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LTC4235 PDF预览

LTC4235

更新时间: 2024-11-22 01:10:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 563K
描述
Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor

LTC4235 数据手册

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LTC4236  
Dual Ideal Diode-OR and  
Single Hot Swap Controller  
with Current Monitor  
DescripTion  
The LTC®4236 offers ideal diode-OR and Hot Swap func-  
tions for two power rails by controlling external N-channel  
MOSFETs. MOSFETs acting as ideal diodes replace two  
highpowerSchottkydiodesandtheassociatedheatsinks,  
savingpowerandboardarea.AHotSwapcontrolMOSFET  
allows a board to be safely inserted and removed from a  
livebackplanebylimitinginrushcurrent.Thesupplyoutput  
is also protected against short-circuit faults with a fast  
actingfoldbackcurrentlimitandelectroniccircuitbreaker.  
FeaTures  
n
Ideal Diode-OR and Inrush Current Control for  
Redundant Supplies  
Low Loss Replacement for Power Schottky Diodes  
Enables Safe Board Insertion into a Live Backplane  
2.9V to 18V Operating Range  
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Current Monitor Output  
Controls N-Channel MOSFETs  
Limits Peak Fault Current in ≤ 1µs  
Adjustable Current Limit with Foldback  
Adjustable Start-Up and Current Limit Fault Delay  
0.5µs Ideal Diode Turn-On and Turn-Off Time  
Smooth Switchover without Oscillation  
Fault, Power Good and Diode Status Outputs  
LTC4236-1: Latch Off After Fault  
The LTC4236 regulates the forward voltage drop across  
theidealdiodeMOSFETstoensuresmoothcurrenttransfer  
from one supply to the other without oscillation. The ideal  
diode MOSFETs turn on quickly to reduce the load voltage  
droop during supply switchover. If the input supply fails  
or is shorted, a fast turn-off minimizes reverse current  
transients.  
LTC4236-2: Automatic Retry After Fault  
28-Pin 4mm x 5mm QFN Package  
A current sense amplifier translates the voltage across the  
senseresistortoagroundreferencedsignal.TheLTC4236  
provides adjustable start-up delay, turn-on/-off control,  
and reports fault and power good status for the supply.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 7920013, 8022679.  
applicaTions  
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Redundant Power Supplies  
High Availability Systems and Servers  
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Telecom and Network Infrastructure  
Typical applicaTion  
Ideal Diode-OR with Hot Swap Application  
SiR158DP  
Smooth Supply Switchover  
12V  
12V  
IN2  
0.1µF  
SiR158DP  
0.003Ω  
SiR158DP  
12V  
7A  
IN1  
+
IN1  
1V/DIV  
0.1µF  
0.1µF  
C
LOAD  
IN2  
1V/DIV  
+
+
13.7k  
2k  
CPO1 IN1 DGATE1 CPO2 D2SRC IN2 DGATE2  
ON  
REG SENSE CS  
SENSE HGATE OUT  
15k  
2k  
I
IN1  
FB  
2A/DIV  
I
IN2  
2A/DIV  
LTC4236  
FAULT  
PWRGD  
DSTAT1  
DSTAT2  
4236 TA01b  
200ms/DIV  
EN  
IMON  
FTMR  
ADC  
INTV  
CC  
0.1µF  
GND  
D2OFF  
DTMR  
0.1µF  
0.1µF  
4236 TA01a  
4236f  
1
For more information www.linear.com/LTC4236  

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