LD1117D33 STMicroelectronics, LD1117D33 Datasheet - Page 25
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LD1117D33
Manufacturer Part Number
LD1117D33
Description
IC REG LDO POS 800MA 3.3V 8-SOIC
Manufacturer
STMicroelectronics
Datasheet
1.LD1117S33CTR.pdf
(42 pages)
Specifications of LD1117D33
Regulator Topology
Positive Fixed
Voltage - Output
3.3V
Voltage - Input
Up to 15V
Voltage - Dropout (typical)
1.1V @ 800mA
Number Of Regulators
1
Current - Output
950mA
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
497-1488-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LD1117D33C-TR
Manufacturer:
ST
Quantity:
20 000
Part Number:
LD1117D33TR
Manufacturer:
ST
Quantity:
20 000
LD1117xx
7
Figure 11. Adjustable output voltage application
Figure 12. Adjustable output voltage application with improved ripple rejection
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
= V
= V
and R
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 29
REF
Figure 10
+ R
1
connection must be realized very close to OUT and
Figure
2
(I
ADJ
we obtain:
11).
+V
REF
LD1117 adjustable: application note
/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
2
x I
25/42
ADJ
.