NIKO-SEM
1A Fixed and Adjustable Low
Dropout Linear Regulator (LDO)
L1117 Series
SOT-223, TO-252,
TO-220,TO-263
GENERAL DESCRIPTION
The L1117 Series are positive and low drop-
out three-terminal voltage regulators with
1A output current capability. These devices
are designed for use in low voltage applica-
tions that offers lower dropout voltage and
faster transient response.
These devices are fully protected against
over current faults, over temperature oper-
ation, reversed input polarity, reversed lead
insertion, transient voltage spike …etc.
On-Chips trimming the reference voltage to
2% and features the low dropout of maxi-
mum 1.45 volts.
The L1117 Series regulators offer fixed and
adjustable voltage options available in the
popular industry standard SOT-223, TO-220,
TO-252 and TO-263 packages.
FEATURES
Fixed 2.5V, 2.85V, 3.3V, 5V or adjustable
output voltage
Low dropout voltage:
1.2V typical at up to 1A
Low ground current
Fast transient response
Current & thermal limiting
Line regulation: 0.5% typical
Load regulation: 0.5% typical
SOT-223,TO-220,TO-252,TO-263
package
APPLICATIONS
2.85V active SCSI terminators
8-15V to 5V linear regulators
5V to 2.5V or 3.3V linear regulators
Low voltage micro-controllers
Battery Chargers
Motherboard clock supplies
Post regulator for switching supplies
Micro-controllers
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage
Power Dissipation
Thermal Resistance
Junction to Case,
θ
JC
Thermal Resistance
Junction to Ambient,
θ
JA
SOT-223
TO-252
TO-220
TO-263
15V*
Internally
Limited
16 °C/W
Operating Junction
Temperature Range
Storage Temperature
Range
Lead Temperature
(Soldering, 10 Seconds)
0 to 125 °C
-40 to 150 °C
260 °C
158 °C/W
70 °C/W
50 °C/W
60 °C/W
* When considering short circuits to ground, the maximum input-to-output differential voltage shall not be allowed
greater than approximate 2~3V at values of supply voltage in excess of 10V, continuous short-circuits can exceed
the power dissipation ratings and cause eventual destruction.
1
JUL-27-2001
NIKO-SEM
1A Fixed and Adjustable Low
Dropout Linear Regulator (LDO)
L1117 Series
SOT-223, TO-252,
TO-220,TO-263
ELECTRICAL CHARACTERISTICS for ADJUSTABLE
(Unless otherwise specified, T
A
= 25°C)
Parameter
Symbol
Test Conditions
Typical
1.25V
V
O
1.2V
0.5%
0.5%
10mA
55µA
1.2A
0.003%
of V
OUT
72dB
100µA
1.1A (Min)
Limits
1.23V
Min
1.27V
Max
0.98V
O(Min)
1.02V
O(Max)
1.45V
2%
2.5%
Reference Voltage
(Adjustable version) V
REF
V
IN
= 5V, I
OUT
= 10mA
Output Voltage
V
O
V
IN
= 5V, I
OUT
= 10mA
(Fixed version)
Dropout Voltage
V
D
ΔV
REF
= 1%, I
OUT
= 1A
Line Regulation
REG
(LINE)
(V
OUT
+ 1.5V)
≤
V
IN
≤
15V, I
OUT
= 10mA
Load Regulation
REG
(LOAD)
(V
IN
-V
OUT
) = 2V, 10mA
≤
I
OUT
≤
1A
Minimum Load
Current
I
O
I
ADJ
I
CL
V
N
R
A
1.5V
≤
(V
IN
-V
OUT
)
≤
5.75V
V
IN
- V
OUT
= 2V
Adjust Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
f = 120Hz, C
ADJ
= 22µF for ADJ pin,
V
IN
= 5V, I
OUT
= 1A
60dB (Min)
ELECTRICAL CHARACTERISTICS for L1117-2.5
(Unless otherwise specified, T
A
= 25 °C)
Parameter
Output Voltage
(Fixed version)
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
Symbol
V
O
Test Conditions
V
IN
= 5V, I
OUT
= 10mA
Typical
V
O
1.2V
0.5%
0.5%
10mA
55µA
1.2A
0.003%
of V
OUT
72dB
Limits
2.45V
(Min)
2.55V
(Max)
1.45V
2.0%
2.0%
V
D
ΔV
O
= 1%, I
OUT
= 1A
REG
(LINE)
(V
OUT
+ 1.5V)
≤
V
IN
≤
15V, I
OUT
= 10mA
REG
(LOAD)
(V
IN
-V
OUT
) = 2V, 10mA
≤
I
OUT
≤
1A
I
O
I
GND
I
CL
V
N
R
A
f = 120Hz, Co=22Uf,V
IN
= 5V,
I
OUT
= 1A
1.5V
≤
(V
IN
-V
OUT
)
≤
5.75V
V
IN
- V
OUT
= 2V
GND Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
100µA
1.1A (Min)
60dB (Min)
2
JUL-27-2001
NIKO-SEM
1A Fixed and Adjustable Low
Dropout Linear Regulator (LDO)
L1117 Series
SOT-223, TO-252,
TO-220,TO-263
ELECTRICAL CHARACTERISTICS for L1117-2.85
(Unless otherwise specified, T
A
= 25 °C)
Parameter
Output Voltage
(Fixed version)
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
Symbol
V
O
Test Conditions
V
IN
= 5V, I
OUT
= 10mA
Typical
V
O
1.2V
0.5%
0.5%
10mA
55µA
1.2A
0.003%
of V
OUT
72dB
Limits
2.793V
(Min)
2.907V
(Max)
1.45V
2.0%
2.0%
V
D
ΔV
O
= 1%, I
OUT
= 1A
REG
(LINE)
(V
OUT
+ 1.5V)
≤
V
IN
≤
8V, I
OUT
= 10mA
REG
(LOAD)
(V
IN
-V
OUT
) = 2V, 10mA
≤
I
OUT
≤
1A
I
O
I
GND
I
CL
V
N
R
A
f = 120Hz, Co=22Uf,V
IN
= 5V,
I
OUT
= 1A
1.5V
≤
(V
IN
-V
OUT
)
≤
5.75V
V
IN
- V
OUT
= 2V
GND Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
100µA
1.1A (Min)
60dB (Min)
ELECTRICAL CHARACTERISTICS for L1117-3.3
(Unless otherwise specified, T
A
= 25 °C)
Parameter
Output Voltage
(Fixed version)
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
Symbol
V
O
Test Conditions
V
IN
= 5V, I
OUT
= 10mA
Typical
V
O
1.2V
0.5%
0.5%
10mA
55µA
1.2A
0.003%
of V
OUT
72dB
Limits
3.234V
(Min)
3.367V
(Max)
1.45V
2.0%
2.0%
V
D
ΔV
O
= 1%, I
OUT
= 1A
REG
(LINE)
(V
OUT
+ 1.5V)
≤
V
IN
≤
15V, I
OUT
= 10mA
REG
(LOAD)
(V
IN
-V
OUT
) = 2V, 10mA
≤
I
OUT
≤
1A
I
O
I
GND
I
CL
V
N
R
A
f = 120Hz, Co=22Uf,V
IN
= 5V,
I
OUT
= 1A
1.5V
≤
(V
IN
-V
OUT
)
≤
5.75V
V
IN
- V
OUT
= 2V
GND Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
100µA
1.1A (Min)
60dB (Min)
3
JUL-27-2001
NIKO-SEM
1A Fixed and Adjustable Low
Dropout Linear Regulator (LDO)
L1117 Series
SOT-223, TO-252,
TO-220,TO-263
ELECTRICAL CHARACTERISTICS for L1117-5
(Unless otherwise specified, T
A
= 25 °C)
Parameter
Output Voltage
(Fixed version)
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
Symbol
V
O
Test Conditions
V
IN
= 8V, I
OUT
= 10mA
Typical
V
O
1.2V
0.5%
0.5%
10mA
55µA
1.2A
0.003%
of V
OUT
72dB
Limits
4.90V
(Min)
5.10V
(Max)
1.45V
1.0%
1.0%
V
D
ΔV
O
= 1%, I
OUT
= 1A
REG
(LINE)
(V
OUT
+ 1.5V)
≤
V
IN
≤
15V, I
OUT
= 10mA
REG
(LOAD)
(V
IN
-V
OUT
) = 2V, 10mA
≤
I
OUT
≤
1A
I
O
I
GND
I
CL
V
N
R
A
f = 120Hz, Co=22uf,V
IN
= 8V,
I
OUT
= 1A
1.5V
≤
(V
IN
-V
OUT
)
≤
5.75V
V
IN
- V
OUT
= 2V
GND Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
100µA
1.1A (Min)
60dB (Min)
DEVICE SELECTION GUIDE
Device
Voltage Version
Package
Marking
L1117L
ADJ
SOT-223
L1117L
L1117D
ADJ
TO-252
L1117D
L1117L-2.5 L1117L-2.85 L1117L-3.3 L1117D-3.3 L1117L-5
2.5
2.85
3.3
3.3
5
SOT-223
SOT-223
SOT-223
TO-252
SOT-223
L1117L-2.5 L1117L-2.85 L1117L-3.3 L1117D-3.3 L1117L-5
L1117D-5
Device
5
Voltage Version
TO-252
Package
L1117D-5
Marking
L1117T
ADJ
TO-220
L1117T
L1117T-3.3
3.3
TO-220
L1117T-3.3
L1117T-5
5
TO-220
L1117T-5
L1117S-5
5
TO-263
L1117S-5
4
JUL-27-2001
NIKO-SEM
1A Fixed and Adjustable Low
Dropout Linear Regulator (LDO)
L1117 Series
SOT-223, TO-252,
TO-220,TO-263
TYPICAL APPLICATION
Vin
Vin
IN
ADJ
Cin
10uF
Iadj
R2
L1117
OUT
Vref
Vout
4.3v-8V
IN
OUT
L1117-2.85
GND
R1
+
+
Cout
10uF
Cin
10uF
+
Cout
22uF
+
18~27 Lines
Vo = Vref (1+R2/R1) + Iadj x R2
1. Cin needed if device is far from from filter capacitors.
2. Cout required for stability.
- Basic Adjustable Regulator Circuit -
- Active SCSI Bus Terminators -
Vin > 4.75V
IN
Vout=3.3V
Vin > 4.00V
IN
Vout=2.5V
L1117-3.3
OUT
L1117-2.5
OUT
Cin
10uF
GND
+
Cout
22uF
+
RL
Cin
10uF
GND
+
Cout
22uF
+
RL
Basic Fixed Output Regulator Circuit
Vin>6.5V
IN
OUT
Basic Fixed Output Regulator Circuit
L1117-5
GND
Cin
10uF
+
Cout
22uF
+
RL
Basic Fixed Output Regulator Circuit
5
JUL-27-2001
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