LExxAB
LExxC
Very low drop voltage regulators with inhibit
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 of 1.25; 2.5; 2.7; 3; 3.3; 3.5; 4;
4.5; 4.7; 5; 5.5; 8 V
Internal current and thermal limit
Only 2.2 µF 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
TO-92
SO-8
Description
The LExxAB and LExxC are very low drop voltage
regulators available in SO-8 and TO-92 packages
and in a wide range of output voltages.
The very low drop voltage (0.2 V) and the very low
quiescent current make them particularly suitable
for low noise low power applications and specially
in battery powered systems.
They are pin to pin compatible with the older
L78Lxx series. Furthermore in the 8 pin
configuration (SO-8) they employ a shutdown
logic control (pin 5, TTL compatible). This means
that when the device is used as a local regulator,
Table 1.
Device summary
it’s possible to put in stand by a part of the board
even more decreasing the total power
consumption. In the three terminal configuration
(TO-92) the device is even in ON STATE,
maintaining the same electrical performances. It
needs only 2.2 µF capacitor for stability allowing
room and cost saving effect.
Part numbers
LE12C
LE25AB
LE27AB
LE30C
LE33C
LE33AB
February 2008
LE35C
LE35AB
LE40C
LE45C
LE45AB
LE47AB
Rev 11
1/40
www.st.com
40
LE50C
LE50AB
LE55C
LE80C
LE80AB
LExxAB LExxC
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connections (top view for SO-8, bottom view for TO-92) . . . . . . . . . . . . . . . . . . . . . . . . 6
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Dropout voltage vs output current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Dropout voltage vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Supply current vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Supply current vs input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Short circuit current vs dropout voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
S.V.R. vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Logic controlled precision 3.3/5.0 V selectable output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Sequential multi-output supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Multiple supply with ON/OFF toggle switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Basic inhibit functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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List of tables
LExxAB LExxC
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
Table 23.
Table 24.
Table 25.
Table 27.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics for LE12AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical characteristics for LE12C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical characteristics for LE25AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical characteristics for LE25C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical characteristics for LE27AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical characteristics for LE27C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical characteristics for LE30AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical characteristics for LE30C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electrical characteristics for LE33AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical characteristics for LE33C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electrical characteristics for LE35AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical characteristics for LE35C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical characteristics for LE40AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical characteristics for LE40C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electrical characteristics for LE45AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Electrical characteristics for LE45C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electrical characteristics for LE47AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Electrical characteristics for LE47C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Electrical characteristics for LE50AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Electrical characteristics for LE50C (rrefer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Electrical characteristics for LE80AB (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Electrical characteristics for LE80C (refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF,
C
O
= 2.2 µF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
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