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IRU1050IORN/a11avai5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1050IRN/a2235avai5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR


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IRU1050
5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
International
OR Rectifier
FEATU RES
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-ln Thermal Shutdown
APPLICATIONS
Low Voltage Processor Applications such as:
P540”, P550”, Cyrix M2TM,
POWER PCTM, AM D
Data Sheet No. PD94126
IRU1050
5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
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
PentiumTM P54CTM ,P55CTM as well as GTL+ termination
for Pentium ProTM and KlamathTM processorapplications.
The IRU1050 is also well suited for other processors
such as CyrixTM, AMD and Power PCTM applications.
The IRU1050 is guaranteed to have <1.3V dropout at full
load current making it ideal to provide well regulated
EI GTL+ Termination outputs of 2.5V to 3.3V with 4.75V to 7V input supply.
PENTIUM PROTM , KLAMATHTM
EI Low Voltage Memory Termination Applications
EI Standard 3.3V Chip Set and Logic Applications
IYPICAL APPLICATION
51/Y--ctr-
1500uF
VIN E)-
(r) IRU1050 m2 - 3.38V / 5A
121 -tc2
R2 /\ 2x 1500uF
MI 1 205
Figure 1 - Typical Application of IRU1050 in a 5V to 3.38V regulator designed
to meet the Intel P540 TM processors.
Notes: Pentium P540, P550, 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
To (°C) 2-PIN PLASTIC 3-PlN PLASTIC 2-PIN PLASTIC 3-PIN PLASTIC
TO-252 (D-Pak) TO-263 (M) Ultra Thin-Pakm (P) TO-220 (T)
0 To 150 IRU1050CD lRU1050CM lRU1050CP |RU1050CT
Rev. 1.8
08/20/02
IRU1050
International
TOR Reciiiier_
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V m) ....................................................
Power Dissipation _....................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
Internally Limited
-65°C To 150°C
0°C To 150°C
PACKAGE INFORMATION
2-Pin Plastic TO-252 (D-Pak)
3-Pin Plastic TO-263 (M)
24% Plastic ULTRA THIN-PAKW' (H
3-Pin Plastic TO-220 (T)
Tab is
1 Ad j
9JA=70°CNV for 0.5" Sq pad
Tab is
0JA=35°CNV for 1" Square pad
FRONT VIEW
VIN 3 TI VIN
Tab is
VOUT 1
2 VOUT
Adj 1 Cl Adj
0JA=70°CNV for 1" Square pad
0JT=2.7°CNV 0JA=60°CNV
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cm=1pLF, Com=10pLF, and TJ=O to 150°C.
Typical values refer to TJ=25°C.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage VREF lo=10mA, TJ=25°C, Vm-Vo=1.5v 1.238 1.25 1.262 V
lo=10mA, VlN-V0=1.5 1.225 1.25 1.275
Line Regulation lo=10mA, 1.3V<(VlN-VO)<7V 0.2 %
Load Regulation (Note 1) V|N=3.3V, VADJ=0V, 10mADropout Voltage (Note 2) AVo Note 2, lo=4A 1.2 v
|o=5A 1.1 1.3
Current Limit V|N=3.3V, AVo=100mV 5.1 A
Minimum Load Current (Note 3) VIN=3.3V, VADJ=0V 5 10 mA
Thermal Regulation 30ms Pulse, VlN-V0=3V, lo=5A 0.01 0.02 %/W
Ripple Rejection f=120Hz, Co=25wF Tantalum,
lo=2.5A, VIN-V0=3V 60 70 dB
Adjust Pin Current IADJ lo=10mA, ViN-Vo=1.5V, TJ=25°C,
lo=10mA, VIN-V0=1.5V 55 120 wA
Adjust Pin Current Change lo=10mA, 1hN-Vo=1.5V, TJ=25°C 0.2 5 wA
Temperature Stability V|N=3.3V, VADJ=0V, |o=10mA 0.5 %
Long Term Stability TJ=125°C, 1000Hrs 0.3 1 %
RMS Output Noise TJ=25°C, 10HzNote I: 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-
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
tains this current.
tain regulation at Vom. It is measured when the output
voltage drops 1% below its nominal value.
dividers are selected such that it automatically main-

Rev. 1.8
08/20/02
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