Datasheet

8 ______________________________________________________________________________________
MAX98502
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Typical Operating Characteristics (continued)
(V
BAT
= 3.6V, R
L
= ∞ between SPKP and SPKN, A
V
= +15.5dB, RKNEE = V
BAT
, 20Hz to 22kHz AC measurement bandwidth, unless
otherwise noted.)
Boost Converter
IN-BAND OUTPUT SPECTRUM
MAX98502 toc22
FREQUENCY (kHz)
AMPLITUDE (dBV)
15105
-100
-80
-60
-40
-20
0
-120
02
0
f
IN
= 1kHz
Z
LOAD
= 4
I
+ 33µH
EFFICIENCY vs. OUTPUT POWER
MAX98502 toc23
I
LOAD
(mA)
EFFICIENCY (%)
140012001000800600400200
75
80
85
90
95
100
70
0 1600
V
BAT
= 5V
V
BAT
= 3V
V
BAT
= 3.3V
V
BAT
= 3.6V
V
BAT
= 4.2V
V
BAT
= 4V
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX98502 toc25
I
LOAD
(A)
OUTPUT VOLTAGE (V) (%)
140012001000800600400200
5.51
5.52
5.53
5.54
5.55
5.56
5.50
0 1600
V
BAT
= 5V
V
BAT
= 3V
V
BAT
= 3.3V
V
BAT
= 3.6V
V
BAT
= 4.2V
LOAD REGULATION
MAX98502 toc24
I
LOAD
(A)
LOAD REGULATION (%)
140012001000800600400200
-0.8
-0.6
-0.4
-0.2
0
1.0
-1.0
0 1600
V
BAT
= 5V
V
BAT
= 3V
V
BAT
= 3.3V
V
BAT
= 3.6V
V
BAT
= 5V
V
BAT
= 4V
SWITCHING FREQUENCY
vs. BATTERY VOLTAGE
MAX98502 toc26
BATTERY VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
5.04.54.03.53.0
1.98
2.00
2.02
2.04
I
OUT
= 500mA
I
OUT
= 100mA
1.96
2.5 5.5
SOFT-START
MAX98502 toc27
V
CCOUT
2V/div
2ms/div
SDBST