A
M I C R O S E M I
C O M P A N Y
LX8817
Dual Channel 2.5A Low Dropout Regulator
P
RELIMINARY
The LX8817 is a dual channel
positive-voltage linear regulator. This
dual regulator has one fixed output
coupled with an adjustable output.
Each channel features low-dropout
and high accuracy.
The LX8817 utilizes dual inputs that
can be used as separate sources for the
control and power sections. This
configuration
reduces
power
dissipation by operating the regulator
near dropout (V
PWR
-V
OUT
= V
DO
=
0.6V @ 2.5A) while providing
sufficient operating headroom for the
control logic.
The LX8817 provides designers
with an efficient flexible power
management solution, minimal printed
circuit board area, and shorter design
cycles.
Each channel can supply up to 2.5A
independently with a regulator design
optimized for system efficiency by
consuming minimal ground current
and directing quiescent current to the load.
The
LX8817
features
on-chip
trimming of the internal voltage
reference, enabling precise output
voltages, typically
鹵1%
of it鈥檚 specified
value.
Power sequencing logic ensures proper
startup regardless of the level of V
CTRL
or V
PWR
. The LX8817 outputs remain
off while V
PWR
< 2.7V.
Thermal and Short Circuit Current
Protection are integrated on-chip and
operate independently for each regulator
output.
The LX8817 regulator is stable with a
low-value output capacitor, typically
10碌F tantalum or 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 0.6V at Rated
Current
Independent Thermal and
Current Limit Protection
Low Profile 7 Lead SMT Power
Package
Low Tolerance Line (0.2%) and
Load (0.4%) Regulation
Wide DC Supply Voltage of 3.0V
to 10.0V
Loop Stability Independent of
Output Capacitor Type
3.3V to 2.5V/ADJ Linear
Regulator
Low Voltage Logic Supplies
Active SCSI Terminators
Battery Charging Circuits
Instrumentation
PC Peripherals
IMPORTANT:
For the most current data, consult
MICROSEMI
鈥檚 website:
http://www.microsemi.com
V
PW R
3
2
V
1
LX 8817
V
C TR L
1
4
5
6
V
2
LX 8 8 1 7
LX 8 8 1 7
T
A
(擄C)
0 to 125
O
UTPUT
V
1
2.5V
O
UTPUT
V
2
Adj
DF
Plastic S-PAK
7-PIN
LX8817-2500CDF
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number. (i.e. LX8817-xxxxC__T)
Copyright
漏
2000
Rev. 0.2a, 2000-09-15
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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