Data Sheet No. PD94696
IRU1502-33
MICROPOWER 1A LOW DROPOUT
PMOS VOLTAGE REGULATOR
FEATURES
Stable with Ceramic Capacitor
Small, Space Saving MLPM 6-Pin Package
Guaranteed < 1V Dropout at Full Load Current
Fast Transient Response
Ultra-Low Ground Current
Output Current Limiting
Built-In Thermal Shutdown
DESCRIPTION
The IRU1502-33 is a PMOS low dropout, linear regulator
and it is capable of supplying 1A of continuous current
over line and temperature range. The IRU1502-33 is
stable with low value ceramic capacitors, ensures low
noise operation, improves load transient response and
enables a smaller circuit size.
IRU1502-33 features ultra low noise, fast start-up and
an excellent time and load response. This device also
includes built-in output protection with both current limit
and thermal shutdown.
APPLICATIONS
High Efficiency Linear Regulator
Hard Disk Drivers, CD-ROMs, DVDs
ADSL and Cable Modems
TYPICAL APPLICATION
1
NC
Gnd
V
IN
NC
V
OUT
6
5V
C1
4.7uF
X5R
3.3V
C2
4.7uF
X5R
IRU1502-33
2
5
3
NC
4
Figure 1 - Typical application of IRU1502-33.
PACKAGE ORDER INFORMATION
T
J
(°C)
0 To 125
DEVICE
IRU1502-33CH
PACKAGE
6-Pin MLPM 3x3 (H)
MARKING
1502
Rev. 1.0
07/17/03
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1
IRU1502-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) .................................................... 6V
Operating Ambient Temperature Range ..................... -40°C To 125°C
Storage Temperature Range ...................................... -65°C To 150°C
CAUTION:
Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
6-PIN MLPM 3x3 (H)
TOP VIEW
NC
Gnd
NC
1
6
*u
JA
=428C/W
u
JC
=2.38C/W
V
IN
NC
V
OUT
*Exposed Pad on
underside is connected
to a typical 1" square
copper pad (typically
ground) through vias
for a 4-layer PCB board
design.
2
Pad
5
3
4
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over V
IN
=4.5V to 5.5V, I
OUT
=2mA to 1A, C
IN
=10mF, C
OUT
=10mF,
08C<T
J
<1258C and Note 1 and 6.
PARAMETER
Output Voltage 3.3V
SYM
V
O(3.3)
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Minimum Output Current
Temperature Stability
RMS Output Noise
Ripple Rejection
Thermal Shutdown
Quiescent Current
Transient Response
Step Load Change (light load
to full load) Droop Voltage
Transient Response
Step Load Change (full load to
light load) Output Voltage
Transient Response
Change of V
OUT
with
Application of V
IN
Transient Response
Short Circuit Removal
Response
Reg
LINE
Reg
LOAD
V
D
I
S
I
O(MIN)
T
S
V
N
R
A
T
J(SD)
I
GND
DV
OUT
DI
OUT
DV
OUT
DI
OUT
DV
OUT
DV
IN
DV
OUT
DI
OUT
@
I
O=Short
TEST CONDITION
4.75V<V
IN
<5.25V, 5mA[I
O
[1A:
T
J
=258C
08C[T
J
[1258C
4.75V<V
IN
<5.25V, I
O
=5mA
V
IN
=4.75V, 10mA[I
O
[1A
V
IN
=4V, I
O
=1A
V
IN
=3.8V, I
O
=0.8A, Note 2
V
IN
=5.5V
Note 3
Note 4, 5
10Hz<BW<10KHz, Note 5
V
IN
=5V, f=120Hz, Note 5
V
IN
=4.75V, 5mA[I
O
[1A,
Note 5
V
IN
[5.5V,
2mA[I
O
[1A
V
IN
=5V, Any 200mA step
from 100mA to1A, t
r
/1ms,
Note 5
V
IN
=5V, 1A to 10mA, t
f
/1ms,
Note 5
MIN
3.234
3.2175
TYP
3.3
3.3
MAX
3.366
3.3825
15
100
3.3825
3.3825
2
UNITS
V
mV
mV
V
A
mA
%
%Vo
dB
8C
mA
%
3
3
1
1.4
0.5
0.003
55
650
5
45
135
3.6
V
0 to 5V step input, t
r
/1ms,
10mA[I
O
[1A
Note 5
V
IN
=5V, I
O
=I
SHORT
to I
O
=10mA
Note 5
3.6
V
3.6
V
2
www.irf.com
Rev. 1.0
07/17/03
IRU1502-33
Note 1:
Low duty cycle pulse testing with Kelvin con-
nections is required in order to maintain accurate data.
Note 2:
In general, Dropout voltage is defined as the
minimum differential voltage between V
IN
and V
OUT
re-
quired to maintain regulation at V
OUT
. In this specifica-
tion, it is the measured output voltage at specified con-
dition.
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.
Note 4:
Temperature stability is the change in output
from nominal over the operating temperature range.
Note 5:
Guaranteed by design, but not tested in produc-
tion.
Note 6:
All limits are guaranteed. All electrical charac-
teristics have temperature limits that are tested during
T
A
=258C at probing and tested at final production with
T
A
=1008C. All hot and cold limits are guaranteed by cor-
relating the electrical characteristics to process and tem-
perature variations.
PIN DESCRIPTIONS
PIN #
1,3,5
2
4
6
PIN SYMBOL
NC
Gnd
V
OUT
V
IN
PIN DESCRIPTION
No connection.
Ground pin.
The output of the regulator. A minimum of 4.7mF output capacitance must be connected
from this pin to ground to insure stability.
The power input pin of the regulator. A minimum of input capacitance must be 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 higher than
the V
OUT
pin by the amount of dropout voltage (see electrical specification) in order for the
device to regulate properly.
BLOCK DIAGRAM
V
IN
6
Over
Current
Protection
Thermal
Shutdown
4 V
OUT
Control
Logic
V
IN
V
R E F
Gnd 2
Figure 2 - Simplified block diagram of the IRU1502-33.
Rev. 1.0
07/17/03
www.irf.com
3
IRU1502-33
TYPICAL PERFORMANCE CHARACTERISTICS
Unless specified, the test data applies: T
A
=258C, C
IN
=4.7mF, C
OUT
=4.7mF ceramic and V
IN
=5V.
DV
Figure 3 - Step load response
from 2mA to 1A, tr/1ms.
Ch1: Output voltage, AC, 50mV/div
Ch4: Load Current, 0.5A/div
Figure 5 - Output short circuit operation.
DV
= 3.26V
Ch1: Output voltage, 1V/div
Ch4: Load Current, 1A/div
3.26V
Figure 4 - Step-up transient load response
from 2mA to 1A, tr<1ms.
Ch1: Output voltage, AC, 50mV/div
Ch4: Load Current, 0.5A/div
Figure 6 - Short circuit removal,
I
OUT
from short to 10mA.
Ch1 Peak: 3.26V
Ch1: Output voltage, 1V/div
Ch4: Load Current, 1A/div
4
www.irf.com
Rev. 1.0
07/17/03
IRU1502-33
TYPICAL PERFORMANCE CHARACTERISTICS
Unless specified, the test data applies: T
A
=258C, C
IN
=4.7mF, C
OUT
=4.7mF ceramic and V
IN
=5V.
Figure 7 - Start-up at I
OUT
=10mA.
Ch1: 5V input voltage, 2V/div
Ch2: 3.3V output voltage, 2V/div
Figure 9 - Input voltage transient response,
V
IN
from 0V to 5V, C
OUT
=10mF.
Ch2 Peak: 3.48V
Ch1: 5V input voltage, 2V/div
Ch2: 3.3V output voltage, 1V/div
Figure 8 - Start-up at I
OUT
=1A.
Ch1: 5V input voltage, 2V/div
Ch2: 3.3V output voltage, 2V/div
Figure 10 - Thermal shutdown removal response.
I
LOAD
= 10mA
Ch1 Peak: 3.44V
Ch1: Output voltage, 1V/div
Ch4: Load Current, 1A/div
Rev. 1.0
07/17/03
www.irf.com
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