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AAT3351IWP-T1

更新时间： 2024-01-24 06:29:29
品牌 Logo 应用领域
ANALOGICTECH /
页数 文件大小 规格书
17页 2077K
描述
Interface Circuit

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AAT3351IWP-T1 技术参数

是否Rohs认证： 符合生命周期：Obsolete
包装说明：,Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.82模拟集成电路 - 其他类型：SWITCHED CAPACITOR REGULATOR
峰值回流温度（摄氏度）：NOT SPECIFIED处于峰值回流温度下的最长时间：NOT SPECIFIED
Base Number Matches：1

AAT3351IWP-T1 数据手册

 浏览型号AAT3351IWP-T1的Datasheet PDF文件第8页浏览型号AAT3351IWP-T1的Datasheet PDF文件第9页浏览型号AAT3351IWP-T1的Datasheet PDF文件第10页浏览型号AAT3351IWP-T1的Datasheet PDF文件第12页浏览型号AAT3351IWP-T1的Datasheet PDF文件第13页浏览型号AAT3351IWP-T1的Datasheet PDF文件第14页 
PRODUCT DATASHEET  
AAT3351  
TM  
ChargePump  
High Efficiency 1x/1.5x Charge Pump  
Capacitor Selection  
Ceramic Capacitor Materials  
Careful selection of the four external capacitors CIN, C1,  
C2, and COUT is important because they will affect turn-on  
time, output ripple, and transient load performance.  
Optimum performance will be obtained when low equiva-  
lent series resistance (ESR) ceramic capacitors are used.  
In general, low ESR may be defined as less than 100mΩ.  
A value of 1ꢀF for all four capacitors is a good starting  
point when choosing capacitors. If the LED current sinks  
are only programmed for low current levels, then the  
capacitor size may be decreased.  
Ceramic capacitors less than 0.1ꢀF are typically made  
from NPO or C0G materials. NPO and C0G materials  
have tight tolerance and are stable over temperature.  
Capacitors with large values are typically composed of  
X7R, X5R, Z5U, or Y5V dielectric materials.  
Large ceramic capacitors, greater than 2.2ꢀF, are often  
available in low-cost Y5V and Z5U dielectrics, but capac-  
itors greater than 1ꢀF are usually not required for  
AAT3351 applications.  
Capacitor area is another contributor to ESR. Capacitors  
that are physically larger will have lower ESR when com-  
pared to equivalent material but smaller capacitors.  
These larger devices can improve circuit transient  
response when compared to an equal value capacitor in  
a smaller size.  
Capacitor Characteristics  
Ceramic composition capacitors are highly recommended  
over all other types of capacitors for use with the  
AAT3351. Ceramic capacitors offer many advantages  
over their tantalum and aluminum electrolytic counter-  
parts. A ceramic capacitor has very low ESR, is lowest  
cost, has a smaller PCB footprint, and is non-polarized.  
Low ESR ceramic capacitors help to maximize charge  
pump transient response. Since ceramic capacitors are  
non-polarized, they are not prone to incorrect connec-  
tion damage.  
Evaluation Board Layout  
When designing a PCB for the AAT3351, the key require-  
ments are:  
1. Place two flying capacitors C1 and C2 as close to the  
chip as possible; otherwise 1.5x mode performance  
will be compromised.  
2. Place input and output decoupling caps as close to  
the chip as possible to reduce switching noise and  
output ripple.  
Equivalent Series Resistance  
ESR is an important characteristic to consider when  
selecting a capacitor. ESR is a resistance internal to a  
capacitor that is caused by the leads, internal connec-  
tions, size or area, material composition, and ambient  
temperature. Capacitor ESR is typically measured in mil-  
liohms for ceramic capacitors and can range to more  
than several ohms for tantalum or aluminum electrolytic  
capacitors.  
Temperature  
Coefficient  
Manufacturer  
Part Number  
Value (μF)  
Voltage (V)  
Case  
GRM219R71C104KA01  
GRM188R61A105KA61  
GRM219R61A475KE19  
0603ZD105K  
C1608X5R1E105K  
C1608X5R1A475K  
LMK107BJ475KA  
0.1  
1
4.7  
1
1
4.7  
4.7  
10  
10  
10  
10  
25  
10  
10  
X7R  
X5R  
X5R  
X5R  
X5R  
X5R  
X5R  
0805  
0603  
0805  
0603  
0603  
0603  
0603  
Murata  
AVX  
TDK  
Taiyo Yuden  
Table 2: Surface Mount Capacitors.  
w w w . a n a l o g i c t e c h . c o m  
3351.2009.06.1.1  
11  
1...891011121314...17

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