Datasheet

MAX8576–MAX8579
3V to 28V Input, Low-Cost, Hysteretic
Synchronous Step-Down Controllers
_______________________________________________________________________________________ 5
EFFICIENCY vs. LOAD CURRENT
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
101
10
20
30
40
50
60
70
80
90
100
0
0.1 100
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
IN
= 12V
EFFICIENCY vs. LOAD CURRENT
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
1
10
20
30
40
50
60
70
80
90
100
0
0.1 10
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
IN
= 12V
LOAD REGULATION
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc03
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
105
1.76
1.77
1.78
1.79
1.80
1.81
1.82
1.83
1.84
1.75
015
LINE REGULATION
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc04
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
201510
1.80
1.81
1.82
1.83
1.84
1.85
1.79
525
0A LOAD
15A LOAD
LINE REGULATION
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
201510
1.72
1.74
1.78
1.80
1.82
1.84
1.86
1.70
525
NO LOAD
5A LOAD
1.76
SWITCHING FREQUENCY vs. INPUT
VOLTAGE (CIRCUIT OF FIGURE 3)
MAX8576-79 toc06
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
201510
250
300
350
400
500
550
600
200
525
450
LOAD TRANSIENT
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc07
40μs/div
I
OUT
V
OUT
50mV/div
AC-COUPLED
6A
12A
LOAD TRANSIENT
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc08
40μs/div
I
OUT
V
OUT
50mV/div
AC-COUPLED
5A
2.5A
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)