Dropout Regulator. LX8819 Datasheet

LX8819 Regulator. Datasheet pdf. Equivalent

Part LX8819
Description Dual Channel 1A Low Dropout Regulator
Feature LX8819 TM ® Dual Channel 1A Low Dropout Regulator D ATA S HEET DESCRIPTION KEY FEATURES ƒ Two Ind.
Manufacture Microsemi Corporation
Datasheet
Download LX8819 Datasheet



LX8819
LX8819
TM ® Dual Channel 1A Low Dropout Regulator
DATA SHEET
DESCRIPTION
The LX8819 is a dual channel Voltages (typically ±1% of its specified
positive-voltage linear regulator. This value) while the Bipolar output
dual regulator has one fixed output transistor has a low dropout voltage
coupled with an adjustable output. even at full output current (VDO < 1.25V
Each channel features a low dropout typical @ 1A).
and a high accuracy.
Thermal and Short Circuit Current
The LX8819 provides designers Protection are integrated on-chip and
with a flexible power management operate independently for each of the
www.DataShesoetl4uUti.ocnom, minimal printed circuit board regulator output.
area, and shorter design cycles.
The LX8819 regulator is stable with
Each channel can supply up to one a low-value output capacitor (typically
amp independently with a regulator 2.2µF on the outputs) allowing the
design optimized for system efficiency designers flexibility in external
by consuming minimal ground current component selection.
while directing quiescent current to Microsemi’s S-PAK and D-PAK
the load.
power packages enable maximum
The LX8819 features on-chip power dissipation and ease of assembly
trimming of the internal voltage using surface mount technology.
reference enabling precise output
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
KEY FEATURES
ƒ Two Independent Regulated
Outputs
ƒ Accurate Output Voltages
ƒ Typical Dropout of 1.25V at 1A
and 1.1V at 500mA
ƒ Independent Thermal and
Current Limit Protection
ƒ Low Profile 5 Lead SMT Power
Package
ƒ Low Tolerance Load
Regulation
ƒ Wide DC Supply Voltage of
3.5V to 10V
ƒ Loop Stability Independent of
Output Capacitor Type
APPLICATIONS
ƒ 5V to 3.3V / ADJ Regulators
ƒ Hard Disk Drives, CD-ROMs
ƒ ADSL and Cable Modems
ƒ Battery Charging Circuits
ƒ Instrumentation
ƒ PC Peripherals
VIN = 5V
22 F
VIN VOUT2
8819
GND VOUT1
ADJ
221
VOUT2 = 3.3V/2.5V @ 1A
10 F
VOUT1 = 1.8V @ 1A
10 F
499
TJ (°C)
0 to 125
PACKAGE ORDER INFO
Output V1
(Pin 4)
Adj.
Adj.
Output V2
(Pin 5)
3.3
2.5
Plastic S-PAK
DF 5 pin
RoHS Compliant
Transition DC: 0515
LX8819-33CDF
LX8819-25CDF
Plastic D-PAK
DT 5-Pin
LX8819-33CDT
LX8819-25CDT
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8819-33CDT-TR)
Copyright © 2003
Revision 1.0a, 4/29/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1



LX8819
LX8819
TM ® Dual Channel 1A Low Dropout Regulator
DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN)......................................................................................13.5V
Load Current (Internally Limited) .....................................................................1A
Power Dissipation ......................................................................Internally Limited
Short-Circuit Protection .......................................................................... Indefinite
Operating Temperature Range ......................................................... 0°C to 150°C
Maximum Operating Junction Temperature ................................................ 150°C
Storage Temperature Range...........................................................-65°C to 150°C
www.DataSheLete4aUd.cTomemperature (Soldering 180 seconds) ................................................ 235°C
RoHS Peak Package Solder Reflow Temperature
(40 second maximum exposure) ..................................................... 260°C (+0, -5)
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 5-Pin
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
5°C/W
30°C/W
DT Plastic D-PAK 5-Pin
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
6°C/W
32°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 25°C/W to > 40°C/W depending on mounting technique. (See Application Notes
Section: Thermal considerations)
PACKAGE PIN OUT
DF PACKAGE
(Top View)
RoHS 100% Matte Tin Lead Finish
TAB is GND
VOUT2
VOUT1
GND
ADJ
VIN
DT PACKAGE
(Top View)
Name
VIN
ADJ
GND
VOUT1
VOUT2
FUNCTIONAL PIN DESCRIPTION
Description
Positive unregulated supply input for the regulator – Bypass to GND with at least 2.2µF capacitance having low
ESR for good transient response.
Adjustable regulator feedback input – The output voltage can be set by two external resistors with the following
relationship:
VOUT1
=
VREF
⎜⎜⎝⎛1+
R1
R2
⎟⎟⎠⎞
+
IADJ
R1
where R1 is the resistor connected between VOUT1 and ADJ, and R2 is the resistor connected between ADJ and
GND.
Common terminal for ground reference – The input and output bypass capacitors should be connected to
this pin. In addition the tab on the S-Pak package and pin 3 are also used for heat sinking the device.
Adjustable regulator output (Regulator #1) – It is recommended to bypass to GND with at least 2.2µF. Size your
output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR
capacitor will improve the response to these load steps.
Fixed regulator output (Regulator #2) – It is recommended to bypass to GND with at least 2.2µF. Size your
output capacitor to meet the transient loading requirement. For dynamic loads, a lower ESR capacitor will
improve the response to these load steps.
Copyright © 2003
Revision 1.0a, 4/29/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2





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