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LTC1174CN8-3.3#PBF PDF预览

LTC1174CN8-3.3#PBF

更新时间： 2024-11-23 06:46:23
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
20页 256K
描述
High Efficiency Step-Down and Inverting DC/DC Converter

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LTC1174CN8-3.3#PBF 数据手册

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LTC1174  
LTC1174-3.3/LTC1174-5  
High Efficiency  
Step-Down and Inverting  
DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
The LTC®1174 is a simple current mode DC/DC converter  
ideally suited for 9V to 5V, 5V to 3.3V or 5V to –5V  
operation. With an internal 0.9Ω switch (at a supply  
voltage of 9V), the LTC1174 requires only four external  
components to construct a complete high efficiency  
DC/DC converter.  
■
High Efficiency: Up to 94%  
■
Peak Inductor Current Independent of  
Inductor Value  
Short-Circuit Protection  
■
■
Optimized for 5V to –5V Applications  
■
Wide VIN Range: 4V to 18.5V  
■
Low Dropout Operation  
UnderanoloadconditiontheLTC1174drawsonly130µA.  
In shutdown, it draws a mere 1µA making this converter  
ideal for current sensitive applications. In dropout, the  
internal P-channel MOSFET switch is turned on continu-  
ously allowing the user to maximize the life of the battery  
source.  
■
Low-Battery Detector  
■
Pin Selectable Current Limit  
■
Internal 0.9Ω Power Switch: VIN = 9V  
■
Only Four External Components Required  
■
130µA Standby Current  
■
Active Low Micropower Shutdown  
The maximum inductor current of the LTC1174 family is  
pin selectable to either 340mA or 600mA, optimizing  
efficiency for a wide range of applications. Operation up to  
200kHz permits the use of small surface mount inductors  
and capacitors.  
U
APPLICATIO S  
■
Distributed Power Systems  
■
Step-Down Converters  
■
Inverting Converters  
For applications requiring higher output current or ultra-  
high efficiency, see the LTC1148 data sheet.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Memory Backup Supply  
■
Portable Instruments  
■
Battery-Powered Equipment  
U
TYPICAL APPLICATIO  
High Efficiency Step-Down Converter  
LTC1174-5 Efficiency  
100  
V
IN  
9V  
95  
15µF*  
25V  
+
6
V
= 6V  
IN  
V
IN  
×3  
3
2
8
1
5
90  
85  
80  
75  
70  
LB  
LB  
SHUTDOWN  
IN  
V
= 9V  
IN  
V
OUT  
OUT  
SW  
5V  
175mA  
7
I
PGM  
100µH†  
LTC1174-5  
+
100µF**  
10V  
1N5818  
GND  
4
L = 100µH  
V
= 5V  
= 0V  
OUT  
PGM  
1174 TA01  
I
(3) AVX TPSD156K025  
AVX TPSD107K010  
*
**  
1
10  
LOAD CURRENT (mA)  
100 200  
† COILTRONICS CTX100-4  
1174 TA02  
1174fe  
1
1234567...20

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