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IRU1176CPTR

P1-P3P4-P6P7-P8
IRU1176
1
Rev. 1.5
07/16/02
www.irf.com
7.5A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT
The IRU1176 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. The IRU1176 also provides a conve-
nient shutdown pin that allows the regulator to be shut-
down and reduce the input current consumption. Unlike
the PNP type regulators this device does not have high
quiescent current during the start up mode making it
ideal for applications where there is limited current ca-
pability such operation from the 5V standby supply of
the computer power supply. One application is the new
generation of RDRAM memory that needs to provide 2.5V
from 3.3V input and be able to operate from 5VSB as
well.
DESCRIPTION
Guaranteed <0.65V Dropout at 7.5A
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
TJ (°C) 7-PIN PLASTIC 7-PIN PLASTIC
TO-263 (M) Ultra Thin-Pak
TM
(P)
0 To 125 IRU1176CM IRU1176CP
PACKAGE ORDER INFORMATION
Figure 1 - Typical application of IRU1176.
Data Sheet No. PD94132
3.3V
IRU1176
2.7V
C1
C3
5V
C2
R1
R2
SD Enable
Q1
V
SENSE
SD
Adj
V
OUT
V
CTRL
V
IN
V
IN
1
2
3
4
5
6
7
2
Rev. 1.5
07/16/02
IRU1176
www.irf.com
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 7V
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
7-PIN PLASTIC TO-263 (M) 7-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.
VSENSE
SD
VOUT
VIN
VIN
Adj
VCTRL
FRONT VIEW
1
2
3
4
5
6
7
Tab is
VOUT
VSENSE
SD
VOUT
VIN
VIN
Adj
VCTRL
FRONT VIEW
1
2
3
4
5
6
7
Tab is
VOUT
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
SD Threshold Voltage
SD Input Current
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
VCTRL=2.75V, 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=4A
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=4A
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=4A, VADJ=0V,
TJ=258C, VRIPPLE=1VPP at 120Hz
VCTRL=5V, SD=0V
1.225
1.225
7.7
60
1.250
1.250
0.5
5
0.95
1.00
1.05
1.15
0.075
0.150
0.200
0.375
9
5
0.01
70
VCTRL-1.4
94
1.275
1.275
10
0.02
VCTRL-2.2
130
V
mV
mV
V
V
A
mA
%/W
dB
V
mA
θJA=35°C/W for 0.5" square pad θJA=35°C/W for 0.5" square pad
VREF
IRU1176
3
Rev. 1.5
07/16/02
www.irf.com
PIN DESCRIPTIONS
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 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.
When this pin is pulled lower than 1.4V with respect to the VCTRL pin the device is shut-
down. To enable the operation leave this pin open. Internal to device, there is a pull-up
resistor.
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 DESCRIPTIONS
1
2
3
4
5
6, 7
VSENSE
SD
Adj
VOUT
VCTRL
VIN
Control Pin Current
Adjust Pin Current
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
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=4A
VCTRL=2.75V, VIN=2.05V, Io=7.5A
VCTRL=2.75V, VIN=2.05V, VADJ=0V 50 120
mA
mA
IADJ
P1-P3P4-P6P7-P8

IRU1176CPTR

Mfr. #:
Buy IRU1176CPTR
Manufacturer:
Infineon Technologies
Description:
IC REG LIN POS ADJ 7-UTHINPAK
Lifecycle:
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