
M
Triple USB Switch with Autoreset and
Fault Blanking
_______________________________________________________________________________________
5
M
TEMPERATURE (
°
C)
F
60
35
10
-15
110
100
120
130
140
150
160
170
180
190
200
210
220
230
240
250
-40
85
V
IN_
= 5.5V
V
IN_
= 5V
V
IN_
= 4.5V
R
PU
= 4.7k
FAULT OUTPUT LOW VOLTAGE
vs. TEMPERATURE
AUTORESET CURRENT
vs. TEMPERATURE
M
TEMPERATURE (
°
C)
A
60
35
10
-15
20
22
24
26
28
30
32
34
36
38
18
-40
85
V
IN_
= 5.5V
V
IN_
= 4.5V
V
IN_
= 5V
AUTORESET CURRENT
vs. INPUT VOLTAGE
M
INPUT VOLTAGE (V)
A
5.3
5.1
3.7 3.9 4.1
4.5 4.7
4.3
4.9
5
10
15
20
25
30
35
40
0
3.5
5.5
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +85
°
C
OVERLOAD RESPONSE INTO 2.5
10ms/div
C: V
FAULT_
5V/div
D: I
OUT_
1A/div
B
A
C
0
5V
0
D
0
A: V
IN_
5V/div
B: V
OUT_
5V/div
SHORT-CIRCUIT RESPONSE INTO 0
(EXPANDED TIME SCALE)
OVERLOAD RESPONSE INTO 2.5
(EXPANDED TIME SCALE)
MAX1940 toc14
400
μ
s/div
C: V
FAULT_
5V/div
D: I
OUT_
1A/div
B
A
C
0
5V
0
D
5V
A: V
IN_
5V/div
B: V
OUT_
5V/div
SHORT-CIRCUIT RESPONSE INTO 0
10ms/div
C: V
FAULT_
5V/div
D: I
OUT_
1A/div
B
A
C
5V
5V
0
D
5V
A: V
IN_
5V/div
B: V
OUT_
5V/div
MAX1940 toc16
400
μ
s/div
C: V
FAULT_
5V/div
D: I
IN_
2A/div
B
A
C
0
5V
0
D
5V
A: V
IN_
5V/div
B: V
OUT_
5V/div
MAX1940 toc17
1ms/div
B
A
5V
5V
A: V
ON_
5V/div
B: V
OUT_
2V/div
V
SEL
= 5V
R
OUT_
= 10
C
OUT_
= 1
μ
F
SWITCH TURN-ON TIME (t
ON
+ t
)
MAX1940 toc18
1ms/div
B
A
5V
0
A: V
ON_
5V/div
B: V
OUT_
2V/div
V
SEL
= 5V
R
OUT_
= 10
C
OUT_
= 1
μ
F
SWITCH TURN-ON TIME (t
ON
+ t
)
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V
IN_
= 5V, C
IN_
= 0.1μF, C
OUT_
= 1μF, ON_ = SEL, T
A
= +25
°
C, unless otherwise noted.)