LEXX
Very low-dropout voltage regulator with inhibit function
Datasheet - production data
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.
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
Order code
Table 1: Device summary
Output voltage (V)
SO-8
LE30CD-TR
LE33CD-TR
LE45CD-TR
LE50ABD-TR
LE50CD-TR
LE80CD-TR
LE33ABZ-AP
LE33CZ-AP
LE33CZ-TR
TO-92 (Ammopack)
TO-92 (tape and reel)
3
3.3
4.5
5
5
8
May 2017
DocID2573 Rev 15
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www.st.com
This is information on a product in full production.
Contents
LEXX
Contents
1
2
3
4
5
6
Diagram ............................................................................................ 3
Pin configuration ............................................................................. 4
Maximum ratings ............................................................................. 5
Electrical characteristics ................................................................ 6
Typical performance characteristics ........................................... 13
Package information ..................................................................... 16
6.1
6.2
6.3
6.4
SO-8 package information .............................................................. 16
SO-8 packing information ................................................................ 18
TO-92 packing information .............................................................. 19
TO-92 Ammopak packing information ............................................. 21
7
Revision history ............................................................................ 23
2/24
DocID2573 Rev 15
LEXX
Maximum
ratings
3
Maximum ratings
Table 2: Absolute maximum ratings
Symbol
V
I
I
O
P
TOT
T
STG
T
OP
Notes:
(1)
Our
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
Unit
V
°C
°C
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
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Figure 3: Test circuit
SO-8
20
55
200
TO-92
Unit
°C/W
°C/W
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.
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