STMicroelectronics L4941BS Very low drop 1a regulator Datasheet

L4941
VERY LOW DROP 1A REGULATOR
■
LOW DROPOUT VOLTAGE (450mV Typ. at
1A)
■
VERY LOW QUIESCENT CURRENT
■
THERMAL SHUTDOWN
■
SHORT CIRCUIT PROTECTION
■
REVERSE POLARITY PROTECTION
TO-220
TO-220FP
DESCRIPTION
The L4941 is a three terminal 5V positive
regulators available in TO-220, TO-220FP and
D2PAK packages, making it useful in a wide range
of industrial and consumer applications. Thanks to
its very low input/output voltage drop, these
devices are particularly suitable for battery
powered equipments, reducing consumption and
prolonging battery life. It employs internal current
limiting, antisaturation circuit, thermal shut-down
and safe area protection.
D2PAK
DPAK
BLOCK DIAGRAM
January 2004
1/14
L4941
ABSOLUTE MAXIMUM RATINGS
Symbol
VI
VIR
Parameter
Value
Unit
Forward Input Voltage
30
V
Reverse Input Voltage (RO=100Ω)
-15
V
IO
Output Current
Internally Limited
mA
PD
Power Dissipation
Internally Limited
mW
Tstg
Storage Temperature Range
-40 to +150
°C
Top
Operating Junction Temperature Range
-40 to +150
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
Parameter
TO-220
TO-220FP
D2PAK
DPAK
Unit
Rthj-case
Thermal Resistance Junction-case
3
5
3
8
°C/W
Rthj-amb
Thermal Resistance Junction-ambient
50
60
62.5
100
°C/W
CONNECTION DIAGRAM (top view)
TO-220
D2PAK
TO-220FP
DPAK
ORDERING CODES
ORDERING CODE
PACKAGE
L4941BV
L4941BP
L4941BD2T
TO-220
TO-220FP
L4941BDT (*)
(*) Available in Tape & Reel with the suffix "-TR".
2/14
D2PAK
DPAK
L4941
TEST CIRCUITS
Figure 1 : DC Parameter
Figure 2 : Load Rejection
Figure 3 : Ripple Rejection
3/14
L4941
ELECTRICAL CHARACTERISTICS (Refer to test circuit, VI=7V, CI = 0.1µF, CO = 22µF,
TJ = 25°C, unless otherwise specified.)
Symbol
Parameter
Test Conditions
VO
Output Voltage
IO = 5mA to 1A
VI
Input Voltage
IO = 5 mA
VI = 6 to 14V
Min.
Typ.
Max.
4.8
5
5.2
V
16
V
∆VO
Line Regulation
VI = 6 to 16V
∆VO
Load Regulation
IO = 5mA to 1A
Quiescent Current
IO = 5 mA
VI = 6V
IO = 1A
VI = 6V
20
IO = 5 mA
IO = 1A
IO = 5 mA
5
20
mV
8
20
mV
5
15
mV
4
8
mA
40
mA
VI = 6 to 14V
3
mA
VI = 6 to 14V
-10
mA
IO = 0.5A to 1A
Iq
∆Iq
Vd
Quiescent Current Change
Dropout Voltage
IO = 0.5A
250
450
mV
IO = 1A
450
700
mV
∆VO/∆T Output Voltage Drift
SVR
Isc
Supply Voltage Rejection
Short Circuit Current
Unit
f = 120Hz
IO = 1A
58
0.6
mv/°C
68
dB
VI = 14V
1.6
2.0
VI = 6V
1.8
2.2
ZO
Output Impedance
f = 1KHz
eN
Output Noise Voltage
B = 100Hz to 100KHz
IO = 0.5A
A
30
mΩ
30
µV/VO
TYPICAL CHARACTERISTICS
Figure 4 : Dropout Voltage vs Output Current
4/14
Figure 5 : Dropout Voltage vs Temperature
L4941
Figure 6 : Output Voltage vs Temperature
Figure 9 : Quiescent Current vs Output Current
Figure 7 : Quiescent Current vs Temperature
Figure 10 : Short Circuit Current vs Temperature
Figure 8 : Quiescent Current vs Input Voltage
Figure 11 : Peak Output Current vs Input/Output
Differential Voltage
5/14
L4941
Figure 12 : Low Voltage Behavior
Figure 15 : Load Dump Characteristics
Figure 13 : Supply Voltage Rejection vs
Frequency
Figure 16 : Line Transient Response
Figure 14 : Supply Voltage Rejection vs Output
Current
Figure 17 : Total Power Dissipation
6/14
L4941
Figure 18 : Load transient Response
Figure 19 : Distributed Supply with On-card L4940 and L4941 low drop regulator
7/14
L4941
Figure 20 : Distributed Supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OTF THESE APPLICATION ARE:
On card regulation with short-circuit and thermal protection on each output.
Vary high total system efficency due to the switching preregulation and very low-drop postregulation
8/14
L4941
TO-220 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
inch
MAX.
MIN.
TYP.
MAX.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
D1
1.27
0.050
E
0.49
0.70
0.019
0.027
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.067
F2
1.14
1.70
0.044
0.067
G
4.95
5.15
0.194
0.203
G1
2.4
2.7
0.094
0.106
H2
10.0
10.40
0.393
0.409
L2
16.4
0.645
L4
13.0
14.0
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.2
6.6
0.244
0.260
L9
3.5
3.93
0.137
0.154
DIA.
3.75
3.85
0.147
0.151
P011C
9/14
L4941
TO-220FP MECHANICAL DATA
mm.
DIM.
MIN.
inch
TYP
MAX.
MIN.
TYP.
MAX.
A
4.40
4.60
0.173
0.181
B
2.5
2.7
0.098
0.106
D
2.5
2.75
0.098
0.108
E
0.45
0.70
0.017
0.027
F
0.75
1
0.030
0.039
F1
1.15
1.50
0.045
0.059
F2
1.15
1.50
0.045
0.059
G
4.95
5.2
0.194
0.204
G1
2.4
2.7
0.094
0.106
H
10.0
10.40
0.393
0.409
L2
16
0.630
28.6
30.6
1.126
1.204
L4
9.8
10.6
0.385
0.417
L6
15.9
16.4
0.626
0.645
L7
9
9.3
0.354
0.366
DIA.
3
3.2
0.118
0.126
B
D
A
E
L3
L3
L6
F2
H
G
G1
¯
F
F1
L7
1 2 3
L2
L4
7012510/G
10/14
L4941
D2PAK MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.4
4.6
0.173
0.181
A1
2.49
2.69
0.098
0.106
A2
0.03
0.23
0.001
0.009
B
0.7
0.93
0.027
0.036
B2
1.14
1.7
0.044
0.067
C
0.45
0.6
0.017
0.023
C2
1.23
1.36
0.048
0.053
D
8.95
9.35
0.352
0.368
10.4
0.393
D1
E
8
10
E1
0.315
8.5
0.409
0.335
G
4.88
5.28
0.192
0.208
L
15
15.85
0.590
0.624
L2
1.27
1.4
0.050
0.055
L3
1.4
1.75
0.055
0.068
M
2.4
3.2
0.094
R
V2
0.4
0˚
0.126
0.016
8˚
0˚
8˚
P011P6G
11/14
L4941
DPAK MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
2.2
2.4
0.086
A1
0.9
1.1
0.035
0.094
0.043
A2
0.03
0.23
0.001
0.009
B
0.64
0.9
0.025
0.035
B2
5.2
5.4
0.204
0.212
C
0.45
0.6
0.017
0.023
C2
0.48
0.6
0.019
0.023
D
6
6.2
0.236
D1
E
5.1
6.4
0.244
0.200
6.6
0.252
0.260
E1
4.7
0.185
e
2.28
0.090
e1
4.4
4.6
0.173
0.181
H
9.35
10.1
0.368
0.397
L
(L1)
L2
L4
1
0.039
2.8
0.110
0.8
0.6
0.031
1
0.023
0.039
0068772-F
12/14
L4941
Tape & Reel DPAK-PPAK MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
330
13.0
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
MAX.
0.504
0.512
22.4
0.519
0.882
Ao
6.80
6.90
7.00
0.268
0.272
0.2.76
Bo
10.40
10.50
10.60
0.409
0.413
0.417
Ko
2.55
2.65
2.75
0.100
0.104
0.105
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
7.9
8.0
8.1
0.311
0.315
0.319
13/14
L4941
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consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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