Datasheet

MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—Single-Supply, Single-Ended Output
(V
DD
= 24V, V
SS
= V
SUB
= LGND = 0V, V
SHDN
= 3.3V, V
MID
= 12V, C
VDD
= 660µF, C
MID1
= 10µF, C
MID2
= 10µF, R1 = R2 = R3 =
10kΩ, C
SFT
= 0.47µF, C
OUT
= 1000µF, C
FB_1
= 150pF, C
FB_2
= 10pF, C
BOOT
= 0.1µF, C
REGP
= C
REGM
= 1µF, R
IN_
= 30.1kΩ,
R
F1A
= 121kΩ, R
F1B
= 562kΩ, R
F2
= 681kΩ, R
REF
= 68kΩ, R
L
= ∞, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
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.
V
DD
to V
SS
, NSENSE ..............................................-0.3V to +45V
MID, LGND, LV
DD
, REGM, REGP, OUTR,
OUTL to V
SS
.......................................................-0.3V to +45V
MID, LGND, LV
DD
, REGM, REGP, OUTR,
OUTL to V
DD
.......................................................-45V to +0.3V
REGLS to V
SS
.........................................................-0.3V to +12V
MID to REGP, REGM...............(V
REGM
- 0.3V) to (V
REGP
+ 0.3V)
REGP to REGM.......................................................-0.3V to +12V
LV
DD
to LGND..........................................................-0.3V to +6V
SHDN to LGND.........................................................-0.3V to +4V
SFT to LGND ............................................................-0.3V to +6V
FB_, IN_+, IN_-, REFCUR to REGP,
REGM..................................(V
REGM
- 0.3V) to (V
REGP
+ 0.3V)
BOOTR to OUTR ....................................................-0.3V to +12V
BOOTL to OUTL .....................................................-0.3V to +12V
OUTR, OUTL Shorted to LGND..................................Continuous
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
Single-Layer Board:
36-Pin TQFN (derate 26.3mW/°C above +70°C) ...........2.11W
Multilayer Board:
36-Pin TQFN (derate 35.7mW/°C above +70°C) ...........2.86W
Junction-to-Ambient Thermal Resistance (θ
JA
)
Single-Layer Board:
36-Pin TQFN.................................................................38°C/W
Multilayer Board:
36-Pin TQFN.................................................................28°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ...................1.4°C/W
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
(Note 3) 20 40 V
Supply Current I
DD
No load, output filter removed 15 mA
Mute Mode Supply Current No load, V
SFT
= 0V (outputs not switching) 8 mA
Shutdown Current No load, V
SHDN
= 0V 0.8 1.3 mA
Switching Frequency f
SW
300 kHz
Power-Supply Rejection Ratio
(Note 4)
PSRR V
DD
= 24V + 500mV
P-P
, f = 1kHz 68 dB
Crosstalk
(Notes 5 and 6)
L to R, R to L, R
L
= 8Ω, P
OUT
= 1W, f = 1kHz -78 dB
R
L
= 8Ω, f
IN
= 1kHz, THD+N = 10% 9.5
R
L
= 8Ω, f
IN
= 1kHz, THD+N = 10%,
V
DD
= 35V
20.5
Continuous Output Power
(Notes 5, 6, and 7)
P
OUT
R
L
= 4Ω, f
IN
= 1kHz, THD+N = 10% 16
W
Efficiency
(Notes 5, 6, and 7)
R
L
= 8Ω, P
OUT
= 9.5W, THD+N = 10% 92 %
Note 1: Actual power capabilities are dependent on PCB layout. See the Thermal Considerations section.