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LT1170_15

更新时间： 2024-09-26 01:13:35
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凌特 - Linear /
页数 文件大小 规格书
24页 236K
描述
100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators

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LT1170_15 数据手册

 浏览型号LT1170_15的Datasheet PDF文件第2页浏览型号LT1170_15的Datasheet PDF文件第3页浏览型号LT1170_15的Datasheet PDF文件第4页浏览型号LT1170_15的Datasheet PDF文件第5页浏览型号LT1170_15的Datasheet PDF文件第6页浏览型号LT1170_15的Datasheet PDF文件第7页 
LT1170/LT1171/LT1172  
100kHz, 5A, 2.5A and 1.25A  
High Efficiency Switching Regulators  
FEATURES  
DESCRIPTION  
The LT®1170/LT1171/LT1172 are monolithic high power-  
switching regulators. They can be operated in all standard  
switching configurations including buck, boost, flyback,  
forward,invertingand“Cuk.”Ahighcurrent,highefficiency  
n
Wide Input Voltage Range: 3V to 60V  
n
Low Quiescent Current: 6mA  
Internal 5A Switch  
n
(2.5A for LT1171, 1.25A for LT1172)  
n
switch is included on the die along with all oscillator, con-  
trol and protection circuitry. Integration of all functions  
allowstheLT1170/LT1171/LT1172tobebuiltinastandard  
5-pin TO-3 or TO-220 power package as well as the 8-pin  
packages (LT1172). This makes them extremely easy to  
use and provides “bust proof” operation similar to that  
obtained with 3-pin linear regulators.  
Shutdown Mode Draws Only 50μA Supply Current  
n
Very Few External Parts Required  
Self-Protected Against Overloads  
n
n
Operates in Nearly All Switching Topologies  
n
Flyback-Regulated Mode Has Fully Floating Outputs  
n
Comes in Standard 5-Pin Packages  
n
n
LT1172 Available in 8-Pin MiniDIP and  
Surface Mount Packages  
The LT1170/LT1171/LT1172 operate with supply voltages  
from 3V to 60V, and draw only 6mA quiescent current.  
They can deliver load power up to 100W with no exter-  
nal power devices. By utilizing current-mode switching  
techniques, they provide excellent AC and DC load and  
line regulation.  
Can Be Externally Synchronized  
APPLICATIONS  
n
Logic Supply 5V at 10A  
n
5V Logic to 15V Op Amp Supply  
n
Battery Upconverter  
TheLT1170/LT1171/LT1172havemanyuniquefeaturesnot  
found even on the vastly more difficult to use low power  
controlchipspresentlyavailable.Theyuseadaptiveantisat  
switch drive to allow very wide ranging load currents with  
no loss in efficiency. An externally activated shutdown  
mode reduces total supply current to 50μA typically for  
standby operation.  
n
Power Inverter (+ to –) or (– to +)  
n
Fully Floating Multiple Outputs  
USER NOTE:  
This data sheet is only intended to provide specifications, graphs, and a general functional  
description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability  
of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in  
developing new designs. This manual contains a comprehensive discussion of both the LT1070  
and the external components used with it, as well as complete formulas for calculating the values  
of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in  
the higher frequency. A CAD design program called SwitcherCAD® is also available.  
L, LT, LTC, LTM, Linear Technology, the Linear logo and SwitcherCAD are registered  
trademarks of Linear Technology Corporation. All other trademarks are the property of their  
respective owners.  
TYPICAL APPLICATION  
Boost Converter (5V to 12V)  
Maximum Output Power*  
100  
* ROUGH GUIDE ONLY. BUCK MODE  
L1**  
5V  
L2  
OUTPUT  
FILTER  
LT1170  
P
= (5A)(V  
)
50μH  
OUT  
OUT  
10μH  
SPECIAL TOPOLOGIES DELIVER  
MORE POWER.  
80  
60  
40  
20  
0
C3  
100μF  
** DIVIDE VERTICAL POWER SCALE  
BY TWO FOR LT1171, BY FOUR  
FOR LT1172.  
BUCK-BOOST  
= 30V  
D1  
V
O
V
IN  
MBR330  
12V  
1A  
BOOST  
V
SW  
LT1170/1/2 TA02  
FLYBACK  
+
R1  
C2  
1000μF  
10.7k  
LT1170  
+
1%  
C3*  
100μF  
FB  
V
C
GND  
BUCK-BOOST  
R2  
1.24k  
1%  
V
= 5V  
R3  
1k  
C1  
1μF  
O
0
10  
20  
30  
40  
50  
INPUT VOLTAGE (V)  
*REQUIRED IF INPUT LEADS r 2"  
** COILTRONICS 50-2-52  
PULSE ENGINEERING 92114  
1170/1/2 TA01  
117012fg  
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