1.0A Adjustable Positive
Voltage Regulator
LA317
1.0A Adustable Positive Voltage Regulator
General Description
•
The LA317 is an adjustable 3-terminal positive voltage
regulator with a very low dropout of 1.2V at 1A output
current. Using 2 external resistors, the LA317 can
provide an adjustable output voltage down to 1.25V.
•
The LA317 is available in standard SOT-223, D-PACK,
TO-220 and D2-PACK packages.
TO-220
D2-PACK
(TO-263)
SOT-223
D-PACK
(TO-252)
Features
•
•
•
•
•
•
•
Typical 1% output voltage tolerance
Typical 0.01%/V line reglation
Typical 0.2% Load Regulation
Very low dropout voltage: 1.2V at 1A output current
Trimmed current limit
On-chip thermal protection
RoHS Compliance
Applications
•
•
•
•
PC Motherboard
LCD Monitor
Graphic Card
DVD Player
•
Network Interface Card/Switch
•
Telecom Equipment
•
Printer and other Peripheral Equipment
Ordering Information
TAITRON COMPONENTS INCORPORATED
www.taitroncomponents.com
Tel:
Fax:
(800)-TAITRON (800)-824-8766
(800)-TAITFAX (800)-824-8329
(661)-257-6060
(661)-257-6415
Rev. A/DX 2007-06-04
Page 1 of 9
1.0A Adjustable Positive Voltage Regulator
LA317
Pin Configuration
Outline: H
SOT-223
Outline: D
D-PACK (TO-252)
Outline: T
TO-220
Outline: MC
D2-PACK (TO-263)
Block Diagram
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 2 of 9
1.0A Adjustable Positive Voltage Regulator
LA317
Absolute Maximum Ratings
(Ta=25° C, unless otherwise specified)
Symbol
V
IN-
V
OUT
I
O
T
J
T
OPR
T
STG
T
LEAD
ESD
Description
Input - Output Voltage Differential
Max. Output Current
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10sec.)
ESD, Human Body Model (Max.)
Ratings
15
1
150
0 ~ 125
-65 ~ 150
300
4000
Unit
V
A
°C
°C
°C
°C
V
Electrical Characteristics
(Typicals and limits apply for T
J
=
25ºC, P≤ Maximum Power Dissipation unless otherwise specified)(Note)
Symbol
V
REF
Description
Reference Input Voltage
LA317
Min.
Typ.
Max.
Unit
V
%/V
%
%/W
V
A
µA
µA
mA
dB
%
%
%
Conditions
10mA≤I
OUT
≤1A
≤
V
IN
-V
OUT
≤10V,
3V
1.20
-
-
-
1.2
-
-
-
60
-
-
-
1.25
0.01
0.2
0.04
1.2
1.5
50
0.2
3.5
75
1
0.3
0.003
1.30
0.04
0.4
0.07
1.3
1.8
100
5
10
-
-
-
-
∆V
OUT
/V
OUT
Line Regulation
∆V
OUT
∆V
I
LIMIT
I
ADJ
∆I
ADJ
I
L(MIN
)
PSRR
-
-
-
Load Regulation
Thermal Regulation
Dropout Voltage
Current Limit
Adjustable Pin Current
Adjustable Pin Current
Change
Minimum Load Current
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise (% of
V
OUT
)
I
OUT
≤20mA,
3V≤V
IN
-V
OUT
≤10V,
V
IN
-V
OUT
=2V, 10mA≤I
OUT
≤1A
20ms Pulse
I
OUT
=1A
V
IN
-V
OUT
=2V
-
1.4V≤
V
IN
-V
OUT
≤10V,
10mA≤I
OUT
≤1A
3V≤
V
IN
-V
OUT
≤15V
f=120Hz, C
OUT
=1µF Tantalum,
V
IN
-V
OUT
=3V, I
OUT
=1A
-
T
J
=125° C, 1000 Hours
T
J
=25° C, 10Hz≤f≤10KHz
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 3 of 9
1.0A Adjustable Positive Voltage Regulator
LA317
Symbol
Description
LA317
Min.
Typ.
Max.
Unit
Conditions
SOT-223
-
-
Thermal Resistance Junction
to Case
-
-
-
-
-
Thermal Shutdown
-
15
10
4.5
4
150
-
-
-
-
-
°C
°
C/W
TO-252
TO-220
TO-263
Junction Temperature
Note:
Thermal Shutdown
°C
-
Hysteresis
Maximum Power Dissipation is Package Type and Case Temperature dependent. Pls see Fig.8.
Typical Characteristics Curves
Fig.1- Dropout Voltage vs. Output Current
Output Voltage Deviation
(
%
)
Output Current (A)
Fig.3-
Reference Voltage vs. Temperature
Output Voltage
(
V
)
Fig.2- Load Regulation vs. Temperature
Ambient Temperature (° C)
Fig.4- Output Voltage vs. Temperature
Reference Voltage
(
V
)
Ambient Temperature (° C)
Output Voltage
(
V
)
Ambient Temperature (° C)
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 4 of 9
1.0A Adjustable Positive Voltage Regulator
LA317
Typical Characteristics Curves
(Continued)
Fig.5- Minimum Load Current vs. Temperature
Minimum Load Current
(
mA
)
Fig.6- Adjust Pin Current vs. Temperature
Adjust Current
(
µA
)
Ambient Temperature (° C)
Ambient Temperature (° C)
Fig.7- Short-Circuit Current vs. Temperature
Short-Circuit Current
(
A
)
Fig.8- Maximum Power Dissipation
Power
(
W
)
Junction Temperature (° C)
Case Temperature (° C)
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 5 of 9
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