MOSA
MS6544/6541
Class AB Stereo Headphone Driver with Mute
Stereo Headphone Driver, 0dB / 6dB Gain
Low Voltage, Internal Mute Function
No Popping Noise When Power On / Off
FEATURES
‧Low
supply voltage 2.7 to 5.5V
‧Internal
mute function
‧No
popping noise
‧Fixed
gain of 6 dB for MS6544
Fixed gain of 0 dB for MS6541
‧High
SNR , Slew rate
‧Low
distortion
‧Excellent
power supply ripple rejection
‧Low
power consumption
‧Large
output voltage swing
APPLICATIONS
‧MP3,
PDA
‧Portable
Digital Audio.
‧CD-ROM,
DVD-ROM, CD-RW, DVD-RW
‧Cross-reference
:
6dB: BH3544F, NJM2169
0dB: BH3541F, NJM2168
DESCRIPTION
The MS6544 is an integrated class AB stereo headphone
driver contained in an SO8 package. The MS6544 has
fixed gain of 6dB and the MS6541 has fixed gain of
0dB. The mute function to prevent popping sounds when
the power is turned on and off. It has good performance
at low voltage operation, the MS6544/41 ideally suited
for use in portable digital audio equipment.
BLOCK DIAGRAM
OutA
1
MUTE
2
INA
3
V
SS
4
6dB
(0dB)
MUTE
6dB
(0dB)
8
V
DD
7
OutB
BIAS
90k
(180k)
6
BIAS
5
INB
90k
(180k)
PIN CONFIGURATION
Symbol
OutA
Mute
INA
V
SS
INB
BIAS
OutB
V
DD
REV 1
Pin
1
2
3
4
5
6
7
8
Description
Output A
Mute control
(Low: mute on, High: mute off)
Input A
Negative supply
Input B
Bias (connect CAP)
Output B
Positive supply
1
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OUTA
1
MUTE
2
INA
3
V
SS
4
8
V
DD
MS6544
MS6541
7
OUTB
6
BIAS
5
INB
MOSA
ORDERING INFORMATION
Package
8-Pin SOP
8-Pin SOP
8-Pin SOP (lead free)
8-Pin SOP (lead free)
8-Pin SOP
8-Pin SOP
8-Pin SOP (lead free)
8-Pin SOP (lead free)
Part number
MS6544TR
MS6544U
MS6544GTR
MS6544GU
MS6541TR
MS6541U
MS6541GTR
MS6541GU
MS6544
MS6544
MS6544G
MS6544G
MS6541
MS6541
MS6541G
MS6541G
MS6544/6541
Class AB Stereo Headphone Driver with Mute
Packaging Marking
Transport Media
2.5k Units Tape and Reel
100 Units Tube
2.5k Units Tape and Reel
100 Units Tube
2.5k Units Tape and Reel
100 Units Tube
2.5k Units Tape and Reel
100 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
ESD
T
STG
T
A
T
J
T
S
R
THJA
Supply Voltage
Electrostatic Handling
Storage Temperature Range
Operating Ambient Temperature Range
Maximum Junction Temperature
Soldering Temperature, 10 seconds
Thermal Resistance from Junction to Ambient in Free Air
SOP8
Parameter
Rating
6
-4500 to 4500
-65 to 150
-40 to 85
150
260
210
Unit
V
V
℃
℃
℃
℃
℃/W
OPERATING RATINGS
Symbol
V
DD
Supply Voltage
Parameter
Min
2.7
Typ
-
Max
5.5
Unit
V
REV 1
2
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MOSA
5V ELECTRICAL CHARACTERISTICS
MS6544/6541
Class AB Stereo Headphone Driver with Mute
(Ta=25℃, V
DD
=5V, V
SS
=0V, Vo=2Vpp, f=1kHz, A
V
=1, R
L
=32
Ω
; unless otherwise specified)
Conditions
Min
Typ
Symbol
Parameter
DC Characteristics
I
Q
V
TM
G
VC
PSRR
CS
ATT
S/N
THD+N
SR
Max
1.6
4.1
1
V
DD
7
1
-
-
-
-
-62
-
-
-
Unit
mA
mA
V
V
dB
dB
dB
dB
dB
dB
dB
V/
µ
s
mW
Vpp
Quiescent current
Mute control voltage
Voltage Gain
Power supply rejection ratio
Channel separation
Mute attenuation
Signal-to-noise
Total harmonic distortion
plus noise
Slew rate
Maximum output power
Maximum output voltage swing
Vo=0Vpp
2 channels
Mute On
Mute Off
-
3.7
0
3
5
-1
57
100
100
95
-
-
130
4.1
1.5
3.9
-
-
6
0
60
117
115
99
-64
5
140
4.2
Mute on
Mute off
MS6544 : 6dB
MS6541 : 0dB
Vripple = -20dBV, 100Hz
Vo=0dBV
Vo=0dBV
Vo=4Vpp
Vo=2Vpp
Unity gain inverting
(THD+N)/S<0.1
%
, 2 ch
(THD+N)/S<0.1
%
AC Characteristics
Po
V
O
3.3V ELECTRICAL CHARACTERISTICS
(Ta=25℃, V
DD
=3.3V, V
SS
=0V, Vo=2Vpp, f=1kHz, A
V
=1, R
L
=32
Ω
; unless otherwise specified)
Conditions
Min
Typ
Symbol
Parameter
DC Characteristics
I
Q
V
TM
PSRR
CS
ATT
S/N
THD+N
Po
V
O
Quiescent current
Mute control voltage
Power supply rejection ratio
Channel separation
Mute attenuation
Signal-to-noise
Total harmonic distortion
plus noise
Maximum output power
Maximum output voltage swing
Vo=0Vpp
2 channels
Mute on
Mute off
Vripple = -20dBV, 100Hz
Vo=0dBV
Vo=0dBV
Vo=2.6Vpp
Vo=2Vpp
(THD+N/S)<0.1
%
, 2 ch
(THD+N)/S<0.1
%
Mute On
Mute Off
-
-
0
2.5
57
100
100
93
-
49
2.5
1.3
3.3
-
-
60
115
115
97
-64
52
2.6
1.4
3.5
1
V
DD
-
-
-
-
-62
-
-
mA
mA
V
V
dB
dB
dB
dB
dB
mW
Vpp
Max
Unit
AC Characteristics
REV 1
3
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MOSA
2.7V ELECTRICAL CHARACTERISTICS
MS6544/6541
Class AB Stereo Headphone Driver with Mute
(Ta=25℃, V
DD
=2.7V, V
SS
=0V, Vo=2Vpp, f=1kHz, A
V
=1, R
L
=32
Ω
; unless otherwise specified)
Conditions
Min
Typ
Symbol
Parameter
DC Characteristics
I
Q
V
TM
PSRR
CS
ATT
S/N
THD+N
Max
1.3
3.2
1
V
DD
-
-
-
-
-62
-
-
Unit
mA
mA
V
V
dB
dB
dB
dB
dB
mW
Vpp
Quiescent current
Mute control voltage
Power supply rejection ratio
Channel separation
Mute attenuation
Signal-to-noise
Total harmonic distortion
plus noise
Maximum output power
Maximum output voltage swing
Vo=0Vpp
2 channels
Mute on
Mute off
Mute On
Mute Off
-
-
0
2.5
57
100
100
92
-
28
1.9
1.2
3.0
-
-
60
112
115
96
-64
31
2
Vripple = -20dBV, 100Hz
Vo=-3dBV
Vo=-3dBV
Vo=2Vpp
Vo=2Vpp
(THD+N/S)<0.1%, 2 ch
(THD+N)/S<0.1%
AC Characteristics
Po
V
O
REV 1
4
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MOSA
TYPICAL PERFORMANCE CHARACTERISTICS
(Ta=25℃, R
L
=32
Ω
; unless otherwise specified)
MS6544/6541
Class AB Stereo Headphone Driver with Mute
THD+N (%)
THD+N (%)
f=1kHz
f=1kHz
THD+N (%)
f=20kHz
f=20kHz
f=20kHz
f=1kHz
f=20Hz
V
DD
=5V
V
DD
=3.3V
f=20Hz
f=20Hz
V
DD
=2.7V
OUTPUT VOLTAGE (dBV)
OUTPUT VOLTAGE (dBV)
OUTPUT VOLTAGE (dBV)
THD+N vs. output voltage
THD+N vs. output voltage
THD+N vs. output voltage
CHANNEL SEPARATION (dB)
V
DD
=3.3V
V
IN
=0dBV
MUTE ATTENUATION (dB)
V
DD
=5V
V
IN
=0dBV
V
DD
=2.7V
V
IN
=-3dBV
V
DD
=3.3V
V
IN
=-0dBV
V
DD
=5V
V
DD
=2.7V
V
IN
=-3dBV
PSRR (dB)
V
DD
=5V
V
IN
=0dBV
V
DD
=2.7V
V
DD
=3V
V
RR
=-20dBV
Bias C=47uF
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
Channel separation vs. frequency
Mute Attenuation vs. frequency
PSRR vs. frequency
QUIESCENT CURRENT (mA)
Mute Off
Mute On
SUPPLY VOLTAGE (V)
Quiescent current vs. supply voltage
REV 1
5
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