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IRU1050CP

P1-P3P4-P6P7-P9P10-P12
IRU1050
1
Rev. 1.8
08/20/02
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU1050 is a low dropout three-terminal adjustable
regulator with minimum of 5A output current capability.
This product is specifically designed to provide well regu-
lated supply for low voltage IC applications such as
Pentium P54C,P55C as well as GTL+ termination
for Pentium Pro and Klamath processor applications.
The IRU1050 is also well suited for other processors
such as Cyrix, AMD and Power PC applications.
The IRU1050 is guaranteed to have <1.3V dropout at full
load current making it ideal to provide well regulated
outputs of 2.5V to 3.3V with 4.75V to 7V input supply.
5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
Notes: Pentium P54C, P55C, Klamath, Pentium Pro,VRE are trademarks of Intel Corp. Cyrix M2 is trademark of Cyrix Corp.
Power PC is trademark of IBM Corp.
PACKAGE ORDER INFORMATION
TJ (°C) 2-PIN PLASTIC 3-PIN PLASTIC 2-PIN PLASTIC 3-PIN PLASTIC
TO-252 (D-Pak) TO-263 (M) Ultra Thin-Pak
TM
(P) TO-220 (T)
0 To 150 IRU1050CD IRU1050CM IRU1050CP IRU1050CT
Data Sheet No. PD94126
Figure 1 - Typical Application of IRU1050 in a 5V to 3.38V regulator designed
to meet the Intel P54C processors.
Low Voltage Processor Applications such as:
P54C, P55C, Cyrix M2,
POWER PC, AMD
GTL+ Termination
PENTIUM PRO, KLAMATH
Low Voltage Memory Termination Applications
Standard 3.3V Chip Set and Logic Applications
FEATURES
APPLICATIONS
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
5V
3.38V / 5A
R1
121
R2
205
C1
1500uF
C2
2x 1500uF
IRU1050
1
2
3
Adj
V
IN
V
OUT
2
Rev. 1.8
08/20/02
IRU1050
www.irf.com
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
2-Pin Plastic TO-252 (D-Pak) 3-Pin Plastic TO-263 (M) 2-Pin Plastic ULTRA THIN-PAK
TM
(P) 3-Pin Plastic TO-220 (T)
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF, and TJ=0 to 1508C.
Typical values refer to TJ=258C.
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.
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.
Adj
Tab is
V
OUT
V
IN
V
OUT
1
2
3
FRONT VIEW
Adj
VOUT
VIN
1
2
3
FRONT VIEW
Tab is
VOUT
Adj
VIN
FRONT VIEW
1
3
Tab is
VOUT
Adj
VIN
1
3
FRONT VIEW
Tab is
VOUT
θJA=70°C/W for 0.5" Sq pad θJA=35°C/W for 1" Square pad θJA=70°C/W for 1" Square pad θJT=2.7°C/W θJA=60°C/W
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
VREF
DVo
IADJ
Reference 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
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise
Io=10mA, TJ=258C, VIN-Vo=1.5V
Io=10mA, VIN-Vo=1.5
Io=10mA, 1.3V<(VIN-Vo)<7V
VIN=3.3V, VADJ=0V, 10mA<Io<5A
Note 2, Io=4A
Io=5A
VIN=3.3V, DVo=100mV
VIN=3.3V, VADJ=0V
30ms Pulse, VIN-Vo=3V, Io=5A
f=120Hz, Co=25mF Tantalum,
Io=2.5A, VIN-Vo=3V
Io=10mA, VIN-Vo=1.5V, TJ=258C,
Io=10mA, VIN-Vo=1.5V
Io=10mA, VIN-Vo=1.5V, TJ=258C
VIN=3.3V, VADJ=0V, Io=10mA
TJ=1258C, 1000Hrs
TJ=258C, 10Hz<f<10KHz
1.238
1.225
5.1
60
1.25
1.25
1.1
5
0.01
70
55
0.2
0.5
0.3
0.003
1.262
1.275
0.2
0.4
1.2
1.3
10
0.02
120
5
1
V
%
%
V
A
mA
%/W
dB
mA
mA
%
%
%Vo
IRU1050
3
Rev. 1.8
08/20/02
www.irf.com
Introduction
The IRU1050 adjustable Low Dropout (LDO) regulator is
a three-terminal device which can easily be programmed
with the addition of two external resistors to any volt-
ages within the range of 1.25 to 5.5 V. This regulator
unlike the first generation of the three-terminal regula-
tors such as LM117 that required 3V differential between
the input and the regulated output, only needs 1.3V dif-
ferential to maintain output regulation. This is a key re-
quirement for today’s microprocessors that need typi-
cally 3.3V supply and are often generated from the 5V
supply. Another major requirement of these micropro-
cessors such as the Intel P54C is the need to switch
the load current from zero to several amps in tens of
nanoseconds at the processor pins, which translates to
an approximately 300 to 500ns current step at the regu-
lator. In addition, the output voltage tolerances are also
extremely tight and they include the transient response
as part of the specification.For example Intel VRE
specification calls for a total of ±100mV including initial
tolerance, load regulation and 0 to 4.6A load step.
The IRU1050 is specifically designed to meet the fast
current transient needs as well as providing an accurate
initial voltage, reducing the overall system cost with the
need for fewer output capacitors.
PIN DESCRIPTIONS
PIN # PIN SYMBOL PIN DESCRIPTION
Figure 2 - Simplified block diagram of the IRU1050.
A resistor divider from this pin to the VOUT pin and ground sets the output voltage.
The output of the regulator. A minimum of 10mF capacitor must be connected from this pin
to ground to insure stability.
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
1
2
3
Adj
VOUT
VIN
VIN 3
1 Adj
2 VOUT
THERMAL
SHUTDOWN
CURRENT
LIMIT
1.25V
+
+
APPLICATION INFORMATION
P1-P3P4-P6P7-P9P10-P12

IRU1050CP

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Manufacturer:
Infineon Technologies
Description:
IC REG LIN POS ADJ 5A 2-UTHINPAK
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