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Datasheet: L1085D-3.3 (No company)

3a Fixed Low Dropout Linear Regulator (ldo)

 

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1
3A Fixed Low Dropout
Linear Regulator (LDO)
L1085-3.3
TO-252,263,220
JUL-05-2001
NIKO-SEM
GENERAL DESCRIPTION
The L1085 is a positive and low dropout
three-terminal voltage regulator with 3A 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 1.50 volts.
The L1085 Series regulators are available
in the popular industry standard TO-263
TO-220 and TO-252 packages.

FEATURES
Very easy to use, it requires only two
external resistors to set the output voltage
Low dropout voltage:
1.3V typical at up to 3A
Low ground current
Fast transient response
Current & thermal limiting
Line regulation: 0.5% typical
Load regulation: 0.5% typical
TO-263, TO-220 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>4.75V
Vout=3.3V
OUT
GND
Cin
10uF
Cout
10uF
RL
L1085-3.3
IN
Basic Fixed Output Regulator Circuit





2
3A Fixed Low Dropout
Linear Regulator (LDO)
L1085-3.3
TO-252,263,220
JUL-05-2001
NIKO-SEM
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage
7V
Operating Junction
Temperature Range
0 to 125 C
Power Dissipation
Internally
Limited
Storage Temperature
Range
-40 to 150 C
Thermal Resistance
Junction to Case,
JC
5 C/W
Lead Temperature
(Soldering, 10 Seconds)
260 C
Thermal Resistance
Junction to Ambient,
JA
TO-263
TO-252
TO-220

60 C/W
70 C/W
50 C/W




ELECTRICAL CHARACTERISTICS (
Unless otherwise specified, T
A
= 25 C.)
Parameter
Symbol
Test Conditions
Typical
Limits
Output Voltage
(Fixed Version)
V
o
V
IN
= 5V, I
OUT
= 10mA
3.3V
3.234V
Min
3.367V
Max
Dropout Voltage
V
D
V
REF
= 1%, I
OUT
= 3A
1.3V 1.50V
Line Regulation
REG
(LINE)
(V
OUT
+ 1.5V)
V
IN
7V, I
OUT
= 10mA
0.5% 2%
Load Regulation
REG
(LOAD)
(V
IN
-V
OUT
) = 3V, 10mA
I
OUT
3A
0.5% 2.5%
Minimum Load
Current
I
O
1.5V
(V
IN
-V
OUT
)
5.75V
10mA
GND Pin Current
I
GND
55
A 100
A
Current Limit
I
CL
V
IN
- V
OUT
= 2V
5.0A
4.0A (Min)
RMS Output Noise
V
N
0.003%
of V
OUT
Ripple Rejection
Ratio
R
A
f = 120Hz, C
ADJ
= 22
F for ADJ pin,
V
IN
= 5V, I
OUT
= 3A
72dB 60dB
(Min)
DEVICE SELECTION GUIDE
Device
L1085D-3.3 L1085S-3.3 L1085S3-3.3 L1085T-3.3 L1085S5-3.3
Package
TO-252
TO-263 (2-Lead) TO-263 (3-Lead) TO-220
TO-263 (5-Lead)
Marking
L1085-33 L1085-33 L1085-33 L1085-33 L1085-33




3
3A Fixed Low Dropout
Linear Regulator (LDO)
L1085-3.3
TO-252,263,220
JUL-05-2001
NIKO-SEM
PIN CONFIGURATIONS
Pin #
Function
1 GND
2 Output
3 Input
Note: TAB is Output Pin
Pin #
Function
2 GND
3 Output
5 Input
Note: TAB is Output Pin (For 5-pin)




4
3A Fixed Low Dropout
Linear Regulator (LDO)
L1085-3.3
TO-252,263,220
JUL-05-2001
NIKO-SEM


























TO-263 (D
2
PAK) MECHANICAL DATA
mm
mm
Dimension
Min. Typ. Max.
Dimension
Min. Typ. Max.
A 14.5 15 15.8 H 1.0 1.5 1.8
B 4.2 4.7 I 9.8 10.3
C
1.20 1.35 J 6.5
D 2.8 K 1.5
E 0.3 0.4 0.5 L 0.7 1.4
F -0.102 0.203 M 4.83 5.08 5.33
G
8.5
9
9.5
N




5
3A Fixed Low Dropout
Linear Regulator (LDO)
L1085-3.3
TO-252,263,220
JUL-05-2001
NIKO-SEM


































TO-263 (D
2
PAK) MECHANICAL DATA
mm
mm
Dimension
Min. Typ. Max.
Dimension
Min. Typ. Max.
A 14.5 15 15.8 H 1.0 1.5 1.8
B 4.2 4.7 I 9.8 10.3
C
1.20 1.35 J 6.5
D 2.8 K 1.5
E 0.3 0.4 0.5 L 0.7 1.4
F -0.102 0.203 M 4.83 5.08 5.33
G
8.5
9
9.5
N
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