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LTC1767

更新时间： 2024-11-19 12:09:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 229K
描述
1.5MHz, 600mA Synchronous Step-Down egulator in ThinSOT

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LTC1767 数据手册

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LTC3406  
LTC3406-1.5/LTC3406-1.8  
1.5MHz, 600mA  
Synchronous Step-Down  
Regulator in ThinSOT  
U
FEATURES  
DESCRIPTIO  
The LTC®3406 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. The device is available in an adjustable  
versionandfixedoutputvoltagesof1.5Vand1.8V. Supply  
current during operation is only 20µA and drops to ≤1µA  
in shutdown. The 2.5V to 5.5V input voltage range makes  
the LTC3406 ideally suited for single Li-Ion battery-pow-  
ered applications. 100% duty cycle provides low dropout  
operation, extending battery life in portable systems.  
Automatic Burst Mode® operation increases efficiency at  
light loads, further extending battery life.  
■
High Efficiency: Up to 96%  
■
Very Low Quiescent Current: Only 20µA  
During Operation  
600mA Output Current  
2.5V to 5.5V Input Voltage Range  
1.5MHz Constant Frequency Operation  
No Schottky Diode Required  
■
■
■
■
■
■
■
■
Low Dropout Operation: 100% Duty Cycle  
0.6V Reference Allows Low Output Voltages  
Shutdown Mode Draws ≤1µA Supply Current  
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.  
■
■
Overtemperature Protected  
Low Profile (1mm) ThinSOTTM Package  
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with the 0.6V feed-  
back reference voltage. The LTC3406 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.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
■
Digital Still Cameras  
Protected by U.S. Patents, including 6580258, 5481178.  
■
MP3 Players  
■
Portable Instruments  
U
TYPICAL APPLICATIO  
95  
V
= 2.7V  
IN  
90  
85  
80  
75  
70  
65  
60  
2.2µH*  
V
V
IN  
OUT  
4
1
3
5
V
= 3.6V  
IN  
2.7V  
1.8V  
V
SW  
IN  
†
C
C
**  
TO 5.5V  
OUT  
600mA  
IN  
10µF  
V
= 4.2V  
4.7µF  
IN  
LTC3406-1.8  
CER  
CER  
3406 F01a  
RUN  
V
OUT  
GND  
2
V
= 1.8V  
OUT  
*MURATA LQH32CN2R2M33  
0.1  
1
10  
100  
1000  
**TAIYO YUDEN JMK212BJ475MG  
†TAIYO YUDEN JMK316BJ106ML  
OUTPUT CURRENT (mA)  
3406 F01b  
Figure 1a. High Efficiency Step-Down Converter  
Figure 1b. Efficiency vs Load Current  
3406fa  
1
1234567...16

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