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LTC3525D-3.3 PDF预览

LTC3525D-3.3

更新时间： 2024-11-13 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
14页 486K
描述
具穿透模式的 400mA 微功率同步升压型 DC/DC 转换器

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LTC3525D-3.3 数据手册

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LTC3525D-3.3  
400mA Micropower  
Synchronous Step-Up DC/DC  
Converter with Pass Through Mode  
FeaTures  
DescripTion  
The LTC®3525D-3.3 is a high efficiency synchronous step-  
up DC/DC converter that can start up with an input as low  
as 0.85V. It offers a compact, high efficiency alternative to  
charge pumps in single cell or dual cell alkaline or Li-Ion  
applications. Only three small external components are re-  
quired.TheLTC3525Dfeaturesafixedoutputvoltageof3.3V.  
In shutdown, V is connected to V through the inductor.  
n
V
Connected to V in Shutdown  
OUT  
IN  
n
n
n
n
Up to 95% Efficiency  
0.85V Minimum Input Start-Up Voltage  
Fixed Output Voltage of 3.3V  
Delivers 60mA at 3.3V from a 1V Input,  
or 140mA at 3.3V from a 1.8V Input  
Burst Mode® Operation: I = 7µA  
n
n
n
n
n
n
n
n
Q
OUT  
IN  
V Range: 0.5V to 4.5V  
Only Three External Components  
V > V  
Anti-Ringing Control  
Short-Circuit and Overtemperature Protection  
Very Low Profile of 1mm  
Tiny 6-Lead SC70 Package  
IN  
The device includes a 0.5Ω N-channel MOSFET switch and  
a0.8Ω P-channelsynchronousrectifier.Peakswitchcurrent  
rangesfrom150mAto400mA,dependingonload,providing  
enhanced efficiency. Quiescent current is an ultralow 7µA,  
maximizing battery life in portable applications.  
Operation  
IN  
OUT  
Other features include anti-ringing control and thermal  
shutdown. The LTC3525D is available in a tiny 6-Lead  
SC70 package.  
applicaTions  
n
List of LTC3525 Options  
MP3 Players  
n
Portable Instruments  
INPUT START-UP  
VOLTAGE  
OUTPUT  
VOLTAGE SHUTDOWN MODE  
V
STATUS IN  
OUT  
PART NAME  
n
Glucose Meters  
Digital Cameras  
n
LTC3525-3  
0.85V  
0.85V  
0.85V  
0.85V  
0.7V  
3V  
3.3V  
5V  
Output Disconnect  
Output Disconnect  
Output Disconnect  
Pass Through Mode  
Output Disconnect  
LTC3525-3.3  
LTC3525-5  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Patents pending.  
LTC3525D-3.3  
LTC3525L-3  
3.3V  
3V  
LTC3525D-3.3 Efficiency and  
Power Loss vs Load Current  
Typical applicaTion  
L1*  
100  
90  
80  
70  
60  
50  
40  
30  
20  
100  
10  
10µH  
LTC3525D-3.3  
EFFICIENCY  
V
IN  
V
SW  
OUT  
IN  
1.8V TO 3.2V  
V
OUT  
3.3V  
140mA  
SHDN  
V
1
PASS THROUGH ON  
1µF  
POWER LOSS  
GND  
GND  
10µF  
0.1  
V
V
V
= 3V  
= 2.4V  
= 1.2V  
IN  
IN  
IN  
3525 TA01  
*MURATA LQH32CN100K53  
0.01  
1000  
0.01  
0.1  
1
10  
100  
LOAD (mA)  
LT3525 • TA02  
3525d33fb  
1
For more information www.linear.com/LTC3525D3.3  
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