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October 2004
s
LOW DROPOUT VOLTAGE (1V TYP.)
s
2.85V DEVICE PERFORMANCES ARE
SUITABLE FOR SCSI-2 ACTIVE
TERMINATION
s
OUTPUT CURRENT UP TO 800 mA
s
FIXED OUTPUT VOLTAGE OF: 1.2V, 1.8V,
2.5V, 2.85V, 3.0V, 3.3V, 5.0V
s
ADJUSTABLE VERSION AVAILABILITY
(V
rel
=1.25V)
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INTERNAL CURRENT AND THERMAL LIMIT
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AVAILABLE IN 1% (AT 25C) AND 2% IN
FULL TEMPERATURE RANGE
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SUPPLY VOLTAGE REJECTION: 75dB (TYP.)
DESCRIPTION
The LD1117 is a LOW DROP Voltage Regulator
able to provide up to 800mA 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,
3.0V 3.3V and 5.0V. The 2.85V type is ideal for
SCSI-2 lines active termination. The device is
supplied in: SOT-223, DPAK, SO-8, TO-220 and
TO-220FM. The SOT-223 and DPAK surface
mount packages optimize the thermal
characteristics even offering a relevant space
saving effect. High efficiency is assured by NPN
pass transistor. In fact in this case, unlike than
PNP one, the Quiescent Current flows mostly into
the load. Only a very common 10F minimum
capacitor is needed for stability. On chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within 1% at 25C. The
ADJUSTABLE LD1117 is pin to pin compatible
with the other standard. Adjustable voltage
regulators maintaining the better performances in
terms of Drop and Tolerance.
LD1117
SERIES
LOW DROP FIXED AND ADJUSTABLE
POSITIVE VOLTAGE REGULATORS
Figure 1: Block Diagram
SOT-223
DPAK
TO-220FM
SO-8
TO-220
Rev. 16
LD1117 SERIES
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Table 2: Absolute Maximum Ratings
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 3: Thermal Data
Figure 3: Application Circuit (FOR 1.2 V)
Figure 4: Application Circuit (FOR OTHER FIXED OUTPUT VOLTAGES)
Symbol
Parameter
Value
Unit
V
IN
DC Input Voltage
15
V
P
tot
Power Dissipation
12
W
T
stg
Storage Temperature Range
-40 to +150
C
T
op
Operating Junction Temperature Range
for C Version
-40 to +125
C
for standard Version
0 to +125
C
Symbol
Parameter
SOT-223
SO-8
DPAK
TO-220
TO-220FM
Unit
R
thj-case
Thermal Resistance Junction-case
15
20
8
3
4
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
60
C/W
LD1117 SERIES
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Table 4: Electrical Characteristics Of LD1117#12 (refer to the test circuits, T
J
= 0 to 125C,
C
O
= 10 F, R = 120
between GND and OUT pins, unless otherwise specified)
Table 5: Electrical Characteristics Of LD1117#18 (refer to the test circuits, T
J
= 0 to 125C,
C
O
= 10 F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
V
in
= 3.2 V I
O
= 10 mA
T
J
= 25C
1.188
1.20
1.212
V
V
O
Reference Voltage
I
O
= 10 to 800 mA V
in
- V
O
= 1.4 to 10 V
1.140
1.20
1.260
V
V
O
Line Regulation
V
in
- V
O
= 1.5 to 13.75 V
I
O
= 10 mA
0.035
0.2
%
V
O
Load Regulation
V
in
- V
O
= 3 V
I
O
= 10 to 800 mA
0.1
0.4
%
V
O
Temperature Stability
0.5
%
V
O
Long Term Stability
1000 hrs, T
J
= 125C
0.3
%
V
in
Operating Input Voltage
15
V
I
adj
Adjustment Pin Current
V
in
15 V
60
120
A
I
adj
Adjustment Pin Current
Change
V
in
- V
O
= 1.4 to 10 V
I
O
= 10 to 800 mA
1
5
A
I
O(min)
Minimum Load Current
V
in
= 15 V
2
5
mA
I
O
Output Current
V
in
- V
O
= 5 V
T
J
= 25C
800
950
1300
mA
eN
Output Noise (%V
O
)
B =10Hz to 10KHz
T
J
= 25C
0.003
%
SVR
Supply Voltage Rejection
I
O
= 40 mA f = 120Hz
T
J
= 25C
V
in
- V
O
= 3 V
V
ripple
= 1 V
PP
60
75
dB
V
d
Dropout Voltage
I
O
= 100 mA
1
1.1
V
I
O
= 500 mA
1.05
1.15
I
O
= 800 mA
1.10
1.2
Thermal Regulation
T
a
= 25C 30ms Pulse
0.01
0.1
%/W
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
V
in
= 3.8 V I
O
= 10 mA
T
J
= 25C
1.78
1.8
1.82
V
V
O
Output Voltage
I
O
= 0 to 800 mA
V
in
= 3.3 to 8 V
1.76
1.84
V
V
O
Line Regulation
V
in
= 3.3 to 8 V
I
O
= 0 mA
1
6
mV
V
O
Load Regulation
V
in
= 3.3 V
I
O
= 0 to 800 mA
1
10
mV
V
O
Temperature Stability
0.5
%
V
O
Long Term Stability
1000 hrs, T
J
= 125C
0.3
%
V
in
Operating Input Voltage
I
O
= 100 mA
10
V
I
d
Quiescent Current
V
in
8 V
5
10
mA
I
O
Output Current
V
in
= 6.8 V T
J
= 25C
800
950
1300
mA
eN
Output Noise Voltage
B =10Hz to 10KHz
T
J
= 25C
100
V
SVR
Supply Voltage Rejection
I
O
= 40 mA f = 120Hz
T
J
= 25C
V
in
= 5.5 V V
ripple
= 1 V
PP
60
75
dB
V
d
Dropout Voltage
I
O
= 100 mA
1
1.1
V
I
O
= 500 mA
1.05
1.15
I
O
= 800 mA
1.10
1.2
Thermal Regulation
T
a
= 25C 30ms Pulse
0.01
0.1
%/W
LD1117 SERIES
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Table 6: Electrical Characteristics Of LD1117#25 (refer to the test circuits, T
J
= 0 to 125C,
C
O
= 10 F unless otherwise specified)
Table 7: Electrical Characteristics Of LD1117#28 (refer to the test circuits, T
J
= 0 to 125C,
C
O
= 10 F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
V
in
= 4.5 V I
O
= 10 mA
T
J
= 25C
2.475
2.5
2.525
V
V
O
Output Voltage
I
O
= 0 to 800 mA
V
in
= 3.9 to 10 V
2.45
2.55
V
V
O
Line Regulation
V
in
= 3.9 to 10 V
I
O
= 0 mA
1
6
mV
V
O
Load Regulation
V
in
= 3.9 V
I
O
= 0 to 800 mA
1
10
mV
V
O
Temperature Stability
0.5
%
V
O
Long Term Stability
1000 hrs, T
J
= 125C
0.3
%
V
in
Operating Input Voltage
I
O
= 100 mA
15
V
I
d
Quiescent Current
V
in
10 V
5
10
mA
I
O
Output Current
V
in
= 7.5 V T
J
= 25C
800
950
1300
mA
eN
Output Noise Voltage
B =10Hz to 10KHz
T
J
= 25C
100
V
SVR
Supply Voltage Rejection
I
O
= 40 mA f = 120Hz
T
J
= 25C
V
in
= 5.5 V V
ripple
= 1 V
PP
60
75
dB
V
d
Dropout Voltage
I
O
= 100 mA
1
1.1
V
I
O
= 500 mA
1.05
1.15
I
O
= 800 mA
1.10
1.2
Thermal Regulation
T
a
= 25C 30ms Pulse
0.01
0.1
%/W
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
V
in
= 4.85 VI
O
= 10 mA
T
J
= 25C
2.82
2.85
2.88
V
V
O
Output Voltage
I
O
= 0 to 800 mA
V
in
= 4.25 to 10 V
2.79
2.91
V
V
O
Line Regulation
V
in
= 4.25 to 10 V
I
O
= 0 mA
1
6
mV
V
O
Load Regulation
V
in
= 4.25 V
I
O
= 0 to 800 mA
1
10
mV
V
O
Temperature Stability
0.5
%
V
O
Long Term Stability
1000 hrs, T
J
= 125C
0.3
%
V
in
Operating Input Voltage
I
O
= 100 mA
15
V
I
d
Quiescent Current
V
in
10 V
5
10
mA
I
O
Output Current
V
in
= 7.85 VT
J
= 25C
800
950
1300
mA
eN
Output Noise Voltage
B =10Hz to 10KHz
T
J
= 25C
100
V
SVR
Supply Voltage Rejection
I
O
= 40 mA f = 120Hz
T
J
= 25C
V
in
= 5.85 VV
ripple
= 1 V
PP
60
75
dB
V
d
Dropout Voltage
I
O
= 100 mA
1
1.1
V
I
O
= 500 mA
1.05
1.15
I
O
= 800 mA
1.10
1.2
Thermal Regulation
T
a
= 25C 30ms Pulse
0.01
0.1
%/W
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