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International Rectifier Electronic Components Datasheet

IRU1175 Datasheet

7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

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IRU1175
FEATURES
7.5A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
DESCRIPTION
0.5V Dropout at 7.5A (Equivalent of 67mΩ)
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-in Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 chipset
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 chipsets that requires 2.7V supply such
as the Intel I740 chipset.
TYPICAL APPLICATION
3.3V
C1
100uF
Vin 5
IRU1175
Vctrl 4
Vout 3
Adj 2
1175app1-1.0
5V
Vsense 1
C2
10uF
R1
100
1%
R2
124
1%
Typical application of IRU1175
2.7V
C3
100uF
PACKAGE ORDER INFORMATION
Tj (°C)
0 TO 125
5-PIN PLASTIC 5-PIN PLASTIC 8-PIN PLASTIC
TO-263 (M) ULTRA THIN-PAK (P) SOIC (S)
IRU1175CM
IRU1175CP
IRU1175CS
Rev. 1.2
11/29/99
2-79


International Rectifier Electronic Components Datasheet

IRU1175 Datasheet

7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

No Preview Available !

IRU1175
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
8-PIN PLASTIC SOIC ( S )
5-PIN PLASTIC TO-263 ( M )
TOP VIEW
Vctrl 1
8 Vout
Vin 2
7 Vout
Adj 3
6 Vout
Vsense 4
5 Vout
FRONT VIEW
5
4
3
2
1
Vin
Vctrl
Vout
Adj
Vsense
θJA=55°C/W for 1" Sq pad area
θJA=35°C/W for 0.5" square pad
5-PIN PLASTIC ULTRA THIN-PAK (P)
FRONT VIEW
5
4
3
2
1
Vin
Vctrl
Vout
Adj
Vsense
θJA=35°C/W for 0.5" square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over, Cin=1µF, Cout=10µF, and Tj=0 to 125°C. Typical
values refer to Tj=25°C. Vout=Vsense.
PARAMETER
Reference Voltage
SYM TEST CONDITION
Vref Vctrl=2.75V, Vin=2V, Io=10mA
MIN TYP MAX UNITS
1.243 1.250 1.257
V
Tj=25, Vadj=0V
Vctrl=2.7to12V, Vin=2.05V to 5.5V, 1.237 1.250 1.263
Io=10mA to 7.5A, Vadj=0V
Line Regulation
Vctrl=2.5Vto7V, Vin=1.75Vto5.5V
Load Regulation (note 1)
Io=10mA , Vadj=0V
Vctrl=2.75V, Vin=2.1V, Io=10mA
0.5 3
mV
to 7.5A, Vadj=0V
26
mV
Dropout Voltage (note 2)
(Vctrl - Vout)
Vadj=0V for all conditions below.
Vin=2.05V, Io=1.5A
Vin=2.05V, Io=3A
0.95
1.00
V
Vin=2.05V, Io=5A
1.05
Dropout Voltage (note 2)
Vin=2.05V, Io=7.5A
Vadj=0V for all conditions below.
1.15 1.30
(Vin - Vout)
Vctrl=2.75V, Io=1.5A
Vctrl=2.75V, Io=3A
Vctrl=2.75V, Io=5A
0.100 0.130
0.200 0.260
0.330 0.430
V
Vctrl=2.75V, Io=7.5A
0.500 0.650
Current Limit
Vctrl=2.75V, Vin=2.05V,
dVo=100mV Vadj=0V
7.7 9
A
Minimum Load Current (note 3)
Vctrl=5V, Vin=3.3V, Vadj=0V
5 10 mA
Thermal Regulation
Ripple Rejection
30mS Pulse
Vctrl=5V, Vin=5V, Io=3A,Vadj=0V
60
0.01 0.02 %/W
70 dB
Tj=25, Vripple=1Vpp at 120Hz
2-80
Rev. 1.2
11/29/99


Part Number IRU1175
Description 7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
Maker International Rectifier
Total Page 6 Pages
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