.LOWDROPOUTVOLTAGE (450mV typ
at1A)
.VERYLOW QUIESCENT CURRENT
.THERMALSHUTDOWN
.SHORTCIRCUITPROTECTION
.REVERSEPOLARITYPROTECTION
L4941
VERY LOW DROP 1A REGULATOR
DESCRIPTION
The L4941is a threeterminal 5V positive regulator
available in TO-220,SOT-82, SOT-194 and DPAK
packages, making it useful in a wide range of the
industrial and consumer applications. Thanks to its
very low input/output voltage drop, this device is
particularlysuitable forbatterypoweredequipment,
reducing consumptionand prolonging batterylife.It
employs internal current limiting, antisaturation
circuit,thermal shut-downand safeareaprotection.
BLOCK DIAGRAM
SOT-82 SOT-194
3
1
TO-220 DPAK (TO-252)
April1994
1/13
L4941
PIN CONNECTI O NS AND ORDERI NG NUMB ER ( t op v iew)
TO-220 SOT-82/SOT-194
DPAK
ORDERING NUMBERS OUTPUT VOLTAGE PACKAGE
L4941BV 5V TO-220
L4941BX 5V SOT-82
L4941BS 5V SOT-194
L4941BDT 5V DPAK
ABSOLUTE MAXIMUM RATINGS
Symbol Paramet e r Valu e Unit
V
Forward Input Voltage 30 V
i
V
P
T
j,Tstg
Reverse Input Voltage (RO= 100 Ω)–15V
iR
Output Current Internally Limited
I
O
Power Dissipation Internally Limited
tot
Junction and Storage Temperature – 40 to 150 °C
THERMAL DATA
TO-220
o
o
R
thj-case
R
thj-amb
SOT-82
SOT-194
DPAK
Thermal Resistance Junction-case Max 8 3
Termalresistance Junction-ambient Max 100 50
C/W
C/W
2/13
TEST CIRCUITS
Figure 1 : DCParameters.
Figure 2 : LoadRegulation.
L4941
Figure 3 : RippleRejection.
3/13
L4941
ELECTRICAL CHARACTERISTICS (refer to the test circuits Tj=25°C, Ci= 0.1 µF, Co=22µF,
unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Output Voltage 5
Input Voltage (unless otherwise specified) 7
V
V
∆V
∆V
I
Q
∆I
V
∆V
____
∆T
SVR Supply Voltage
I
sc
Z
e
Output Voltage Io= 5 mA to 1 A
o
4.8 5 5.2 V
Vi=6Vto14V
Operating Input Voltage Io= 5 mA 16 V
i
Line Regulation Vi=6Vto16V
o
520mV
Io=5mA
Load Regulation Io= 5 mA to 1 A
o
Io= 0.5 A to 1 A
Quiescent Current Io=5mA 4 8
Quiescent Current
Q
Change
Dropout Voltage Io= 0.5 A 250 450
d
Output Voltage Drift 0.6 mV/°C
o
Rejection
Short Circuit Current
Limit
Output Impedance f = 1 kHz
o
Output Noise Voltage B = 100 Hz to 100 kHz 30 µV/V
N
=6V
V
i
V
=6Vto14V
i
I
= 1 A 450 700
o
f = 120 Hz
= 0.5 A
I
o
I
=1A 20 40
o
Io= 5 mA 3
=1A –10
I
o
58 68 dB
Vi= 14 V 1.6 2.0
V
= 6 V 1.8 2.2
i
I
= 0.5 A
o
8
5
30 mΩ
20
15
mV
mA
mA
mV
A
o
Figure 4 : Dropout voltagevs. Output Current. Figure5 : DropoutVoltage vs. Temperature.
4/13
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