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PDF IRU1150PBF Data sheet ( Hoja de datos )
| Número de pieza | IRU1150PBF | |
| Descripción | 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR | |
| Fabricantes | International Rectifier | |
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Data Sheet No. PD94129 revA
IRU1150(PbF)
FEATURES
0.7V Dropout at 4A
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 Chip Set
4A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
The IRU1150 is a 4A regulator with extremely low drop-
out voltage using a proprietary bipolar process that
achieves comparable equivalent on-resistance to that of
discrete MOSFETs. This product is specifically designed
to provide well regulated supply for applications requir-
ing 2.8V or lower voltages from 3.3V ATX power supplies
where high efficiency of a switcher can be achieved with-
out the cost and complexity associated with switching
regulators. One such application is the new graphic chip
sets that require anywhere from 2.4V to 2.7V supply
such as the Intel I740 chip set.
TYPICAL APPLICATION
3.3V
C1
100uF
VIN 5
IRU1150
VCTRL 4
VOUT 3
Adj 2
VSENSE 1
2.7V
R1
102
C3
R2 100uF
118
5V
C2
100uF
Figure 1 - Typical application of IRU1150 in a 3.3V to 2.7V for I740 chip.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 125
Basic Part (Non-Lead Free)
5-PIN PLASTIC
TO-263 (M)
IRU1150CM
5-PIN PLASTIC
Ultra Thin-PakTM (P)
IRU1150CP
8-PIN PLASTIC
SOIC (S)
IRU1150CS
TJ (°C)
0 To 125
Leadfree Part
5-PIN PLASTIC
TO-263 (M)
Not available
5-PIN PLASTIC 8-PIN PLASTIC
Ultra Thin-PakTM (P)
SOIC (S)
Not available IRU1150CSPbF
www.irf.com
1
1 page  
IRU1150(PbF)
Stability
The IRU1150 requires the use of an output capacitor as
part of the frequency compensation in order to make the
regulator stable. Typical designs for the microprocessor
applications use standard electrolytic capacitors with
typical ESR in the range of 50 to 100mΩ and an output
capacitance of 500 to 1000µF. Fortunately as the ca-
pacitance increases, the ESR decreases resulting in a
fixed RC time constant. The IRU1150 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.
Assuming, the following conditions:
VOUT = 2.7V
VIN = 3.3V
VCTRL = 5V
IOUT = 2A (DC Avg)
Calculate the maximum power dissipation using the fol-
lowing equation:
( )PD = IOUT×(VIN - VOUT)+
IOUT
60
×(VCTRL - VOUT)
( )PD = 2×(3.3 - 2.7)+
2
60
×(5 - 2.7) = 1.28W
Using table below select the proper package and the
amount of copper board needed.
Thermal Design
The IRU1150 incorporates an internal thermal shutdown
that protects the device when the junction temperature
exceeds the allowable maximum junction temperature.
Although this device can operate with junction tempera-
tures in the range of 150 C, it is recommended that the
selected heat sink be chosen such that during maxi-
mum continuous load operation the junction tempera-
ture is kept below this number. The example below
shows the steps in selecting the proper surface mount
package.
Pkg Copper θJA(°C/W)
Area
TO-263 1.4"X1.4" 25
TO-263 1.0"X1.0" 30
TO-263 0.7"X0.7" 35
TO-263 Pad Size 45
SO-8 1.0"X1.0" 55
Max Pd
(TA=25°C)
4.4W
3.7W
3.1W
2.4W
2.0W
Max Pd
(TA=45°C)
3.6W
3.0W
2.6W
2.0W
1.63W
Note: Above table is based on the maximum junction
temperature of 135 C.
As shown in the above table, any of the two packages
will do the job. For low cost applications the SOIC 8-pin
package is recommended.
www.irf.com
5
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