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IRU1075CP

P1-P3P4-P6P7-P9
IRU1075
1
Rev. 1.2
08/01/02
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU1075 is a low dropout three-terminal adjustable
regulator with minimum of 7.5A output current capabil-
ity. This product is specifically designed to provide well
regulated supply for low voltage IC applications such as
Pentium P54C, P55C as well as GTL+ termina-
tion for Pentium Pro and Klamath processor appli-
cations. The IRU1075 is also well suited for other pro-
cessors such as Cyrix, AMD and Power PCappli-
cations. The IRU1075 is guaranteed to have <1.2V drop-
out at full load current making it ideal to provide well
regulated outputs such as 3.3V with input supply volt-
age as low as 4.5V minimum.
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
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.
TJ (°C) 3-PIN PLASTIC 3-PIN PLASTIC 3-PIN PLASTIC
TO-220 (T) TO-263 (M) Ultra Thin-Pak
TM
(P)
0 To 150 IRU1075CT IRU1075CM IRU1075CP
7.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
Data Sheet No. PD94128
PACKAGE ORDER INFORMATION
Typical application of IRU1075 in a 5V to 3.3V regulator.
FEATURES
APPLICATIONS
1V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
5V
3.3V
R1
121
R2
200
C1
1500uF
C2
2x 1500uF
IRU1075
1
2
3
Adj
V
IN
V
OUT
2
Rev. 1.2
08/01/02
IRU1075
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
3-PIN PLASTIC TO-220 (T) 3-PIN PLASTIC TO-263 (M) 3-PIN PLASTIC ULTRA THIN-PAK
TM
(P)
ELECTRICAL SPECIFICATIONS
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.
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF, and TJ=0 to 1508C.
Typical values refer to TJ=258C.
Adj
Tab is
VOUT
VIN
VOUT
1
2
3
FRONT VIEW
Adj
VOUT
VIN
1
2
3
FRONT VIEW
Tab is
VOUT
Adj
V OUT
V IN
FRONT VIEW
1
3
2
Tab is
V OUT
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
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)=1.5V
Io=10mA, 1.3V<(VIN-Vo)<7V
VIN=3.3V, VADJ=0, 10mA<Io<7.5A
Io=7.5A
Io=4A
VIN=3.3V, DVo=100mV
VIN=3.3V, VADJ=0V
30ms Pulse, VIN-Vo=3V, Io=7.5A
f=120Hz, Co=25mF Tantalum,
Io=7.5A, 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
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
1.238
1.225
7.6
60
1.250
1.250
0.4
1.0
0.92
9
5
0.02
70
55
0.2
0.5
0.3
0.003
1.262
1.275
0.2
1.2
1.1
10
120
5
V
%
%
V
A
mA
%/W
dB
mA
mA
%
%
%VO
VREF
DVO
IADJ
IRU1075
3
Rev. 1.2
08/01/02
www.irf.com
APPLICATION INFORMATION
Introduction
The IRU1075 adjustable Low Dropout (LDO) regulator
is a three-terminal device which can easily be pro-
grammed with the addition of two external resistors to
any voltages within the range of 1.25 to 5.5 V. This regu-
lator unlike the first generation of the three-terminal regu-
lators such as LM117 that required 3V differential be-
tween the input and the regulated output, only needs
1.3V differential to maintain output regulation. This is a
key requirement for today’s microprocessors that need
typically 3.3V supply and are often generated from the
5V supply. Another major requirement of these micro-
processors 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 IRU1075 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 # PIN SYMBOL PIN DESCRIPTION
BLOCK DIAGRAM
PIN DESCRIPTIONS
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.
Figure 2 - Simplified block diagram of the IRU1075.
1
2
3
Adj
VOUT
VIN
VIN 3
1 Adj
2 VOUT
THERMAL
SHUTDOWN
CURRENT
LIMIT
1.25V
+
+
P1-P3P4-P6P7-P9

IRU1075CP

Mfr. #:
Buy IRU1075CP
Manufacturer:
Infineon Technologies
Description:
IC REG PENTIUM 1OUT 3UTHINPAK
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