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LX8821 Datasheet(PDF) 1 Page - Microsemi Corporation

Part No. LX8821
Description  DUAL CHANNEL 2.5A LOW DROPOUT REGULATOR
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Maker  MICROSEMI [Microsemi Corporation]
Homepage  http://www.microsemi.com
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LX8821 Datasheet(HTML) 1 Page - Microsemi Corporation

   
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PRODUCTION DATA SHEET
Microsemi
Microsemi Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
© 2005
Rev. 1.1, 2005-03-09
LX8821
DUAL CHANNEL 2.5A LOW DROPOUT REGULATOR
TM
®
DESCRIPTION
The LX8821 is a positive-voltage
linear regulator with one fixed and
one adjustable output featuring low-
dropout and high accuracy.
To
maximize
efficiency,
the
LX8821 accepts two supply voltage
inputs for the VCONTROL and VPOWER
sections. This configuration reduces
power dissipation by operating the
regulator near dropout (VPWR-VOUT =
VDO = 0.4V @ 2A) while providing
sufficient operating headroom for the
control logic.
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 internal voltage reference is
trimmed at wafer level, enabling
precise output voltages, typically
±1% of its specified value.
Power sequencing logic ensures
proper startup regardless of the
level of VCTRL or VPWR.
The
LX8821 outputs remain off while
VPWR < 2.2V.
Thermal
and
Short
Circuit
Current Protection are integrated
on-chip and operate independently
for each regulator output.
The LX8821 regulator is stable
with a wide range of output
capacitance and ESR; typically
10
μF tantalum or ceramic on the
outputs is sufficient.
Microsemi uses a low profile
power package with low thermal
resistance and ease of assembly
using surface mount technology.
IMPORTANT: For the most current data, consult Microsemi’s website: http://www.microsemi.com
KEY FEATUR ES
Two Independent Regulated
Outputs
Wide DC Supply Voltage of 3.0V to
10.0V
Accurate Output Voltages
Low Tolerance Line (0.5%) and
Load (0.5%) Regulation
Max. Dropout of 0.6V at Rated
Current
Independent Thermal and Current
Limit Protection
Loop Stability Independent of
Output Capacitor
Type SMT Power Package
APPLICATIONS/BENEFITS
ASIC, Memory, I/O
Low Voltage Logic Supplies
Active SCSI Terminators
Battery Charging Circuits
PC Peripherals
Instrumentation
PRODUCT H I GHLIGHT
Part
V
PWR
V
CONTROL
GND
ADJ
V
OUT2
V
OUT1
V
POWER
10µF
V
CONTROL
1µF
R2
R1
33µF
33µF
GROUND
V
OUT2
V
OUT1
LX8821
R1
I
R2
R1
1
1.25
V
ADJ
OUT2
+
⎥⎦
⎢⎣
⎡ +
=
PACKAGE ORDER INFO
DF
Plastic S-Pak
7-Pin
TA (°C)
Output V1
Output V2
RoHS Compliant
0 to 100
1.5V
Adjustable
LX8821CDF
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8821CDF-TR)


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