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LTC1144C PDF预览

LTC1144C

更新时间: 2024-09-29 22:34:15
品牌 Logo 应用领域
凌特 - Linear 转换器开关
页数 文件大小 规格书
8页 237K
描述
Switched-Capacitor Wide Input Range Voltage Converter with Shutdown

LTC1144C 数据手册

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LTC1144  
Switched-Capacitor  
Wide Input Range  
Voltage Converter  
with Shutdown  
U
DESCRIPTIO  
EATURE  
S
F
Wide Operating Supply Voltage Range: 2V to 18V  
Boost Pin (Pin 1) for Higher Switching Frequency  
Simple Conversion of 15V to –15V Supply  
Low Output Resistance: 120Maximum  
Power Shutdown to 8µA with SHDN Pin  
Open Circuit Voltage Conversion Efficiency:  
99.9% Typical  
The LTC1144 is a monolithic CMOS switched-capacitor  
voltage converter. It performs supply voltage conversion  
frompositivetonegativefromaninputrangeof2Vto18V,  
resulting in complementary output voltages of –2V to  
–18V. Only two noncritical external capacitors are needed  
for the charge pump and charge reservoir functions.  
The converter has an internal oscillator that can be  
overdriven by an external clock or slowed down when  
connected to a capacitor. The oscillator runs at a 10kHz  
frequency when unloaded. A higher frequency outside the  
audio band can also be obtained if the Boost Pin is tied to  
V+. The SHDN pin reduces supply current to 8µA and can  
be used to save power when the converter is not in use.  
Power Conversion Efficiency: 93% Typical  
Easy to Use  
O U  
PPLICATI  
S
A
Conversion of 15V to ±15V Supplies  
Inexpensive Negative Supplies  
Data Acquisition Systems  
The LTC1144 contains an internal oscillator, divide-by-  
two, voltage level shifter, and four power MOSFETs. A  
special logic circuit will prevent the power N-channel  
switch substrate from turning on.  
High Voltage Upgrade to LTC1044 or 7660  
Voltage Division and Multiplications  
Automotive Applications  
Battery Systems with Wall Adapter/Charger  
U
O
TYPICAL APPLICATI  
Generating –15V from 15V  
Output Voltage vs Load Current, V+ = 15V  
–15  
LTC1144  
R
T
= 56Ω  
OUT  
= 25°C  
1
2
3
4
8
7
6
5
+
15V INPUT  
BOOST  
V
A
–14  
–13  
–12  
–11  
–10  
+
CAP  
OSC  
+
10µF  
GND  
SHDN  
–15V OUTPUT  
CAP  
V
OUT  
10µF  
+
1144 TA01  
0
10  
20  
30  
40  
50  
LOAD CURRENT (mA)  
1144 TA02  
1

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