Microsemi

Linfinity Microelectronics Division

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

Page 1

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





The LX8630 family are positive very

low dropout regulators.

They are

designed to provide a power supply for

very low headroom applications, such as

3.3V – 2.5V.

BiCMOS

technology

allows

an

effective series pass element resistance,

 

dropout voltage of 450mV at 3A.

Low Quiescent Current and Logic-

Controlled

Shutdown

help

conserve

battery life and increase system efficiency.

Typical quiescent current is under 400

A

irrespective of load current, while the

Shut

     

device will enter shutdown mode when the

SHDN pin is pulled low.

Thermal and Short-Circuit Current

Limiting: the LX8630 limits the current

when the output is shorted, protecting the

sensitive load circuits.

The device will

also turn off if the junction temperature

exceeds 150

°

Available in Popular TO-220 and

TO-263

Power

Packages:

adjustable

versions have five leads, and fixed output

voltage devices are supplied in three lead

packages.

IMPORTANT: For the most current data, consult

MICROSEMI’s website: http://www.microsemi.com

 

 

Dropout Voltage Typically

450mV at 3A and 50mV at

10mA

Low Quiescent Current,

Typically Under 400µA,

irrespective of Load

Shutdown Current 10µA

Adjustable Output Version in

5-Pin TO-220 & TO-263

Packages

Low Reverse Leakage

Current

Short-Circuit and Thermal

Shutdown Protection







3.3V & 2.5V Supplies for

Memory, Microprocessors,

Clock Circuits, Etc.

Portable Equipment


 


 

* Adjustable 5 lead ve rsion only

Reverse

V oltage

Sense

T herm al

S hu tdown

V

IN

GN D

ADJ*

V

OU T

C urrent

Lim it

C harge

Pum p

R

A

R

B

LX 8 630-xx S im p lified B lock D iagra m

1.25V

R eferenc e

C urrent

V

IN

/2

LX 8630-00

LX 8630-25

LX 8630-33

25K

25K

41K

25K

R

A

R

B

--

SHD N *

+

-

  

°C) Output

Voltage

P

Plastic TO-220

3-Pin

P

Plastic TO-220

5-Pin

DD

Plastic TO-263

3-Pin

DD

Plastic TO-263

5-Pin

3.3

LX8630-33CP

-

LX8630-33CDD

-

2.5

LX8630-25CP

-

LX8630-25CDD

-

0 to 125

ADJ(00)

-

LX8630-00CP

-

LX8630-00CDD

Note: Available in Tape & Reel.

Append the letter “T” to the part number. (i.e. LX8630-33CDDT)