LM2771 datasheet(10/16 Pages) TI1

Teilenummer	LM2771

Bauteilbeschribung	Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter

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Hersteller	TI1 [Texas Instruments]

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LM2771

SNVS435 – MARCH 2006

www.ti.com

Table 1. LM2771 Performance with Different Capacitor Configurations (1)

CAPACITOR

TYPICAL

CONFIGURATION

INPUT

OUTPUT

(VIN = 3.6V)

RIPPLE

CIN = 1µF,

COUT = 4.7µF,

45mV

8mV

C1 = 1µF

CIN = 1µF,

COUT = 2.2µF,

94mV

19mV

C1 = 1µF

CIN = 0.47µF,

COUT = 4.7µF,

105mV

11mV

C1 = 1µF

CIN = 0.47µF,

COUT = 3.3µF,

102mV

16mV

C1 = 1µF

CIN = 0.47µF,

COUT = 3.3µF,

120mV

15mV

C1 = 0.33µF

(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 LM2771 circuit. The following guidelines are

recommended:

•

Place capacitors as close to the LM2771 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 LM2771 to minimize trace resistance and

inductance.

•

Use a low resistance connection between ground and the GND pin of the LM2771. Using wide traces and/or

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

10

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