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NIKO-SEM
5A Fixed Low Dropout
Linear Regulator (LDO)
L1084-3.3
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.
www.DataSheet4U.com
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-263
TO-220 and TO-252 packages.
FEATURES
z Very easy to use, it requires only two
external resistors to set the output voltage
z Low dropout voltage:
1.2V typical at up to 5A
z Low ground current
z Fast transient response
z Current & thermal limiting
z Line regulation: 0.5% typical
z Load regulation: 0.5% typical
z TO-263, TO-220 and TO-252 packages
APPLICATIONS
z High current microprocessor supplies
z Low voltage logic supply
z Powering VGA & sound card
z Portable instrumentation
z Constant current regulator
z Post regulator for switching power supply
TYPICAL APPLICATION
Vin>4.75V IN
L1084-3.3
OUT
Vout=3.3V
Cin
10uF
GND
Cout
10uF
RL
Basic Fixed Output Regulator Circuit
1 DEC-08-2001

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NIKO-SEM
5A Fixed Low Dropout
Linear Regulator (LDO)
L1084-3.3
TO-252,263,220
ABSOLUTE MAXIMUM RATINGS
z Maximum Supply Voltage
z Power Dissipation
z Thermal Resistance
Junction
www.DataShzeetT4Uh.ceormmal
to Case, θJC
Resistance
Junction to Ambient, θJA
TO-263
TO-252
TO-220
7V
Internally
Limited
2.5 °C/W
60 °C/W
70 °C/W
50 °C/W
z Operating Junction
Temperature Range
z Storage Temperature
Range
z Lead Temperature
(Soldering, 10 Seconds)
0 to 125 °C
-40 to 150 °C
260 °C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25 °C.)
Parameter
Symbol
Test Conditions
Output Voltage
(Fixed Version)
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
GND Pin Current
Current Limit
Vo VIN = 5V, IOUT = 10mA
VD ΔVREF = 1%, IOUT = 3A
REG(LINE) (VOUT + 1.5V) VIN 7V, IOUT = 10mA
REG(LOAD) (VIN -VOUT) = 3V, 10mA IOUT 3A
IO
IGND
ICL
1.5V (VIN -VOUT) 5.75V
VIN - VOUT = 2V
RMS Output Noise
Ripple Rejection
Ratio
VN
RA
f = 120Hz, CADJ = 22µF for ADJ pin,
VIN = 5V, IOUT = 5A
Typical
3.3V
1.2V
0.5%
0.5%
10mA
55µA
7.5A
0.003%
of VOUT
72dB
Limits
3.234VMin
3.367VMax
1.45V
2%
2.5%
100µA
5.0A (Min)
60dB (Min)
DEVICE SELECTION GUIDE
Device
L1084D-3.3 L1084S-3.3 L1084S3-3.3 L1084T-3.3
Package
Marking
TO-252 TO-263 (2-Lead) TO-263 (3-Lead) TO-220
L1084-33
L1084-33
L1084-33
L1084-33
2 DEC-08-2001

No Preview Available !

NIKO-SEM
5A Fixed Low Dropout
Linear Regulator (LDO)
PIN CONFIGURATIONS
L1084-3.3
TO-252,263,220
www.DataSheet4U.com
Pin #
Function
1 GND
2 Output
3 Input
Note: TAB is Output Pin
3 DEC-08-2001