AAT3119_07 datasheet(15/18 Pages) ANALOGICTECH

Part #	AAT3119

Description	High Efficiency 2X Charge Pump

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Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

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15 / 18 page

AAT3119

High Efficiency 2X Charge Pump

3119.2007.02.1.2

15

Figure 3: Flash LED Driver with Gated Flash Application.

AAT3119

IN

GND

EN

OUT

4.5V

COUT

C

IN

R

L

R

F

1μF

C

FLY

V

IN

Enable

Flash Enable

Flash LED

Layout Considerations

For the AAT3119, the high charge pump switching

frequencies and large peak transient currents

require careful printed circuit board layout. As a

general rule for charge pump boost converters, the

three external capacitors should be located as

closely as possible to the device package with min-

imum length trace connections. Maximize ground

plane around the AAT3119 charge pump and make

sure all external capacitor are connected to the

immediate power ground plane. A local component

side ground plane is recommended. If this is not

possible due to layout area limitations, assure

good ground connections by the use of large or

multiple printed circuit board vias.

Refer to the basic AAT3119 evaluation board lay-

out shown in Figure 4 and the evaluation board

schematic shown in Figure 5 for an example of the

recommended charge pump layout design.

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