9

http://www.elm-tech.com

Rev.1.0

14 -

This DC/DC converter may cause electromagnetic noise due to switching of coil under large current. Solu-

tion is necessary especially when the IC is used in wireless devices.

To reduce noise, this IC is designed in consideration of coil switching characteristics. The following meth-

ods are also effective to reduce noise.

• Use shield-type, or magnetic shield coil.

• Locate coil and diode to the LX terminal of IC as close as possible.

• Select ground wire as thick and short as possible.

• Connect ground wire of circuit to one point.

4) Remedies for noise

■Marking

Mark

Vout

Mark

Vout

2

2.*V

4

4.*V

3

3.*V

5

5.*V

a : Assembly lot No.

B to Z (I, O, X excepted)

b : Assembly lot No.

A to Z (I, O, X excepted)

Mark

Vout

Mark

Vout

0

*.0V

5

*.5V

1

*.1V

6

*.6V

2

*.2V

7

*.7V

3

*.3V

8

*.8V

4

*.4V

9

*.9V

SOT-89

SOP-89-5

• SOT-89 package

: ELM92xx1B

• SOT-89-5 package : ELM92xx2B(with CE)

c : the integer digit of the output voltage

d : the decimal digit of the output voltage