International Rectifier IRU1075CM, IRU1075CT, IRU1075CP Datasheet
Data Sheet No. PD94128
IRU1075
7.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
FEATURES
1V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
APPLICATIONS
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
TYPICAL APPLICATION
5V
DESCRIPTION
The IRU1075 is a low dropout three-terminal adjustable
regulator with minimum of 7.5A output current capability. This product is specifically designed to provide well
regulated supply for low voltage IC applications such as
Pentium P54C, P55C as well as GTL+ termination for Pentium Pro and Klamath processor appli-
cations. The IRU1075 is also well suited for other pro-
cessors such as Cyrix, AMD and Power PC appli-
cations. The IRU1075 is guaranteed to have <1.2V dropout at full load current making it ideal to provide well
regulated outputs such as 3.3V with input supply voltage as low as 4.5V minimum.
C1
1500uF
Vin
3
Vou t
Adj
2
1
R1
121
R2
200
IRU1075
1075app1-1.0
Typical application of IRU1075 in a 5V to 3.3V 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.
3.3V
C2
2x 1500uF
PACKAGE ORDER INFORMATION
Tj (°C) 3-PIN PLASTIC 3-PIN PLASTIC 3-PIN PLASTIC
TO-220 (T) TO-263 (M) Ultra Thin-Pak (P)
0 To 150 IRU1075CT IRU1075CM IRU1075CP
Rev. 1.1
06/29/01
1
IRU1075
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
3-PIN PLASTIC TO-220 (T) 3-PIN PLASTIC TO-263 (M) 3-PIN PLASTIC ULTRA THIN-PAK (P)
FRONT VIEW
Tab is
Vou t
3
2
1
Vin
Vou t
Adj
Tab is
θJT=2.7°C/W θJA=60°C/W θJA=35°C/W for 1" Square pad θJA=35°C/W for 1" Square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cin=1µF, Cout=10µF, and Tj=0 to 150!C.
Typical values refer to Tj=25!C.
Vou t
FRONT VIEW
FRONT VIEW
3
Vin
2
Vou t
1
Adj
Tab is
Vou t
3
Vin
2
Vou t
1
Adj
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Vref Io=10mA, Tj=25!C, (Vin-Vo)=1.5V 1.238 1.250 1.262 V
Io=10mA, (Vin-Vo)=1.5V 1.225 1.250 1.275
Line Regulation Io=10mA, 1.3V<(Vin-Vo)<7V 0.2 %
Load Regulation (Note 1) Vin=3.3V, Vadj=0, 10mA<Io<7.5A 0.4 %
Dropout Voltage Io=7.5A 1.0 1.2 V
(Note 2) ∆Vo Io=4A 0.92 1.1
Current Limit Vin=3.3V, dVo=100mV 7.6 9 A
Minimum Load Current Vin=3.3V, Vadj=0V 5 10 mA
(Note 3)
Thermal Regulation 30ms Pulse, Vin-Vo=3V, Io=7.5A 0.02 %/W
Ripple Rejection f=120Hz, Co=25µF Tantalum,
Io=7.5A, Vin-Vo=3V 60 70 dB
Adjust Pin Current Iadj Io=10mA, Vin-Vo=1.5V, Tj=25!C,
Io=10mA, Vin-Vo=1.5V 55 120 µA
Adjust Pin Current Change Io=10mA, Vin-Vo=1.5V, Tj=25!C 0.2 5 µA
Temperature Stability Vin=3.3V, Vadj=0V, Io=10mA 0.5 %
Long Term Stability Tj=125!C, 1000Hrs 0.3 %
RMS Output Noise Tj=25!C, 10Hz<f<10KHz 0.003 %V
Note 1: Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data.
Note 3: Minimum load current is defined as the minimum current required at the output in order for the out-
put voltage to maintain regulation. Typically the resistor
Note 2: Dropout voltage is defined as the minimum differential voltage between Vin and Vout required to main-
dividers are selected such that it automatically main-
tains this current.
tain regulation at Vout. It is measured when the output
voltage drops 1% below its nominal value.
2
Rev. 1.1
06/29/01
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