Datasheet

LD39100XX, LD39100XX12, LD39100XX25 Application information
Doc ID 15676 Rev 3 15/23
6 Application information
The LD39100xx is an ultra low dropout linear regulator. It provides up to 1 A 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 stable due to 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 32 and Figure 33 illustrate the typical application schematics:
Figure 32. Typical application circuit for the fixed output version
IN
GND
V
IN
EN
PG
V
OUT
V
OUT
C
OUT
NC
6
1
2
5
4
3
V
OFF ON
C
IN
LD39100PUxx
IN
GND
V
IN
EN
PG
V
OUT
V
OUT
C
OUT
NC
6
1
2
5
4
3
V
OFF ON
C
IN
LD39100PUxx
Figure 33. Typical application circuit for the adjustable version
V
IN
GND
V
IN
EN
OFF ON
C
IN
ADJ
PG
V
OUT
V
OUT
C
OUT
R
1
R
2
LD39100PU
6
1
2
5
4
3
V
IN
GND
V
IN
EN
OFF ON
C
IN
ADJ
PG
V
OUT
V
OUT
C
OUT
R
1
R
2
LD39100PU
6
1
2
5
4
3