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Fairchild Semiconductor
Fairchild Semiconductor

LM317T Datasheet

3-Terminal Positive Adjustable Regulator


LM317T Datasheet Preview


KA317 / LM317
3-Terminal Positive Adjustable Regulator
September 2014
Features
• Output-Current In Excess of 1.5 A
• Output-Adjustable Between 1.2 V and 37 V
• Internal Thermal Overload Protection
• Internal Short-Circuit Current Limiting
• Output-Transistor Safe Operating Area Compensation
• TO-220 Package
Description
This monolithic integrated circuit is an adjustable 3-termi-
nal positive-voltage regulator designed to supply more
than 1.5 A of load current with an output voltage adjust-
able over a 1.2 V to 37 V range. It employs internal cur-
rent limiting, thermal shutdown, and safe area
compensation.
TO-220
Output
1
1. Adj 2. Output 3. Input
Ordering Information
Product Number
LM317T
KA317TU
Package
TO-220 (Single Gauge)
TO-220 (Dual Gauge)
Block Diagram
Vin 3
Input
Packing Method
Rail
Rail
Operating Temperature
0°C to +125°C
0°C to +125°C
Voltage
Reference
Protection
Circuitry
1
VVAaADdJjj
© 2002 Fairchild Semiconductor Corporation
KA317 / LM317 Rev. 1.2.2
Figure 1. Block Diagram
RRlLimIMiItT
2 Vo
Output
www.fairchildsemi.com
Page 1

Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
Parameter
Value
Unit
VI - VO
TLEAD
TJ
TSTG
ΔVO/ΔT
Input-Output Voltage Differential
Lead Temperature
Operating Junction Temperature Range
Storage Temperature Range
Temperature Coefficient of Output Voltage
40
230
0 to +125
-65 to +125
±0.02
V
°C
°C
°C
%/°C
Thermal Characteristics
Values are at TA = 25°C unless otherwise noted.
Symbol
Parameter
PD
RθJA
RθJC
Power Dissipation
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
Value
Internally Limited
80
5
Units
W
°C/W
°C/W
© 2002 Fairchild Semiconductor Corporation
KA317 / LM317 Rev. 1.2.2
2
www.fairchildsemi.com
Page 2

Electrical Characteristics
VI-VO = 5 V, IO = 0.5 A, 0°C TJ +125°C, IMAX = 1.5 A, PDMAX = 20 W, unless otherwise specified.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
RLINE
RLOAD
IADJ
ΔIADJ
VREF
STT
IL(MIN)
IO(MAX)
eN
RR
ST
Line Regulation(1)
Load Regulation(1)
Adjustable Pin Current
Adjustable Pin Current
Change
Reference Voltage
Temperature Stability
Minimum Load Current
to Maintain Regulation
Maximum Output
Current
RMS Noise,% of VOUT
Ripple Rejection(2)
Long-Term Stability,
TJ = THIGH
TA = +25°C, 3 V VI - VO 40 V
3 V VI - VO 40 V
TA = +25°C,
10mA IO IMAX
VO < 5 V
VO 5 V
10 mA IO IMAX
VO < 5 V
VO 5 V
3 V VI - VO 40 V,
10 mA IO IMAX, PD PMAX
3 V VIN - VO 40 V,
10 mA IO IMAX, PD PMAX
VI - VO = 40 V
TA = 25°C
VI - VO 15 V,
PD PMAX
VI - VO 40 V,
PD PMAX
TA = +25°C, 10 Hz f 10 kHz
VO = 10 V,
f = 120 Hz
without CADJ
CADJ = 10 μF
TA = +25°C for End Point
Measurements, 1000 HR
0.01
0.02
18
0.4
40
0.8
46
2.0
0.04
0.07
25
0.5
70
1.5
100
5.0
%/ V
mV
%/VO
mV
%/VO
μA
μA
1.20
1.25
0.7
3.5
1.30
12.0
V
%/VO
mA
1.5 2.2
0.3
A
0.003 0.010 %/VO
60
66 75
dB
0.3 1.0 %
Notes:
1. Load and line regulation are specified at constant junction temperature. Change in VD due to heating effects must be
taken into account separately. Pulse testing with low duty is used (PMAX = 20 W).
2. CADJ, when used, is connected between the adjustment pin and ground.
© 2002 Fairchild Semiconductor Corporation
KA317 / LM317 Rev. 1.2.2
3
www.fairchildsemi.com
Page 3
Part Number LM317T
Manufactur Fairchild Semiconductor
Description 3-Terminal Positive Adjustable Regulator
Total Page 7 Pages
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