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PDF IRU1260CM Data sheet ( Hoja de datos )
| Número de pieza | IRU1260CM | |
| Descripción | DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Data Sheet No. PD94138
IRU1260
DUAL 6A AND 1A LOW DROPOUT
POSITIVE ADJUSTABLE REGULATOR
FEATURES
Guaranteed <1.3V Dropout at 6A (Output #2)
Guaranteed <0.6V Dropout at 1A (Output #1)
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
Providing a Single Package Solution for GTL+ and
High Speed Bus Termination
Dual Supply P55C™ Applications
DESCRIPTION
The IRU1260 uses a proprietary process and combines
a dual low dropout adjustable output regulator in a single
package with one output having a minimum of 6A and
the other one having a 1A output current capability. This
product is specifically designed to provide well regulated
supplies for low voltage ICs such as 3.3V to 1.5V and
2.5V supplies for the GTL+ termination and the new
clock for Pentium IITM applications. Other applications
include low cost dual supply for processors such as Intel
P55CTM where 2.8V and 3.3V are needed for the Core
and the I/O supplies from the 5V input.
TYPICAL APPLICATION
3.3V
C1
VOUT1 7
VIN 6
U1 VOUT2 5
IRU1260 Gnd 4
VFB2 3
VFB1 2
VCTRL 1
C4
R5
C5
R1
R2
R3
R4
2.5V / 1A
C2
1.5V / 6A
C3
5V
Figure 1 - Typical application of IRU1260 in the Pentium IITM design with the 1.5V output
providing for GTL+ termination while 2.5V supplies the clock chip.
Notes: Pentium IITM is trademark of Intel Corp.
P55CTM is trademark of Intel Corp.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 150
7-PIN PLASTIC
TO-263 (M)
IRU1260CM
7-PIN PLASTIC
Ultra Thin-PakTM (P)
IRU1260CP
Rev. 2.1
09/19/02
www.irf.com
1
1 page  
IRU1260
Stability
The IRU1260 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 100mV and the output
capacitance of 500 to 1000mF. Fortunately as the ca-
pacitance increases, the ESR decreases resulting in a
fixed RC time constant. The IRU1260 takes advantage
of this phenomena in making the overall regulator loop
stable. For most applications a minimum of 100mF alu-
minum electrolytic capacitor with the maximum ESR of
0.3V such as Sanyo, MVGX series, Panasonic FA se-
ries as well as the Nichicon PL series insures both sta-
bility and good transient response. The IRU1260 also
requires a 1mF ceramic capacitor connected from VIN to
VCTRL and a 10V, 0.1W resistor in series with VCTRL pin
in order to further insure stability.
Thermal Design
The IRU1260 incorporates an internal thermal shutdown
that protects the device when the junction temperature
exceeds the maximum allowable junction temperature.
Although this device can operate with junction tempera-
tures in the range of 1508C, 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 given shows
the steps in selecting the proper regulator heat sink for
driving the Pentium IITM processor GTL+ termination
resistors and the Clock IC using the IRU1260 TO-263
package.
Example:
Assuming the following specifications:
VIN = 3.3V
VOUT1 = 2.5V
VOUT2 = 1.5V
IOUT1(MAX) = 0.2A
IOUT2(MAX) = 1.5A
TA = 358C
The steps for selecting a proper heat sink to keep the
junction temperature below 1358C is given as:
1) Calculate the maximum power dissipation using:
PD = IOUT13(VIN - VOUT1) + IOUT23(VIN - VOUT2)
PD = 0.23(3.3 - 2.5) + 1.53(3.3 - 1.5) = 2.86W
2) Assuming a TO-263 surface mount package, the junc-
tion to ambient thermal resistance of the package is:
uJA = 308C/W for 1" square pad area
3) The maximum junction temperature of the device is
calculated using the equation below:
TJ = TA + PD3uJA
TJ = 35 + 2.86330 = 1218C
Since this is lower than our selected 1358C maxi-
mum junction temperature (1508C is the thermal shut-
down of the device), TO-263 package is a suitable
package for our application.
Rev. 2.1
09/19/02
www.irf.com
5
5 Page 
A
A1
G
CL
(P) Ultra Thin-PakTM
7-Pin
K
BH
D
C
E
M
L
P
V
N
R
SYMBOL
A
A1
B
C
D
E
G
H
K
L
M
N
P
R
U
V
MIN MAX
9.27 9.52
8.89 9.14
7.87 8.13
1.78 2.03
0.63 0.79
0.25 NOM
1.27
10.41 10.67
0.76 1.27
0.03 0.13
0.89 1.14
0.25
0.79 1.04
38 68
5.59 NOM
7.49 NOM
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
IRU1260
U
Rev. 2.1
09/19/02
www.irf.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet IRU1260CM.PDF ] | |
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