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IRU1175CM

P1-P3P4-P6P7-P8
IRU1175
1
Rev. 1.7
04/09/03
www.irf.com
7.5A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
The IRU1175 is a 7.5A regulator with extremely low drop-
out voltage using a proprietary bipolar process that
achieves comparable equivalent on resistance to that of
discrete MOSFETs. This product is specifically designed
to provide well regulated supply for applications requir-
ing very low dropout such as 2.8V from 3.3V ATX power
supplies where the same efficiency as the switcher can
be achieved without the cost and complexity associ-
ated with switching regulators. One such application is
the new graphic chip sets that require 2.7V supply such
as the Intel I740 chip set.
DESCRIPTION
0.5V Dropout at 7.5A (Equivalent of 67mV)
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
FEATURES
3.3V to 2.7V Intel I740 Chip Set
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
Figure 1 - Typical application of IRU1175.
Data Sheet No. PD94131
3.3V
IRU1175
2.7V
C1
100uF
C3
100uF
5V
C2
10uF
R1
100
1%
R2
124
1%
1
2
3
4
5
V
SENSE
Adj
V
OUT
V
CTRL
V
IN
TJ (°C) 5-PIN PLASTIC 5-PIN PLASTIC
TO-263 (M) Ultra Thin-Pak
TM
(P)
0 To 125 IRU1175CM IRU1175CP
2
Rev. 1.7
04/09/03
IRU1175
www.irf.com
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 6V
Control Input Voltage (VCTRL) ..................................... 14V
Power Dissipation ..................................................... Internally Limited
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 150°C
PACKAGE INFORMATION
5-PIN PLASTIC TO-263 (M) 5-PIN PLASTIC ULTRA THIN-PAK
TM
(P)
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF, and TJ=0 to 1258C.
Typical values refer to TJ=258C. VOUT=VSENSE.
uJA=35°C/W for 0.5" square pad uJA=35°C/W for 0.5" square pad
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
(VCTRL - VOUT)
Dropout Voltage (Note 2)
(VIN - VOUT)
Current Limit
Minimum Load Current (Note 3)
Thermal Regulation
Ripple Rejection
VCTRL=2.75, VIN=2V, Io=10mA,
TJ=258C, VADJ=0V
VCTRL=2.7 to 12V, VIN=2.05V to 5.5V,
Io=10mA to 7.5A, VADJ=0V
VCTRL=2.5V to 7V, VIN=1.75V to 5.5V,
Io=10mA, VADJ=0V
VCTRL=2.75V, VIN=2.1V,
Io=10mA to 7.5A, VADJ=0V
VADJ=0V for all conditions below:
VIN=2.05V, Io=1.5A
VIN=2.05V, Io=3A
VIN=2.05V, Io=5A
VIN=2.05V, Io=7.5A
VADJ=0V for all conditions below:
VCTRL=2.75V, Io=1.5A
VCTRL=2.75V, Io=3A
VCTRL=2.75V, Io=3A
VCTRL=2.75V, Io=7.5A
VCTRL=2.75V, VIN=2.05V,
DVo=100mV, VADJ=0V
VCTRL=5V, VIN=3.3V, VADJ=0V
30ms Pulse
VCTRL=5V, VIN=5V, Io=3A, VADJ=0V,
TJ=258C, VRIPPLE=1VPP at 120Hz
1.225
1.225
7.7
60
1.250
1.250
0.5
2
0.95
1.00
1.05
1.15
0.100
0.200
0.330
0.500
9
5
0.01
70
1.275
1.275
3
6
1.30
0.130
0.260
0.430
0.650
10
0.02
V
mV
mV
V
V
A
mA
%/W
dB
VREF
V
SENSE
Adj
V
OUT
V
CTRL
V
IN
1
2
3
4
5
V
SENSE
Adj
V
OUT
V
CTRL
V
IN
1
2
3
4
5
IRU1175
3
Rev. 1.7
04/09/03
www.irf.com
PIN DESCRIPTIONS
Note 1: Low duty cycle pulse testing with Kelvin con-
nections are required in order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum dif-
ferential between VIN and VOUT required to maintain regu-
lation 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.
This pin is the positive side of the reference which allows remote load sensing to achieve
excellent load regulation.
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.
This pin is the supply pin for the internal control circuitry as well as the base drive for the
pass transistor. This pin must always be higher than the VOUT pin in order for the device to
regulate. (See specifications)
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 higher than VOUT in
order for the device to regulate. (See specifications)
PIN # PIN SYMBOL PIN DESCRIPTION
1
2
3
4
5
VSENSE
Adj
VOUT
VCTRL
VIN
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Control Pin Current
Adjust Pin Current
VADJ=0V for all below conditions:
VCTRL=2.75V, VIN=2.05V, Io=1.5A
VCTRL=2.75V, VIN=2.05V, Io=3A
VCTRL=2.75V, VIN=2.05V, Io=5A
VCTRL=2.75V, VIN=2.05V, Io=7.5A
VCTRL=2.75V, VIN=2.05V, VADJ=0V
15
30
50
70
50 120
mA
mAIADJ
P1-P3P4-P6P7-P8

IRU1175CM

Mfr. #:
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Manufacturer:
Infineon Technologies
Description:
IC REG LIN POS ADJ 7.5A TO263-5
Lifecycle:
New from this manufacturer.
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