Microsemi

Linfinity Microelectronics Division

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

Page 1

Copyright

© 2000

Rev. 0.2a, 2000-11-20

LX8815

Dual Channel 1A Low Dropout Regulator

A

M I CROS E M I

COM P A N Y





The LX8815 is a dual channel

positive-voltage linear regulator. This

dual regulator has either one fixed

output coupled with an adjustable

output or two fixed outputs.

Each

channel features low-dropout and high

accuracy.

The

LX8815

provides

designers

with a flexible power management

solution, minimal printed circuit board

area, and shorter design cycles.

Each channel can supply up to one

amp independently with a regulator

design optimized for system efficiency

by consuming minimal ground current

and directing quiescent current to the

load.

The

LX8815

features

on-chip

trimming of the internal

voltage reference enabling precise output

voltages, typically

±1% of it’s specified

value, while the BiPolar output transistor

has a low dropout voltage even at full

Thermal and Short Circuit Current

Protection are integrated on-chip and

operate independently for each regulator

output.

The LX8815 regulator is stable with a

low-value output capacitor, typically

3.3

µF tantalum or 4.7µF ceramic on the

outputs, allowing designers flexibility in

external component selection.

Linfinity’s

S-PAK

power

package

offers maximum power dissipation and

ease of assembly using surface mount

technology.

IMPORTANT: For the most current data, consult

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

 

 

Two Independent Regulated

Outputs

Accurate Output Voltages

Max. Dropout of 1.1V at Rated

Current

Independent Thermal and

Current Limit Protection

Low Profile 5 Lead SMT Power

Package

Low Tolerance Line (0.2%) and

Load (0.4%) Regulation

Wide DC Supply Voltage of 4.0V

to 12.0V

Loop Stability Independent of

Output Capacitor Type







5V to 3.3V Linear Regulator

Low Voltage Logic Supplies

Active SCSI Terminators

Battery Charging Circuits

Instrumentation

PC Peripherals


  


    

 

BIAS

1.25V

V

REF

1

3

V

IN

GND

5

4

2

+

+

-

-

V

OUT1

V

OUT2

R

3

0.1

Ω

C

1

10

µF

C

2

4.7

µF

R

1

R

2

C

3

4.7

µF

2

2

1

2

1

25

.

1

R

I

R

R

V

ADJ

OUT

×

+









+

×

=

Note: Application circuit above using ceramic capacitors, C

For Tantalum capacitors: R

and C

R1 and R2 used with LX88xx-xx only.

Adjustable or Fixed