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LTC3405A-1.375

更新时间： 2022-12-28 23:46:33
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
12页 257K
描述
1.375V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT

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LTC3405A-1.375 数据手册

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LTC3405A-1.375  
1.375V, 1.5MHz, 300mA  
Synchronous Step-Down  
Regulators in ThinSOT  
U
FEATURES  
DESCRIPTIO  
The LTC®3405A-1.375 is a high efficiency monolithic  
synchronous buck regulator using a constant frequency,  
current mode architecture. Supply current during opera-  
tionisonly20µAanddropsto<1µAinshutdown.The2.5V  
to 5.5V input voltage range makes the LTC3405A-1.375  
ideally suited for single Li-Ion battery-powered applica-  
tions. 100% duty cycle provides low dropout operation,  
extending battery life in portable systems.  
■
High Efficiency: Up to 90%  
■
Very Low Quiescent Current: Only 20µA  
During Operation  
■
300mA Output Current at VIN = 3V  
■
2.5V to 5.5V Input Voltage Range  
■
1.5MHz Constant Frequency Operation  
No Schottky Diode Required  
■
■
■
■
■
■
Low Dropout Operation: 100% Duty Cycle  
Stable with Ceramic Capacitors  
Shutdown Mode Draws <1µA Supply Current  
±3% Output Voltage Accuracy  
Current Mode Operation for Excellent Line and  
Load Transient Response  
Switching frequency is internally set at 1.5MHz, allowing  
the use of small surface mount inductors and capacitors.  
The LTC3405A-1.375 is specifically designed to work well  
with ceramic output capacitors, achieving very low output  
voltage ripple and a small PCB footprint.  
■
■
Overtemperature Protected  
Low Profile (1mm) ThinSOTTM Package  
U
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. The  
LTC3405A-1.375 is available in a low profile (1mm)  
ThinSOT package.  
APPLICATIO S  
■
Cellular Telephones  
■
Personal Information Appliances  
For other output voltages, refer to the LTC3405A and  
LTC3405A-1.5/LTC3405A-1.8 data sheets.  
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode  
is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of  
Linear Technology Corporation. All other trademarks are the property of their respective  
owners. Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815,  
6498466, 6611131.  
■
Wireless and DSL Modems  
■
Digital Still Cameras  
■
MP3 Players  
■
Portable Instruments  
U
TYPICAL APPLICATIO  
100  
90  
80  
70  
60  
50  
4.7µH  
V
V
OUT  
IN  
1.375V  
300mA  
2.7V  
V
SW  
IN  
C
TO 5.5V  
IN  
LTC3405A-1.375  
RUN  
C
4.7µF  
OUT  
4.7µF  
CER  
CER  
MODE  
GND  
V
OUT  
3405A1375 F01  
V
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
= 5.5V  
IN  
IN  
IN  
IN  
40  
30  
0.1  
1
10  
100  
1000  
OUTPUT CURRENT (mA)  
3405A1375 F01b  
Figure 1a. High Efficiency Step-Down Converter  
Figure 1b. Efficiency vs Load Current  
3405a1375f  
1
1234567...12

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