AAT3153 查看數據表（PDF） - Analog Technology Inc

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AAT3153

High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

Analog Technology Inc 

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Capacitor Characteristics

Ceramic composition capacitors are highly recom-

mended over all other types of capacitors for use

with the AAT3153. Ceramic capacitors offer many

advantages over their tantalum and aluminum elec-

trolytic counterparts. A ceramic capacitor typically

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 con-

nection damage.

Equivalent Series Resistance

ESR is an important characteristic to consider

when selecting a capacitor. ESR is a resistance

internal to a capacitor which 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 COG materials. NPO and COG

materials typically have tight tolerance and are sta-

ble over temperature. Larger capacitor values are

typically composed of X7R, X5R, Z5U, or Y5V

dielectric materials. Large ceramic capacitors, typ-

ically greater than 2.2µF, are often available in low-

cost Y5V and Z5U dielectrics, but capacitors

greater than 1µF are typically not 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.

Thermal Protection

The AAT3153 has a built-in thermal protection cir-

cuit that will shut down the charge pump if the die

temperature rises above the thermal limit, as is the

case during a short circuit of the VOUT pin.

3153.2004.10.0.6

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