Datasheet

3Maxim Integrated
Mono 3.2W Class D Amplifier
MAX98304
ELECTRICAL CHARACTERISTICS (continued)
(V
PVDD
= V
SHDN
= 5.0V, V
PGND
= 0V, A
V
= 12dB (GAIN = PGND), R
L
= J, R
L
connected between OUT+ to OUT-, AC measurement
bandwidth 20Hz to 22kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25NC.) (Notes 1, 2)
Note 1: This device is 100% production tested at +25NC. All temperature limits are guaranteed by design.
Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 4I,
L = 33FH. For R
L
= 8I, L = 68FH.
Note 3: Amplifier inputs AC-coupled to ground.
Note 4: Mode transitions controlled by SHDN.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Rejection Ratio
(Note 3)
PSRR
V
PVDD
= 2.5V to 5.5V, T
A
= +25NC
72 90
dB
V
RIPPLE
= 200mV
P-P
f = 217Hz 80
f = 1kHz 84
f = 20kHz 84
Output Power P
OUT
THD+N = 10%,
f = 1kHz,
R
L
= 4I + 33FH
V
PVDD
= 5.0V 3.2
W
V
PVDD
= 4.2V 2.2
V
PVDD
= 3.7V 1.7
THD+N = 1%,
f = 1kHz,
R
L
= 4I + 33FH
V
PVDD
= 5.0V 2.6
V
PVDD
= 4.2V 1.8
V
PVDD
= 3.7V 1.4
THD+N = 10%,
f = 1kHz,
R
L
= 8I + 68FH
V
PVDD
= 5.0V 1.8
V
PVDD
= 4.2V 1.2
V
PVDD
= 3.7V 0.96
THD+N = 1%,
f = 1kHz,
R
L
= 8I + 68FH
V
PVDD
= 5.0V 1.4
V
PVDD
= 4.2V 1
V
PVDD
= 3.7V 0.8
Total Harmonic Distortion
Plus Noise
THD+N f
IN
= 1kHz
R
L
= 4I
P
OUT
= 1W
0.03 0.1
%
R
L
= 8I
P
OUT
= 0.7W
0.03
Oscillator Frequency f
OSC
300 kHz
Spread-Spectrum Bandwidth
±12.5
kHz
Efficiency
E P
OUT
= 1.75W, R
L
= 8I
93 %
Noise V
N
A-weighted (Note 3)
A
V
= 12dB 31
FV
RMS
A
V
= 9dB 26
A
V
= 6dB 23
A
V
= 3dB 21
A
V
= 0dB 19
Output Current Limit I
LIM
2.8 A
Thermal Shutdown Level 155
NC
Thermal Shutdown Hysteresis 15
NC
DIGITAL INPUT (SHDN)
Input-Voltage High V
INH
V
PVDD
= 2.5V to 5.5V 1.4 V
Input-Voltage Low V
INL
V
PVDD
= 2.5V to 5.5V 0.4 V
Input Leakage Current
T
A
= +25NC Q1 FA