Datasheet

LD39050xx Application information
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6 Application information
The LD39050 is an ultra low dropout linear regulator. It provides up to 500 mA with a low
200 mV dropout. The input voltage range is from 1.5 V to 5.5 V. The device is available in
fixed and adjustable output versions.
The regulator is equipped with internal protection circuitry, such as short-circuit current
limiting and thermal protection.
The regulator is designed to be stable with ceramic capacitors on the input and the output.
The expected values of the input and output ceramic capacitors are from 1 µF to 22 µF with
1 µF typical. The input capacitor must be connected within 0.5 inches of the V
IN
terminal.
The output capacitor must also be connected within 0.5 inches of output pin. There is no
upper limit to the value of the input capacitor.
Figure 34 and Figure 35 illustrate the typical application schematics:
Figure 34. Application schematic for fixed version
V
IN
GND
V
IN
EN
OFF ON
C
IN
PG
V
OUT
V
OUT
C
OUT
LD39050PUxx
NC
6
1
2
5
4
3
1µF
1µF
V
IN
GND
V
IN
EN
OFF ON
C
IN
PG
V
OUT
V
OUT
C
OUT
LD39050PUxx
NC
6
1
2
5
4
3
1µF
1µF
Figure 35. Application schematic for adjustable version
V
I
GND
V
EN
OFF ON
ADJ
PG
V
R
1
R
2
LD39050PU
6
1
2
5
4
3
V
IN
IN
C
IN
V
OUT
OUT
C
OUT
1µF
1µF
V
I
GND
V
EN
OFF ON
ADJ
PG
V
R
1
R
2
LD39050PU
6
1
2
5
4
3
V
IN
IN
C
IN
V
OUT
OUT
C
OUT
1µF
1µF