LM2772 datasheet(10/16 Pages) TI1

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LM2772

SNVS486A – DECEMBER 2006 – REVISED MARCH 2007

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Table 1. LM2772 Performance with Different Capacitor Configurations (1)

CAPACITOR

TYPICAL

CONFIGURATION

INPUT

OUTPUT

(VIN = 3.6V)

RIPPLE

CIN = 1µF,

COUT = 4.7µF,

54mV

4mV

C1, C2, C3 = 1µF

CIN = 1µF,

COUT = 2.2µF,

48mV

6mV

C1, C2, C3 = 1µF

CIN = 0.47µF,

COUT = 4.7µF,

83mV

5mV

C1, C2, C3 = 1µF

CIN = 0.47µF,

COUT = 3.3µF,

82mV

4mV

C1, C2, C3 = 1µF

CIN = 0.47µF,

COUT = 3.3µF,

83mV

5mV

C1, C2, C3 = 0.47µF

(1)

Refer to the text in the Recommended Capacitor Configurations section for detailed information on the data in this table

Layout Guidelines

Proper board layout will help to ensure optimal performance of the LM2772 circuit. The following guidelines are

recommended:

•

Place capacitors as close to the LM2772 as possible, and preferably on the same side of the board as the IC.

•

Use short, wide traces to connect the external capacitors to the LM2772 to minimize trace resistance and

inductance.

•

Use a low resistance connection between ground and the GND pin of the LM2772. Using wide traces and/or

multiple vias to connect GND to a ground plane on the board is most advantageous.

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