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LTC1911-1.5

更新时间： 2024-09-24 05:43:43
品牌 Logo 应用领域
凌特 - Linear 转换器电感器
页数 文件大小 规格书
12页 205K
描述
Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter

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LTC1911-1.5 数据手册

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LTC1911-1.5/LTC1911-1.8  
Low Noise, High Efficiency,  
Inductorless Step-Down  
DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
■
Low Noise Constant Frequency Operation  
The LTC®1911 is a switched capacitor step-down DC/DC  
converter that produces a 1.5V or 1.8V regulated output  
from a 2.7V to 5.5V input. The part uses switched capaci-  
torfractionalconversiontoachievehighefficiencyoverthe  
entire input range. No inductors are required. Internal cir-  
cuitry controls the step-down conversion ratio to optimize  
efficiency as the input voltage and load conditions vary.*  
Typical efficiency is over 25% higher than that of a linear  
regulator.  
■
2.7V to 5.5V Input Voltage Range  
■
No Inductors  
■
Typical Efficiency 25% Higher Than LDOs  
■
Shutdown Disconnects Load from VIN  
■
Output Voltage: 1.8V ±4% or 1.5V ±4%  
■
Output Current: 250mA  
■
Low Operating Current: IIN = 180µA Typ  
■
Low Shutdown Current: IIN = 10µA Typ  
■
Oscillator Frequency: 1.5MHz  
A unique constant frequency architecture provides a low  
noise regulated output as well as lower input noise than  
conventional charge pump regulators. High frequency  
operation (fOSC = 1.5MHz) simplifies output filtering to  
further reduce conducted noise. To optimize efficiency,  
the part enters Burst Mode® operation under light load  
conditions.  
■
Soft-Start Limits Inrush Current at Turn On  
■
Short-Circuit and Overtemperature Protected  
■
Available in an 8-Pin MSOP Package  
U
APPLICATIO S  
■
Handheld Computers  
■
Cellular Phones  
Low operating current (180µA with no load, 10µA in  
shutdown) and low external parts count (two 1µF flying  
capacitors and two 10µF bypass capacitors) make the  
LTC1911 ideally suited for space constrained battery-  
powered applications. The part is short-circuit and  
overtemperature protected, and is available in an 8-pin  
MSOP package.  
■
Smart Card Readers  
■
Portable Electronic Equipment  
■
Handheld Medical Instruments  
■
Low Power DSP Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
*U.S. Patent #6,438,005  
U
TYPICAL APPLICATIO  
Efficiency  
90  
Single Cell Li-Ion to 1.8V DC/DC Converter  
80  
100mA  
250mA  
70  
60  
LTC1911-1.8  
2.7V TO 5.5V INPUT  
1
2
3
4
8
6
7
5
V
SS/SHDN  
IN  
1-CELL Li-Ion  
OR  
V
I
= 1.8V  
OUT  
OUT  
+
10µF*  
1µF*  
C2  
C2  
V
OUT  
= 250mA  
3-CELL NiMH  
50  
40  
30  
+
10µF*  
–
C1  
IDEAL LDO  
1µF*  
–
GND  
C1  
1911 TA01  
*CERAMIC CAPACITOR  
V
OUT  
= 1.8V  
2
3
4
5
6
INPUT VOLTAGE (V)  
1911 G05  
1911f  
1
1234567...12

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