LExxAB
LExxC
Very low drop voltage regulators with inhibit
Features
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Very low dropout voltage (0.2V 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; 1.5; 2.5; 3; 3.3; 3.5; 4;
4.5; 4.7; 5; 5.2; 5.5; 6; 8V
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: 80db (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 (0.2V) 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 2.2µF capacitor for stability allowing
room and cost saving effect.
Order codes
LE12C
LE15AB
LE15C
LE25AB
LE27AB
LE30C
July 2007
LE33AB
LE33C
LE35AB
LE35C
LE40C
LE45AB
Rev. 9
LE45C
LE47AB
LE50AB
LE50C
LE52AB
LE52C
1/48
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48
LE55AB
LE55C
LE80AB
LE80C
LExxAB LExxC
Contents
1
2
3
4
5
6
7
8
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Order codes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
2/48
LExxAB LExxC
Maximum ratings
3
Table 2.
Maximum ratings
Absolute maximum ratings
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
20
Internally Limited
(1)
Internally Limited
-65 to 150
-40 to 125
°C
°C
Unit
V
Symbol
V
I
I
O
P
TOT
T
STG
T
OP
1. Our SO-8 package used for Voltage Regulators is modified internally to have pins 2, 3, 6 and 7 electrically communed to
the die attach flag. This particular 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 for the standard SO-8.
Table 3.
Symbol
R
thJC
R
thJA
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
SO-8
20
55
200
TO-92
Unit
°C/W
°C/W
Figure 3.
Test circuit
Note:
If the Inhibit pin is left floating, the regulator is in ON mode. However, to avoid any noise
picking-up, it is suggested to ground it when the Inhibit function is not used.
5/48
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