Image LTC4355
型号: LTC4355
厂商: Linear Technology Linear Technology
标准:
分类: 集成电路
描述: positive high voltage ideal diode-OR with input supply and fuse monitors
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LTC4355  
Positive High Voltage  
Ideal Diode-OR with Input Supply  
and Fuse Monitors  
FeaTures  
DescripTion  
TheLTC®4355isapositivevoltageidealdiode-ORcontroller  
that drives two external N-channel MOSFETs. Forming the  
diode-OR with N-channel MOSFETs instead of Schottky  
diodes reduces power consumption, heat dissipation and  
PC board area.  
Replaces Power Schottky Diodes  
Controls N-Channel MOSFETs  
0.5µs Turn-Off Time Limits Peak Fault Current  
Wide Operating Voltage Range: 9V to 80V  
Smooth Switchover without Oscillation  
No Reverse DC Current  
With the LTC4355, power sources can easily be ORed  
together to increase total system reliability. The LTC4355  
can diode-OR two positive supplies or the return paths of  
two negative supplies, such as in a 48V system.  
Monitors V , Fuse, and MOSFET Diode  
IN  
Available in 14-Lead (4mm × 3mm) DFN and  
16-Lead SO Packages  
In the forward direction the LTC4355 controls the voltage  
dropacrosstheMOSFETtoensuresmoothcurrenttransfer  
from one path to the other without oscillation. If a power  
source fails or is shorted, fast turnoff minimizes reverse  
current transients.  
applicaTions  
High Availability Systems  
AdvancedTCA® (ATCA) Systems  
+48V and –48V Distributed Power Systems  
Telecom Infrastructure  
Power fault detection indicates if the input supplies are  
not in regulation, the inline fuses are blown, or the  
voltages across the MOSFETs are greater than the fault  
threshold.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Typical applicaTion  
+48V Diode-OR  
Power Dissipation vs Load Current  
7A  
7A  
FDB3632  
TO  
V
V
= +48V  
= +48V  
IN1  
IN2  
6
LOAD  
FDB3632  
5
22k  
22k  
22k  
DIODE (MBR10100)  
4
3
340k  
340k  
22k  
22k  
IN1 GATE1 IN2 GATE2 OUT  
POWER  
SAVED  
MON1  
VDSFLT  
FUSEFLT1  
FUSEFLT2  
PWRFLT1  
PWRFLT2  
LTC4355  
GND  
2
1
0
SET  
MON2  
FET (FDB3632)  
12.7k  
12.7k  
GREEN LEDs  
PANASONIC LN1351C  
0
2
4
6
8
10  
GND  
CURRENT (A)  
4355 TA01  
4355 TA02  
4355fa  

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