ld39050xx12 STMicroelectronics, ld39050xx12 Datasheet - Page 15

• Manufacturer Part Number: ld39050xx12
• Description: 500 Ma Low Quiescent Current Low Noise Voltage Regulator
• Manufacturer: STMicroelectronics

6
Figure 34. Application schematic for fixed version
Figure 35. Application schematic for adjustable version
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
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
V
V
V
V
V
V
IN
IN
C
C
1µF
1µF
I
IN
I
IN
C
C
1µF
1µF
IN
IN
IN
IN
and
OFF ON
OFF ON
OFF ON
OFF ON
Figure 35
6
6
1
1
6
6
1
1
illustrate the typical application schematics:
EN
EN
V
V
EN
EN
V
V
IN
IN
IN
IN
LD39050PU
LD39050PU
LD39050PUxx
LD39050PUxx
GND
GND
2
2
GND
GND
2
2
V
V
ADJ
ADJ
V
V
PG
PG
OUT
OUT
PG
PG
NC
NC
OUT
OUT
4
4
5
5
3
3
4
4
3
3
5
5
R
R
R
R
1
1
2
2
C
C
V
V
C
C
1µF
1µF
V
V
OUT
OUT
1µF
1µF
OUT
OUT
OUT
OUT
OUT
OUT
IN
terminal.
15/24