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IRU1030CD

P1-P3P4-P6P7-P9P10-P11
IRU1030
1
Rev. 1.3
08/20/02
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU1030 is a low dropout three-terminal adjustable
regulator with minimum of 3A 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+ termina-
tion for Pentium Pro and Klamath processor appli-
cations. The IRU1030 is also well suited for other pro-
cessors such as Cyrix, AMD and Power PCappli-
cations. The IRU1030 is guaranteed to have <1.3V drop-
out 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.
3A 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.
TJ (°C) 2-PIN PLASTIC 3-PIN PLASTIC 3-PIN PLASTIC
TO-252 (D-Pak) TO-263 (M) TO-220 (T)
0 To 150 IRU1030CD IRU1030CM IRU1030CT
Data Sheet No. PD94124
Figure 1 - Typical Application of IRU1030 in a 5V to 3.3V regulator.
FEATURES
Guaranteed < 1.3V 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
PACKAGE ORDER INFORMATION
5V
3.3V / 3A
R1
121
R2
200
C1
1500uF
C2
1500uF
IRU1030
1
2
3
Adj
V
IN
V
OUT
2
Rev. 1.3
08/20/02
IRU1030
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) 3-PIN PLASTIC TO-220 (T)
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF, and TJ=0 to 1508C.
Typical values refer to TJ=258C.
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 this current is automati-
cally maintained.
Adj
V
IN
V
OUT
1
2
3
FRONT VIEW
Tab is
V
OUT
Adj
V
OUT
V
IN
1
2
3
FRONT VIEW
Tab is
V
OUT
Adj
Tab is
V
OUT
V
IN
1
3
FRONT VIEW
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
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
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<3A
Note 2, Io=3A
VIN=3.3V, DVo=100mV
VIN=3.3V, VADJ=0V
30ms Pulse, VIN-Vo=3V, Io=3A
f=120Hz, Co=25mF Tantalum,
Io=1.5A, 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
3.1
60
1.250
1.250
1.1
5
0.01
70
55
0.2
0.5
0.3
0.003
1.262
1.275
0.2
0.4
1.3
10
0.02
120
5
1
V
%
%
V
A
mA
%/W
dB
mA
mA
%
%
%VO
VREF
DVO
IADJ
θJA=70°C/W for 0.5" Square pad θJA=35°C/W for 1" Square pad θJT=2.7°C/W θJA=60°C/W
IRU1030
3
Rev. 1.3
08/20/02
www.irf.com
APPLICATION INFORMATION
Introduction
The IRU1030 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 5.5V. This regulator un-
like the first generation of the three-terminal regulators
such as LM117 that required 3V differential between the
input and the regulated output, only needs 1.3V differen-
tial to maintain output regulation. This is a key require-
ment for today’s microprocessors that need typically
3.3V supply and are often generated from the 5V sup-
ply. Another major requirement of these microproces-
sors such as the Intel P54C is the need to switch the
load current from zero to several amps in tens of nano-
seconds at the processor pins, which translates to an
approximately 300 to 500ns current step at the regula-
tor. 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 IRU1030 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.
BLOCK DIAGRAM
Figure 2 - Simplified block diagram of the IRU1030.
PIN DESCRIPTIONS
PIN # PIN SYMBOL PIN DESCRIPTION
A resistor divider from VOUT to Adj pin to ground sets the output voltage.
The output of the regulator. A minimum of 10µF 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.
1
2
3
Adj
VOUT
VIN
VIN 3
1 Adj
2 VOUT
THERMAL
SHUTDOWN
CURRENT
LIMIT
1.25V
+
+
P1-P3P4-P6P7-P9P10-P11

IRU1030CD

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IC REG LINEAR POS ADJ 3A DPAK
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