Typical operating characteristics (continued) – Rainbow Electronics MAX5079 User Manual
Page 5
MAX5079
ORing MOSFET Controller with
Ultra-Fast 200ns Turn-Off
_______________________________________________________________________________________
5
0
20
10
40
30
60
50
70
90
80
100
0
0.2 0.3 0.4
0.1
0.5 0.6 0.7
0.9
0.8
1.0
SLOW-COMPARATOR BLANKING TIME
t
STH
vs. C
STH
(R
STH
= 180k
Ω)
MAX5079 toc04
C
STH
(
µF)
t
STH
(ms)
75mV OVERDRIVE
FAST-COMPARATOR REVERSE VOLTAGE
THRESHOLD (V
FTH
vs. R
FTH
)
MAX5079 toc05
R
FTH
(k
Ω)
V
FTH
(V)
140
120
80
100
40
60
20
0.1
0.3
0.5
0.2
0.4
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
0
0
T
A
= +125
°C
T
A
= +85
°C
T
A
= -40
°C
FAST-COMPARATOR RESPONSE TIME
MAX5079 toc06
TEMPERATURE (
°C)
t
RESPONSE
(ns)
110
95
65 80
-10 5
20 35 50
-25
8
16
24
32
40
48
56
64
72
80
0
-40
125
V
IN
= 5V, V
AUXIN
= 0V
V
IN
= 1V, V
AUXIN
= 5V
V
IN
= 2.75V,
V
AUXIN
= 12V
V
IN
= 12V,
V
AUXIN
= 0V
CHARGE-PUMP FREQUENCY
vs. INPUT VOLTAGE
MAX5079 toc07
V
IN
(V)
f
CP
(kHz)
14
12
10 11
13
9
7 8
2 3 4 5 6
1
62
64
66
68
70
72
74
76
78
80
60
0
15
T
A
= +125
°C
T
A
= +85
°C
T
A
= +25
°C
T
A
= -40
°C
GATE-CHARGE CURRENT vs. C
EXT
MAX5079 toc08
C
EXT
(nF)
GATE-CHARGE CURRENT (mA)
10
0.5
1.0
1.5
2.0
2.5
3.5
4.0
4.5
5.0
6.0
0
1
100
V
IN
= 12V
3.0
5.5
FAULT CURRENT WAVEFORM
(IN SHORTED TO PGND)
MAX5079 toc09
V
IN
= 5V, V
BUS
= 5V,
V
AUXIN
= 0V, C
STH
= 0,
R
STH
= OPEN, R
FTH
= 0,
UVLO = IN
BUS
5V/div
IN
5V/div
GATE
10V/div
MOSFET REVERSE
CURRENT
5A/div
400ns/div
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted. See the Typical Operating Circuit.)