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LTC3561A

更新时间： 2024-11-11 05:43:55
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
20页 294K
描述
1A, 4MHz, Synchronous Step-Down DC/DC Converter

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中文翻译

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LTC3561A 数据手册

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LTC3561A  
1A, 4MHz, Synchronous  
Step-Down DC/DC Converter  
FEATURES  
DESCRIPTION  
The LTC®3561A is a constant frequency, synchronous  
step-down DC/DC converter. Intended for medium power  
applications, it operates from a 2.5V to 5.5V input voltage  
range and has a user configurable operating frequency up  
to 4MHz, allowing the use of tiny, low cost capacitors and  
inductors 1mm or less in height. The output voltage is  
adjustable from 0.8V to 5.5V. Internal synchronous power  
switches provide high efficiency. The LTC3561A’s current  
mode architecture and external compensation allow the  
transient response to be optimized over a wide range of  
loads and output capacitors.  
■
Uses Tiny Capacitors and Inductor  
■
High Frequency Operation: Up to 4MHz  
■
Low R  
Internal Switches: 0.15Ω  
DS(ON)  
■
■
■
High Efficiency: Up to 96%  
Stable with Ceramic Capacitors  
Current Mode Operation for Excellent Line  
and Load Transient Response  
Short-Circuit Protected  
Low Dropout Operation: 100% Duty Cycle  
■
■
■
■
■
■
■
Low Shutdown Current: I ≤ 1μA  
Q
Low Quiescent Current: 330μA  
Output Voltages from 0.8V to 5V  
To further maximize battery life, the P-channel MOSFET  
is turned on continuously in dropout (100% duty cycle).  
In shutdown, the device draws <1μA.  
V : 2.5V to 5.5V  
IN  
Small 8-Lead 3mm × 3mm DFN Package  
, LT, LTC and LTM are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 5481178, 6580258, 6498466, 6611131.  
APPLICATIONS  
■
Notebook Computers  
■
Digital Cameras  
■
Cellular Phones  
Handheld Instruments  
■
■
Board Mounted Power Supplies  
TYPICAL APPLICATION  
Efficiency and Power Loss vs Output Current  
Step-Down 2.5V/1A Regulator  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
V
IN  
2.5V TO 5.5V  
10μF  
0.1  
PV  
SV  
IN  
IN  
SW  
2.2μH  
22pF  
V
2.5V  
1A  
OUT  
0.01  
LTC3561A  
22μF  
I
V
O
= 2.5V  
TH  
OUT  
249k  
118k  
f
= 1MHz  
0.001  
SHDN/R  
V
FB  
T
16.9k  
680pF  
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
IN  
IN  
IN  
SGND  
PGND  
549k  
0.0001  
10000  
1
10  
100  
1000  
3561a TA01a  
OUTPUT CURRENT (mA)  
3561A TA01b  
3561af  
1
1234567...20

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