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LTC1174HVCS8#TR PDF预览

LTC1174HVCS8#TR

更新时间: 2024-11-10 09:29:51
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 256K
描述
LTC1174 - High Efficiency Step-Down and Inverting DC/DC Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C

LTC1174HVCS8#TR 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 0.9switch (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 0.9Power 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

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