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LTC4416IMS-1#PBF

P1-P3P4-P6P7-P9P10-P12
LTC4416/LTC4416-1
10
4416fa
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
S
. If E2 is brought high, V2 will no longer sup-
ply current to V
S
. If E1 is brought low and E2 is brought
high, V
S
will be disabled.
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.
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
IN
starts from zero volts, the load to
the output is disabled until V
IN
reaches 5.5V. The V1 path is
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.
APPLICATIO S I FOR ATIO
W UU
U
LTC4416
V2 = 12V
V1 = 12V
Si7483ADP
Si7483ADP
E1
H1
GND
E2
H2
V1
G1
V
S
G2
V2
V1
GND
TO HOST
CONTROLLER
E1
E2
V2
V
S
Q3 Q4
Q1 Q2
4416 F04
LTC4416
SUPPLY 2
SUPPLY 1
Q2
Si7495DP
Q1
Si7495DP
H1
E1
GND
E2
H2
V1
G1
V
S
G2
V2
V1
5V
V2
5V
V
S
5V
4416 F05
Figure 4
Figure 5. Dual PowerPath for Current Sharing
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
LTC4416-1
H1
E1
GND
E2
H2
G1
V1
V
S
V2
G2
R1D
182k
R1C
24.3k
R2C
24.9k
GND
V
IN
R2E
187k
V
TH1
WITH
HYSTERESIS
V
TH2
WITH
HYSTERESIS
V
OUT
TO
LOAD
4416 F06
R1A
75k
R2A
221k
UV ENABLED AT 5V, V
IN
RESTORED TO LOAD WHEN V
IN
RISES TO 5.5V
OV ENABLED AT 13.5V, V
IN
RESTORED TO LOAD WHEN V
IN
FALLS TO 12V
Figure 6
Undervoltage
V V
R A R C
R C
V
k k
k
FAIL ETH
=
+
=
+
•
. •
.
.
1 1
1
1 222
75 24 3
24 3
== 4 99. V
V V
R A R C R D
R C R D
V
RESTORE ETH
=
+
( )
( )
=
•
. •
1 1 1
1 1
1 222
755 24 3 182
24 3 182
5 497
k k k
k k
V
+
( )
=
.
.
.
LTC4416/LTC4416-1
11
4416fa
Overvoltage
V V
R A R C R E
R C R E
V
k
FAIL ETH
=
+
=
•
||
||
. •
2 2 2
2 2
1 222
221 ++
=
24 9 187
24 9 187
13 51
. ||
. ||
.
k k
k k
V
V V
R A R C
R C
V
k k
RESTORE ETH
=
+
=
+
•
. •
.
2 2
2
1 222
221 24 9
244 9
12 07
.
.
k
V=
The over and undervoltage lockout circuits are shown here
working in tandem. It is possible to configure the circuit
for either over or undervoltage lockout by using only one
of the voltage paths and eliminating the components from
the other. Refer to Figure 7 for an LTC4416-1 configured
for overvotlage protection. If the input does not go below
ground, transistor Q1 can be eliminated.
The LTC4416-1 should be used in this configuration rather
than the LTC4416 because the LTC4416-1 will turn-off
rapidly if an over or undervoltage condition is detected.
Refer to Figure 8 for a comparison of the transient response
of the two ICs using the circuit configuration of Figure 6.
The LTC4416 will not turn-off quickly in an overvoltage
or undervoltage condition because the “fast-off” feature
is not enabled. This will cause the output to travel beyond
the desired range.
APPLICATIO S I FOR ATIO
W UU
U
Figure 9 contains a rapidly changing input voltage on a
much smaller time scale in comparison to Figure 8. The
LTC4416 will require the t
E(OFF)
time prior to the rapid pull-
up current being applied. The gate voltage will be pulled
high with I
G(OFF)
which has a minimum current of 500µA.
The discharge time of the gate will be dependent on the
capacitance of the external FET and the initial gate-source
voltage of the circuit. The total time delay will equal:
t t t
t
C V
I
DELAY E OFF DISCHARGE
E OFF
GS
G
= +
= +
( )
( )
(
• ∆
OOFF)
Figure 8. Transient Response of the LTC4416 vs the LTC4416-1
Light Load with a Large Capacitor on V
OUT
Figure 9. Close Up of the Transient Response of the LTC4416-1
to a Rapidly Rising Input
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 7. LTC4416-1 Configured for Overvoltage Protection
LTC4416-1
H1
E1
GND
E2
H2
G1
V1
V
S
V2
G2
R2C
24.9k
GND
V
IN
R2E
187k
V
TH2
WITH
HYSTERESIS
V
OUT
TO
LOAD
4416 F07
R1A
100k
Q1 Q2
R2A
221k
5
0
0 20
V
IN
V
OUT
LTC4416-1
V
OUT
LTC4416
40
TIME (ms) 4416 F08
60 80
10
VOLTAGE (V)
15
20
V
OUT
LTC4416-1
V
OUT
LTC4416
13.40
13.45
LTC4416-1
GATE DISCHARGE TIME
= C
13.50
13.55
13.60
V
IN
LTC4416
0
0 10 20
TIME (µs) 4416 F09
305 15
t
E(OFF)
25 35 40
VOLTAGE (V)
∆V
I
G(OFF)
LTC4416/LTC4416-1
12
4416fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2005
LT 0507 REV A • PRINTED IN USA
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PACKAGE DESCRIPTIO
U
MSOP (MS) 0603
0.53 ± 0.152
(.021 ± .006)
SEATING
PLANE
0.18
(.007)
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
TYP
0.127 ± 0.076
(.005 ± .003)
0.86
(.034)
REF
0.50
(.0197)
BSC
1 2
3
4 5
4.90 ± 0.152
(.193 ± .006)
0.497 ± 0.076
(.0196 ± .003)
REF
8910
7
6
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.254
(.010)
0° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.889 ± 0.127
(.035 ± .005)
RECOMMENDED SOLDER PAD LAYOUT
0.305 ± 0.038
(.0120 ± .0015)
TYP
0.50
(.0197)
BSC
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
P1-P3P4-P6P7-P9P10-P12

LTC4416IMS-1#PBF

Mfr. #:
Buy LTC4416IMS-1#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Management Specialized - PMIC 36V, L Loss 2x PwrPath Cntrs for Lrg PFE
Lifecycle:
New from this manufacturer.
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