Microsemi

Linfinity Microelectronics Division

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

Page 3

Copyright

© 2000

Rev. 1.0a,2000-11-28

LX8630-xx

3A BiCMOS Very Low Dropout Regulators

A

M I CROS E M I

COM P A N Y

 


 
 







Positive supply input for the regulator. Bypass to GND with at

  
     


source is further than 1 inch from the device.

   
       !"#  
 $% 
    & 

regulation, rather it is needed for transient response. Size your output capacitor to meet the transient loading

requirement. If you have a very dynamic load, a larger capacitor will improve the response to these load steps.

GND

Reference ground. The input and output bypass capacitors should be connected to this pin. The tab on the TO-

220 and TO-263 packages along with the ground pin are also used for heatsinking the device.

ADJ

Feedback pin for the regulator. For the LX8630-00, the output voltage can be set by two external resistors with

SHDN

enable the regulator. This can be accomplished with a resistive pull-up. When low, it turns off the regulator and

puts the device in a low current shutdown state.

 

 

LX 8630-00

IN

SHDN

G N D

ADJ

OU T

V

IN

V

OU T

V

REF

C

IN

C

OU T

R

A

R

B

5

4

2

1

3













+

=

B

A

RE F

OU T

R

R

1

V

V

FIGURE 1