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Linear Technology DC852A - LTC4354 Negative Voltage Diode-OR Controller and Monitor DC852A DC852A Datenbogen

Produktcode
DC852A
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LTC4354
1
4354fc
Typical applicaTion 
FeaTures
DescripTion
Negative Voltage 
Diode-OR Controller  
and Monitor
The LTC
®
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, LTC, LTM, 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
GA
DA
GB
V
SS
V
B
 = –48V
V
A
 = –48V
–48V_RTN
FAULT
IRF3710
IRF3710
4354 TA01
V
CC
33k
12k
2k
2k
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