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LTC1574-3.3

更新时间： 2024-11-24 22:15:15
品牌 Logo 应用领域
凌特 - Linear 转换器肖特基二极管
页数 文件大小 规格书
8页 228K
描述
High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode

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LTC1574-3.3 数据手册

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LTC1574  
LTC1574-3.3/LTC1574-5  
High Efficiency Step-Down  
DC/DC Converters  
with Internal Schottky Diode  
U
FEATURES  
DESCRIPTION  
The LTC®1574 is a family of easy-to-use current mode  
DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V  
and inverting operation. With an internal 0.9Ω switch (at  
a supply voltage of 12V) and a low forward drop Schottky  
diode (0.450V typ at 200mA, TA = 25°C), the LTC1574  
requires only three external components to construct a  
complete high efficiency DC/DC converter.  
■
High Efficiency: Up to 94%  
■
Usable in Noise-Sensitive Products  
■
Peak Inductor Current Independent of Inductor Value  
■
Short-Circuit Protection  
■
Internal Low Forward Drop Schottky Diode  
■
Only Three External Components Required  
■
Wide VIN Range: 4V to 18.5V (Absolute Maximum)  
Low Dropout Operation  
Low-Battery Detector  
■
Under no load condition, the LTC1574 draws only 130µA.  
In shutdown, it draws a mere 2µA making this converter  
ideal for battery-powered 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.  
■
■
Pin Selectable Current Limit  
■
Internal 0.9Ω Power Switch: VIN = 12V  
■
Standby Current: 130µA  
■
Active Low Micropower Shutdown  
U
The maximum inductor current of the LTC1574 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.  
APPLICATIONS  
■
Inverting Converters  
■
Step-Down Converters  
■
Memory Backup Supply  
■
Portable Instruments  
For applications requiring higher output current or ultra-  
highefficiency,seetheLTC1148andLTC1265datasheets.  
For detailed applications information, see the LTC1174  
data sheet.  
■
Battery-Powered Equipment  
■
Distributed Power Systems  
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
LTC1574-5 Efficiency  
High Efficiency Step-Down Converter  
100  
V
IN  
L = 100µH  
5.5V to  
16V  
V
= 5V  
= 0V  
OUT  
I
PGM  
95  
90  
85  
80  
75  
70  
V
= 6V  
= 9V  
+
IN  
5
22µF*  
V
35V  
IN  
12  
11  
6
7
LB  
LB  
SHDN  
IN  
V
IN  
10  
LTC1574-5  
V
OUT  
OUT  
†
100µH  
5V  
175mA  
3, 14  
I
SW  
PGM  
+
100µF*  
10V  
GND  
2, 4, 13, 15  
*
AVX TPSD226K035  
1574 TA01  
** AVX TPSD107K010  
1
10  
LOAD CURRENT (mA)  
100 200  
†
COILTRONICS CTX100-4  
1574 TA02  
1
12345678

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