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PDF LD1117A Data sheet ( Hoja de datos )
| Número de pieza | LD1117A | |
| Descripción | Low drop fixed and adjustable positive voltage regulators | |
| Fabricantes | ST Microelectronics | |
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LD1117A
Low drop fixed and adjustable positive voltage regulators
Datasheet - production data
SOT-223
• Available in ± 2% (at 25 °C) and 4% in full
temperature range
• High supply voltage rejection:
– 80 dB typ. (at 25 °C)
• Temperature range: 0 °C to 125 °C
TO-220
Description
DPAK
Features
• Low dropout voltage:
– 1.15 V typ. @ IOUT = 1 A, 25 °C
• Very low quiescent current:
– 5 mA typ. @ 25 °C
• Output current up to 1 A
The LD1117A is a low drop voltage regulator able
to provide up to 1 A of output current, available
also in adjustable versions (VREF = 1.25 V). In
fixed versions, the following output voltages are
offered: 1.2 V, 1.8 V, and 3.3 V. The device is
supplied in: SOT-223, DPAK and TO-220. Surface
mounted packages optimize the thermal
characteristics while offering a relevant space
saving advantage. High efficiency is assured by
an NPN pass transistor. Only a very common 10
µF minimum capacitor is needed for stability. Chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within ± 2% at 25 °C.
• Fixed output voltage of:
– 1.2 V, 1.8 V, 3.3 V
• Adjustable version availability (VREF = 1.25 V)
• Internal current and thermal limit
• Only 10 µF for stability
Table 1. Device summary
SOT-223
Order codes
DPAK
TO-220
Output voltage
LD1117AS12TR
LD1117AS18TR
LD1117AS33TR
LD1117ASTR
LD1117ADT12TR
LD1117ADT18TR
LD1117ADT33TR
LD1117ADT-TR
LD1117AV33
1.2 V
1.8 V
3.3 V
Adjustable from 1.25 V
July 2013
This is information on a product in full production.
DocID7194 Rev 26
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www.st.com
1 page  
LD1117A
3 Maximum ratings
Maximum ratings
Symbol
VIN
PD
TSTG
TOP
Table 2. Absolute maximum ratings
Parameter
DC input voltage
Power dissipation
Storage temperature range
Operating junction temperature range
Value
15
12
-40 to +150
0 to +125
Unit
V
W
°C
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied. Beyond the above suggested
max. power dissipation, a short-circuit may permanently damage the device.
Table 3. Thermal data
Symbol
Parameter
SOT-223
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
15
110
DPAK
8
100
TO-220
5
50
Unit
°C/W
°C/W
DocID7194 Rev 26
5/24
24
5 Page 
LD1117A
Figure 7. Post-regulated dual supply
Typical application
VOUT1
LD1117A
LD1117A
VOUT2 = VOUT(NOM)
0.5 A
VOUT3 = -VOUT(NOM)
0.5 A
DocID7194 Rev 26
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LD1117A.PDF ] | |
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