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AAT3153 Datasheet(PDF) 12 Page - Advanced Analog Technology, Inc.

Part No. AAT3153
Description  High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
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Manufacturer  AAT [Advanced Analog Technology, Inc.]
Direct Link  http://www.aatech.com.tw
Logo AAT - Advanced Analog Technology, Inc.

AAT3153 Datasheet(HTML) 12 Page - Advanced Analog Technology, Inc.

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trolytic counterparts. A ceramic capacitor has very
low ESR, is lowest cost, has a smaller PCB foot-
print, and is non-polarized. Low ESR ceramic
capacitors help to maximize charge pump transient
response. Since ceramic capacitors are non-polar-
ized, they are not prone to incorrect connection
damage.
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 connections, size or area, material compo-
sition, and ambient temperature. Capacitor ESR is
typically measured in milliohms for ceramic capac-
itors and can range to more than several ohms for
tantalum or aluminum electrolytic capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1µF are typically
made from NPO or C0G materials. NPO and C0G
materials generally have tight tolerance and are
very stable over temperature. Larger capacitor val-
ues are usually composed of X7R, X5R, Z5U, or
Y5V dielectric materials. Large ceramic capacitors
(i.e., greater than 2.2µF) are often available in low-
cost Y5V and Z5U dielectrics, but capacitors
greater than 1µF are not typically required for
AAT3153 applications.
Capacitor area is another contributor to ESR.
Capacitors that are physically large will have a lower
ESR when compared to an equivalent material
smaller capacitor. These larger devices can improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
AAT3153
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
12
3153.2005.12.0.93


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