IRU1015-33
1
Rev. 1.2
08/01/02
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU1015-33 is a low dropout three terminal fixed
3.3V output regulator with minimum of 1.5A output cur-
rent capability. This product is specifically designed to
provide well regulated supply for low voltage IC applica-
tions requiring 3.3V output. The IRU1015-33 is guaran-
teed 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.
1.5A LOW DROPOUT POSITIVE
FIXED 3.3V REGULATOR
T
J
(C) 3-PIN PLASTIC 3-PIN PLASTIC 2-PIN PLASTIC 2-PIN PLASTIC
TO-220 (T) TO-263 (M) Ultra Thin-Pak
TM
(P) TO-252 (D-Pak)
0 To 150 IRU1015-33CT IRU1015-33CM IRU1015-33CP IRU1015-33CD
Figure 1 - Typical application of IRU1015-33.
Data Sheet No. PD94123
FEATURES
APPLICATIONS
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
Standard 3.3V Chip Set and Logic Applications
PACKAGE ORDER INFORMATION
5V
3.3V / 1.5A
C1
100uF
C2
100uF
IRU1015-33
1
2
3
V
OUT
Gnd
V
IN
IRU1015-33
2
Rev. 1.2
08/01/02
www.irf.com
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) .................................................... 7V
Power Dissipation ..................................................... Internally Limited
Storage Temperature Range ...................................... -65C To 150C
Operating Junction Temperature Range ..................... 0C To 150C
PACKAGE INFORMATION
3-PIN PLASTIC TO-220 (T) 3-PIN PLASTIC TO-263 (M) 2-PIN PLASTIC ULTRA THIN-PAK
TM
(P) 2-PIN PLASTIC TO-252 (D-Pak)
JT
=2.7
C/W
JA
=60
C/W
JA
=35
C/W for 1" Square pad
JA
=70
C/W for 1" Square pad
JA
=70
C/W for 0.5" Sq pad
Unless otherwise specified, these specifications apply over C
IN
=1
F, C
OUT
=10
F, and T
J
=0 to 150
8
C.
Typical values refer to T
J
=25
8
C.
ELECTRICAL SPECIFICATIONS
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 this current is automati-
cally maintained.
Gnd
V
IN
V
OUT
1
2
3
FRONT VIEW
Tab is
V
OUT
Gnd
V
OUT
V
IN
Tab is
V
OUT
FRONT VIEW
1
2
3
Gnd
V
IN
FRONT VIEW
1
3
Tab is
V
OUT
Gnd
V
IN
1
3
FRONT VIEW
Tab is
V
OUT
Io=10mA, T
J
=25
8
C, V
IN
=5V
Io=10mA, V
IN
=5V
Io=10mA, 4.7V<V
IN
<7V
V
IN
=5V, V
ADJ
=0, 10mA<Io<1.5A
Note 2, Io=1.5A
V
IN
=5V,
D
Vo=100mV
V
IN
=5V
30ms Pulse, V
IN
-Vo=3V, Io=1.5A
f=120Hz, Co=25
m
F Tantalum,
Io=0.75A, V
IN
-Vo=3V
Io=10mA, V
IN
-Vo=1.5V, T
J
=25
8
C
V
IN
=5V, V
ADJ
=0V, Io=10mA
T
J
=125
8
C, 1000Hrs
T
J
=25
8
C, 10Hz<f<10KHz
PARAMETER
SYM TEST CONDITION
MIN TYP MAX UNITS
Output Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Current Limit
Minimum Load Current (Note 3)
Thermal Regulation
Ripple Rejection
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise
Vo
D
Vo
3.267
3.234
1.6
60
3.300
3.300
1.1
5
0.01
70
0.2
0.5
0.3
0.003
3.333
3.366
0.2
0.4
1.3
10
0.02
5
1
V
%
%
V
A
mA
%/W
dB
m
A
%
%
%Vo
IRU1015-33
3
Rev. 1.2
08/01/02
www.irf.com
APPLICATION INFORMATION
PIN DESCRIPTIONS
PIN # PIN SYMBOL
PIN DESCRIPTION
Figure 2 - Simplified block diagram of the IRU1015-33.
BLOCK DIAGRAM
This pin must be connected to ground plane using a low inductance short connection.
The output of the regulator. A minimum of 10
m
F 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 drop out
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.
1
2
3
Gnd
V
OUT
V
IN
V
IN
3
1 Gnd
2 V
OUT
THERMAL
SHUTDOWN
CURRENT
LIMIT
1.25V
+
+
Stability
The IRU1015-33 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 100m
V
and an output capacitance of 500 to 1000
m
F. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed RC time constant. The IRU1015-33 takes advantage of this
phenomena in making the overall regulator loop stable. For most applications a minimum of 100
m
F 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
IRU1015-33
4
Rev. 1.2
08/01/02
www.irf.com
(D) TO-252 Package
2-Pin
SYMBOL
A
B
C
D
E
F
G
H
J
K
L
M
N
O
P
Q
R
R1
S
MIN
6.477
5.004
0.686
7.417
9.703
0.635
4.521
&
1.52
2.184
0.762
1.016
5.969
1.016
0
0.534
0.428
MAX
6.731
5.207
0.838
8.179
10.084
0.889
4.623
&
1.62
2.388
0.864
1.118
6.223
1.118
0.102
0.686
0.588
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
A
B
C
D
F
G
H
45
8
K
M
Q
7
8
N
P
R
S
R1
L
C
E
J
L
O
R0.31 TYP
R0.51 TYP
2.286 BSC
IRU1015-33
5
Rev. 1.2
08/01/02
www.irf.com
(M) TO-263 Package
3-Pin
SYMBOL
A
B
C
D
E
G
H
K
L
M
N
P
R
S
U
V
MIN
10.05
8.28
4.31
0.66
1.14
14.73
1.40
0.00
2.49
0.33
2.286
0
8
2.41
MAX
10.312
8.763
4.572
0.91
1.40
15.75
1.68
0.254
2.74
0.58
2.794
8
8
2.67
6.50 REF
7.75 REF
2.54 REF
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
A
E
M
L
N
U
C
B
K
P
V
R
S
H
G
D
CL
PDF 
ZIP