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LTFX

更新时间： 2024-01-12 10:56:08
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
12页 192K
描述
High Efficiency Inductorless Step-Down DC/DC Converters

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中文翻译

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LTFX 数据手册

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LTC1503-1.8/LTC1503-2  
High Efficiency Inductorless  
Step-Down DC/DC Converters  
U
FEATURES  
DESCRIPTIO  
The LTC®1503-1.8/LTC1503-2 are switched capacitor  
step-down DC/DC converters that produce a regulated  
output from a 2.4V to 6V input. The parts use switched  
capacitor fractional conversion to achieve high efficiency  
over the entire input range. No inductors are required.  
Internal circuitry controls the step-down conversion ratio  
to optimize efficiency as the input voltage and load condi-  
tions vary. Typical efficiency is 25% higher than that of a  
low dropout (LDO) linear regulator.  
■
Input Voltage Range: 2.4V to 6V  
■
Fixed Output Voltages: 1.8V ±4%, 2V ±4%  
■
Output Current: Up to 100mA  
No Inductors  
■
■
Typical Efficiency 25% Higher than LDOs  
■
Low Operating Current: 25µA  
■
■
■
■
■
■
Low Shutdown Current: 5µA  
600kHz Switching Frequency  
Shutdown Disconnects Load from VIN  
Soft-Start Limits Inrush Current at Turn-On  
Short-Circuit and Overtemperature Protected  
Available in 8-Pin MSOP and SO Packages  
Regulation is achieved by sensing the output voltage and  
enabling the internal switching network as needed to  
maintain a fixed output voltage. This method of regulation  
enables the parts to achieve high efficiency at extremely  
lightloads. Lowoperatingcurrent(25µAwithnoload, 5µA  
in shutdown) and low external parts count (two 1µF flying  
capacitors and two 10µF bypass capacitors) make the  
LTC1503-1.8/LTC1503-2 ideally suited for space con-  
strained battery-powered applications. The parts are fully  
short-circuit and overtemperature protected.  
U
APPLICATIO S  
■
Cellular Phones  
■
Handheld Computers  
■
Smart Card Readers  
Low Power DSP Supplies  
Portable Electronic Equipment  
Handheld Medical Instruments  
■
■
The LTC1503-1.8/LTC1503-2 are available in 8-pin MSOP  
and SO packages.  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Efficiency vs Input Voltage  
100  
I
= 100mA  
OUT  
Single Li-Ion to 2V DC/DC Converter  
80  
60  
40  
20  
LTC1503-2  
4
2
3
5
1
8
6
7
V
= 2V  
OUT  
OUT  
I
= 1mA  
V
V
OUT  
IN  
OUT  
–
I
= 100mA  
1-CELL Li-Ion OR  
3-CELL NiMH  
10µF  
10µF  
–
C1  
C1  
C2  
C2  
1µF  
1µF  
+
+
“IDEAL” LDO  
SHDN/SS GND  
1503-1.8/2 TA01  
LTC1503-2  
= 2V  
V
OUT  
4
5
2
6
3
INPUT VOLTAGE (V)  
1503-1.8/2 TA02  
1
1234567...12

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