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Part: IRU1175CM
Category:
Description: 7.5A Adj LDO Linear Regulator in a TO-263 5-Leads Package
Company: International Rectifier Corp.
Datasheet: Download IRU1175CM datasheet File size : 278 kB
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Data Sheet No. PD94131
IRU1175
7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR DESCRIPTION
The IRU1175 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. This product is specifically designed to provide well regulated supply for applications requiring 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 associated with switching regulators. One such application is the new graphic chip sets that require 2.7V supply such as the Intel I740 chip set.
FEATURES
0.5V Dropout at 7.5A (Equivalent of 67mV) 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 100uF
VIN VCTRL
5 4 3 2 1
R1 100 1% R2 124 1% C2 10uF
IRU1175
V UT O Adj VSENSE
2.7V
C3 100uF
5V
Figure 1 - Typical application of IRU1175.
PACKAGE ORDER INFORMATION
TJ (°C) 0 To 125 5-PIN PLASTIC TO-263 (M) IRU1175CM 5-PIN PLASTIC Ultra Thin-PakTM (P) IRU1175CP
Rev. 1.7 04/09/03
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1
IRU1175
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .... Control Input Voltage (VCTRL) .... Power Dissipation ..... Storage Temperature Range ..... Operating Junction Temperature Range ............ 6V 14V Internally Limited -65°C To 150°C 0°C To 150°C
PACKAGE INFORMATION
5-PIN PLASTIC TO-263 (M)
5 4 3 2 1
5-PIN PLASTIC ULTRA THIN-PAKTM (P)
5 4 3 2 1
VIN VCTRL VOUT Adj VSENSE
VIN VCTRL VOUT Adj VSENSE
uJA=35°C/W for 0.5" square pad
uJA=35°C/W for 0.5" square pad
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. PARAMETER Reference Voltage SYM VREF TEST CONDITION
VCTRL=2.75, VIN=2V, Io=10mA,
MIN 1.225 1.225
TYP 1.250 1.250 0.5 2 0.95 1.00 1.05 1.15 0.100 0.200 0.330 0.500
MAX 1.275 1.275 3 6
UNITS V
TJ=258C, VADJ=0V
VCTRL=2.7 to 12V, VIN=2.05V to 5.5V,
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
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=5A 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=3A 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=3A, VADJ=0V, TJ=258C, VRIPPLE=1VPP at 120Hz
mV mV V
1.30 0.130 0.260 0.430 0.650 V
7.7
9 5 0.01 70
10 0.02
A mA %/W dB
60
2
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Rev. 1.7 04/09/03
IRU1175
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=5A VCTRL=2.75V, VIN=2.05V, Io=7.5A VCTRL=2.75V, VIN=2.05V, VADJ=0V MIN TYP 15 30 50 70 50 MAX UNITS mA
Adjust Pin Current
IADJ
120
mA
Note 1: Low duty cycle pulse testing with Kelvin connections are 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 3 4 PIN SYMBOL VSENSE Adj V OUT VCTRL PIN DESCRIPTION This pin is the positive side of the reference which allows remote load sensing to achieve excellent load regulation. 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)
5
VIN
Rev. 1.7 04/09/03
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