View l4920-21 datasheet:

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 Pentawatt PROTECTION .SHORT CIRCUIT PROTECTION WITH FOLD- BACK CHARACTERISTICS .THERMAL SHUT-DOWN DESCRIPTION The L4920and L4921 are adjustable voltage regu- Minidip (4 + 4) latorswith a verylow voltage drop(0.4V typ.at 0.4A Tj =25°C), low quiescent current and comprehen- sive on-chip protection. ORDERING NUMBERS : L4920 (Pentawatt) Thesedevicesareprotectedagainstload dumpand L4921 (Minidip) field decay transients, polarity reversal and over heating. A foldbackcurrentlimiter protectsagainstload short These regulators are designed for automo