM4990
2 Watt Audio Power Amplifier with Selectable Shutdown
Logic Level
General Description
The LM4990 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 1.25 watts of continuous average power to an 8Ω
BTL load and 2 watts of continuous average power (LD and
MH only) to a 4Ω BTL load with less than 1% distortion
(THD+N+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 LM4990 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4990 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
pin to be driven in a likewise manner to enable shutdown.
The LM4990 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4990 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Improved PSRR at 217Hz & 1KHz
j Power Output at 5.0V, 1%
THD+N,
4Ω (LD and MH only)
j Power Output at 5.0V, 1% THD+N, 8Ω
j Power Output at 3.0V, 1% THD+N, 4Ω
j Power Output at 3.0V, 1% THD+N, 8Ω
j Shutdown Current
62dB
2W (typ)
1.25W (typ)
600mW (typ)
425mW (typ)
0.1µA (typ)
Features
n Available in space-saving packages: LLP, Exposed-DAP
TSSOP, MSOP, and ITL
n Ultra low current shutdown mode
n Improved pop & click circuitry eliminates noise during
turn-on and turn-off transitions
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
n Unity-gain stable
n External gain configuration capability
n User selectable shutdown High or Low logic Level
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
Connection Diagrams
Mini Small Outline (MSOP) Package
MSOP Marking
200510B9
Top View
Order Number LM4990MM
See NS Package Number MUA08A
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200510
20051071
Top View
Z - Plant Code
X - Date Code
TT - Die Traceability
G - Boomer Family
A5 - LM4990MM
www.national.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (Note 11)
Storage Temperature
Input Voltage
Power Dissipation (Notes 3, 12)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
Thermal Resistance
θJC (MSOP)
6.0V
−65˚C to +150˚C
−0.3V to VDD +0.3V
Internally Limited
2000V
200V
150˚C
56˚C/W
θJA (MSOP)
θJA (9 Bump micro SMD) (Note 15)
θJA (LLP)
θJC (LLP)
Soldering Information
See AN-1187 "Leadless
Leadframe Package (LLP)."
190˚C/W
180˚C/W
63˚C/W (Note 13)
12˚C/W (Note 13)
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage
−40˚C ≤ TA ≤ 85˚C
2.2V ≤ VDD ≤ 5.5V
Electrical Characteristics VDD = 5V (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
VSDIH
VSDIL
VSDIH
VSDIL
VOS
ROUT
Quiescent Power Supply Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Shutdown Voltage Input High
Shutdown Voltage Input Low
Output Offset Voltage
VIN = 0V, Io = 0A, No Load
VIN = 0V, Io = 0A, 8Ω Load
VSD = VSD Mode (Note 8)
VSD MODE = VDD
VSD MODE = VDD
VSD MODE = GND
VSD MODE = GND
Resistor Output to GND (Note 10)
Output Power (8Ω)
Po (4Ω) (Notes 13, 14)
TWU
Wake-up time
THD+N+N Total Harmonic Distortion+Noise
PSRR Power Supply Rejection Ratio
THD+N = 1% (max); f = 1kHz
THD+N = 1% (max); f = 1kHz
Po = 0.5Wrms; f = 1kHz
Vripple = 200mV sine p-p
Input terminated with 10Ω
LM4990
Typical
Limit
(Note 6) (Notes 7, 9)
37
4 10
0.1 2.0
1.5
1.3
1.5
1.3
7 50
9.7
8.5
7.0
1.25
0.9
2
100
0.2
60 (f =
217Hz)
64 (f = 1kHz)
55
Units
(Limits)
mA (max)
mA (max)
µA (max)
V
V
V
V
mV (max)
kΩ (max)
kΩ (min)
W (min)
W
ms
%
dB (min)
Electrical Characteristics VDD = 3V (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
VSDIH
VSDIL
VSDIH
VSDIL
VOS
ROUT
Quiescent Power Supply Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Shutdown Voltage Input High
Shutdown Voltage Input Low
Output Offset Voltage
VIN = 0V, Io = 0A, No Load
VIN = 0V, Io = 0A, 8Ω Load
VSD = VSD Mode (Note 8)
VSD MODE = VDD
VSD MODE = VDD
VSD MODE = GND
VSD MODE = GND
Resistor Output to GND (Note 10)
LM4990
Typical
Limit
(Note 6) (Notes 7, 9)
27
39
0.1 2.0
1.1
0.9
1.3
1.0
7 50
9.7
8.5
7.0
Units
(Limits)
mA (max)
mA (max)
µA (max)
V
V
V
V
mV (max)
kΩ (max)
kΩ (min)
www.national.com
4
4페이지 Typical Performance Characteristics
THD+N+N vs Frequency
VDD = 5V, RL = 8Ω, and PO = 500mW
THD+N+N vs Frequency
VDD = 3V, RL = 4Ω, and PO = 500mW
20051032
THD+N+N vs Frequency
VDD = 3V, RL = 8Ω, and PO = 250mW
20051033
THD+N+N vs Frequency
VDD = 2.6V, RL = 4Ω, and PO = 150mW
20051034
THD+N+N vs Output Power
VDD = 2.6V, RL = 8Ω, and PO = 150mW
20051083
THD+N+N vs Output Power
VDD = 5V, RL = 8Ω, and f = 1kHz
20051084
7
20051085
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LM4990LD | 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level | National Semiconductor |
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