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Details, datasheet, quote on part number:IRU1176CM
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Datasheet text preview:
Data Sheet No. PD94132
IRU1176
7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT DESCRIPTION
The IRU1176 is a 7.5A regulator with extremely low dropout voltage using a proprietary Bipolar process that achieves comparable equivalent on resistance to that of discrete MOSFETs. The IRU1176 also provides a convenient shutdown pin that allows the regulator to be shutdown 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 capability 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.
FEATURES
Guaranteed <0.65V Dropout at 7.5A Fast Transient Response 1% Voltage Reference Initial Accuracy Built-In Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 Chip Set
TYPICAL APPLICATION
3.3V
C1
VIN VIN VCTRL
7 6 5 4 3 2 1
R2 R1 C3
IRU1176
VOUT Adj SD VSENSE
2.7V
5V
C2 Q1
SD
Enable
Figure 1 - Typical application of IRU1176.
PACKAGE ORDER INFORMATION
TJ (°C) 0 To 125 7-PIN PLASTIC TO-263 (M) IRU1176CM 7-PIN PLASTIC Ultra Thin-PakTM (P) IRU1176CP
Rev. 1.5 07/16/02
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IRU1176
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .... Control Input Voltage (VCTRL) .... Power Dissipation ..... Storage Temperature Range ..... Operating Junction Temperature Range ............ 7V 14V Internally Limited -65°C To 150°C 0°C To 150°C
PACKAGE INFORMATION
7-PIN PLASTIC TO-263 (M)
FRONT VIEW 7 6 5 4 3 2 1
7-PIN PLASTIC ULTRA THIN-PAK T M (P)
FRONT VIEW 7 6 5 4 3 2 1
Tab is V OUT
V IN V IN V CTRL V OUT Adj SD V SENSE
Tab is V OUT
V IN V IN V CTRL V OUT Adj SD V SENSE
JA=35°C/W for 0.5" square pad
JA=35°C/W for 0.5" square pad
ELECTRICAL SPECIFICATIONS
PARAMETER Reference Voltage SYM VREF
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF and TJ=0 to 1258C. Typical values refer to TJ=258C. VOUT=VSENSE. TEST CONDITION VCTRL=2.75V, VIN=2V, Io=10mA, TJ=258C, VADJ=0V
VCTRL=2.7 to 12V, VIN=2.05V to 5.5V,
MIN 1.225 1.225
TYP 1.250 1.250 0.5 5 0.95 1.00 1.05 1.15 0.075 0.150 0.200 0.375
MAX 1.275 1.275
UNITS V
Io=10mA to 7.5A, VADJ=0V Line Regulation Load Regulation (Note 1) Dropout Voltage (Note 2) (V CTRL - VOUT)
VCTRL=2.5V to 7V, VIN=1.75V to 5.5V,
Dropout Voltage (Note 2) (V IN - VOUT)
Current Limit Minimum Load Current (Note 3) Thermal Regulation Ripple Rejection SD Threshold Voltage SD Input Current
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, D Vo=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 www.irf.com
mV mV V
V
7.7
9 5 0.01 70
10 0.02
A mA %/W dB V mA
Rev. 1.5 07/16/02
60
V CTRL-1.4 V CTRL-2.2
94
130
2
IRU1176
PARAMETER Control Pin Current SYM TEST CONDITION 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 MIN TYP MAX UNITS mA
Adjust Pin Current
IADJ
50
120
mA
Note 1: Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data. Note 2: Dropout voltage is defined as the minimum differential between VIN and VOUT required to maintain regulation at VOUT. It is measured when the output voltage drops 1% below its nominal value.
Note 3: Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Typically the resistor dividers are selected such that it automatically maintains this current.
PIN DESCRIPTIONS
PIN # 1 2 PIN SYMBOL VSENSE SD PIN DESCRIPTIONS 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 shutdown. 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)
3 4 5
Adj V OUT VCTRL
6, 7
VIN
Rev. 1.5 07/16/02
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