MAX8640Z(2007-07) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX8640Z
(Rev.:2007-07)

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters

Maxim Integrated 

Tiny 500mA, 4MHz/2MHz Synchronous

Step-Down DC-DC Converters

their small size and low ESR. Make sure the capacitor

maintains its capacitance over temperature and DC

bias. Capacitors with X5R or X7R temperature charac-

teristics typically perform well. The output capacitance

can be very low; see the Selector Guide for recom-

mended capacitance values. For optimum load-tran-

sient performance and very low output ripple, the output

capacitor value in µF should be equal to or larger than

the inductor value in µH.

Input Capacitor

The input capacitor, C1, reduces the current peaks

drawn from the battery or input power source and

reduces switching noise in the IC. The impedance of C1

at the switching frequency should be kept very low.

Ceramic capacitors are recommended due to their

small size and low ESR. Make sure the capacitor main-

tains its capacitance over temperature and DC bias.

Capacitors with X5R or X7R temperature characteristics

PART

MAX8640YEXT08

MAX8640YEXT11

MAX8640YEXT12

MAX8640YEXT13

MAX8640YEXT15

MAX8640YEXT16

MAX8640YEXT18

MAX8640YEXT19

MAX8640YEXT25

MAX8640YELT08

MAX8640YELT11

MAX8640YELT12

MAX8640YELT13

MAX8640YELT15

MAX8640YELT16

MAX8640YELT18

MAX8640YELT19

MAX8640YELT25

MAX8640ZEXT08

MAX8640ZEXT11

MAX8640ZEXT12

MAX8640ZEXT13

MAX8640ZEXT15

MAX8640ZEXT18

MAX8640ZELT08

MAX8640ZELT11

MAX8640ZELT12

MAX8640ZELT13

MAX8640ZELT15

MAX8640ZELT18

OUTPUT

VOLTAGE (V)

0.8

1.1

1.2

1.3

1.5

1.6

1.8

1.9

2.5

0.8

1.1

1.2

1.3

1.5

1.6

1.8

1.9

2.5

0.8

1.1

1.2

1.3

1.5

1.8

0.8

1.1

1.2

1.3

1.5

1.8

FREQUENCY

(MHz)

1.2

1.7

1.8

1.9

2.0

2.0

2.0

2.0

1.7

1.2

1.7

1.8

1.9

2.0

2.0

2.0

2.0

1.7

2.4

3.4

3.6

3.7

3.9

4.0

2.4

3.4

3.6

3.7

3.9

4.0

Selector Guide

RECOMMENDED COMPONENTS

L1 (µH)

C2 (µF)

2.2

10

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

10

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

2.2

4.7

1

4.7

1

2.2

1

2.2

1

2.2

1

2.2

1

2.2

1

4.7

1

2.2

1

2.2

1

2.2

1

2.2

1

2.2

TOP MARK

ACQ

ACR

ACS

ACG

ADD

ADB

ACI

ACH

ACJ

NB

NC

ND

NE

NF

NG

NH

NI

NJ

ACL

ACM

ACN

ACO

ACP

ACU

NK

NL

NM

NN

NO

NP

_______________________________________________________________________________________ 7

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