Page 1
.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
Page 2
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
Page 3
TEST CIRCUITS
Figure 1 : DCParameters.
Figure 2 : LoadRegulation.
L4941
Figure 3 : RippleRejection.
3/13
Page 4
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
Page 5
L4941
Figure 6 : Outputvoltage vs. Temperature. Figure7 : Quiescent Current vs. Temperature
Figure 8 : Quiescent Current vs.InputVoltage. Figure9 : Quiescent Current vs.OutputCurrent.
Figure 10: Short-circuit Current vs. Temperature. Figure11 : Peak Output Current vs. Input/Output
Differential Voltage.
5/13
Page 6
L4941
Figure 12: LowVoltage Behavior. Figure13 : Supply Voltage Rejectionvs.
Frequency
Figure 14: Supply Voltage Rejection vs. Output
Current.
Figure 16: LineTransientResponse. Figure17 : Load Transunt Response.
Figure15 : Load DumpCharacteristics.
6/13
Page 7
Figure 18: TotalPowerDissipation (TO-220).
Figure 19: DistribuedSupply with On-card L4940 andL4941 Low-drop Regulators.
L4941
ADVANTAGES OF THESE APPLICATIONS ARE :
On card regulation with short-circuit andthermal protection oneach output.
-
Very hightotalsystemefficiencydue to the switchingpreregulation andverylow-drop postregulations.
-
7/13
Page 8
L4941
Figure 20 : Distribued Supply with On-card L4940 and L4941 Low-drop Regulators.
8/13
Page 9
TO-220 MECHANICAL DATA
L4941
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110
D1 1.2 1.35 0.047 0.053
E 0.35 0.55 0.014 0.022
F 0.8 1.05 0.031 0.041
F2 1.15 1.4 0.045 0.055
G 4.95 5.08 5.21 0.195 0.200 0.205
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409
L2 16.2 0.638
L3 26.3 26.7 27.1 1.035 1.051 1.067
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260
Dia. 3.65 3.85 0.144 0.152
mm inch
P011D
9/13
Page 10
L4941
SOT-82 MECHANICALDATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 7.4 7.8 0.291 0.307
B 10.5 11.3 0.413 0.445
b 0.7 0.9 0.028 0.035
b1 0.49 0.75 0.019 0.030
C 2.4 2.7 0.04 0.106
c1 1.2 0.047
D 15.7 0.618
e 2.2 0.087
e3 4.4 0.173
F 3.8 0.150
H 2.54 0.100
mm inch
C
c1
b
b1
A
F
BD
H
e
e3
P032A
10/13
Page 11
SOT-194 MECHANICALDATA
L4941
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 7.4 7.8 0.291 0.307
B 10.5 11.3 0.413 0.445
b 0.7 0.9 0.028 0.035
b1 0.49 0.75 0.019 0.030
C 2.4 2.7 0.094 0.106
c1 1.2 0.047
c2 1.3 0.051
D 6 0.236
e 2.2 0.087
e3 4.4 0.173
F 3.8 0.150
H 2.54 0.100
P45°(typ.)
S 4 0.157
S1 2 0.079
T 0.1 0.004
mm inch
C
A
F
B
C1
H
D
b1
T
e
SS1
P
b
c2
e3
P032B
11/13
Page 12
L4941
TO-252 (DPAK) MECHANICAL DATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 2.2 2.4 0.086 0.094
A1 0.9 1.1 0.035 0.043
B 0.64 0.8 0.025 0.031
B1 3.4 3.6 0.133 0.141
B2 5.2 5.4 0.204 0.212
B3 0.9 0.035
B4 1.9 2.1 0.074 0.082
C 0.48 0.6 0.018 0.023
C1 0.45 0.6 0.017 0.023
D 6 6.2 0.236 0.244
E 6.4 6.6 0.252 0.260
G 4.4 4.6 0.173 0.181
H 9.35 10.1 0.368 0.397
L 2.55 3.05 0.100 0.120
L1 0.6 1 0.023 0.039
L2 0.8 0.031
L3 0.8 1.2 0.031 0.047
L4 0.3 0.45 0.012 0.017
mm inch
12/13
A
B2EB1
==
==
C
L2
L4
B4
==
==
H
A1
B3
C1
B
L3
D
L
= G =
123
L1
Page 13
L4941
Information furnishedis believed to be accurateand reliable.However, SGS-THOMSON Microelectronics assumesno responsability for the
consequences of useof such informationnor for any infringement of patentsor otherrights ofthird partieswhich may results fromits use. No
license is granted by implication or otherwise underany patentor patent rights ofSGS-THOMSON Microelectronics.Specificationsmentioned
in thispublication aresubject to changewithout notice.This publicationsupersedes and replaces all informationpreviously supplied.
SGS-THOMSON Microelectronicsproductsare not authorizedfor use ascritical componentsin life support devicesorsystems without express
written approval of SGS-THOMSONMicroelectonics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
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Singapore- Spain - Sweden- Switzerland - Taiwan- Thailand - United Kingdom- U.S.A
SGS-THOMSON MicroelectronicsGROUP OFCOMPANIES
13/13
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