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LTC4414

更新时间： 2024-09-24 04:28:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
12页 162K
描述
36V, Low Loss PowerPathTM Controller for Large PFETs

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中文翻译

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LTC4414 数据手册

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LTC4414  
36V, Low Loss PowerPathTM  
Controller for Large PFETs  
U
FEATURES  
DESCRIPTIO  
The LTC®4414 controls an external P-channel MOSFET to  
create a near ideal diode function for power switchover.  
This permits highly efficient OR’ing of multiple power  
sourcesforextendedbatterylifeandlowself-heating.When  
conducting, the voltage drop across the MOSFET is typi-  
cally20mV.Forapplicationswithawalladapterorotheraux-  
iliarypowersource,theloadisautomaticallydisconnected  
from the battery when the auxiliary source is connected.  
Two or more LTC4414s may be interconnected to allow  
switchover between multiple batteries or charging of mul-  
tiple batteries from a single charger.  
■
Designed Specifically to Drive Large QG PFETs  
■
Very Low Loss Replacement for Power Supply  
OR’ing Diodes  
■
3.5V to 36V AC/DC Adapter Voltage Range  
■
Minimal External Components  
■
Automatic Switching Between DC Sources  
■
Low Quiescent Current: 30µA  
■
3V to 36V Battery Voltage Range  
■
Limited Reverse Battery Protection  
■
MOSFET Gate Protection Clamp  
■
Manual Control Input  
■
Space Saving 8-Lead MSOP Package  
The wide supply operating range supports operation from  
one to eight Li-Ion cells in series. The low quiescent  
current (30µA typical) is independent of the load current.  
The gate driver includes an internal voltage clamp for  
MOSFET protection.  
U
APPLICATIO S  
■
High Current Power Path Switch  
■
Industrial and Automotive Applications  
The STAT pin can be used to enable an auxiliary P-channel  
MOSFET power switch when an auxiliary supply is  
detected. This pin may also be used to indicate to a micro-  
controller that an auxiliary supply is connected. The con-  
trol (CTL) input enables the user to force the primary  
MOSFET off and the STAT pin low.  
■
Uninterruptable Power Supplies  
■
Logic Controlled Power Switch  
■
Battery Backup Systems  
■
Emergency Systems with Battery Backups  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
The LTC4414 is available in a low profile 8-lead MSOP  
package.  
U
TYPICAL APPLICATIO  
LTC4414 vs Schottky Diode Forward Voltage Drop  
8.0  
Automatic Switchover of Load Between a Battery and a Power Supply  
CONSTANT  
UPS840  
POWER  
R
ON  
SUPPLY  
INPUT  
3.6  
SUP75P03_07  
TO LOAD  
BATTERY  
CELL(S)  
LTC4414  
C
OUT  
LTC4414  
SENSE  
V
CC  
V
IN  
CONSTANT  
VOLTAGE  
GND GATE  
CTL STAT  
470k  
SCHOTTKY  
DIODE  
STATUS OUTPUT  
LOW WHEN POWER  
SUPPLY PRESENT  
4414 TA01  
NC  
NC  
0
0.02  
0.5  
FORWARD VOLTAGE (V)  
4414 TA01b  
4414fc  
1
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