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IRU1175CMIORN/a53avai7.5A Adj LDO Linear Regulator in a TO-263 5-Leads package
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IRU1175CM-IRU1175CMTR-IRU1175CP-IRU1175CPTR
7.5A Adj LDO Linear Regulator in a TO-263 5-Leads package
International
TOR Rectifier
Data Sheet No. PD94131
IRU1175
7.5A ULTRA LOW DROPOUT POSITIVE
FEATU RES
EI 0.5V Dropout at 7.5A (Equivalent of 67mm
EI Fast Transient Response
El 1% Voltage Reference Initial Accuracy
EI Built-ln Thermal Shutdown
APPLICATIONS
El 3.3V to 2.7V Intel I740 Chip Set
ADJUSTABLE REGULATOR
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 spetyTcally 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 efMiency 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 1740 chip set.
TYPICAL APPLICATION
3.3V +
w El--
VCTRL EI-
IRU1175 WUT E R1 - pr 2.7V
Adj T, 1300 i C3
VSENSE T- 'li, 1100‘":
5V >—I'+ T T
Figure 1 - Typical application of |RU1175.
PACKAGE ORDER INFORMATION
T.: (°C) 5-PIN PLASTIC 5-PIN PLASTIC
T0-263 (M) Ultra Thin-PakTM (P)
0 To 125 IRU1175CM IRU1175CP
Rev. 1.7 1
04/09/03
International
TOR Rectifier
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
5-PIN PLASTIC TO-263 (M) 5-PIN PLASTIC ULTRA THIN-PAK (P)
VIN 5 Cl VIN
berm 4 Cl VCTRL
VOUT 3 Cl VOUT
Adj 2 Cl Adj
VSENSE 1 Cl VSENSE
0JA=35°CIW for 0.5" square pad 0JA=35°CIW for 0.5" square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1}LF, Com=10pLF, and Teo to 125°C.
Typical values refer to TJ=25°C. VOUT=VSENSE.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage VREF VCTRL=2.75,VIN=2V, lo=10mA,
TJ=25°C, VADJ=0V 1.225 1.250 1.275 V
VCTRL=2.7 to 12V, VIN=2.05V to 5.5V,
lo=10mA to 7.5A, VADJ=0V 1.225 1.250 1.275
Line Regulation VCTRL=2.5V to 7V, Vm=1 .75V to 5.5V,
lo=10mA, VADJ=OV 0.5 3 mV
Load Regulation (Note 1) Vcrmr-2.75V, Vm=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
Vm=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=3A 0.330 0.430
VCTRL=2.75V, lo=7.5A 0.500 0.650
Current Limit Vcmur-2.75V, VIN=2.05V,
AVo=100mV, VADJ=OV 7.7 9 A
Minimum Load Current (Note 3) VCTRL=5V, Vm=3.3V, VADJ=OV 5 10 mA
Thermal Regulation 30ms Pulse 0.01 0.02 %/W
Ripple Rejection VCTRL=5V, VIN=5V, lo=3A, VADJ=OV,
TJ=25°C, VRlPPLE=1VPP at 120Hz 60 70 dB
2 Rev. 1.7
04/09/03
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