AAT3141 datasheet(15/16 Pages) AAT

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AAT3141

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

for White LED Applications

3141.2007.03.1.3

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 have tight tolerance and are stable over

temperature. Large capacitor values are composed

of X7R, X5R, Z5U, or Y5V dielectric materials.

Large ceramic capacitors, typically greater than

2.2µF, are often available in low-cost Y5V and Z5U

dielectrics, but capacitors greater than 1µF are usu-

ally not required for AAT3141 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 AAT3141 has a thermal protection circuit that

will shut down the charge pump if the die tempera-

ture rises above the thermal limit, as is the case

during a short-circuit of the CP pin.

Charge Pump Compatibility

The four-output AAT3141 is pin-compatible with the

AAT3123, AAT3132, and AAT3113 in TSOPJW-12

packages. The AAT3141 offers an improved overall

efficiency, wider operating range, and the ability to

drive high-V

type LEDs at full current. The

AAT3141 is well suited for battery-powered appli-

cations using single-cell lithium-ion/polymer batter-

ies and 3-series connected dry cells (3.6V).

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