Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 8

Copyright

© 2000

Rev. 2.1d, 2001-03-15

LX8384x-xx

5A Low Dropout Positive Regulators

A

M I CROS E M I

COM P A N Y

 

 

10µ F

LX 8384x

R1

121

R2

365

IN

AD J

OU T

F IG URE 4

- IM PR O V IN G R IPPLE R E JE C TIO N

V

IN

V

OUT

C1

10µ F *

150µ F

+

+

* C 1 im proves ripple rejection.

X

C

should be

R 1 at ripple

frequency.

(N ote A)

≈

C1 *

10µ F

LX 8384 x

R1

121

R2

1k

IN

AD J

OU T

F IG URE 5

- 1.2V - 8V AD JU STABLE R E G U LA TO R

V

IN

V

OUT

**

C2

100µ F

+

+

* N eeded if device is far from filter capacitors.













+

=

R1

R2

1

1.25V

*V

*

OU T

(N ote A)

10 µ F

36 5

Ω

1%

LX 8384x

10 0µ F

1k

1k

12 1

Ω

1%

2N 390 4

IN

AD J

OU T

FIG U R E 6

- 5V R E G U LA TO R W ITH S H U TD O W N

TTL

O u tput

V

IN

5V

+

+

(N o te A )

LX 838 4x

IN

AD J

OUT

V

IN

3.3 V

10 µ F T an talum or

10 0µ F A lum inum

M in. 15 µ F T an talu m or

10 0µ F A lum inum capacito r. M ay

be in cre as ed w ith ou t lim it. E S R

m us t be le ss th an <40 0m

Note A:

X)

DROPOUT(MA

OUT

IN(MIN)

V

)

V

(

V

Intended

+

=