IRU1176 データシートの表示（PDF） - International Rectifier

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IRU1176

7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT

International Rectifier 

IRU1176

PARAMETER

Control Pin Current

Adjust Pin Current

SYM

IADJ

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

50

MAX

120

UNITS

mA

mA

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.

PIN DESCRIPTIONS

PIN #

1

PIN SYMBOL

VSENSE

PIN DESCRIPTIONS

This pin is the positive side of the reference which allows remote load sensing to achieve

excellent load regulation.

2

SD

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.

3

Adj

A resistor divider from this pin to the VOUT pin and ground sets the output voltage.

4

VOUT

The output of the regulator. A minimum of 10mF capacitor must be connected from this pin

to ground to insure stability.

5

VCTRL

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)

6, 7

VIN

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)

Rev. 1.4

03/18/02

www.irf.com

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