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DROPOUT REGULATOR. LX8821 Datasheet |
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LX8821
TM ® DUAL CHANNEL 2.5A LOW DROPOUT REGULATOR
PRODUCTION DATA SHEET
DESCRIPTION
The LX8821 is a positive-voltage Power sequencing logic ensures
linear regulator with one fixed and proper startup regardless of the
one adjustable output featuring low- level of VCTRL or VPWR. The
dropout and high accuracy.
LX8821 outputs remain off while
To maximize efficiency, the VPWR < 2.2V.
LX8821 accepts two supply voltage Thermal and Short Circuit
inputs for the VCONTROL and VPOWER Current Protection are integrated
sections. This configuration reduces on-chip and operate independently
power dissipation by operating the for each regulator output.
www.DataShereegt4uUla.ctoomr near dropout (VPWR-VOUT = The LX8821 regulator is stable
VDO = 0.4V @ 2A) while providing with a wide range of output
sufficient operating headroom for the capacitance and ESR; typically
control logic.
10μF tantalum or ceramic on the
Each channel can supply up to outputs is sufficient.
2.5A independently with a regulator Microsemi uses a low profile
design optimized for system power package with low thermal
efficiency by consuming minimal resistance and ease of assembly
ground current and directing using surface mount technology.
quiescent current to the load
The internal voltage reference is
trimmed at wafer level, enabling
precise output voltages, typically
±1% of its specified value.
IMPORTANT: For the most current data, consult Microsemi’s website: http://www.microsemi.com
KEY FEATURES
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
VPOWER
10µF
VCONTROL
PRODUCT HIGHLIGHT
VPWR
VOUT1
Part VOUT2
VCONTROL
1µF GND ADJ
LX8821
33µF
R1
33µF
R2
VOUT1
VOUT2
VOUT2
= 1.25•
⎢⎣⎡1 +
R1⎤
R2 ⎥⎦
+
I ADJ
•
R1
GROUND
TA (°C)
0 to 100
PACKAGE ORDER INFO
Output V1
1.5V
Output V2
Adjustable
Plastic S-Pak
DF 7-Pin
RoHS Compliant
LX8821CDF
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8821CDF-TR)
Copyright © 2005
Rev. 1.1, 2005-03-09
Microsemi
Microsemi Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
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LX8821
TM ® DUAL CHANNEL 2.5A LOW DROPOUT REGULATOR
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VCTRL, VPWR).........................................................................13.5V
Load Current (Internally Limited) ..................................................................3.0A
Power Dissipation ......................................................................Internally Limited
Short-Circuit Protection .......................................................................... Indefinite
Operating Junction Temperature.................................................................. 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Peak Package Solder Reflow Temperature
(40 second maximum exposure) ..................................................... 260°C (+0, -5)
www.DataSheet4U.com
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
DF Plastic S-Pak 7-Pin
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
4.5°C/W
20 - 50°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow. θJA can vary from 10°C/W to > 50°C/W
depending on mounting technique. (See Application Notes Section: Thermal considerations)
PACKAGE PIN OUT
TAB is GND
7 NC
6 ADJV2
5 VOUT2
4 GND
3 VPWR
2 VOUT1
1 VCTRL
DF PACKAGE
(Top View)
Pin 4 and Tab are common
RoHS 100% Matte Tin Lead Finish
FUNCTIONAL PIN DESCRIPTION
PIN
NAME
DESCRIPTION
1
VCTRL
Unregulated input voltage supply, provides bias for control circuitry, (VCTRL – VOUT) > 1V.
2
VOUT1
Regulator #1 fixed output voltage, 1.5V nominal.
3
VPWR
Unregulated input voltage supply for power section. For proper operation: (VPWR – VOUT) > VDROPOUT.
4
GND
Common terminal for ground reference, Tab of package is internally connected to this pin.
5
VOUT2
Regulator #2 output
6
ADJ V2
Regulator #2 feedback voltage, servos to 1.25V. Using external resistors to program VOUT2.
7 --- Not used, no internal connection, may be left floating or connected to any other pin or voltage.
Copyright © 2005
Rev. 1.1, 2005-03-09
Microsemi
Microsemi Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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