Datasheet

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 0.40.1 0.5 0.6 0.7 0.90.8 1.0
SLOW-COMPARATOR BLANKING TIME
t
STH
vs. C
STH
(R
STH
= 180kΩ)
MAX5079 toc04
C
STH
(
µ
F)
t
STH
(ms)
75mV OVERDRIVE
FAST-COMPARATOR REVERSE VOLTAGE
THRESHOLD (V
FTH
vs. R
FTH
)
MAX5079 toc05
R
FTH
(kΩ)
V
FTH
(V)
14012080 10040 6020
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)
1109565 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)
141210 11 1397 82 3 4 5 61
62
64
66
68
70
72
74
76
78
80
60
015
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 .)