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L4920-L4921
VERY LOWDROP ADJUSTABLE REGULATORS
L4920
L4921June 2000
VERY LOW DROP ADJUSTABLE REGULATORS VERYLOW DROP VOLTAGE. ADJUSTABLE OUTPUT VOLTAGE FROM
1.25V TO 20V. 400mA OUTPUT CURRENT. LOW QUIESCENT CURRENT. REVERSEVOLTAGE PROTECTION.+ 60/− 60V TRANSIENT PEAK VOLTAGE
PROTECTION. SHORT CIRCUIT PROTECTION WITH FOLD-
BACK CHARACTERISTICS. THERMAL SHUT-DOWN
DESCRIPTION
Pentawatt
ORDERING NUMBERS: L4920 (Pentawatt)
L4921 (Minidip)
BLOCK DIAGRAMThe L4920and L4921 are adjustable voltage regu-
lators witha verylow voltage drop(0.4Vtyp.at 0.4A =25°C), low quiescent current and comprehen-
siveon-chip protection.
Thesedevicesare protectedagainst load dumpand
field decay transients, polarity reversal and over
heating. foldbackcurrent limiterprotectsagainstload short
circuits.
The outputvoltageis adjustablethroughanexternal
divider from1.25Vto 20V.The minimum operating
input voltageis 5.2V (TJ =25°C).
Minidip(4+4)
These regulators are designedfor automotive,in-
dustrial and consumer applicationswhere low con-
sumptionis particularly important. batterybackup and standbyapplicationsthe low
consumptionof these devices extends batterylife.
1/7
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit DC Input Operating Voltage Reverse Input Voltage
Transient Input Overvoltages:
Load Dump:
5ms≤ trise≤ 10ms Fall time constant= 100ms
RSOURCE≥ 0.5Ω
Field Decay:
5ms≤tfall≤ 10ms, RSOURCE≥ 10Ω Rise time constant= 33ms V
TJ,TSTG Junction and Storage Temperature Range –55to 150 °C
PIN CONNECTIONS (top view)
TEST AND APPLICATION CIRCUIT
THERMAL DATA
Symbol Parameter Minidip+4)
PentawattRth j-amb
Rth j-pins
Rth j-case
Thermal Resistance Junction-ambient
Thermal Resistance Junction-pins
Thermal Resistance Junction-case
Max
Max
Max °C/W °C/W °C/W
3.5 °C/W= 100μFis requiredfor stability (ESR≤ 3Ω overT range)= 6.2KΩ.
L4920/L49212/7
(*) Foldback protection.
Note: 1. Design limits are guaranteed (butnot 100% production tested) over the indicated temperature and supply voltage
ranges. These limitsarenot usedto calculate outgoing quality levels.
ELECTRICALCHARACTERISTICS(forVI =14.4V,TJ =25°C,VO= 5V,CO =100μF,unlessOtherwiseSpeci-
fied)
Symbol Parameter Test Condition Min. Typ. Max. Unit Operating Input Voltage VO≥ 4.5V,IO= 400mA VO+0.7 26 V
VREF≤VO< 4.5V,IO= 400mA 5.2 26 V
VREF Reference Voltage 5.2V
5mA≤IO≤ 400mA(*)
1.20 1.25 1.30 V
ΔVO Line Regulation VO +1VΔVO Load Regulation 5mA≤IO≤ 400mA(*) VO≥ 4.5V 3 15 mV/V Dropout Voltage IO= 10mA= 150mA= 400mA
0.7 Quiescent Current IO= 0mA +1VIOSC Short Circuit Output Current(*) 350 500 mA
(*) Foldback protection
ELECTRICAL CHARACTERISTICS (forVI =14.4V,–40≤TJ≤ 125°C (note1),VO= 5V,CO =100μF,unless
Otherwise Specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit Operating Input Voltage VO≥ 4.5V,IO= 400mA VO+0.9 26 V
VREF≤VO< 4.5V,IO= 400mA 5.2 26 V
VREF Reference Voltage 5.4VΔVO Line Regulation VO+ 1.2VΔVO Load Regulation 5mA≤IO≤ 400mA(*) VO≥ 4.5V 5 25 mV/V Dropout Voltage IO= 150mA= 400mA
0.7 Quiescent Current IO= 0mA+ 1.2VIOSC Short Circuit Output Current(*) 230 500 mA
L4920/L4921
3/7
Figure3: QuiescentCurrent vs. OutputCurrent
(Vo= 5V).
APPLICATION INFORMATION The L4920 and L4921haveVREF≅ 1.25V.Then
the output voltage can beset downto VREF but mustbe greaterthan 5.2V(Tj =25°C).As the regulatorreferencevoltage source works closedloop, thereferencevoltagemaychange foldbackcondition. For applications with highVl, the total power
dissipationof the device with respectto the ther-
mal resistanceof the packagemaybe limiting. The
total power dissipationis:
Ptot =Vilq +(Vi -Vo)lo typical curve giving the quiescent currentlqasa
functionof the outputcurrentlois shownin fig.3.
Figure1: Output Voltagevs. Temperature. Figure2: FoldbackCurrent Limiting.
L4920/L4921
4/7
PowerMinidip
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 3.3 0.130 0.7 0.028 1.39 1.65 0.055 0.065 0.91 1.04 0.036 0.041 0.5 0.020 0.38 0.5 0.015 0.020 9.8 0.386 8.8 0.346 2.54 0.100 7.62 0.300 7.62 0.300 7.1 0.280 4.8 0.189 3.3 0.130 0.44 1.6 0.017 0.063
OUTLINE AND
MECHANICAL DATA
L4920/L4921
5/7
PentawattV
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 4.8 0.189 1.37 0.054 2.4 2.8 0.094 0.110 1.2 1.35 0.047 0.053 0.35 0.55 0.014 0.022 0.76 1.19 0.030 0.047 0.8 1.05 0.031 0.041 1 1.4 0.039 0.055 3.2 3.4 3.6 0.126 0.134 0.142 6.6 6.8 7 0.260 0.268 0.276 10.4 0.409 10.05 10.4 0.396 0.409 17.55 17.85 18.15 0.691 0.703 0.715 15.55 15.75 15.95 0.612 0.620 0.628 21.2 21.4 21.6 0.831 0.843 0.850 22.3 22.5 22.7 0.878 0.886 0.894 1.29 0.051 2.6 3 0.102 0.118 15.1 15.8 0.594 0.622 6 6.6 0.236 0.260 0.2 0.008 4.23 4.5 4.75 0.167 0.177 0.187 3.75 4 4.25 0.148 0.157 0.167 40° (typ.) L2D
Dia.
GG1
RESIN BETWEEN
LEADSV1
OUTLINE AND
MECHANICAL DATA
L4920/L4921
6/7
