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IRU1015CT

P1-P3P4-P6P7-P9P10-P11
IRU1015
1
Rev. 1.3
08/20/02
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU1015 is a low dropout three-terminal adjustable
regulator with minimum of 1.5A output current capabil-
ity. This product is specifically designed to provide well
regulated supply for low voltage IC applications such as
486DX4 processor, P55CI/O supply as well as high
speed bus termination and low current 3.3V logic sup-
ply. The IRU1015 is also well suited for other applica-
tions such as VGA and sound card. The IRU1015 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.
1.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
Figure 1 - Typical application of IRU1015 in a 5V to 3.3V regulator.
T
J
(°C) 2-PIN PLASTIC 3-PIN PLASTIC 3-PIN PLASTIC
TO-252 (D-Pak) TO-263 (M) TO-220 (T)
0 To 150 IRU1015CD IRU1015CM IRU1015CT
Data Sheet No. PD94122
PACKAGE ORDER INFORMATION
Note: P55C is trademark of Intel Corp.
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
FEATURES
APPLICATIONS
486DX4 Supply Voltage
P55 I/O Supply Voltage
VGA & Sound Card Applications
Low Voltage High Speed Termination Applications
Standard 3.3V Chip Set and Logic Applications
C2
1500uF
5V
3.3V / 1.5A
R1
121
R2
200
C1
1500uF
IRU1015
1
2
3
Adj
V
IN
V
OUT
IRU1015
2
Rev. 1.3
08/20/02
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)
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 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
V
IN
V
OUT
1
2
3
FRONT VIEW
Tab is
V
OUT
Adj
V
IN
1
3
FRONT VIEW
Tab is
V
OUT
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
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
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<1.5A
Note 2, Io=1.5A
VIN=3.3V, DVo=100mV
VIN=3.3V, VADJ=0V
30ms Pulse, VIN-Vo=3V, Io=1.5A
f=120Hz, Co=25mF Tantalum,
Io=0.75A, 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
1.6
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
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.
Adj
Tab is
V
OUT
V
IN
1
3
FRONT VIEW
V
OUT
2
IRU1015
3
Rev. 1.3
08/20/02
www.irf.com
APPLICATION INFORMATION
Introduction
The IRU1015 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 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 is the need to switch the load current from zero to
full load in tens of nanoseconds at their pins, which
translates to an approximately 300 to 500ns current step
at the regulator. In addition, the output voltage toler-
ances are sometimes tight and they include the tran-
sient response as part of the specification.
The IRU1015 is specifically designed to meet the fast
current transient needs as well as provide an accurate
initial voltage, reducing the overall system cost with the
need for fewer output capacitors.
Figure 2 - Simplified block diagram of the IRU1015.
BLOCK DIAGRAM
PIN # PIN SYMBOL PIN DESCRIPTION
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.
1
2
3
Adj
VOUT
VIN
VIN 3
1 Adj
2 VOUT
THERMAL
SHUTDOWN
CURRENT
LIMIT
1.25V
+
+
P1-P3P4-P6P7-P9P10-P11

IRU1015CT

Mfr. #:
Buy IRU1015CT
Manufacturer:
Infineon Technologies
Description:
IC REG LIN POS ADJ 1.5A TO220AB
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