STMicroelectronics L4941BV Very low drop 1a regulator Datasheet

L4941
Very low drop 1A regulator
Feature summary
■
Low dropout voltage (450mV typ. at 1A)
■
Very low quiescent current
■
Thermal shutdown
■
Short circuit protection
■
Reverse polarity protection
Description
TO-220
The L4941 is a three terminal 5V positive
regulators available in TO-220 and DPAK
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
DPAK
prolonging battery life. It employs internal current
limiting, antisaturation circuit, thermal shut-down
and safe area protection.
Order code
September 2006
Part number
Package
L4941BV
TO-220
L4941BDT-TR
DPAK
Rev. 5
1/17
www.st.com
17
L4941
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Test circuits
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
............................................... 6
L4941
Block diagram
1
Block diagram
Figure 1.
Block diagram
3/17
Pin configuration
L4941
2
Pin configuration
Figure 2.
Pin connections (top view)
TO-220
4/17
DPAK
L4941
Maximum ratings
3
Maximum ratings
Table 1.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
Forward input voltage
30
V
VIR
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
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied
Table 2.
Thermal Data
Symbol
Parameter
TO-220
DPAK
Unit
RthJC
Thermal resistance junction-case
3
8
°C/W
RthJA
Thermal resistance junction-ambient
50
100
°C/W
5/17
Test circuits
4
Test circuits
Figure 3.
DC Parameters
Figure 4.
Load rejection
Figure 5.
Ripple rejection
6/17
L4941
L4941
Electrical characteristics
5
Electrical characteristics
Table 3.
Electrical characteristics (refer to test circuit, VI=7V, CI = 0.1µF, CO = 22µF, TJ = 25°C,
unless otherwise specified.)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
4.8
5
5.2
V
16
V
VO
Output voltage
IO = 5mA to 1A, VI = 6 to 14V
VI
Input voltage
IO = 5 mA
∆VO
Line regulation
VI = 6 to 16V, IO = 5 mA
5
20
mV
∆VO
IO = 5mA to 1A
8
20
mV
Load regulation
IO = 0.5A to 1A
5
15
mV
IO = 5 mA, VI = 6V
4
8
mA
IO = 1A, VI = 6V
20
40
mA
3
mA
-10
mA
Iq
Quiescent current
∆Iq
Quiescent current change
Vd
Dropout voltage
∆VO/∆T
SVR
IO = 5 mA, VI = 6 to 14V
IO = 1A, VI = 6 to 14V
IO = 0.5A
250
450
mV
IO = 1A
450
700
mV
Output voltage drift
Supply voltage rejection
f = 120Hz, IO = 1A
58
0.6
mV/°C
68
dB
VI = 14V
1.6
2.0
VI = 6V
1.8
2.2
Output impedance
f = 1KHz, IO = 0.5A
30
mΩ
Output noise voltage
B = 100Hz to 100KHz
30
µV/VO
Isc
Short circuit current
ZO
eN
A
7/17
Typical application
L4941
6
Typical application
Figure 6.
Dropout voltage vs output current
Figure 7.
Dropout voltage vs temperature
Figure 8.
Output voltage vs temperature
Figure 9.
Quiescent current vs temperature
Figure 10. Quiescent current vs input voltage Figure 11. Quiescent current vs output current
8/17
L4941
Typical application
Figure 12. Short circuit current vs temperature Figure 13. Peak output current vs input/output
differential voltage
Figure 14. Low voltage behavior
Figure 15. Supply voltage rejection vs
frequency
Figure 16. Supply voltage rejection vs output
current
Figure 17. Load dump characteristics
9/17
Typical application
Figure 18. Line transient response
Figure 20. Load transient response
10/17
L4941
Figure 19. Total power dissipation
L4941
7
Schematic application
Schematic application
Figure 21. Distributed supply with On-card L4940 and L4941 low drop regulator
Figure 22. Distributed Supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OF THESE APPLICATION ARE:
On card regulation with short-circuit and thermal protection on each output.
Vary high total system efficiency due to the switching preregulation and very low-drop postregulation.
11/17
Package mechanical data
8
L4941
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
12/17
L4941
Package mechanical data
TO-220 MECHANICAL DATA
DIM.
mm.
MIN.
MAX.
MIN.
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
TYP
inch
1.27
TYP.
MAX.
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
L2
16.4
0.409
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
13/17
Package mechanical data
L4941
DPAK MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
A1
A2
B
b4
2.2
0.9
0.03
0.64
5.2
2.4
1.1
0.23
0.9
5.4
0.086
0.035
0.001
0.025
0.204
0.094
0.043
0.009
0.035
0.212
C
C2
D
D1
E
E1
0.45
0.48
6
0.6
0.6
6.2
0.017
0.019
0.236
0.023
0.023
0.244
6.6
0.252
e
e1
H
L
(L1)
L2
L4
R
V2
5.1
6.4
0.200
4.7
0.185
2.28
0.090
4.4
9.35
1
4.6
10.1
0.173
0.368
0.039
2.8
0.8
0.6
0.181
0.397
0.110
0.031
1
0.023
0.2
0°
0.260
0.039
0.008
8°
0°
8°
0068772-F
14/17
L4941
Package mechanical data
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
15/17
Revision history
L4941
9
Revision history
Table 4.
Revision history
Date
Revision
21-Jun-2004
4
Document updating.
15-Sep-2006
5
Order Codes has been updated and new template.
16/17
Changes
L4941
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