LTC1646
W
TEST DIAGRA
V
No 5V Input Mode Window Voltage
3VONLY
V
= ⎟ 5V – 3V ⎢ 5V
= 3V
= 3.3V, 3V = 3.3V
IN
3VONLY
IN IN
OUT
OUT
V
3VONLY
3.3V
V
5VIN
–V
3VONLY
5V
PWRGD
1646 T01
0V
W U
W
TI I G DIAGRA S
t
OC
Overcurrent Fault Detect
FALL TIME ≤ 1µs, 5V = 5V, 3V = 3.3V
IN IN
5V
OR 3.3V
V
V
5VSENSE
OR
3VSENSE
100mV
t
OC
FAULT
1V
1646 T02
t
SC
Short-Circuit Fault Detect
FALL TIME ≤ 30ns, 5V = 5V, 3V = 3.3V
IN IN
5V
OR 3.3V
V
V
5VSENSE
OR
3VSENSE
200mV
t
SC
FAULT
1V
1646 T03
1646fa
8