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PDF LD39050 Data sheet ( Hoja de datos )
| Número de pieza | LD39050 | |
| Descripción | 500mA low quiescent current and low noise voltage regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LD39050
500 mA low quiescent current and low noise voltage regulator
')1 [PP
')1 [PP
Features
• Input voltage from 1.5 to 5.5 V
• Ultra low-dropout voltage (200 mV typ. at 500
mA load)
• Very low quiescent current (20 µA typ. at no
load, 100 µA typ. at 500 mA load, 1 µA max. in
OFF mode)
• Very low noise without bypass capacitor
• Output voltage tolerance: ± 2.0% @ 25 °C
• 500 mA guaranteed output current
• Wide range of output voltages available on
request: 0.8 V to 4.5 V with 100 mV step and
adjustable from 0.8 V
• Logic-controlled electronic shutdown
• Compatible with ceramic capacitor COUT = 1 µF
• Internal current and thermal limit
• Package DFN6 (3x3 mm) and DFN6 (2x2 mm)
• Temperature range: from -40 °C to 125 °C
Datasheet - production data
Description
The LD39050 provides 500 mA maximum current
with an input voltage range from 1.5 V to 5.5 V
and a typical dropout voltage of 200 mV. Stability
is given by ceramic capacitors. The ultra low drop
voltage, low quiescent current and low noise
features make it suitable for low power battery-
powered applications. Power supply rejection is
65 dB at low frequencies and starts to roll off at 10
kHz. The enable logic control function puts the
LD39050 in shutdown mode allowing a total
current consumption lower than 1 µA. The device
also includes short-circuit constant current limiting
and thermal protection. Typical applications are
mobile phones, hard disks and battery-powered
systems.
October 2015
This is information on a product in full production.
DocID15470 Rev 3
1/28
www.st.com
1 page  
LD39050
Pin configuration
Symbol
Pin n° for
DFN6 (3x3 mm)
LD39050 LD39050
(adjustable) (fixed)
EN
GND
PG
VOUT
ADJ
VIN
N.C.
GND
11
22
33
44
5-
66
-5
Exposed pad
Table 1. Pin description
Pin n° for
DFN6 (2x2 mm)
LD39050 LD39050
(adjustable) (fixed)
Function
Enable pin logic input: low = shutdown,
22
high = active
3 3 Common ground
4 4 Power Good
5 5 Output voltage
6 - Adjustable pin
1 1 Input voltage of the LDO
- 6 Not connected
Exposed pad
Exposed pad must be connected to GND
DocID15470 Rev 3
5/28
28
5 Page 
LD39050
Typical performance characteristics
5 Typical performance characteristics
0.85
0.84
0.83
0.82
0.81
0.8
0.79
0.78
0.77
0.76
0.75
-50
Figure 5. VADJ accuracy
VIN = 1.8 V IOUT = 10 mA VEN = VIN
-25 0
25 50 75
T [°C]
100
125 150
Figure 7. Dropout voltage vs. temperature
(VOUT = 1.5 V)
350
300
250
200
150
100
50
0
-50
-25
VEN to VIN, IOUT = 500 mA, VOUT @ 1.5 V
CIN = COUT = 1 µF
0 25 50 75 100
T [°C]
125
150
2.55
2.54
2.53
2.52
2.51
2.5
2.49
2.48
2.47
2.46
2.45
-50
Figure 6. VOUT accuracy
VIN = 3.5 V IOUT = 10 mA VEN = VIN
-25 0
25 50 75 100 125
T [°C]
150
Figure 8. Dropout voltage vs. temperature
(VOUT = 2.5 V)
350
300
250
200
150
100
50
0
-50
-25
VEN to VIN, IOUT = 500 mA, VOUT = 2.5 V
CIN = COUT = 1 µF
0 25 50 75 100
T [°C]
125
150
Figure 9. Dropout voltage vs. output current
0.3
0.275
0.25
0.225
0.2
0.175
0.15
0.125
0.1
0.075
0.05
0.025
0
0
VEN to VIN, CIN = COUT = 1 µF
100 200 300 400 500 600
IOUT [mA]
Figure 10. Short-circuit current vs. dropout
voltage
1.2
1.1 125 °C
1 85 °C
0.9 55 °C
0.8
0.7
25 °C
0.6 0 °C
0.5 -25 °C
0.4
0.3
-40 °C
0.2
0.1
VIN from 0 to 5.5 V, VEN = VIN, CIN = 1 µF, COUT = 1 µF
0
0 12 34 56
VDROP [V]
DocID15470 Rev 3
11/28
28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LD39050.PDF ] | |
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