M
50mW, DirectDrive, Stereo Headphone
Amplifier with SmartSense and Shutdown
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
PGND to SGND.....................................................-0.3V to +0.3V
PV
SS
to SV
SS
.........................................................-0.3V to +0.3V
V
DD
to PGND or SGND ............................................-0.3V to +4V
PV
SS
and SV
SS
to PGND or SGND ..........................-4V to +0.3V
IN_, OUT_, and HPS to SGND.......(SV
SS
- 0.3V) to (V
DD
+ 0.3V)
C1P to PGND...............................(PGND - 0.3V) to (V
DD
+ 0.3V)
C1N to PGND.............................(PV
SS
- 0.3V) to (PGND + 0.3V)
ALERT
to PGND .......................................................-0.3V to +4V
MODE_ to PGND........................................-0.3V to (V
DD
+ 0.3V)
TIME to SGND............................................-0.3V to (V
DD
+ 0.3V)
ELECTRICAL CHARACTERISTICS
(V
DD
= V
MODE1
= V
MODE2
= 3.0V, PGND = SGND = 0V, R
L
=
∞
, C1 = C2 = 2.2μF. T
A
= T
MIN
to T
MAX,
unless otherwise noted.
Typical values are at T
A
= +25
°
C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Output Short Circuit to GND or V
DD ...............................
Continuous
Continuous Power Dissipation (T
A
= +70
°
C)
16-Bump UCSP (derate 8.2mW/
°
C above +70
°
C) .......659mW
16-Pin TSSOP (derate 9.4mW/
°
C above +70
°
C) .......754.7mW
Junction Temperature......................................................+150
°
C
Operating Temperature Range ...........................-40
°
C to +85
°
C
Storage Temperature Range.............................-65
°
C to +150
°
C
Bump Temperature (soldering)
Reflow ...........................................................................+235
°
C
Lead Temperature (soldering, 10s).................................+300
°
C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL
Supply Voltage Range
V
DD
Inferred from PSRR test
Stereo mode
M ono m od e ( M OD E 1 = V
D D
, M OD E 2 = GN D
MODE1 = MODE2 = GND
1.8
3.6
8.4
V
5
3
6
Supply Current
I
DD
mA
Shutdown Supply Current
Turn-On/Turn-Off Time
CHARGE PUMP
Oscillator Frequency
HEADPHONE AMPLIFIERS
I
SHDN
t
S
10
μA
μs
250
f
OSC
272
320
368
kHz
MAX9720A
MAX9720B
Between OUTL and OUTR
MAX9720A
MAX9720B
-1.02
-1.443
-1
-0.98
-1.386
Voltage Gain
A
V
-1.415
±
1
-0.8
-1
15
V/V
Gain Match
A
V
%
-5
-6.5
10
+3.6
+4.5
20
Total Output Offset Voltage
(Note 3)
V
OS
mV
Input Resistance
R
IN
k
1.8V
≤
V
DD
≤
3.6V
(Note 3)
DC
76
92
f
RIPPLE
= 217Hz
f
RIPPLE
= 1kHz
f
RIPPLE
= 20kHz
R
L
= 32
R
L
= 16
92
86
61
50
50
Power-Supply Rejection Ratio
PSRR
V
DD
= 3.0V,
200mV
P-P
ripple
(Note 3)
dB
Output Power
P
OUT
THD+N = 1%, f
IN
=
1kHz, T
A
= +25
°
C
32
mW