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IRU1261CMTR

P1-P3P4-P6P7-P8
IRU1261
1
Rev. 2.0
09/19/02
www.irf.com
PACKAGE ORDER INFORMATION
TYPICAL APPLICATION
DESCRIPTION
The IRU1261, using a proprietary process, combines a
dual low dropout regulator with fixed outputs of 1.5V and
2.5V in a single package with the 1.5V output having a
minimum of 6A and the 2.5V having a 1A output current
capability. This product is specifically designed to pro-
vide well regulated supplies from 3.3V to generate 1.5V
for GTL+ termination resistor supply and 2.5V clock
supply for the new generation of the Pentium II
TM
pro-
cessor applications.
DUAL 6A AND 1A LOW DROPOUT
POSITIVE FIXED 1.5V AND 2.5V REGULATOR
Figure 1 - Typical application of IRU1261 in a Pentium II
TM
processor application.
Note: Pentium II
TM
is trademark of Intel Corp.
TJ (°C) 5-PIN PLASTIC 5-PIN PLASTIC
TO-263 (M) Ultra Thin-Pak
TM
(P)
0 To 150 IRU1261CM IRU1261CP
Data Sheet No. PD94139
Pentium II
TM
Processor Applications
FEATURES
Guaranteed to Provide 1.5V and 2.5V Supplies
with 3.1V Input
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
3.3V
2.5V / 1A
IRU1261
1.5V / 6A
C1
C3
C4
5V
C2
R1
1
2
3
4
5
V
CTRL
V
OUT
2
Gnd
V
IN
V
OUT
1
IRU1261
2
Rev. 2.0
09/19/02
www.irf.com
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. Typically the resistor
dividers are selected such that it automatically main-
tains this current.
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 7V
Power Dissipation ..................................................... Internally Limited
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 150°C
PACKAGE INFORMATION
5-PIN PLASTIC TO-263 (M) 5-PIN ULTRA THIN-PAK
TM
(P)
Note 1: Low duty cycle pulse testing with Kelvin con-
nections is required in order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum dif-
ferential voltage between VIN and VOUT required to main-
tain regulation at VOUT. It is measured when the output
voltage drops 1% below its nominal value.
ELECTRICAL SPECIFICATIONS
θJA=308C/W for 1"sq pad θJA=308C/W for 1"sq pad
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=100mF and TJ=0 to 1508C. Typical
values refer to TJ=258C. IFL=6A for output #2 and 1A for output #1. VCTRL=5V, VIN=3.3V.
VCTRL Input Voltage
Output Voltage #2
Output Voltage #1
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Output #2)
Dropout Voltage (Output #1)
Current Limit (Output #2)
Current Limit (Output #1)
Minimum Load Current
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
3.0
1.485
1.470
2.462
2.425
6.1
1.1
V
V
V
%
%
V
V
A
A
mA
%/W
dB
%
%
%VO
1.515
1.530
2.537
2.575
1.3
0.6
10
0.02
1.500
1.500
2.500
2.500
0.2
0.4
0.4
5
0.01
70
0.5
0.3
0.003
VO2
VO1
Io=10mA, TJ=25°C
Io=10mA
Io=10mA, TJ=25°C
Io=10mA
Io=10mA, 3.1V<VIN<3.6V
10mA<Io<IFL
Note 2, Io=6A, VCTRL=4.75V
Note 2, Io=1A, VCTRL=4.75V
DVo=100mV
DVo=100mV
Note 3
30ms Pulse, Io=IFL
f=120Hz, Co=25mF Tantalum,
Io=0.5 3 IFL
Io=10mA
TJ=1258C, 1000Hrs
10Hz<f<10KHz
VCTRL
Gnd
VOUT 2
VIN
VOUT 1
1
2
3
4
5
VCTRL
Gnd
VOUT 2
VIN
VOUT 1
1
2
3
4
5
IRU1261
3
Rev. 2.0
09/19/02
www.irf.com
BLOCK DIAGRAM
The control input pin of the regulator. This pin is connected, via a 10V resistor, to the 5V
supply to provide the base current for the pass transistor of both regulators. This allows
the regulator to have very low dropout voltage which allows one to generate a well regu-
lated 2.5V supply from the 3.3V input. A high frequency, 1mF capacitor is connected
between this pin and VIN pin to insure stability.
The output #2 (high current) of the regulator. A minimum of 100mF capacitor must be
connected from this pin to ground to insure stability.
This pin is connected to ground. It is also the Tab of the package.
The power 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 higher than both
VOUT pins by the amount of the dropout voltage (see data sheet) in order for the device to
regulate properly.
The output #1 (low current) of the regulator. A minimum of 100mF capacitor must be
connected from this pin to ground to insure stability.
Figure 2 - Simplified block diagram of the IRU1261.
VCTRL
VOUT2
Gnd
VIN
VOUT1
1
2
3
4
5
PIN DESCRIPTIONS
PIN # PIN SYMBOL PIN DESCRIPTION
V
CTRL
V
IN
Gnd
4
1
3
2 V
OUT
2
5 V
OUT
1
THERMAL
SHUTDOWN
1.20V
+
P1-P3P4-P6P7-P8

IRU1261CMTR

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Buy IRU1261CMTR
Manufacturer:
Infineon Technologies
Description:
IC REG CONV PENTIUM 2OUT TO263-5
Lifecycle:
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