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LT1944-1

更新时间： 2024-11-30 22:25:27
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
8页 155K
描述
Dual Micropower Step-Up DC/DC Converter

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中文翻译

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LT1944-1 数据手册

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LT1944-1  
Dual Micropower Step-Up  
DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
The LT®1944-1 is a dual micropower step-up DC/DC  
converter in a 10-pin MSOP package. One converter is  
designed with a 100mA current limit and a 400ns off-time;  
the other with a 175mA current limit and a 1.5µs off-time.  
The 1.5µs off-time converter is ideal for generating an  
output voltage that is close to the input voltage (i.e. a Li-  
Ion to 5V converter, or a two-cell to 3.3V converter). With  
aninputvoltagerangeof1.2Vto15V,theLT1944-1isideal  
for a wide variety of applications. Both converters 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.  
Tiny, low profile inductors and capacitors can be used to  
minimize footprint and cost in space-conscious portable  
applications.  
■
Low Quiescent Current:  
20  
µ
A in Active Mode  
<1µA in Shutdown Mode  
■
■
■
■
■
Operates with VIN as Low as 1.2V  
Low VCESAT Switches: 85mV at 70mA  
Uses Small Surface Mount Components  
High Output Voltage: Up to 34V  
Tiny 10-Pin MSOP Package  
U
APPLICATIO S  
■
Small TFT LCD Panels  
■
Handheld Computers  
■
Battery Backup  
Digital Cameras  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Triple Output Power Supply (5V, 15V, –10V) for LCD Displays  
L1  
5V Output Efficiency  
D1  
22µH  
V
IN  
5V  
40mA  
90  
2.7V  
TO 4.2V  
8
6
85  
80  
75  
70  
65  
60  
55  
50  
4.7pF  
1M  
V
SW2  
IN  
V
= 4.2V  
IN  
4
2
5
1
SHDN2  
FB2  
C1  
4.7µF  
C2  
4.7µF  
V
= 2.7V  
IN  
LT1944-1  
SHDN1  
FB1  
324k  
GND PGND PGND SW1  
10  
3
7
9
178k  
2M  
C3  
1µF  
0.1  
1
10  
100  
4.7pF  
D2  
L2  
22µH  
LOAD CURRENT (mA)  
1944-1 TA01a  
15V  
2.5mA  
D3  
C1, C2: TAIYO YUDEN JMK212BJ475  
C3, C4: TAIYO YUDEN EMK212BJ105  
C5: TAIYO YUDEN EMK107BJ104  
D1, D2, D3, D4: CENTRAL SEMI CMDSH3  
L1, L2: MURATA LQH3C220  
C4  
5V  
1µF  
C5  
0.1µF  
D4  
–10V  
1mA  
1944-1 TA01  
1
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