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LTC3406B-2

更新时间： 2024-01-19 22:07:05
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 213K
描述
2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

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中文翻译

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LTC3406B-2 数据手册

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LTC3406B-2  
2.25MHz, 600mA  
Synchronous Step-Down  
Regulator in ThinSOTTM  
U
FEATURES  
DESCRIPTIO  
TheLTC®3406B-2isahighefficiencymonolithicsynchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Supply current with no load is 350µA,  
dropping to <1µA in shutdown. The 2.5V to 5.5V input  
voltage range makes the LTC3406B-2 ideally suited for  
single Li-Ion battery-powered applications. 100% duty  
cycle capability provides low dropout operation, extend-  
ing battery life in portable systems. PWM pulse skipping  
modeoperationprovidesverylowoutputripplevoltagefor  
noise sensitive applications.  
■
High Efficiency: Up to 96%  
■
600mA Output Current at VIN = 3V  
■
2.5V to 5.5V Input Voltage Range  
■
2.25MHz Constant Frequency Operation  
■
No Schottky Diode Required  
■
Low Dropout Operation: 100% Duty Cycle  
■
Low Quiescent Current: 350µA  
■
0.6V Reference Allows Low Output Voltages  
■
Shutdown Mode Draws <1µA Supply Current  
■
Current Mode Operation for Excellent Line and  
Load Transient Response  
Theswitchingfrequencyisinternallysetat2.25MHz,allow-  
ingtheuseoftinysurfacemountinductorsandcapacitors.  
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
outputvoltagesareeasilysupportedwiththe0.6Vfeedback  
referencevoltage.TheLTC3406B-2isavailableinalowpro-  
file (1mm) SOT-23 package. Refer to LTC3406 for appli-  
cations that require Burst Mode® operation.  
■
Overtemperature Protected  
■
Low Profile (1mm) SOT-23 Package  
U
APPLICATIO S  
■
Cellular Telephones  
■
Personal Information Appliances  
■
Wireless and DSL Modems  
■
Digital Still Cameras  
, 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.  
■
MP3 Players  
■
Portable Instruments  
Protected by U.S. Patents, including 6580258, 5481178.  
U
TYPICAL APPLICATIO  
High Efficiency Step-Down Converter  
Efficiency vs Load Current  
100  
V
T
= 1.8V  
OUT  
A
2.2µH*  
V
V
OUT  
IN  
= 25°C  
90  
80  
70  
60  
50  
40  
30  
20  
10  
1.8V  
2.7V  
V
SW  
LTC3406B-2  
RUN  
IN  
600mA  
TO 5.5V  
10µF  
CER  
4.7µF  
CER  
22pF  
1M  
V
= 3.6V  
IN  
V
FB  
V
= 2.7V  
IN  
GND  
499k  
3406B TA01a  
V
= 4.2V  
1
IN  
0.1  
1000  
10  
100  
OUTPUT CURRENT (mA)  
3406B TA01b  
sn3406b2 3406b2fs  
1
1234567...16

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