US1150

2-3

Rev. 1.2

10/28/99

ELECTRICAL SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

Control Pin Current

Vadj=0V for all below conditions.

Vctrl=2.75V,Vin=2.05V,Io=1.5A

6

10

mA

Vctrl=2.75V,Vin=2.05V,Io=3A

30

60

Vctrl=2.75V,Vin=2.05V,Io=4A

33

70

Adjust Pin Current

Iadj

Vctrl=2.75V,Vin=2.05V,Vadj=0V,

50

120

uA

PIN DESCRIPTIONS

PIN DESCRIPTIONS

PIN #

PIN SYMBOL

PIN DESCRIPTION

1

Vsense

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

to achieve excellent load regulation.

2

Adj

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

3

Vout

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

pin to ground to insure stability.

4

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)

5

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)

Note 1 : Low duty cycle pulse testing with Kelvin con-

nections are required in order to maintain accurate data.

Note 2 : Drop-out voltage is defined as the minimum

differential between Vin and Vout required to maintain

regulation at Vout. It is measured when the output volt-

age 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.