Datasheet
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(All voltages referenced to GND.)
V
DD
to PGND, AGND .............................................................30V
OUTR_, OUTL_, C1N..................................-0.3V to (V
DD
+ 0.3V)
C1P............................................(V
DD
- 0.3V) to (CHOLD + 0.3V)
CHOLD........................................................(V
DD
- 0.3V) to +40V
SHDN, FS_, G_ ...........................................................-6.3V to 8V
All Other Pins to GND.............................................-0.3V to +12V
Duration of OUTR_/OUTL_
Short Circuit to GND, V
DD
......................................Continuous
Continuous Input Current (V
DD
, PGND) ..................................2A
Continuous Input Current (all other pins)..........................±20mA
Thermal Limits (Note 1)
Continuous Power Dissipation (T
A
= +70°C)
Single-Layer PC Board
56-Pin TQFN (derate 28.6mW/°C above +70°C) ............2.29W
θ
JA
................................................................................ 35°C/W
θ
JC
............................................................................... 0.6°C/W
Continuous Power Dissipation (T
A
= +70°C)
Multiple-Layer PC Board
56-Pin TQFN (derate 47.6mW/°C above +70°C) ............3.81W
θ
JA
................................................................................ 21°C/W
θ
JC
............................................................................... 0.6°C/W
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
DD
= 18V, GND = PGND = 0V, SHDN ≥ V
IH
, A
V
= 16dB, C
SS
= C
IN
= 0.47µF, C
REG
= 0.01µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 =
GND (f
S
= 670kHz), R
L
connected between OUTL+ and OUTL- and OUTR+ and OUTR-, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
GENERAL
Supply Voltage Range V
DD
Inferred from PSRR test 10 25 V
Quiescent Current I
DD
R
L
= Open 26 37
mA
Shutdown Current
I
SHDN
0.2 1.5 µA
C
SS
= 470nF 100
Turn-On Time t
ON
C
SS
= 180nF 50
ms
Amplifier Output Resistance in
Shutdown
SHDN = GND 150 320 kΩ
A
V
= 13dB 35 53 80
A
V
= 16dB 30 45 65
A
V
= 19.1dB 23 36 55
Input Impedance R
IN
A
V
= 29.6dB 10
14.3
22
kΩ
G1 = L, G2 = L
29.4 29.6 29.8
G1 = L, G2 = H
18.9 19.1 19.3
G1 = H, G2 = L
12.8
13
13.2
Voltage Gain A
V
G1 = H, G2 = H
15.9
16
16.3
dB
Gain Matching Between channels 0.5 %
Output Offset Voltage V
OS
±5 ±30
mV
Common-Mode Rejection Ratio
CMRR
f
IN
= 1kHz, input referred 60 dB
V
DD
= 10V to 25V 48 83
f
RIPPLE
= 1kHz 80
Power-Supply Rejection Ratio
(Note 3)
PSRR
200mV
P-P
ripple
f
RIPPLE
= 20kHz 60
dB
Note 1: Thermal performance of this device is highly dependant on PC board layout. See the Applications Information for more
detail.