LD1117XX33C STMicroelectronics, LD1117XX33C Datasheet - Page 24
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LD1117XX33C
Manufacturer Part Number
LD1117XX33C
Description
LOW DROP FIXED POSITIVE VOLTAGE REGULATOR
Manufacturer
STMicroelectronics
Datasheet
1.LD1117XX18.pdf
(41 pages)
Specifications of LD1117XX33C
Fixed Output Voltage Of
1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V
Supply Voltage Rejection
75 dB (typ.)
LD1117 adjustable: application note
7
Figure 11. Adjustable output voltage application
Figure 12. Adjustable output voltage application with improved ripple rejection
24/41
LD1117 adjustable: application note
The LD1117 adjustable has a thermal stabilized 1.25 ± 0.012 V reference voltage between
the OUT and ADJ pins. I
R
V
In normal application R
be considered in the V
V
In order to have the better load regulation it is important to realize a good Kelvin connection
of R
ADJ pin, while R
Load pin. Ripple rejection can be improved by introducing a 10 µF electrolytic capacitor
placed in parallel to the R
OUT
OUT
1
is normally fixed to 120 Ω. From
1
and R
= V
= V
REF
REF
2
+ R
resistors. In particular R
(1 + R
2
2
ground connection must be placed as near as possible to the negative
(I
2
ADJ
/ R
OUT
2
+I
1
ADJ
value is in the range of few kΩ, so the R
).
2
R1
calculation; then the above expression becomes:
resistor (see
) = V
is 60 µA typ. (120 µA max.) and ΔI
Doc ID 2572 Rev 31
REF
Figure 10
+ R
1
connection must be realized very close to OUT and
Figure 11
2
(I
ADJ
we obtain:
+V
).
REF
/R
1
) = V
ADJ
REF
2
x I
is 1 µA typ. (5 µA max.).
(1 + R
ADJ
product could not
2
/ R
1
) + R
LD1117xx
2
x I
ADJ
.