May 2017
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This is information on a product in full production.
www.st.com
LEXX
Very low-dropout voltage regulator with inhibit function
Datasheet - production data
Features
Very low-dropout voltage (0.2 V typ.)
Very low quiescent current (typ. 50 µA in
OFF mode, 0.5 mA in ON mode, no load)
Output current up to 100 mA
Output voltages: 3 V, 3.3 V, 4.5 V, 5 V, 8 V
Internal current and thermal limit
Small 2.2 µF capacitor for stability
Available in ±1% (A) or ±2% (C) selection at
25 °C
Supply voltage rejection: 80 dB (typ.)
Temperature range: -40 to 125 °C
Description
The LEXX is a very low-dropout voltage regulator
available in SO-8, TO-92 packages and over a
wide range of output voltages.
The very low-dropout voltage (0.2 V) and low
quiescent current make it particularly suitable for
low-noise, low-power applications and in battery-
powered systems.
This device is pin-to-pin compatible with the L78L
series. Furthermore, in the 8-pin configuration
(SO-8), it uses a shutdown logic control (pin 5,
TTL compatible). This means that when the
device is used as a local regulator, a part of the
board can be put in standby, decreasing the total
power consumption. In the three-terminal
configuration (TO-92), the device is always in
on-state. It requires a 2.2 µF capacitor for
stability, reducing the component size and cost.
Table 1: Device summary
Order code
SO-8
TO-92 (Ammopack)
TO-92 (tape and reel)
LE30CD-TR
3
LE33CD-TR
LE33CZ-AP
LE33CZ-TR
3.3
LE45CD-TR
4.5
LE50ABD-TR
LE33ABZ-AP
5
LE50CD-TR
5
LE80CD-TR
8
Contents
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Contents
1 Diagram ............................................................................................ 3
2 Pin configuration ............................................................................. 4
3 Maximum ratings ............................................................................. 5
4 Electrical characteristics ................................................................ 6
5 Typical performance characteristics ........................................... 13
6 Package information ..................................................................... 16
6.1 SO-8 package information .............................................................. 16
6.2 SO-8 packing information ................................................................ 18
6.3 TO-92 packing information .............................................................. 19
6.4 TO-92 Ammopak packing information ............................................. 21
7 Revision history ............................................................................ 23
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Diagram
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1 Diagram
Figure 1: Block diagram
Pin configuration
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2 Pin configuration
Figure 2: Pin connections (SO-8 top view, TO-92 bottom view)
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Maximum ratings
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3 Maximum ratings
Table 2: Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
DC input voltage
20
V
IO
Output current
Internally limited (1)
PTOT
Power dissipation
Internally limited
TSTG
Storage temperature range
-65 to 150
°C
TOP
Operating junction temperature range
-40 to 125
°C
Notes:
(1)Our SO-8 package, used for voltage regulators, is modified internally to have pins 2, 3, 6 and 7 electrically fused
to the die attach pad. This frame decreases the total thermal resistance of the package and increases its ability to
dissipate power when an appropriate area of copper on the printed circuit board is available for heatsinking. The
external dimensions are the same as SO-8 standard.
Table 3: Thermal data
Symbol
Parameter
SO-8
TO-92
Unit
RthJC
Thermal resistance junction-case
20
°C/W
RthJA
Thermal resistance junction-ambient
55
200
°C/W
Figure 3: Test circuit
If the INHIBIT pin is left floating, the regulator is in ON mode. However, when the
inhibit function is not used, it should be grounded to avoid any noise.
Electrical characteristics
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4 Electrical characteristics
Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 4: LE30AB electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 5 V
2.970
3
3.030
V
IO = 10 mA
VI = 5 V
TJ = -25 to 85 °C
2.940
3.060
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
mA
∆VO
Line regulation
VI = 3.7 to 18 V
IO = 0.5 mA
3
15
mV
∆VO
Load regulation
VI = 4 V
IO = 0.5 to 100 mA
3
15
mV
Id
Quiescent current
VI = 4 to 18 V
IO = 0 mA
ON mode
0.5
1
mA
VI = 4 to 18 V
IO = 100 mA
1.5
3
VI = 6 V
OFF mode
50
100
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 5 ± 1 V
f = 120 Hz
81
dB
f = 1 kHz
76
f = 10 kHz
60
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 6 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
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Electrical characteristics
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Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 5: LE30C electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 5 V
2.940
3
3.060
V
IO = 10 mA
VI = 5 V
TJ = -25 to 85 °C
2.880
3.120
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
mA
∆VO
Line regulation
VI = 3.7 to 18 V
IO = 0.5 mA
3
20
mV
∆VO
Load regulation
VI = 4 V
IO = 0.5 to 100 mA
3
25
mV
Id
Quiescent current
VI = 4 to 18 V
IO = 0 mA
ON mode
0.5
1
mA
VI = 4 to 18 V
IO = 100 mA
1.5
3
VI = 6 V
OFF mode
50
100
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 5 ± 1 V
f = 120 Hz
81
dB
f = 1 kHz
76
f = 10 kHz
60
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 6 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
Electrical characteristics
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Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 6: LE33C electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 5.3 V
3.234
3.3
3.366
V
IO = 10 mA
VI = 5.3 V
TJ = -25 to 85 °C
3.168
3.432
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
mA
∆VO
Line regulation
VI = 4 to 18 V
IO = 0.5 mA
3
20
mV
∆VO
Load regulation
VI = 4.3 V
IO = 0.5 to 100 mA
3
25
mV
Id
Quiescent current
VI = 4.3 to 18 V
IO = 0 mA
ON mode
0.5
1
mA
VI = 4.3 to 18 V
IO = 100 mA
1.5
3
VI = 6 V
OFF mode
50
100
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 5.3 ± 1 V
f = 120 Hz
80
dB
f = 1 kHz
75
f = 10 kHz
60
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 6 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
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Electrical characteristics
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Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 7: LE45C electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 6.5 V
4.41
4.5
4.59
V
IO = 10 mA
VI = 6.5 V
TJ = -25 to 85 °C
4.32
4.68
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
mA
∆VO
Line regulation
VI = 5.2 to 18 V
IO = 0.5 mA
4
30
mV
∆VO
Load regulation
VI = 5.5 V
IO = 0.5 to 100 mA
3
25
mV
Id
Quiescent current
VI = 5.5 to 18 V
IO = 0 mA
ON mode
0.5
1
mA
VI = 5.5 to 18 V
IO = 100 mA
1.5
3
VI = 6 V
OFF mode
50
100
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 6.5 ± 1 V
f = 120 Hz
77
dB
f = 1 kHz
72
f = 10 kHz
60
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 6 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
Electrical characteristics
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Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 8: LE50AB electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 7 V
4.95
5
5.05
V
IO = 10 mA
VI = 7 V
TJ = -25 to 85 °C
4.9
5.1
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
350
425
mA
∆VO
Line regulation
VI = 5.7 to 18 V
IO = 0.5 mA
4
20
mV
∆VO
Load regulation
VI = 6 V
IO = 0.5 to 100 mA
3
15
mV
Id
Quiescent current
VI = 6 to 18 V
IO = 0 mA
ON mode
0.5
1
mA
VI = 6 to 18 V
IO = 100 mA
1.5
3
VI = 6 V
OFF mode
50
100
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 7 ± 1 V
f = 120 Hz
76
dB
f = 1 kHz
71
f = 10 kHz
60
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 6 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
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Electrical characteristics
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Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 9: LE50C electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 7 V
4.9
5
5.1
V
IO = 10 mA
VI = 7 V
TJ = -25 to 85 °C
4.8
5.2
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
350
425
mA
∆VO
Line regulation
VI = 5.7 to 18 V
IO = 0.5 mA
4
30
mV
∆VO
Load regulation
VI = 6 V
IO = 0.5 to 100 mA
3
25
mV
Id
Quiescent current
VI = 6 to 18 V
IO = 0 mA
ON mode
0.5
1
mA
VI = 6 to 18 V
IO = 100 mA
1.5
3
VI = 6 V
OFF mode
50
100
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 7 ± 1 V
f = 120 Hz
76
dB
f = 1 kHz
71
f = 10 kHz
60
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 6 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
Electrical characteristics
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Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 10: LE80C electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 10 mA
VI = 10 V
7.84
8
8.16
V
IO = 10 mA
VI = 10 V
TJ = -25 to 85 °C
7.68
8.32
VI
Operating input voltage
IO = 100 mA
18
V
IO
Output current limit
150
mA
∆VO
Line regulation
VI = 8.7 to 18 V
IO = 0.5 mA
5
35
mV
∆VO
Load regulation
VI = 9 V
IO = 0.5 to 100 mA
3
25
mV
Id
Quiescent current
VI = 9 to 18 V
IO = 0 mA
ON mode
0.7
1.6
mA
VI = 9 to 18 V
IO = 100 mA
1.7
3.6
VI = 9 V
OFF mode
70
140
µA
SVR
Supply voltage rejection
IO = 5 mA
VI = 10 ± 1 V
f = 120 Hz
72
dB
f = 1 kHz
66
f = 10 kHz
57
eN
Output noise voltage
B = 10 Hz to 100 kHz
50
µV
Vd
Dropout voltage
IO = 100 mA
0.2
0.4
V
IO = 100 mA
TJ = -40 to 125 °C
0.5
VIL
Control input logic low
TJ = -40 to 125 °C
0.8
V
VIH
Control input logic high
TJ = -40 to 125 °C
2
V
II
Control input current
VI = 9 V
VC = 6 V
10
µA
CO
Output bypass capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 100 mA
2
10
µF
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Typical performance characteristics
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5 Typical performance characteristics
Unless otherwise specified, VO(NOM) = 3.3 V.
Figure 4: Dropout voltage vs output current
Figure 5: Dropout voltage vs temperature
Figure 6: Shutdown current vs temperature
Figure 7: Supply current vs input voltage
Typical performance characteristics
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Figure 8: Short-circuit current vs dropout voltage
Figure 9: SVR vs frequency
Figure 10: Logic-controlled precision 3.3/5.0 V selectable output
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Typical performance characteristics
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Figure 11: Sequential multi-output supply
Figure 12: Basic inhibit functions
Package information
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6 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
6.1 SO-8 package information
Figure 13: SO-8 package outline
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Package information
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Table 11: SO-8 mechanical data
Dim.
mm
Min.
Typ.
Max.
A
1.75
A1
0.10
0.25
A2
1.25
b
0.31
0.51
b1
0.28
0.48
c
0.10
0.25
c1
0.10
0.23
D
4.80
4.90
5.00
E
5.80
6.00
6.20
E1
3.80
3.90
4.00
e
1.27
h
0.25
0.50
L
0.40
1.27
L1
1.04
L2
0.25
k
0°
8°
ccc
0.10
Figure 14: SO-8 recommended footprint (dimensions are in mm)
Package information
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6.2 SO-8 packing information
Figure 15: SO-8 tape and reel dimensions
Table 12: SO-8 tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A
-
330
C
12.8
13.2
D
20.2
N
60
T
22.4
Ao
8.1
8.5
Bo
5.5
5.9
Ko
2.1
2.3
Po
3.9
4.1
P
7.9
8.1
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Package information
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6.3 TO-92 packing information
Figure 16: TO-92 tape and reel outline
Package information
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Table 13: TO-92 tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A1
4.80
T
3.80
T1
1.60
T2
2.30
d
0.45
0.47
0.48
P0
12.50
12.70
12.90
P2
5.65
6.35
7.05
F1, F2
2.40
2.50
2.94
F3
4.98
5.08
5.48
delta H
-2.00
2.00
W
17.50
18.00
19.00
W0
5.5
6.00
6.5
W1
8.50
9.00
9.25
W2
0.50
H
18.50
21
H3
0.5
1
2
H0
15.50
16.00
18.8
H1
25.0
27.0
D0
3.80
4.00
4.20
t
0.90
L
11.00
I1
3.00
delta P
-1.00
1.00
Ø1
352
355
358
Ø2
28
30
32
u
44
47
50
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Package information
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6.4 TO-92 Ammopak packing information
Figure 17: TO-92 Ammopak tape and reel outline
Package information
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Table 14: TO-92 Ammopak tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A1
4.80
T
3.80
T1
1.60
T2
2.30
d
0.45
0.47
0.48
P0
12.50
12.70
12.90
P2
5.65
6.35
7.05
F1, F2
2.40
2.50
2.94
F3
4.98
5.08
5.48
delta H
-2.00
2.00
W
17.50
18.00
19.00
W0
5.5
6.00
6.5
W1
8.50
9.00
9.25
W2
0.50
H
18.50
21
H3
0.5
1
2
H0
15.50
16.00
18.8
H1
25.0
27.0
D0
3.80
4.00
4.20
t
0.90
L
11.00
I1
3.00
delta P
-1.00
1.00
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Revision history
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7 Revision history
Table 15: Document revision history
Date
Revision
Changes
09-Jul-2004
6
IO typ. and max. are changed in tab. 24 and 25 - pag. 14.
16-Mar-2005
7
Add Tape & Reel for TO-92 - Note on Table 3.
12-Feb-2007
8
Change value TOP on Table 2.
26-Jul-2007
9
Add Table 1 in cover page.
29-Nov-2007
10
Modified: Table 25.
12-Feb-2008
11
Modified: Table 25.
10-Jul-2008
12
Modified: Table 1 and Table 25.
22-May-2012
13
Updated: Table 1 on page 1. Changed: TA in TJ test conditions from table
4 to table 10.
14-Mar-2014
14
Changed the part numbers LExxAB and LExxC to LEXX. Updated the
title. Added the ammopack package to the figure in cover page. Updated
the Table 1: Device summary. Updated the Description. Updated Figure
3. Changed the title of Figure 6. Updated mechanical data.
03-May-2017
15
Updated Table 1: "Device summary" and Section 6: "Package
information".
Minor text changes.
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