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IRU1175
7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
International
IEER Rectifier
IRU1175
7.5A ULTRA LOW DROPOUT POSITIVE
FEATU RES
0.5V Dropout at 7.5A (Equivalent of 67mf2)
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-in Thermal Shutdown
APPLICATIONS
:1 3.3V to 2.7V Intel I740 chipset
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
DESCRIPTION
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 specfcally 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.
I YPICAL APPLICATION
33V "CCE-
Vin El--
m. EI-
IRU1 175 Vout E - - 2.7V
vsenseEl-- R2 f u
1175q3p1-1.0 T 7
5V r--".
i 10uF
Typical application of IRU1175
PACKAGE ORDER INFORMATION
Tl (°C) 5-PIN PLASTIC 5-PIN PLASTIC 8-PIN PLASTIC
TO-263 (M) ULTRA THIN-PAK (P SOIC (S)
0 TO 125 |RU1175CM |RU1175CP IRU1175CS
Rev. 1.2
11/29/99
IRU1175
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V in) _................................................ 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 ) 5-PIN PLASTIC ULTRA THIN-PAK (P)
TOP VIEW RONT .VIEW
van E E] Vout WI 5 :IVin
W1 E El V011 Vert 4 :Ich
Adj E E] Vout ' 3 :IVout
VsenseE . El VOL! Adi 2 SM]
Vsense 1 :leense
eJA=55OCIW for 1" Sq pad area 0JA=35°CNV for 0.5" square pad 0JA=35°CNV for 0.5" square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specfed, these specifcations apply over, Cin=1uF, Cout=10pF, and Tj=0 to 125°C. Typical
values refer to Tj=25°C. Vout=Vsense.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Vref Vctrl=2.75V, Vin=2V, lo=10mA 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
lo=10mA to 7.5A, Vadj=0V
Line Regulation Vctrl=2.5Vto7V, Vin=1.75Vt05.5V
lo=10mA , Vadj=0V 0.5 3 mV
Load Regulation (note 1) Vctrl=2.75V, Vin=2.1V, lo=10mA
to 7.5A, Vadj=0V 2 6 mV
Dropout Voltage (note 2) Vadj=0V for all conditions below.
(Vctrl - Vout) Vin=2.05V, lo=1.5A 0.95 v
Vin=2.05V, lo=3A 1.00
Vin=2.05V, lo=5A 1.05
Vin=2.05V, lo=7.5A 1.15 1.30
Dropout Voltage (note 2) Vadj=0V for all conditions below.
(Vin - Vout) Vctrl=2.75V, lo=1.5A 0.100 0.130 V
Vctrl=2.75V, lo=3A 0.200 0.260
Vctrl=2.75V, lo=5A 0.330 0.430
Vctrl=2.75V, lo=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 30mS Pulse 0.01 0.02 %/W
Ripple Rejection Vctrl=5V, Vin=5V, Io=3A,Vadj=0V 60 70 dB
Tj=25, Vripple=1Vpp at 120Hz
R . 1.2
2-80 (tlug
