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LD1117ADT12TR
Low drop fixed and adjustable positive voltage regulators
July 2013 DocID7194 Rev 26 1/24
LD1117ALow drop fixed and adjustable positive voltage regulators
Datasheet - production data
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 Fixed output voltage of: 1.2 V, 1.8 V, 3.3 V Adjustable version availability (V REF = 1.25 V) Internal current and thermal limit Only 10 µF for stability 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
DescriptionThe 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.
Table 1. Device summary
Contents LD1117A2/24 DocID7194 Rev 26
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 LD1117A adjustable: application note . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3/24
LD1117A Diagram
1 Diagram
Figure 1. Block diagram
Pin configuration LD1117A4/24 DocID7194 Rev 26
Pin configuration Note: The TAB is connected to the VOUT.
Figure 2. Pin connections (top view)
DocID7194 Rev 26 5/24
LD1117A Maximum ratings
3 Maximum ratings 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 2. Absolute maximum ratings
Table 3. Thermal data
Schematic application LD1117A6/24 DocID7194 Rev 26
4 Schematic application
Figure 3. Application circuit (for fixed output voltages)
DocID7194 Rev 26 7/24
LD1117A Electrical characteristics
5 Electrical characteristicsRefer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF , R = 120 Ω between OUT-
GND, unless otherwise specified.
Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF , CI = 10 µF , unless otherwise
specified.
Table 4. Electrical characteristics of LD1117A#12
Table 5. Electrical characteristics of LD1117A#18
Electrical characteristics LD1117A8/24 DocID7194 Rev 26
Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF, unless otherwise
specified.
Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF, unless otherwise
specified.
Table 5. Electrical characteristics of LD1117A#18 (continued)
Table 6. Electrical characteristics of LD1117A#33
Table 7. Electrical characteristics of LD1117A (adjustable)
DocID7194 Rev 26 9/24
LD1117A Electrical characteristics
Table 7. Electrical characteristics of LD1117A (adjustable) (continued)
Typical application LD1117A10/24 DocID7194 Rev 26
6 Typical application
Figure 4. Negative supply
Figure 5. Circuit for increasing output voltage
Figure 6. Voltage regulator with reference
DocID7194 Rev 26 11/24
LD1117A Typical application
Figure 7. Post-regulated dual supply
LD1117A adjustable: application note LD1117A12/24 DocID7194 Rev 26
LD1117A adjustable: application noteThe LD1117A adjustable has a thermal stabilized 1.25 ± 0.012 V reference voltage between
the OUT and ADJ pins. IADJ is 60 µA typ. (120 µA max.) and ΔIADJ is 1 µA typ. (5 µA max.).
R1 is normally fixed to 120 Ω. From Figure 6 the following is obtained:
VOUT = VREF + R2 (IADJ + IR1) = VREF + R2 (IADJ +VREF /R1) = VREF (1 + R2 / R1) + R2 x
IADJ.
In normal applications the R2 value is in the range of a few kΩ, so the R2 x IADJ product can
not be considered in the VOUT calculation; the above expression then becomes:
VOUT = VREF (1 + R2 / R1).
In order to have a better load regulation it is important to realize a good Kelvin connection of
R1 and R2 resistors. In particular, the R1 connection must be realized very close to the OUT
and ADJ pins, while the R2 ground connection must be placed as near as possible to the
negative load pin. Ripple rejection can be improved by introducing a 10 µF electrolytic
capacitor placed in parallel to the R2 resistor (see Figure 8).
Figure 8. Adjustable output voltage application
Figure 9. Adjustable output voltage application with improved ripple rejection
