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LTC3406-1.2 PDF预览

LTC3406-1.2

更新时间： 2024-09-24 04:43:39
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
12页 232K
描述
1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

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中文翻译

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LTC3406-1.2 数据手册

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LTC3406-1.2  
1.5MHz, 600mA  
Synchronous Step-Down  
Regulator in ThinSOT  
U
FEATURES  
DESCRIPTIO  
The LTC®3406-1.2 is a high efficiency monolithic syn-  
chronous buck regulator using a constant frequency,  
current mode architecture. Supply current during opera-  
tion with only 20µA drops <1µA in shutdown. The 2.5V to  
5.5V input voltage range makes the LTC3406-1.2 ideally  
suitedforsingleLi-Ionbattery-poweredapplications.100%  
duty cycle provides low dropout operation, extending  
battery life in portable systems. PWM pulse skipping  
modeoperationprovidesverylowoutputripplevoltagefor  
noise sensitive applications.  
■
High Efficiency: Up to 90%  
■
Very Low Quiescent Current: Only 20µA  
■
600mA Output Current at VIN = 3V  
■
2.5V to 5.5V Input Voltage Range  
■
1.5MHz Constant Frequency Operation  
■
No Schottky Diode Required  
■
Shutdown Mode Draws <1µA Supply Current  
■
Current Mode Operation for Excellent Line and  
Load Transient Response  
■
Overtemperature Protected  
Low Profile (1mm) ThinSOTTM Package  
■
Switching frequency is internally set at 1.5MHz, allowing  
the use of small surface mount inductors and capacitors.  
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. The  
LTC3406-1.2 is available in a low profile (1mm) ThinSOT  
package.  
U
APPLICATIO S  
■
Cellular Telephones  
■
Personal Information Appliances  
■
Wireless and DSL Modems  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. ThinSOT is a trademark of Linear  
Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066,  
6127815, 6498466, 6611131.  
■
Digital Still Cameras  
■
MP3 Players  
■
Portable Instruments  
U
TYPICAL APPLICATIO  
Efficiency and Power Loss  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
High Efficiency Step-Down Converter  
EFFICIENCY  
2.2µH  
0.1  
V
V
IN  
OUT  
V
SW  
LTC3406-1.2  
RUN  
IN  
2.7V TO 5.5V  
C
1.2V  
C
OUT  
IN  
10µF 600mA  
4.7µF  
CER  
0.01  
CER  
V
OUT  
340612 TA01a  
POWER LOSS  
0.001  
0.0001  
0.00001  
GND  
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
IN  
IN  
IN  
0.1  
1000  
1
10  
100  
LOAD CURRENT (mA)  
340612 TA01b  
340612f  
1
1234567...12

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