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: 80db (typ.)
■
TO-92
Temperature range: -40 to 125 °C
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.
SO-8
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.
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
Part numbers
LE12C
LE35C
LE50C
LE25AB
LE35AB
LE50AB
LE27AB
LE40C
LE55C
LE30C
LE45C
LE80C
LE33C
LE45AB
LE80AB
LE33AB
LE47AB
November 2007
Rev 10
1/40
www.st.com
40
