L4921 데이터 시트보기 (PDF) - STMicroelectronics

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L4921

VERY LOW DROP ADJUSTABLE REGULATORS

STMicroelectronics 

L4920

®

L4921

VERY LOW DROP ADJUSTABLE REGULATORS

. VERY LOW DROP VOLTAGE

. ADJUSTABLE OUTPUT VOLTAGE FROM

1.25V TO 20V

. 400mA OUTPUT CURRENT

. LOW QUIESCENT CURRENT

. REVERSE VOLTAGE PROTECTION

. + 60/ − 60V TRANSIENT PEAK VOLTAGE

PROTECTION

. SHORT CIRCUIT PROTECTION WITH FOLD-

BACK CHARACTERISTICS

. THERMAL SHUT-DOWN

P entaw att

DESCRIPTION

The L4920 and L4921 are adjustable voltage regu-

lators with a verylow voltage drop (0.4V typ. at 0.4A

Tj = 25°C), low quiescent current and comprehen-

sive on-chip protection.

Thesedevices are protectedagainst load dump and

field decay transients, polarity reversal and over

heating.

A foldbackcurrent limiter protectsagainstload short

circuits.

The outputvoltage is adjustablethrough an external

divider from 1.25V to 20V. The minimum operating

input voltage is 5.2V (TJ = 25°C).

Minidip (4 + 4)

ORDERING NUMBERS : L4920 (Pentawatt)

L4921 (Minidip)

These regulators are designed for automotive, in-

dustrial and consumer applications where low con-

sumption is particularly important.

In battery backup and standby applications the low

consumption of these devices extends battery life.

BLOCK DIAGRAM

June 2000

1/7

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