LX8630 Microsemi Corporation, LX8630 Datasheet - Page 3

• Manufacturer Part Number: LX8630
• Description: 3a Bicmos Very Low Dropout Regulators
• Manufacturer: Microsemi Corporation

Copyright
Rev. 1.0b, 2001-02-20
A

M I C R O S E M I


SHDN
GND
V
ADJ
V
V
OUT
IN

IN
2000
C
IN


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.
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.
Feedback pin for the regulator. For the LX8630-00, the output voltage can be set by two external resistors with
the following relationship: V
R
Shutdown pin. For the LX8630-00, this pin has a threshold of about V
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.
B
is the resistor connected between ADJ and GND pin.

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
1
C O M P A N Y
IN
S H D N
2
LX 8630-00
        
   
        
       
     
OUT
              
              
= 1.25V * (1+R
Linfinity Microelectronics Division
FIGURE 1

G N D
Microsemi
3
–
Typical Application
A
/R
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3A BiCMOS Very Low Dropout Regulators


O U T
B



A D J
) where R
5
4
A
V
is the resistor connected between V
   

 
    

O U T
P
V
RODUCTION
R E F
IN
V
/2, it should be actively pulled high to
R E F
1
R
R
D
A
B
ATA
R
R
A
B
S
HEET
C
O U T
OUT
LX8630-xx
V
and ADJ,
O U T
Page 3