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L1084

Description
5A Adjustable Low Dropout Linear Regulator (LDO)
File Size229KB,8 Pages
ManufacturerETC
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L1084 Overview

5A Adjustable Low Dropout Linear Regulator (LDO)

L1084 Preview

NIKO-SEM
5A Adjustable Low Dropout
Linear Regulator (LDO)
FEATURES
L1084
TO-252, 263, 220
GENERAL DESCRIPTION
The L1084 is a positive and low dropout
three-terminal voltage regulator with 5A out-
put current capability. This device is design-
ed for use in low voltage applications that
offers lower dropout voltage and faster tran-
sient response.
This device is fully protected against over
current faults, over temperature operation,
reversed input polarity, reversed lead insert-
ion, transient voltage spike …etc.
On-Chips trimming the reference voltage to
1% and features the low dropout of maxi-
mum 1.45 volts.
The L1084 Series regulators are available
in the popular industry standard TO-220,
TO-263 and TO-252 packages.
Very easy to use, it requires only two
external resistors to set the output voltage
Low dropout voltage:
1.2V typical at up to 5A
Low ground current
Fast transient response
Current & thermal limiting
Line regulation: 0.5% typical
Load regulation: 0.5% typical
TO-220, TO-263 and TO-252 packages
APPLICATIONS
High current microprocessor supplies
Low voltage logic supply
Powering VGA & sound card
Portable instrumentation
Constant current regulator
Post regulator for switching power supply
TYPICAL APPLICATION
Vin
IN
L1084
OUT
ADJ
Vref
Vout
R1
+
Cin
10uF
+
Cout
10uF
Iadj
R2
Vo = Vref (1+R2/R1) + Iadj x R2
1. Cin needed if device is far from from filter capacitors.
2. Cout required for stability.
- Basic Adjustable Regulator Circuit -
1
MAY-31-2001
NIKO-SEM
5A Adjustable Low Dropout
Linear Regulator (LDO)
L1084
TO-252, 263, 220
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage
Power Dissipation
Thermal Resistance
Junction to Case,
θ
JC
Thermal Resistance
Junction to Ambient,
θ
JA
TO-220
TO-263
TO-252
7V
Internally
Limited
2.5 °C/W
Operating Junction
Temperature Range
Storage Temperature
Range
Lead Temperature
(Soldering, 10 Seconds)
0 to 125 °C
-40 to 150 °C
260 °C
50 °C/W
60 °C/W
70 °C/W
ELECTRICAL CHARACTERISTICS
(
Unless otherwise specified, T
A
= 25 °C.)
Parameter
Reference Voltage
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
Symbol
V
REF
Test Conditions
V
IN
= 5V, I
OUT
= 10mA
Typical
1.25V
1.2V
0.5%
0.5%
10mA
55µA
7.5A
0.003%
of V
OUT
72dB
Limits
1.23V
Min
1.27V
Max
1.45V
2%
2.5%
100µA
5.0A (Min)
V
D
ΔV
REF
= 1%, I
OUT
= 5A
REG
(LINE)
(V
OUT
+ 1.5V)
V
IN
7V, I
OUT
= 10mA
REG
(LOAD)
(V
IN
-V
OUT
) = 3V, 10mA
I
OUT
5A
I
O
I
ADJ
I
CL
V
N
R
A
f = 120Hz, C
ADJ
= 22µF for ADJ pin,
V
IN
= 5V, I
OUT
= 5A
1.5V
(V
IN
-V
OUT
)
5.75V
V
IN
- V
OUT
= 2V
Adjust Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
60dB (Min)
DEVICE SELECTION GUIDE
Device
Package
Marking
L1084D
TO-252
L1084D
L1084S
TO-263 (2-Lead)
L1084S
L1084S3
TO-263 (3-Lead)
L1084S3
L1084T
TO-220
L1084T
2
MAY-31-2001
NIKO-SEM
5A Adjustable Low Dropout
Linear Regulator (LDO)
L1084
TO-252, 263, 220
Typical Performance Characteristics
Vout=3.3V,Vin=5V,Iout=105mA/5A
Cin=10μF,Cout=10μF
MAY-31-2001
3
NIKO-SEM
5A Adjustable Low Dropout
Linear Regulator (LDO)
L1084
TO-252, 263, 220
PIN CONFIGURATIONS
Pin #
1
2
3
Function
Adjust
Output
Input
Note: TAB is Output Pin
4
MAY-31-2001
NIKO-SEM
5A Adjustable Low Dropout
Linear Regulator (LDO)
TO-263 (D
2
PAK) MECHANICAL DATA
mm
Min.
14.5
4.2
1.20
2.8
0.3
0.4
9
0.5
0.203
9.5
Typ.
15
Max.
15.8
4.7
1.35
L1084
TO-252, 263, 220
Dimension
A
B
C
D
E
F
G
Dimension
H
I
J
K
L
M
N
mm
Min.
1.0
9.8
6.5
1.5
0.7
4.83
5.08
1.4
5.33
Typ.
1.5
Max.
1.8
10.3
-0.102
8.5
5
MAY-31-2001

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