LD1117AV33 STMicroelectronics, LD1117AV33 Datasheet - Page 9

• Manufacturer Part Number: LD1117AV33
• Description: IC REG LDO POS 1A 3.3V TO-220
• Manufacturer: STMicroelectronics

Specifications of LD1117AV33

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V
• Voltage - Input: Up to 15V
• Voltage - Dropout (typical): 1.15V @ 1A
• Number Of Regulators: 1
• Current - Output: 1.2A
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-3 (Straight Leads)
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 15 V
• Output Voltage: 3.3 V
• Output Type: Fixed
• Dropout Voltage (max): 1.3 V
• Output Current: 1000 mA
• Line Regulation: 6 mV
• Load Regulation: 10 mV
• Voltage Regulation Accuracy: 2 %
• Maximum Power Dissipation: 12 W
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: 0 C
• Primary Input Voltage: 5.3V
• Output Voltage Fixed: 3.3V
• Dropout Voltage Vdo: 1.1V
• No. Of Pins: 3
• Voltage Regulator Case Style: TO-220
• Operating Temperature Range: 0°C To +125°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-1485-5

Figure 9: Post-Regulated Dual Supply
LD1117A ADJUSTABLE: APPLICATION NOTE
The LD1117A ADJUSTABLE has a thermal
stabilized 1.25±0.012V reference voltage between
the OUT and ADJ pins. I
max.) and ∆I
R1 is normally fixed to 120Ω. From figure 7 we
obtain:
V
+V
In normal application R2 value is in the range of
few Kohm, so the R2 x I
OUT
REF
= V
/R1) = V
REF
ADJ
+ R2 (I
REF
is 1µA typ. (5µA max.).
(1 + R2 / R1) + R2 x I
ADJ
+ I
ADJ
DJ
R1
product could not be
is 60µA typ. (120µA
) = V
REF
+ R2 (I
ADJ
.
ADJ
considered in the V
above expression becomes:
V
In order to have the better load regulation it is
important to realize a good Kelvin connection of
R1 and R2 resistors. In particular R1 connection
must be realized very close to OUT and ADJ pin,
while R2 ground connection must be placed as
near as possible to the negative Load pin. Ripple
rejection can be improved by introducing a 10µF
electrolytic capacitor placed in parallel to the R2
resistor (see Fig. 10).
OUT
= V
REF
(1 + R2 / R1).
OUT
calculation; then the
LD1117A SERIES
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