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LT1617-1

更新时间： 2024-11-05 22:19:23
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
8页 146K
描述
Micropower Inverting DC/DC Converters in SOT-23

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中文翻译

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LT1617-1 数据手册

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LT1617/LT1617-1  
Micropower Inverting  
DC/DC Converters  
in SOT-23  
U
FEATURES  
DESCRIPTIO  
The LT®1617/LT1617-1 are micropower inverting DC/DC  
converters in a 5-lead SOT-23 package. The LT1617 is  
designed for higher power systems with a 350mA current  
limit and an input voltage range of 1.2V to 15V, whereas  
the LT1617-1 is intended for lower power and single-cell  
applications with a 100mA current limit and an extended  
input voltage range of 1V to 15V. Otherwise, the two  
devices are functionally equivalent. Both devices feature a  
quiescent current of only 20µA at no load, which further  
reduces to 0.5µA in shutdown. A current limited, fixed off-  
time control scheme conserves operating current, result-  
ing in high efficiency over a broad range of load current.  
The 36V switch allows high voltage outputs up to –34V to  
beeasilygeneratedwithouttheuseofcostlytransformers.  
The LT1617’s low off-time of 400ns permits the use of  
tiny, low profile inductors and capacitors to minimize  
footprint and cost in space-conscious portable applications.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Low Quiescent Current:  
20  
µ
A in Active Mode  
<1µA in Shutdown Mode  
■
■
■
■
■
Operates with VIN as Low as 1V  
Low VCESAT Switch: 250mV at 300mA  
Uses Small Surface Mount Components  
High Output Voltage: Up to –34V  
Tiny 5-Lead SOT-23 Package  
U
APPLICATIO S  
■
LCD Bias  
■
Handheld Computers  
■
Battery Backup  
Digital Cameras  
■
U
TYPICAL APPLICATION  
1-Cell Li-Ion to –15V Inverting Converter  
Efficiency  
80  
C3  
L1  
L2  
0.22µF  
22µH  
22µH  
V
–15V  
IN  
2.5V TO 4.2V  
V
= 4.2V  
V
75  
70  
65  
60  
55  
50  
IN  
12mA  
5
1
V
SW  
IN  
= 2.5V  
D1  
267k  
IN  
C2  
4.7µF  
LT1617  
4
3
SHDN  
NFB  
GND  
2
C1  
4.7µF  
24.9k  
C1: TAIYO YUDEN LMK316BJ475  
C2: TAIYO YUDEN EMK316BJ475  
C3: TAIYO YUDEN TMK316BJ224  
L1, L2: MURATA LQH3C220K34  
D1: MOTOROLA MBR0530  
1617/-1 TA01  
0.1  
1
10  
30  
LOAD CURRENT (mA)  
1617/-1 TA01a  
1
12345678

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