LD1117A
SERIES
LOW DROP FIXED AND ADJUSTABLE
POSITIVE VOLTAGE REGULATORS
s
s
s
s
s
s
s
s
s
s
LOW DROPOUT VOLTAGE
(1.15V TYP. @ I
OUT
= 1A, 25°C)
VERY LOW QUIESCENT CURRENT
(5 mA TYP. @ 25°C)
OUTPUT CURRENT UP TO 1A
FIXED OUTPUT VOLTAGE OF: 1.2V, 1.8V,
2.5V, 2.85V, 3.3V, 5.0V
ADJUSTABLE VERSION AVAILABILITY
(V
rel
= 1.25V)
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:
(80dB TYP. AT 25°C)
TEMPERATURE RANGE: 0°C TO 125°C
SOT-223
TO-220
DPAK
DESCRIPTION
The LD1117A is a LOW DROP Voltage Regulator
able to provide up to 1A of Output Current,
available even in adjustable version (Vref=1.25V).
Concerning fixed versions, are offered the
following Output Voltages: 1.2V, 1.8V, 2.5V,
2.85V, 3.3V and 5.0V. The 2.85V type is ideal for
SCSI-2 lines active termination. The device is
Figure 1: Block Diagram
supplied in: SOT-223, DPAK and TO-220. The
surface mount packages optimize the thermal
characteristics even offering a relevant space
saving effect. High efficiency is assured by NPN
pass transistor. Only a very common 10µF
minimum capacitor is needed for stability. Only
chip trimming allows the regulator to reach a very
tight output voltage tolerance, within ± 2% at 25°C.
October 2004
Rev. 12
1/17
LD1117A SERIES
Table 1: Absolute Maximum Ratings
Symbol
V
IN
P
tot
T
stg
T
op
DC Input Voltage
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
Parameter
Value
10
12
-40 to +150
0 to +125
Unit
V
W
°C
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied. Over the above suggested Max Power Dissipation a Short Circuit could definitively damage the device.
Table 2: Thermal Data
Symbol
R
thj-case
R
thj-amb
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
TO-220
3
50
SOT-223
15
DPAK
8
Unit
°C/W
°C/W
Figure 2: Pin Connection
(top view)
DPAK
SOT-223
TO-220
NOTE: The TAB is connected to the V
OUT
.
Table 3: Order Codes
SOT-223
LD1117AS12TR
LD1117AS18TR
LD1117AS25TR
LD1117AS28TR
LD1117AS33TR
LD1117AS50TR
LD1117AST-R
DPAK
LD1117ADT12TR
LD1117ADT18TR
LD1117ADT25TR
LD1117ADT28TR
LD1117ADT33TR
LD1117ADT50TR
LD1117ADT-R
TO-220
LD1117AV12
LD1117AV18
LD1117AV25
LD1117AV28
LD1117AV33
LD1117AV50
LD1117AV
OUTPUT VOLTAGE
1.2 V
1.8 V
2.5 V
2.85 V
3.3 V
5V
ADJUSTABLE FROM 1.25
TO 15 V
2/17
LD1117A SERIES
Figure 3: Application Circuit
(For Other Fixed Output Voltages)
Table 4: Electrical Characteristics Of LD1117A#12
(refer to the test circuits, T
J
= 0 to 125°C, C
O
= 10
µF, C
I
= 10 µF, R = 120
Ω
between OUT-GND, unless otherwise specified)
Symbol
V
O
V
O
∆V
O
∆V
O
∆V
O
∆V
O
V
I
I
d
I
O
eN
SVR
V
D
Parameter
Output Voltage
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Long Term Stability
Operating Input Voltage
Quiescent Current
Output Current
Output Noise Voltage
Supply Voltage Rejection
Dropout Voltage
1000 hrs, T
J
= 125°C
I
O
= 100 mA
V
I
≤
8 V
I
O
= 0 mA
1000
T
J
= 25°C
60
V
I
- V
O
= 5 VT
J
= 25°C
B =10Hz to 10KHz
I
O
= 40 mA f = 120Hz
V
I
- V
O
= 3 VV
ripple
= 1 V
PP
I
O
= 100 mA
I
O
= 500 mA
I
O
= 1 A
∆V
O(pwr)
Thermal Regulation
T
a
= 25°C 30ms Pulse
I
O
= 0 to 1 A
V
I
= 2.75 to 8 V
V
I
= 2.75 V
Test Conditions
V
I
= 5.3 V I
O
= 10 mA
T
J
= 25°C
V
I
= 2.75 to 10 V
I
O
= 0 mA
I
O
= 0 to 1 A
Min.
1.176
1.152
Typ.
1.2
1.2
1
1
0.5
0.3
10
5
1200
100
80
1
1.05
1.15
0.08
1.10
1.15
1.30
0.2
%/W
10
Max.
1.224
1.248
6
10
Unit
V
V
mV
mV
%
%
V
mA
mA
µV
dB
V
3/17
LD1117A SERIES
Table 5: Electrical Characteristics Of LD1117A#18
(refer to the test circuits, T
J
= 0 to 125°C,
C
O
= 10 µF, C
I
= 10 µF unless otherwise specified)
Symbol
V
O
V
O
∆V
O
∆V
O
∆V
O
∆V
O
V
I
I
d
I
O
eN
SVR
V
D
Parameter
Output Voltage
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Long Term Stability
Operating Input Voltage
Quiescent Current
Output Current
Output Noise Voltage
Supply Voltage Rejection
Dropout Voltage
1000 hrs, T
J
= 125°C
I
O
= 100 mA
V
I
≤
8 V
I
O
= 0 mA
1000
T
J
= 25°C
60
100
80
1
1.05
1.15
0.08
1.10
1.15
1.30
0.2
%/W
V
I
- V
O
= 5 VT
J
= 25°C
B =10Hz to 10KHz
I
O
= 40 mA f = 120Hz
V
I
- V
O
= 3 VV
ripple
= 1 V
PP
I
O
= 100 mA
I
O
= 500 mA
I
O
= 1 A
∆V
O(pwr)
Thermal Regulation
T
a
= 25°C 30ms Pulse
I
O
= 0 to 1 A
V
I
= 3.3 to 8 V
V
I
= 3.3 V
Test Conditions
V
I
= 3.8 V I
O
= 10 mA
T
J
= 25°C
V
I
= 3.3 to 8 V
I
O
= 0 mA
I
O
= 0 to 1 A
Min.
1.764
1.728
1
1
0.5
0.3
10
5
10
Typ.
1.8
Max.
1.836
1.872
6
10
Unit
V
V
mV
mV
%
%
V
mA
mA
µV
dB
V
Table 6: Electrical Characteristics Of LD1117A#25
(refer to the test circuits, T
J
= 0 to 125°C,
C
O
= 10 µF, C
I
= 10 µF unless otherwise specified)
Symbol
V
O
V
O
∆V
O
∆V
O
∆V
O
∆V
O
V
I
I
d
I
O
eN
SVR
V
D
Parameter
Output Voltage
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Long Term Stability
Operating Input Voltage
Quiescent Current
Output Current
Output Noise Voltage
Supply Voltage Rejection
Dropout Voltage
1000 hrs, T
J
= 125°C
I
O
= 100 mA
V
I
≤
10 V
I
O
= 0 mA
1000
T
J
= 25°C
60
V
I
- V
O
= 5 VT
J
= 25°C
B =10Hz to 10KHz
I
O
= 40 mA f = 120Hz
V
I
- V
O
= 3 VV
ripple
= 1 V
PP
I
O
= 100 mA
I
O
= 500 mA
I
O
= 1 A
∆V
O(pwr)
Thermal Regulation
T
a
= 25°C 30ms Pulse
I
O
= 0 to 1 A
V
I
= 3.9 to 8 V
V
I
= 3.9 V
Test Conditions
V
I
= 4.5 V I
O
= 10 mA
T
J
= 25°C
V
I
= 3.9 to 8 V
I
O
= 0 mA
I
O
= 0 to 1 A
Min.
2.45
2.4
1
1
0.5
0.3
10
5
1200
100
80
1
1.05
1.15
0.08
1.10
1.15
1.30
0.2
%/W
10
Typ.
2.5
Max.
2.55
2.6
6
10
Unit
V
V
mV
mV
%
%
V
mA
mA
µV
dB
V
4/17
LD1117A SERIES
Table 7: Electrical Characteristics Of LD1117A#28
(refer to the test circuits, T
J
= 0 to 125°C,
C
O
= 10 µF, C
I
= 10 µF unless otherwise specified)
Symbol
V
O
V
O
∆V
O
∆V
O
∆V
O
∆V
O
V
I
I
d
I
O
eN
SVR
V
D
Parameter
Output Voltage
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Long Term Stability
Operating Input Voltage
Quiescent Current
Output Current
Output Noise Voltage
Supply Voltage Rejection
Dropout Voltage
1000 hrs, T
J
= 125°C
I
O
= 100 mA
V
I
≤
10 V
I
O
= 0 mA
1000
T
J
= 25°C
60
V
I
- V
O
= 5 VT
J
= 25°C
B =10Hz to 10KHz
I
O
= 40 mA f = 120Hz
V
I
- V
O
= 3 VV
ripple
= 1 V
PP
I
O
= 100 mA
I
O
= 500 mA
I
O
= 1 A
∆V
O(pwr)
Thermal Regulation
T
a
= 25°C 30ms Pulse
Test Conditions
V
I
= 4.85 V I
O
= 10 mA
T
J
= 25°C
I
O
= 0 to 1 A
V
I
= 4.25 to 10 V
V
I
= 4.25 to 8 V
V
I
= 4.25 V
I
O
= 0 mA
I
O
= 0 to 1 A
Min.
2.793
2.736
1
1
0.5
0.3
10
4.5
1200
100
75
1
1.05
1.15
0.08
1.10
1.15
1.30
0.2
%/W
10
Typ.
2.85
Max.
2.907
2.964
6
10
Unit
V
V
mV
mV
%
%
V
mA
mA
µV
dB
V
Table 8: Electrical Characteristics Of LD1117A#33
(refer to the test circuits, T
J
= 0 to 125°C,
C
O
= 10 µF, C
I
= 10 µF unless otherwise specified)
Symbol
V
O
V
O
∆V
O
∆V
O
∆V
O
∆V
O
V
I
I
d
I
O
eN
SVR
V
D
Parameter
Output Voltage
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Long Term Stability
Operating Input Voltage
Quiescent Current
Output Current
Output Noise Voltage
Supply Voltage Rejection
Dropout Voltage
1000 hrs, T
J
= 125°C
I
O
= 100 mA
V
I
≤
10 V
I
O
= 0 mA
1000
T
J
= 25°C
60
V
I
- V
O
= 5 VT
J
= 25°C
B =10Hz to 10KHz
I
O
= 40 mA f = 120Hz
V
I
- V
O
= 3 VV
ripple
= 1 V
PP
I
O
= 100 mA
I
O
= 500 mA
I
O
= 1 A
∆V
O(pwr)
Thermal Regulation
T
a
= 25°C 30ms Pulse
I
O
= 0 to 1 A
V
I
= 4.75 to 8 V
V
I
= 4.75 V
Test Conditions
V
I
= 5.3 V I
O
= 10 mA
T
J
= 25°C
V
I
= 4.75 to 10 V
I
O
= 0 mA
I
O
= 0 to 1 A
Min.
3.234
3.168
1
1
0.5
0.3
10
5
1200
100
75
1
1.05
1.15
0.08
1.10
1.15
1.30
0.2
%/W
10
Typ.
3.3
Max.
3.366
3.432
6
10
Unit
V
V
mV
mV
%
%
V
mA
mA
µV
dB
V
5/17
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