LTC4416-1 Linear Technology, LTC4416-1 Datasheet - Page 10

• Manufacturer Part Number: LTC4416-1
• Description: Low Loss Dual PowerPath Controllers
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
differ by more than 100mV, 100% of the load will come
from the higher of V1 or V2.
The user has the option of using E1 and E2 to disable
one of the two supplies by connecting them to a digital
controller. If E1 is brought low, V1 will no longer supply
current to V
ply current to V
high, V
Figure 5 shows the same application without the shut-
down option. It has one-half the losses of Figure 4 and is
configured for 5V rails.
LTC4416/LTC4416-1
LTC4416-1
The LTC4416-1 will support all three of the LTC4416
applications without the “soft-off” feature. The only dif-
ference in the two designs is the LTC4416-1 will rapidly
switch off the load from a supply whenever a channel is
0
CONTROLLER
TO HOST
S
V1
5V
V2
5V
Figure 5. Dual PowerPath for Current Sharing
will be disabled.
S
. If E2 is brought high, V2 will no longer sup-
E1
E2
S
GND
. If E1 is brought low and E2 is brought
V1
V2
U
V1 = 12V
V2 = 12V
E1
H1
GND
E2
H2
H1
E1
GND
E2
H2
LTC4416
Figure 4
SUPPLY 1
SUPPLY 2
LTC4416
U
G1
G2
V1
V
V2
S
V1
G1
V
G2
V2
S
W
Si7495DP
Si7495DP
Si7483ADP
Q1
Q3
Si7483ADP
Q1
Q2
Q2
Q4
4416 F05
U
V
5V
S
4416 F04
V
S
HYSTERESIS
Undervoltage
disabled. This rapid turn-off feature is desirable when the
supply cannot tolerate certain voltage excursions under
load, or when the load is being protected from a rapidly
changing input supply.
Under and Overvoltage Shutdown
Refer to Figure 6 for an application circuit which disables
the power to the load when the input voltage gets too low
or too high. When V
the output is disabled until V
enabled and the load remains on the input until the supply
exceeds 13.5V. At that voltage, the V2 path is disabled. As
the input falls, the voltage source will be reconnected to
the load when the input drops to 12V and the V2 path is
enabled. Finally, the load will be removed from the input
supply when the voltage drops below 5V.
GND
V
V
TH2
IN
V
V
24.9k
WITH
R2C
FAIL
RESTORE
UV ENABLED AT 5V, V
OV ENABLED AT 13.5V, V
=
=
R2A
221k
1 222
V
HYSTERESIS
R2E
187k
.
ETH
V
=
TH1
=
1 222
24.3k
V
WITH
R1C
•
.
V
ETH
R A R c
•
1
IN
75
R c
•
IN
V
RESTORED TO LOAD WHEN V
R1A
75k
IN
+
(
1
k
R A
•
R1D
182k
RESTORED TO LOAD WHEN V
24 3
starts from zero volts, the load to
+
75 5
1
Figure 6
1
.
24 3
k
R c R D
H1
E1
GND
E2
H2
+
IN
k
LTC4416-1
24 3 182
1
+
.
(
reaches 5.5V. The V1 path is
R c R D
(
k
.
24 3 182
1
= = 4 99
k
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1
G1
G2
V1
V
V2
.
S
. V
k
1
IN
)
k
)
RISES TO 5.5V
IN
FALLS TO 12V
k
)
=
5 497
.
4416 F06
4416fa
V
V
TO
LOAD
OUT