AAT3129 datasheet(13/15 Pages) AAT

13 / 15 page

AAT3129

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

for RGB Color LED Applications

3129.2007.01.1.4

Ceramic Capacitor Materials

Ceramic capacitors less than 0.1μF are typically

made from NPO or C0G materials. NPO and C0G

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, typi-

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

cost Y5V and Z5U dielectrics, but capacitors

greater than 1μF are typically not required for

AAT3129 applications.

Capacitor area is another contributor to ESR.

Capacitors that are physically large will have a

lower ESR when compared to a smaller capacitor

made from an equivalent material. These larger

devices can improve circuit transient response

when compared to an equal value capacitor in a

smaller package size.

Layout Considerations

The AAT3129 is a high-performance device that

operates with a high switching frequency. To ensure

optimal device performance and accommodate the

fast transients generated by the AAT3129 special

attention should be given to the board layout.

The recommended layout is illustrated in Figure 1.

The traces connecting C1 and C2 experience fast

current transients. As a result, the trace lengths for

C1 and C2 should be minimized by placing the

components as closely as possible to the IC. This

will minimize path resistance and reduce ringing

due to the inductance associated with trace length.

For best IC performance, CIN and COUT are placed

as closely as possible to the IN and CP pins and

are connected to a solid ground.

Figure 1: Optimal PCB Layout.

GND

CIN

COUT

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