A
M I C R O S E M I
C O M P A N Y
LX8815
Dual Channel 1A Low Dropout Regulator
P
RELIMINARY
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
鹵1%
of it鈥檚 specified
value, while the BiPolar output transistor
has a low dropout voltage even at full
output current (V
DO
< 1.1V typ. @ 1A).
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碌F tantalum or 4.7碌F ceramic on the
outputs, allowing designers flexibility in
external component selection.
Linfinity鈥檚 S-PAK power package
offers maximum power dissipation and
ease of assembly using surface mount
technology.
Two Independent Regulated
W W W .
Microsemi
.
COM
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
IMPORTANT:
For the most current data, consult
MICROSEMI
鈥檚 website:
http://www.microsemi.com
5V to 3.3V Linear Regulator
Low Voltage Logic Supplies
Active SCSI Terminators
Battery Charging Circuits
Instrumentation
PC Peripherals
V
IN
R
3
0.1鈩?/div>
C
1
10碌F
BIAS
1.25V
V
REF
錚?/div>
R
錚?/div>
V
OUT
2
=
1.25
脳 錚?/div>
1
+
1
錚?+
I
ADJ
脳
R
2
錚?/div>
R
錚?/div>
錚?/div>
2
錚?/div>
4
1
+
-
5
V
OUT1
C
2
4.7碌F
+
-
GND
3
V
OUT2
R
1
Adjustable or Fixed
LX 8 8 1 5
LX 8 8 1 5
2
C
3
4.7碌F
R
2
Note: Application circuit above using ceramic capacitors, C
1
requires R
3
(0.075 to 0.3鈩?. For Tantalum capacitors: R
3
is not used
a n d C
1
, C
2
, and C
3
> 2
碌F.
R1 and R2 used with LX88xx-xx only.
Copyright
漏
2000
Rev. 0.2a, 2000-11-20
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
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