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LTC3525D-3.3 PDF预览

LTC3525D-3.3

更新时间： 2024-11-12 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
12页 217K
描述
400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode

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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  
U
DESCRIPTIO  
FEATURES  
TheLTC®3525D-3.3isahighefficiencysynchronousstep-  
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  
required. The LTC3525D features a fixed output voltage  
■
V
Connected to V in Shutdown  
OUT  
IN  
■
■
■
■
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  
of 3.3V. In shutdown, V  
is connected to V through  
■
■
■
■
■
■
■
■
Q
OUT IN  
V Range: 0.5V to 4.5V  
the inductor.  
IN  
Only Three External Components  
The device includes a 0.5Ω N-channel MOSFET switch  
and a 0.8Ω P-channel synchronous rectifier. Peak switch  
current ranges from 150mA to 400mA, depending on  
load, providing enhanced efficiency. Quiescent current  
is an ultralow 7µA, maximizing battery life in portable  
applications.  
V > V  
Operation  
IN  
OUT  
Antiringing Control  
Short-Circuit and Overtemperature Protection  
Very Low Profile of 1mm  
Tiny 6-Pin SC70UPackage  
APPLICATIO S  
Other features include anti-ringing control and thermal  
shutdown. The LTC3525D is available in a tiny 6-pin SC70  
package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Patents Pending.  
■
MP3 Players  
■
Portable Instruments  
■
Glucose Meters  
■
Digital Cameras  
U
TYPICAL APPLICATIO  
LTC3525D-3.3 Efficiency and  
Power Loss vs Load Current  
L1*  
10µH  
100  
90  
80  
70  
60  
50  
40  
30  
20  
100  
10  
LTC3525D-3.3  
EFFICIENCY  
V
V
SW  
OUT  
IN  
1.8V to 3.2V  
IN  
V
OUT  
3.3V  
SHDN  
GND  
V
PASS THROUGH ON  
1
140mA  
POWER LOSS  
GND  
1µF  
10µF  
0.1  
V
V
V
= 3V  
= 2.4V  
= 1.2V  
IN  
IN  
IN  
3525 TA01  
0.01  
1000  
0.01  
0.1  
1
10  
100  
*MURATA LQH32CN100K53  
LOAD (mA)  
LT3525 • TA02  
3525d33f  
1
1234567...12

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