Data Sheet No. PD94127
IRU1050-33
5A LOW DROPOUT POSITIVE
FIXED 3.3V REGULATOR
DESCRIPTION
The IRU1050-33 is a low dropout three-terminal fixed 3.3V
output regulator with minimum of 5A output current ca-
pability. This product is specifically designed to provide
well regulated supply for low voltage IC applications re-
quiring 3.3V output. The IRU1050-33 is guaranteed to
have <1.3V dropout at full load current making it ideal to
provide well regulated output with supply voltage as low
as 4.6V input.
FEATURES
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
APPLICATIONS
Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
5V
C1
330uF
V
IN
3
IRU1050-33
V
OUT
2
C2
330uF
3.3V / 5A
Gnd
1
Figure 1 - Typical application of IRU1050-33.
PACKAGE ORDER INFORMATION
T
J
(°C)
0 To 150
3-PIN PLASTIC
T0-220 (T)
IRU1050-33CT
3-PIN PLASTIC
TO-263 (M)
IRU1050-33CM
2-PIN PLASTIC
Ultra Thin-Pak
TM
(P)
IRU1050-33CP
2-PIN PLASTIC
TO-252 (D-Pak)
IRU1050-33CD
Rev. 1.4
08/01/02
www.irf.com
1
IRU1050-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) ....................................................
Power Dissipation .....................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
7V
Internally Limited
-65°C To 150°C
0°C To 150°C
PACKAGE INFORMATION
3-Pin Plastic TO-220 (T)
FRONT VIEW
3-Pin Plastic TO-263 (M)
FRONT VIEW
2-Pin Plastic ULTRA THIN-PAK
TM
(P)
FRONT VIEW
2-Pin Plastic TO-252 (D-Pak)
FRONT VIEW
Tab is
V
OUT
3
V
IN
V
OUT
Gnd
Tab is
V
OUT
3
V
IN
V
OUT
Gnd
3
V
IN
Tab is
V
OUT
3
V
IN
2
1
2
Tab is
V
OUT
1
1
Gnd
1
Gnd
θ
JT
=2.7°C/W
θ
JA
=60°C/W
θ
JA
=35°C/W for 1" Square pad
θ
JA
=70°C/W for 1" Square pad
θ
JA
=70°C/W for 0.5" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over C
IN
=1mF, C
OUT
=10mF, and T
J
=0 to 1508C.
Typical values refer to T
J
=258C.
PARAMETER
Output Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Current Limit
Minimum Load Current (Note 3)
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
SYM
Vo
TEST CONDITION
Io=10mA, T
J
=258C, V
IN
=5V
Io=10mA, V
IN
=5V
Io=10mA, 4.7V<V
IN
<7V
V
IN
=3.3V, 10mA<Io<5A
Note 2, Io=5A
V
IN
=5V,
DVo=100mV
V
IN
=5V
30ms Pulse, V
IN
-Vo=3V, Io=5A
f=120Hz, Co=25mF Tantalum,
Io=2.5A, V
IN
-Vo=3V
V
IN
=5V, Io=10mA
T
J
=258C, 1000Hrs
T
J
=258C, 10Hz<f<10KHz
MIN
3.267
3.234
TYP
3.3
3.3
MAX
3.333
3.366
0.2
0.4
1.3
10
0.02
UNITS
V
%
%
V
A
mA
%/W
dB
%
%
%Vo
DVo
1.1
5.1
5
0.01
60
70
0.5
0.3
0.003
1
Note 1:
Low duty cycle pulse testing with Kelvin con-
nections is required in order to maintain accurate data.
Note 2:
Dropout voltage is defined as the minimum dif-
ferential voltage between V
IN
and V
OUT
required to main-
tain regulation at V
OUT
. It is measured when the output
voltage drops 1% below its nominal value.
Note 3:
Minimum load current is defined as the mini-
mum current required at the output in order for the out-
put voltage to maintain regulation. Typically the resistor
dividers are selected such that it automatically main-
tains this current.
2
www.irf.com
Rev. 1.4
08/01/02
IRU1050-33
PIN DESCRIPTIONS
PIN # PIN SYMBOL
Gnd
1
2
V
OUT
PIN DESCRIPTION
This pin must be connected to ground plane using a low inductance short connection.
The output of the regulator. A minimum of 10mF capacitor must be connected from this pin
to ground to insure stability.
The input pin of the regulator. Typically a large storage capacitor is connected from this
pin to ground to insure that the input voltage does not sag below the minimum dropout
voltage during the load transient response. This pin must always be 1.3V higher than V
OUT
in order for the device to regulate properly.
3
V
IN
BLOCK DIAGRAM
V
IN
3
2 V
OUT
+
1.25V
CURRENT
LIMIT
+
THERMAL
SHUTDOWN
Figure 1 - Simplified block diagram of the IRU1050-33.
1 Gnd
APPLICATION INFORMATION
Stability
The IRU1050-33 requires the use of an output capacitor as part of the frequency compensation in order to make the
regulator stable. Typical designs for microprocessor applications use standard electrolytic capacitors with a typical
ESR in the range of 50 to 100mV and an output capacitance of 500 to 1000mF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed RC time constant. The IRU1050-33 takes advantage of this
phenomena in making the overall regulator loop stable. For most applications a minimum of 100mF aluminum
electrolytic capacitor such as Sanyo MVGX series, Panasonic FA series as well as the Nichicon PL series insures
both stability and good transient response.
IR WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 1.4
08/01/02
www.irf.com
3
IRU1050-33
(D) TO-252 Package
2-Pin
A
C
B
K
L
M
458
D
E
O
J
N
78
Q
P
F
H
G
R
S
R1
SYMBOL
A
B
C
D
E
F
G
H
J
K
L
M
N
O
P
Q
R
R1
S
MIN
6.477
MAX
6.731
C
L
5.004 5.207
0.686 0.838
7.417 8.179
9.703 10.084
0.635 0.889
2.286 BSC
4.521 4.623
&1.52 &1.62
2.184 2.388
0.762 0.864
1.016
1.118
5.969 6.223
1.016
1.118
0
0.102
0.534 0.686
R0.31 TYP
R0.51 TYP
0.428 0.588
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
4
www.irf.com
Rev. 1.4
08/01/02
IRU1050-33
(M) TO-263 Package
3-Pin
A
K
S
V
B
H
M
E
U
L
P
D
G
N
C
R
C
L
SYMBOL
A
B
C
D
E
G
H
K
L
M
N
P
R
S
U
V
MIN
MAX
10.05 10.312
8.28
8.763
4.31
4.572
0.66
0.91
1.14
1.40
2.54 REF
14.73 15.75
1.40
1.68
0.00
0.254
2.49
2.74
0.33
0.58
2.286 2.794
08
88
2.41
2.67
6.50 REF
7.75 REF
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 1.4
08/01/02
www.irf.com
5
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