Data Sheet No. PD94135
IRU1010-18 & (PbF)
1A LOW DROPOUT POSITIVE
FIXED 1.8V REGULATOR
FEATURES
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
Available in SOT-223, D-Pak, Ultra Thin-Pak
TM
and 8-Pin SOIC Surface-Mount Packages
DESCRIPTION
The IRU1010-18 is a low dropout three-terminal fixed out-
put regulator with minimum of 1A output current capabil-
ity. This product is specifically designed to provide well
regulated supply for low voltage IC applications as well
as generating clock supply for PC applications. The
IRU1010-18 is guaranteed to have <1.3V dropout at full
load current making it ideal to provide well regulated with
3.8V input supply. The IRU1010-18 is specifically de-
signed to be stable with low cost aluminum capacitors
while maintaining stability with low ESR tantalum caps.
APPLICATIONS
Low Voltage IC Supply Applications
DSP Core Voltage
8-Lead SOIC (IRU1010-18CS) is also available
LEAD-FREE
TYPICAL APPLICATION
3.3V
C1
10uF
V
IN
3
2
1
C2
10uF
IRU1010-18
V
OUT
1.8V / 1A
Gnd
Figure 1 - Typical set-up of the IRU1010-18 in a 3.3V to 1.8V regulator application.
Rev. 1.4
3/14/2005
www.irf.com
1
IRU1010-18 & (PbF)
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 125°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak)
2-PIN ULTRA THIN-PAK
TM
(P)
8-PIN PLASTIC SOIC (S)
3-PIN PLASTIC SOT-223 (Y)
3
V
IN
Tab is
V
OUT
3
V
IN
Tab is
V
OUT
1
Gnd
1
Gnd
V
IN
NC
NC
Gnd
1
2
3
4
8
7
6
5
V
OUT
V
OUT
V
OUT
V
OUT
3
V
IN
V
OUT
Gnd
Tab is
V
OUT
2
1
θ
JA
=70°C/W for 0.5" Sq pad
θ
JA
=70°C/W for 0.5" Sq pad
θ
JA
=55°C/W for 1" Sq pad
θ
JA
=90°C/W for 0.4" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over C
IN
=1µF, V
IN
=5V, C
OUT
=10µF and T
J
=0 to 1258C.
Typical values refer to T
J
=258C.
PARAMETER
Output Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Current Limit
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
SYM
Vo
TEST CONDITION
Io=10mA, T
J
=258C
Io=10mA
Io=10mA, 4.75V<V
IN
<7V
10mA<Io<1A
Io=1A
∆Vo=100mV
30ms Pulse, Io=1A
f=120Hz, Co=25µF Tantalum,
Io=0.5A
Io=10mA
T
J
=1258C, 1000Hrs
T
J
=258C, 10Hz<f<10KHz
MIN
1.782
1.764
TYP
1.800
1.800
MAX
1.818
1.836
7
17
1.3
UNITS
V
mV
mV
V
A
%/W
dB
%
%
%Vo
1.1
0.01
70
0.5
0.3
0.003
Note 1:
Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data.
Note 2:
Dropout voltage is defined as the minimum differential voltage between V
IN
and V
OUT
required to maintain
regulation at V
OUT
. It is measured when the output voltage drops 1% below its nominal value.
2
www.irf.com
Rev. 1.4
3/14/2005
IRU1010-18 & (PbF)
PIN DESCRIPTIONS
PIN#
1
2
3
PIN SYMBOL
Gnd
V
OUT
V
IN
PIN DESCRIPTION
Ground pin. This pin must be connected to ground plane using a low inductance short
connection.
The output of the regulator. This pin is also connected to the tab of the package. An output
capacitor must be connected to this pin to insure stability of the regulator.
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.
BLOCK DIAGRAM
V
IN
3
2 V
OUT
+
+
1.25V
CURRENT
LIMIT
THERMAL
SHUTDOWN
1 Gnd
Figure 2 - Simplified block diagram of the IRU1010-18.
Rev. 1.4
3/14/2005
www.irf.com
3
IRU1010-18 & (PbF)
(D) TO-252 Package
2-Pin
A
C
B
K
L
M
45
8
D
E
O
J
7
8
N
Q
R
P
F
H
G
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
5.004
0.686
7.417
9.703
0.635
2.286
MAX
6.731
5.207
0.838
8.179
10.084
0.889
BSC
C
L
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
0.102
0
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
3/14/2005
IRU1010-18 & (PbF)
(P) Ultra Thin-Pak
TM
2-Pin
A
A1
K
V
B
H
M
L
P
G
G1
C
C
L
SYMBOL
A
A1
B
C
D
E
G
G1
H
K
L
M
N
P
R
U
V
MAX
MIN
6.17
5.91
5.79
5.54
6.27
6.02
2.03
1.70
0.79
0.63
0.33
0.17
2.41
2.16
4.70
4.45
9.68
9.42
1.27
0.76
0.13
0.02
1.14
0.89
0.25
0.25
1.19
0.94
68
28
3.30
2.92
5.08 NOM
E
U
D
N
R
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 1.4
3/14/2005
www.irf.com
5
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