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LTC3560

更新时间： 2024-11-11 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
16页 324K
描述
2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT

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中文翻译

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LTC3560 数据手册

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LTC3560  
2.25MHz, 800mA  
Synchronous Step-Down  
Regulator in ThinSOT  
U
DESCRIPTIO  
FEATURES  
■
High Efficiency: Up to 95%  
The LTC®3560 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Supply current during operation is  
only 16µA, dropping to <1µA in shutdown. The 2.5V to  
5.5VinputvoltagerangemakestheLTC3560ideallysuited  
forsingleLi-Ion/Li-Polymerbattery-poweredapplications.  
100% duty cycle provides low dropout operation, extend-  
ing battery life in portable systems.  
Low Output Ripple (<20mVP-P): Burst Mode®  
■
Operation: IQ = 16µA  
■
■
■
■
■
■
■
■
■
■
2.5V to 5.5V Input Voltage Range  
2.25MHz Constant Frequency Operation  
Synchronizable to External Clock  
No Schottky Diode Required  
Stable with Ceramic Capacitors  
Low Dropout Operation: 100% Duty Cycle  
0.6V Reference Allows Low Output Voltages  
Shutdown Mode Draws <1µA Supply Current  
±2% Output Voltage Accuracy  
Switching frequency is internally set at 2.25MHz, allowing  
the use of small surface mount inductors and capacitors.  
For noise sensitive applications the LTC3560 can be  
externally synchronized from 1MHz to 3MHz. Burst Mode  
operation is inhibited during synchronization or when the  
SYNC/MODE pin is pulled high, preventing low frequency  
ripple from interfering with audio circuitry.  
Current Mode Operation for Excellent Line and  
Load Transient Response  
■
■
Overtemperature Protected  
Low Profile (1mm) ThinSOTTM Package  
U
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 LTC3560 is available in a low  
profile (1mm) ThinSOT package.  
, LTC, LT and Burst Mode are registered trademarks 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 6580258, 5481178, 5994885,  
6304066, 6498466, 6611131  
APPLICATIO S  
■
Cellular Telephones  
■
Wireless and DSL Modems  
■
Digital Still Cameras  
■
Media Players  
■
Portable Instruments  
U
TYPICAL APPLICATIO  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
0.1  
2.2µH  
V
IN  
V
OUT  
2.7V  
0.01  
0.001  
0.0001  
V
SW  
IN  
2.5V  
10pF  
C
TO 5.5V  
IN  
C
OUT  
LTC3560  
RUN  
10µF  
10µF  
CER  
CER  
SYNC/MODE V  
GND  
FB  
V
V
V
= 3.6V  
= 4.2V  
= 5.5V  
IN  
IN  
IN  
806k  
255k  
3405A F01a  
0.1  
1
10  
100  
1000  
LOAD CURRENT (mA)  
3560 F01b  
Figure 1a. High Efficiency Step-Down Converter  
Figure 1b. Efficiency vs Load Current  
3560f  
1
1234567...16

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