Datasheet

MAX8655
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
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Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
MAXIMUM OUTPUT CURRENT
vs. EXPOSED PAD TEMPERATURE
(CIRCUIT OF FIGURE 4)
EXPOSED PAD TEMPERATURE (°C)
OUTPUT CURRENT (A)
MAX8655 toc15
-40 80 10040020-20 60 120
0
5
10
15
20
25
30
EFFICIENCY vs. INPUT VOLTAGE
(CIRCUIT OF FIGURE 4)
INPUT VOLTAGE (V)
EFFICIENCY (%)
MAX8655 toc16
5 8 11 14 17 20
0
10
20
30
40
50
60
70
80
90
100
V
OUT
= 3.3V
10A LOAD
EFFICIENCY vs. OUTPUT VOLTAGE
(CIRCUIT OF FIGURE 4)
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
MAX8655 toc17
1.0 1.5 2.0 2.5 3.0 3.5
0
10
20
30
40
50
60
70
80
90
100
12V INPUT
10A LOAD
EFFICIENCY vs. LOAD CURRENT
12V INPUT, 3.3V OUTPUT
(CIRCUIT OF FIGURE 4)
LOAD CURRENT (A)
EFFICIENCY (%)
MAX8655 toc18
0
10
20
30
40
50
60
70
80
90
100
1 10 100
EFFICIENCY vs. FREQUENCY
12V INPUT 3.3V OUTPUT
(CIRCUIT OF FIGURE 4)
FREQUENCY (kHz)
EFFICIENCY (%)
MAX8655 toc19
200 300 400 500 600 700 800
0
10
20
30
40
50
60
70
80
90
100
10A LOAD
R
VALLEY
vs. VALLEY CURRENT LIMIT
VALLEY CURRENT LIMIT (A)
R
VALLEY
(kΩ)
MAX8655 toc20
0 5 10 15 20 25
0
20
40
60
80
100
120
140
160
180
200
BOTTOM LAYER PCB TEMPERATURE vs.
OUTPUT CURRENT
I
OUT
(A)
BOTTOM PCB TEMPERATURE (°C)
MAX8655 toc21
0 5 10 15 20 25
0
120
80
20
100
40
60
V
IN
= 12V, V
OUT
= 1.2V
OUTPUT-CURRENT CAPABILITY
vs. AMBIENT TEMPERATURE
AMBIENT TEMPERATURE (°C)
OUTPUT-CURRENT CAPABILITY (A)
MAX8655 toc22
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
30
20
5
25
10
15
300 LFM
100 LFM
NO AIRFLOW