National Semiconductor LM4919 Technical data
May 2004
LM4919
1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone
Audio Amplifier
LM4919 1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone Audio Amplifier
General Description
The unity gain stable LM4919 is both a mono-BTL audio
power amplifier and a Single Ended (SE) stereo headphone
amplifier. Operating on a single 1.5V supply, the mono BTL
mode delivers 85mW into an 8Ω load at 1% THD+N. In
Single Ended stereo headphone mode, the amplifier delivers
14mW per channel into a 16Ω load at 1% THD+N.
With the LM4919 packaged in the MM package, the customer benefits include low profile and small size. This package minimizes PCB area and maximizes output power.
The LM4919 features circuitry that reduces output transients
("clicks" and "pops") during device turn-on and turn-off, an
externally controlled, low-power consumption, active-low
shutdown mode, and thermal shutdown. Boomer audio
power amplifiers are designed specifically to use few external components and provide high quality output power in a
surface mount package.
Typical Application
Key Specifications
n Mono-BTL output power
n (R
n Stereo Headphone output power
n (R
n Micropower shutdown current 0.02µA (typ)
n Supply voltage operating range 0.9V
n PSRR 1kHz, V
=8Ω,VDD= 1.5V, THD+N = 1%) 85mW (typ)
L
=16Ω,VDD= 1.5V, THD+N = 1%) 14mW (typ)
L
<
<
V
= 1.5V, RL=16Ω 72dB (typ)
DD
DD
2.5V
Features
n Single-cell 0.9V to 2.5V battery operation
n BTL mode for mono speaker
n Single ended headphone operation with coupling
capacitors
n Unity-gain stable
n "Click and pop" suppression circuitry
n Active low micropower shutdown
n Low current, active-low mute mode
n Thermal shutdown protection circuitry
Applications
n Portable one-cell audio products
n Portable one-cell electronic devices
20082101
FIGURE 1. Block Diagram
Boomer®is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200821 www.national.com
Connection Diagrams
LM4919
MSOP Package
Top View
20082102
Order Number LM4919MM
See NS Package Number MUB10A for MSOP
MSOP Marking
Z - Plant Code
200821F9
X - Date Code
T - Die Traceability
G - Boomer Family
B6 - LM4919MM
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Typical Connections
LM4919
FIGURE 2. Typical Single Ended Output Configuration Circuit
20082103
FIGURE 3. Typical BTL Speaker Configuration Circuit
20082105
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
LM4919
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 3.6V
Junction Temperature 150˚C
Thermal Resistance
θ
(typ) MUB10A 175˚C/W
JA
Operating Ratings
Storage Temperature −65˚C to +150˚C
Input Voltage −0.3V to V
DD
+0.3V
Power Dissipation (Note 2) Internally limited
ESD Susceptibility(Note 3) 2000V
Temperature Range
T
MIN
≤ TA≤ T
MAX
−40˚C ≤ TA≤ 85˚C
Supply Voltage 0.9V ≤ V
ESD Susceptibility (Note 4) 200V
Electrical Characteristics for the LM4919 (Notes 1, 5)
The following specifications apply for the circuit shown in Figure 4 operating with VDD= 1. 5V, unless otherwise
DMAX
= 25˚C.
A
=(T
JMAX−TA
Typical Limit
(Note 6) (Note 7)
2.5 V (max)
SHUTDOWN
= GND 0.02 µA
f = 1kHz
RL=8Ω BTL, THD+N = 1% 85 70 mW (min)
R
=16Ω SE, THD+N = 1% 14 mW (min)
L
R
=8Ω, BTL, PO= 25mW, f = 1kHz 0.2
L
R
=16Ω, SE, PO= 5mW, f = 1kHz 0.07
L
0.5 % (max)
20Hz to 20kHz, A-weighted SE 10 µV
20Hz to 20kHz, A-weighted BTL 15 µV
=0,SE 15 µA
MUTE
=16Ω,SE 55 dB
L
V
C
RIPPLE
BYPASS
= 200mV
P-P
= 4.7µF, RL=8Ω
70 dB
f = 1kHz, BTL
V
C
= 200mV
RIPPLE
= 4.7µF, RL=16Ω
BYPASS
sine wave
P-P
72 dB
f = 1kHz, SE
, θJA, and the ambient temperature TAand must be derated at elevated temperatures. The maximum
JMAX
)/θJA. For the LM4919, T
= 150˚C. For the θJAs, please see the Application Information section or the
JMAX
specified. Limits apply for T
Symbol Parameter Conditions LM4919 Units
V
DD
I
DD
I
SD
V
OS
P
O
Supply Voltage (Notes 10, 11) 0.9 V (min)
Quiescent Power Supply Current VIN= 0V, IO= 0A, RL=∞(Note 8) 0.9 1.4 mA (max)
Shutdown Current V
Output Offset Voltage BTL 5 50 mV (max)
Output Power (Note 9)
THD+N Total Harmonic Distortion + Noise
V
I
MUTE
NO
Output Voltage Noise
Mute Current V
Crosstalk R
PSRR Power Supply Rejection Ratio
V
IH
V
IL
Control Logic High 0.9 V
Control Logic Low 0.3 V
Note 1: 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 andAC 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 2: The maximum power dissipation is dictated by T
allowable power dissipation is P
Absolute Maximum Ratings section.
Note 3: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 4: Machine model, 220pF–240pF discharged through all pins.
Note 5: All voltages are measured with respect to the ground (GND) pins unless otherwise specified.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 8: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.
Note 9: Output power is measured at the device terminals.
≤ 2.5V
DD
(Limits)
RMS
RMS
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Typical Performance Characteristics
LM4919
THD+N vs Frequency
= 1.5V, PO= 5mW, RL=16Ω
V
DD
= –1, Single Ended Output
A
V
THD+N vs Frequency
= 1.2V, PO= 5mW
V
DD
=16Ω,AV= -1, Single Ended Output
R
L
THD+N vs Frequency
V
= 1.5V, RL=8Ω,PO= 25mW
DD
20082112 20082113
= -1, BTL Output
A
V
THD+N vs Frequency
V
= 1.2V, RL=8Ω,PO= 25mW
DD
= -1, BTL Output
A
V
THD+N vs Output Power
= 1.5V, RL=16Ω, f = 1kHz
V
DD
= -1, Single Ended Output
A
V
20082111 20082114
THD+N vs Output Power
V
= 1.5V, RL=8Ω, f = 1kHz
DD
= -1, BTL Output
A
V
20082117
20082115
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