MO
SA
MS6544/6541
Class AB Stereo Headphone Driver with Mute
REV 1
1
www.mosanalog.com.tw
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
7
6
5
8
2
3
4
1
INB
V
DD
OutB
BIAS
OutA
MUTE
INA
V
SS
MUTE
BIAS
90k
(180k)
90k
(180k)
6dB
(0dB)
6dB
(0dB)
PIN CONFIGURATION
Symbol Pin
Description
OutA 1 Output
A
Mute 2
Mute control
(Low: mute on, High: mute off)
INA 3
Input
A
V
SS
4 Negative
supply
INB 5
Input
B
BIAS
6
Bias (connect CAP)
OutB 7 Output
B
V
DD
8 Positive
supply
7
6
5
8
2
3
4
1
MS6544
MS6541
V
DD
OUTB
BIAS
INB
OUTA
MUTE
INA
V
SS
MO
SA
MS6544/6541
Class AB Stereo Headphone Driver with Mute
REV 1
2
www.mosanalog.com.tw
ORDERING INFORMATION
Package
Part number
Packaging Marking
Transport Media
8-Pin SOP
MS6544TR
MS6544
2.5k Units Tape and Reel
8-Pin SOP
MS6544U
MS6544
100 Units Tube
8-Pin SOP (lead free)
MS6544GTR
MS6544G
2.5k Units Tape and Reel
8-Pin SOP (lead free)
MS6544GU
MS6544G
100 Units Tube
8-Pin SOP
MS6541TR
MS6541
2.5k Units Tape and Reel
8-Pin SOP
MS6541U
MS6541
100 Units Tube
8-Pin SOP (lead free)
MS6541GTR
MS6541G
2.5k Units Tape and Reel
8-Pin SOP (lead free)
MS6541GU
MS6541G
100 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter Rating
Unit
V
DD
Supply
Voltage
6
V
V
ESD
Electrostatic Handling
-4500 to 4500
V
T
STG
Storage Temperature Range
-65 to 150
T
A
Operating Ambient Temperature Range
-40 to 85
T
J
Maximum Junction Temperature
150
T
S
Soldering Temperature, 10 seconds
260
R
THJA
Thermal Resistance from Junction to Ambient in Free Air
SOP8
210
/W
OPERATING RATINGS
Symbol Parameter Min Typ Max Unit
V
DD
Supply Voltage
2.7
-
5.5
V
MO
SA
MS6544/6541
Class AB Stereo Headphone Driver with Mute
REV 1
3
www.mosanalog.com.tw
5V ELECTRICAL CHARACTERISTICS
(Ta=25, V
DD
=5V, V
SS
=0V, Vo=2Vpp, f=1kHz, A
V
=1, R
L
=32
; unless otherwise specified)
Symbol Parameter
Conditions Min
Typ
Max
Unit
DC Characteristics
Mute On
-
1.5
1.6
mA
I
Q
Quiescent current
Vo=0Vpp
2 channels
Mute Off
3.7
3.9
4.1
mA
Mute on
0
-
1
V
V
TM
Mute control voltage
Mute off
3
-
V
DD
V
MS6544 : 6dB
5
6
7
dB
G
VC
Voltage Gain
MS6541 : 0dB
-1
0
1
dB
PSRR
Power supply rejection ratio
Vripple = -20dBV, 100Hz
57
60
-
dB
CS Channel
separation
Vo=0dBV
100 117 - dB
ATT Mute
attenuation
Vo=0dBV
100 115 -
dB
AC Characteristics
S/N Signal-to-noise
Vo=4Vpp
95 99 - dB
THD+N
Total harmonic distortion
plus noise
Vo=2Vpp -
-64
-62
dB
SR
Slew rate
Unity gain inverting
-
5
-
V/
s
Po
Maximum output power
(THD+N)/S<0.1
%
, 2 ch
130
140
-
mW
V
O
Maximum output voltage swing
(THD+N)/S<0.1
%
4.1
4.2
-
Vpp
3.3V ELECTRICAL CHARACTERISTICS
(Ta=25, V
DD
=3.3V, V
SS
=0V, Vo=2Vpp, f=1kHz, A
V
=1, R
L
=32
; unless otherwise specified)
Symbol Parameter
Conditions Min
Typ
Max
Unit
DC Characteristics
Mute On
-
1.3
1.4
mA
I
Q
Quiescent current
Vo=0Vpp
2 channels
Mute Off
-
3.3
3.5
mA
Mute on
0
-
1
V
V
TM
Mute control voltage
Mute off
2.5
-
V
DD
V
PSRR
Power supply rejection ratio
Vripple = -20dBV, 100Hz
57
60
-
dB
CS Channel
separation
Vo=0dBV
100 115 - dB
ATT Mute
attenuation
Vo=0dBV
100 115 -
dB
AC Characteristics
S/N Signal-to-noise
Vo=2.6Vpp
93 97 - dB
THD+N
Total harmonic distortion
plus noise
Vo=2Vpp -
-64
-62
dB
Po
Maximum output power
(THD+N/S)<0.1
%
, 2 ch
49
52
-
mW
V
O
Maximum output voltage swing
(THD+N)/S<0.1
%
2.5
2.6
-
Vpp
MO
SA
MS6544/6541
Class AB Stereo Headphone Driver with Mute
REV 1
4
www.mosanalog.com.tw
2.7V ELECTRICAL CHARACTERISTICS
(Ta=25, V
DD
=2.7V, V
SS
=0V, Vo=2Vpp, f=1kHz, A
V
=1, R
L
=32
; unless otherwise specified)
Symbol Parameter
Conditions Min
Typ
Max
Unit
DC Characteristics
Mute On
-
1.2
1.3
mA
I
Q
Quiescent current
Vo=0Vpp
2 channels
Mute Off
-
3.0
3.2
mA
Mute on
0
-
1
V
V
TM
Mute control voltage
Mute off
2.5
-
V
DD
V
PSRR
Power supply rejection ratio
Vripple = -20dBV, 100Hz
57
60
-
dB
CS Channel
separation
Vo=-3dBV
100 112 - dB
ATT Mute
attenuation
Vo=-3dBV
100 115 -
dB
AC Characteristics
S/N Signal-to-noise
Vo=2Vpp
92 96 - dB
THD+N
Total harmonic distortion
plus noise
Vo=2Vpp -
-64
-62
dB
Po
Maximum output power
(THD+N/S)<0.1%, 2 ch
28
31
-
mW
V
O
Maximum output voltage swing
(THD+N)/S<0.1%
1.9
2
-
Vpp
MO
SA
MS6544/6541
Class AB Stereo Headphone Driver with Mute
REV 1
5
www.mosanalog.com.tw
TYPICAL PERFORMANCE CHARACTERISTICS
(Ta=25, R
L
=32
; unless otherwise specified)
THD+N (%)
OUTPUT VOLTAGE (dBV)
THD+N (%)
OUTPUT VOLTAGE (dBV)
THD+N (%)
OUTPUT VOLTAGE (dBV)
THD+N vs. output voltage
THD+N vs. output voltage
THD+N vs. output voltage
f=20kHz
f=20kHz
f=20kHz
f=1kHz
f=1kHz
f=1kHz
f=20Hz
f=20Hz
f=20Hz
V
DD
=5V
V
DD
=2.7V
V
DD
=3.3V
C
H
A
N
N
E
L SEPAR
ATION
(
d
B)
FREQUENCY (Hz)
MUTE ATTENUATION (dB)
FREQUENCY (Hz)
PSR
R
(
d
B)
FREQUENCY (Hz)
Channel separation vs. frequency
Mute Attenuation vs. frequency
PSRR vs. frequency
V
DD
=5V
V
IN
=0dBV
V
DD
=2.7V
V
IN
=-3dBV
V
DD
=3.3V
V
IN
=0dBV
V
DD
=3.3V
V
IN
=-0dBV
V
DD
=2.7V
V
IN
=-3dBV
V
DD
=5V
V
DD
=5V
V
IN
=0dBV
V
DD
=2.7V
V
DD
=3V
V
RR
=-20dBV
Bias C=47uF
QUIE
S
C
E
N
T CURRE
NT (mA
)
SUPPLY VOLTAGE (V)
Quiescent current vs. supply voltage
Mute Off
Mute On
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