SGS Thomson Microelectronics L4941BV, L4941BS, L4941BDT Datasheet
L4941
April1994
VERY LOW DROP 1A REGULATOR
.LOWDROPOUTVOLTAGE (450mV typ
at1A)
.VERYLOW QUIESCENT CURRENT
.THERMALSHUTDOWN
.SHORTCIRCUITPROTECTION
.REVERSE POLARITY PROTECTION
DESCRIPTION
The L4941is a threeterminal 5 V 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.
TO-220 DPAK (TO-252)
BLOCK DIAGRAM
SOT-82 SOT-194
1
3
1/13
ABSOLUTE MAXIMUM RATINGS
Symbol Paramet e r Valu e Unit
V
i
Forward Input Voltage 30 V
V
iR
Reverse Input Voltage (RO= 100 Ω)–15V
I
O
Output Current Internally Limited
P
tot
Power Dissipation Internally Limited
T
j,Tstg
Junction and Storage Temperature – 40 to 150 °C
PIN CON NEC TIONS AND ORDERI NG NUMBER (top view)
THERMAL DATA
SOT-82
SOT-194
DPAK
TO-220
R
thj-case
Thermal Resistance Junction-case Max 8 3
o
C/W
R
thj-amb
Termalresistance Junction-ambient Max 100 50
o
C/W
TO-220 SOT-82/SOT-194
ORDERING NUMBERS OUTPUT VOLTAGE PACKAGE
L4941BV 5V TO-220
L4941BX 5V SOT-82
L4941BS 5V SOT-194
L4941BDT 5V DPAK
DPAK
L4941
2/13
Figure 2 : LoadRegulation.
Figure 3 : RippleRejection.
Figure 1 : DCParameters.
TEST CIRCUITS
L4941
3/13
ELECTRICAL CHARACTERISTICS (refer to the test circuits Tj=25°C,Ci= 0.1 µF, Co=22µF,
unless otherwise specified)
Symbol P arameter Test Conditions Min. Typ. Max. Unit
Output Voltage 5
Input Voltage (unless otherwise specified) 7
V
o
Output Voltage Io= 5 mA to 1 A
Vi=6Vto14V
4.8 5 5.2 V
V
i
Operating Input Voltage Io= 5 mA 16 V
∆V
o
Line Regulation Vi=6Vto16V
Io=5mA
520mV
∆V
o
Load Regulation Io= 5 mA to 1 A
Io= 0.5 A to 1 A
8
5
20
15
mV
I
Q
Quiescent Current Io=5mA 4 8
V
i
=6V
I
o
=1A 20 40
mA
∆I
Q
Quiescent Current
Change
Io= 5 mA 3
V
i
=6Vto14V
I
o
=1A –10
mA
V
d
Dropout Voltage Io= 0.5 A 250 450
I
o
= 1 A 450 700
mV
∆V
o
____
∆T
Output Voltage Drift 0.6 mV/°C
SVR Supply Voltage
Rejection
f = 120 Hz
I
o
= 0.5 A
58 68 dB
I
sc
Short Circuit Current
Limit
Vi= 14 V 1.6 2.0
V
i
= 6 V 1.8 2.2
A
Z
o
Output Impedance f = 1 kHz
I
o
= 0.5 A
30 mΩ
e
N
Output Noise Voltage B = 100 Hz to 100 kHz 30 µV/V
o
Figure 4 : Dropoutvoltage vs.Output Current. Figure5 : Dropout Voltage vs. Temperature.
L4941
4/13
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