IRF IRU1030-33CT 3a low dropout positive fixed 3.3v regulator Datasheet

Data Sheet No. PD94125
IRU1030-33
3A LOW DROPOUT POSITIVE
FIXED 3.3V REGULATOR
DESCRIPTION
FEATURES
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
The IRU1030-33 is a low dropout three-terminal fixed 3.3V
output regulator with minimum of 3A output current capability. This product is specifically designed to provide
well regulated supply for low voltage IC applications requiring 3.3V output. The IRU1030-33 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.
APPLICATIONS
Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
5V
C1
330uF
IRU1030-33
Vin
3
Vout
2
Gnd
3.3V / 3A
C2
330uF
1
Figure 1 - Typical application of IRU1030-33
TYPICAL APPLICATION
Tj (°C)
0 To 150
Rev. 1.1
06/29/01
3-PIN PLASTIC
TO-220 (T)
IRU1030-33CT
3-PIN PLASTIC
TO-263 (M)
IRU1030-33CM
2-PIN PLASTIC
Ultra Thin-Pak (P)
IRU1030-33CP
2-PIN PLASTIC
TO-252 (D-Pak)
IRU1030-33CD
1
IRU1030-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) ....................................................
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)
3-PIN PLASTIC TO-263 (M)
2-PIN PLASTIC ULTRA THIN-PAK (P)
FRONT VIEW
FRONT VIEW
FRONT VIEW
3
Tab is
Vout
3
Vin
2
Vout
1
Gnd
θJT=2.7°C/W θJA=60°C/W
Tab is
Vout
2-PIN PLASTIC TO-252 (D-Pak)
Vin
2
Vout
1
Gnd
θJA=35°C/W for 1" Square pad
FRONT VIEW
3
Vin
3
Vin
1
Gnd
Tab is
Vout
Tab is
Vout
1
Gnd
θJA=70°C/W for 1" Square pad
θJA=70°C/W for 0.5" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cin=1µF, Cout=10µF, and Tj=0 to 150!C.
Typical values refer to Tj=25!C.
PARAMETER
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
SYM
Vo
∆Vo
TEST CONDITION
Io=10mA,Tj=25!C,Vin=5V
Io=10mA, Vin=5V
Io=10mA, 4.7V<Vin<7V
Vin=5V, Vadj=0, 10mA<Io<3A
Note 2, Io=3A
Vin=5V, dVo=100mV
Vin=5V
30ms Pulse, Vin-Vo=3V, Io=3A
f=120Hz, Co=25µF Tantalum,
Io=1.5A, Vin-Vo=3V
Io=10mA, Vin-Vo=1.5V, Tj=25!C
Vin=5V, Vadj=0V,Io=10mA
Tj=125!C, 1000Hrs
Tj=25!C, 10Hz<f<10KHz
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 Vin and Vout required to maintain regulation at Vout. It is measured when the output
voltage drops 1% below its nominal value.
2
MIN
TYP
3.267 3.300
3.234 3.300
1.1
MAX
3.333
3.366
0.2
0.4
1.3
5
10
%
%
V
A
mA
0.01
0.02
%/W
3.1
60
70
0.2
0.5
0.3
0.003
5
1
UNITS
V
dB
µA
%
%
%Vo
Note 3: Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Typically the resistor
dividers are selected such that it automatically maintains this current.
Rev. 1.1
06/29/01
IRU1030-33
PIN DESCRIPTIONS
PIN #
1
PIN SYMBOL PIN DESCRIPTION
Gnd
This pin must be connected to ground plane using a low inductance short connection.
2
Vout
The output of the regulator. A minimum of 10µF capacitor must be connected from this pin
to ground to insure stability.
3
Vin
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 Vout
in order for the device to regulate properly.
BLOCK DIAGRAM
Vin 3
2 Vout
+
1.25V
+
CURRENT
LIMIT
THERMAL
SHUTDOWN
1030-33blk1-1.0
1 Gnd
Figure 2 - Simplified block diagram of the IRU1030-33
APPLICATION INFORMATION
Stability
The IRU1030-33 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 100mΩ and an output capacitance of 500 to 1000µF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed RC time constant. The IRU1030-33 takes advantage of this
phenomena in making the overall regulator loop stable. For most applications a minimum of 100µF 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.
Rev. 1.1
06/29/01
3
IRU1030-33
Notes
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
4
Rev. 1.1
06/29/01
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