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LTC4354IS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC4354
1
4354fc
Typical applicaTion
FeaTures DescripTion
Negative Voltage
Diode-OR Controller
and Monitor
The LT C
®
4354 is a negative voltage diode-OR controller
that drives two external N-channel MOSFETs. It replaces
two Schottky diodes and the associated heat sink, saving
power and area. The power dissipation is greatly reduced
by using N-channel MOSFETs as the pass transistors.
Power sources can easily be ORed together to increase
total system power and reliability.
When first powered up, the MOSFET body diode conducts
the load current until the pass transistor is turned on.
The LTC4354 servos the voltage drop across the pass
transistors to ensure smooth transfer of current from one
transistor to the other without oscillation.
The MOSFETs are turned off in less than 1µs whenever
the corresponding power source fails or is shorted. Fast
turn-off prevents the reverse current from reaching a level
that could damage the pass transistors.
A fault detection circuit with an open-drain output capable
of driving an LED or opto-coupler indicates either MOSFET
short, MOSFET open or supply failed.
–48V Diode-OR Power Dissipation vs Load Current
applicaTions
n
Controls N-Channel MOSFETs
n
Replaces Power Schottky Diodes
n
Less Than 1µs Turn-off Time Limits Peak
Fault Current
n
80V Operation
n
Smooth Switchover without Oscillation
n
No Reverse DC Current
n
Fault Output
n
Selectable Fault Thresholds
n
Available in 8-Lead (3mm × 2mm) DFN and
8-Lead SO Packages
n
AdvancedTCA
Systems
n
–48V Distributed Power Systems
n
Computer Systems/Servers
n
Telecom Infrastructure
n
Optical Networks
L, LT , LT C , LT M, Linear Technology and the Linear logo are registered trademarks and
Hot Swap, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC4354
LOAD
DB GADA GB
V
SS
V
B
= –48V
V
A
= –48V
–48V_RTN
FAULT
IRF3710
IRF3710
4354 TA01
V
CC
33k
12k
2k2k
LED
1µF
CURRENT (A)
0
0
POWER DISSIPATION (W)
1
2
3
4
6
5
2
4 6
4354 TA01b
8 10
DIODE (MBR10100)
FET (IRF3710)
POWER
SAVED
LTC4354
2
4354fc
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4354CDDB#TRMPBF LTC4354CDDB#TRPBF LBBK
8-Lead (3mm × 2mm) Plastic DFN
0°C to 70°C
LTC4354IDDB#TRMPBF LTC4354IDDB#TRPBF LBMB
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
absoluTe MaxiMuM raTings
I
CC
(100µs duration) ...............................................50mA
Output Voltages
GA, GB .........................................–0.3V to V
CC
+ 0.3V
FAULT ...................................................... –0.3V to 7V
Input Voltages
DA, DB ................................................... –0.3V to 80V
Input Current
DA, DB Current ................................... –1mA to 20mA
(Note 1)
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4354CS8#PBF LTC4354CS8#TRPBF 4354 8-Lead Plastic SO 0°C to 70°C
LTC4354IS8#PBF LTC4354IS8#TRPBF 4354I 8-Lead Plastic SO –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TOP VIEW
9
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
5
6
7
8
4
3
2
1DA
V
SS
V
CC
GA
DB
FAULT
GB
V
SS
T
JMAX
= 125°C, θ
JA
= 76°C/W
EXPOSED PAD (PIN 9) IS V
SS
, CONNECTION TO PCB OPTIONAL
1
2
3
4
8
7
6
5
TOP VIEW
DB
FAULT
GB
V
SS
DA
V
SS
V
CC
GA
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C, θ
JA
= 150°C/W
Operating Temperature Range
LTC4354C ................................................ 0°C to 70°C
LTC4354I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
pin conFiguraTion
LTC4354
3
4354fc
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. I
CC
= 5mA, V
SS
= 0V, unless otherwise noted.
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: I
CC
is defined as the current level where the V
CC
voltage is lower
by 100mV from the value with 2mA of current.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
Z
Internal Shunt Regulator Voltage I
CC
= 5mA
l
10.25 11 11.75 V
∆V
Z
Internal Shunt Regulator Load Regulation I
CC
= 2mA to 10mA 200 300 mV
V
CC
Operating Voltage Range
l
4.5 V
Z
V
I
CC
V
CC
Supply Current V
CC
= (V
Z
– 0.1V), Note 2
V
CC
= 5V
l
l
0.5
1.2
0.8
2
1.1
mA
mA
V
GATE
GATE Pins Output High Voltage V
CC
= 10.25V
V
CC
= 5V
10
4.75
10.25 V
V
I
GATE
GATE Pins Pull-Up Current V
SD
= 60mV; V
GATE
= 5.5V
V
SD
= 0V; V
GATE
= 5.5V
–15
15
–30
30
–60
60
µA
µA
∆V
SD
Source Drain Sense Threshold Voltage (V
SS
– V
DX
)
l
10 30 55 mV
∆V
SD(F LT )
Source Drain Fault Detection Threshold (V
SS
– V
DX
); V
CC
= 7V to V
Z
l
200 260 320 mV
t
OFF
Gate Turn-Off Time in Fault Condition C
GATE
= 3300pF; V
GATE
≤ 2V; V
SD
= –0.4V 0.7 1.2 µs
V
FAULT
FAULT Pin Output Low I
FAULT
= 5mA
l
200 400 mV
I
FAULT
FAULT Pin Leakage Current V
FAULT
= 5V
l
±1 µA
I
D
Drain Pin Input Current V
DX
= 0V
V
DX
= 80V
–3.5
1.1
–2.5
1.5
–1.5
1.9
µA
mA
Note 3: An internal shunt regulator limits the V
CC
pin to less than 12V
above V
SS
. Driving this pin to voltages beyond the clamp may damage
the part.
Note 4: All currents into pins are positive
; all voltages are referenced to
V
SS
unless otherwise specified.
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC4354IS8#PBF

Mfr. #:
Buy LTC4354IS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Management Specialized - PMIC Neg V Diode-OR Cntr & Mon
Lifecycle:
New from this manufacturer.
Delivery:
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