Voltage Regulator. LM317 Datasheet

LM317 Regulator. Datasheet pdf. Equivalent


Part LM317
Description Positive Voltage Regulator
Feature .
Manufacture ON Semiconductor
Datasheet
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LM317
LM317, NCV317
Voltage Regulator -
Adjustable Output, Positive
1.5 A
The LM317 is an adjustable 3terminal positive voltage regulator
capable of supplying in excess of 1.5 A over an output voltage range of
1.2 V to 37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it
employs internal current limiting, thermal shutdown and safe area
compensation, making it essentially blowout proof.
The LM317 serves a wide variety of applications including local, on
card regulation. This device can also be used to make a programmable
output regulator, or by connecting a fixed resistor between the
adjustment and output, the LM317 can be used as a precision current
regulator.
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 Constant with Temperature
Output Transistor SafeArea Compensation
Floating Operation for High Voltage Applications
Eliminates Stocking many Fixed Voltages
Available in Surface Mount D2PAK3, and Standard 3Lead
Transistor Package
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AECQ100
Qualified and PPAP Capable
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Vin
Vout
LM317
Cin*
0.1 mF
IAdj Adjust
R1
240
+ CO**
1.0 mF
R2
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3
D2PAK3
D2T SUFFIX
CASE 936
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
TO220
T SUFFIX
CASE 221AB
1
2
3
Pin 1. Adjust
2. Vout
3. Vin
Heatsink surface connected to Pin 2.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
** Cin is required if regulator is located an appreciable distance from power supply filter.
** CO is not needed for stability, however, it does improve transient response.
ǒ Ǔ Vout  +  1.25 V 
1
)
R2
R1
)  IAdj R2
Since IAdj is controlled to less than 100 mA, the error associated with this term is
negligible in most applications.
Figure 1. Standard Application
© Semiconductor Components Industries, LLC, 2016
1
October, 2019 Rev. 16
Publication Order Number:
LM317/D



LM317
LM317, NCV317
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
InputOutput Voltage Differential
VIVO
0.3 to 40
Vdc
Power Dissipation
Case 221A
TA = +25°C
Thermal Resistance, JunctiontoAmbient
Thermal Resistance, JunctiontoCase
Case 936 (D2PAK3)
PD
Internally Limited W
qJA
65
°C/W
qJC
5.0
°C/W
TA = +25°C
Thermal Resistance, JunctiontoAmbient
Thermal Resistance, JunctiontoCase
PD
Internally Limited W
qJA
70
°C/W
qJC
5.0
°C/W
Operating Junction Temperature Range
TJ
55 to +150
°C
Storage Temperature Range
Tstg
65 to +150
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
ELECTRICAL CHARACTERISTICS
(VIVO = 5.0 V; IO = 0.5 A for D2T and T packages; TJ = Tlow to Thigh (Note 1); Imax and Pmax (Note 2); unless otherwise noted.)
Characteristics
Figure Symbol Min
Typ
Max
Unit
Line Regulation (Note 3), TA = +25°C, 3.0 V VIVO 40 V
Load Regulation (Note 3), TA = +25°C, 10 mA IO Imax
VO 5.0 V
VO 5.0 V
Thermal Regulation, TA = +25°C (Note 4), 20 ms Pulse
Adjustment Pin Current
Adjustment Pin Current Change, 2.5 V VIVO 40 V,
10 mA IL Imax, PD Pmax
Reference Voltage, 3.0 V VIVO 40 V, 10 mA IO Imax, PD Pmax
Line Regulation (Note 3), 3.0 V VIVO 40 V
Load Regulation (Note 3), 10 mA IO Imax
VO 5.0 V
VO 5.0 V
Temperature Stability (Tlow TJ Thigh)
Minimum Load Current to Maintain Regulation (VIVO = 40 V)
Maximum Output Current
VIVO 15 V, PD Pmax, T Package
VIVO = 40 V, PD Pmax, TA = +25°C, T Package
RMS Noise, % of VO, TA = +25°C, 10 Hz f 10 kHz
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 5)
Without CAdj
CAdj = 10 mF
Thermal Shutdown (Note 6)
LongTerm Stability, TJ = Thigh (Note 7), TA = +25°C for
Endpoint Measurements
1
Regline
2
Regload
Regtherm
3
IAdj
1, 2
DIAdj
3
Vref
1.2
1
Regline
2
Regload
3
TS
3
ILmin
3
Imax
1.5
0.15
N
4
RR
66
3
S
0.01
5.0
0.1
0.03
50
0.2
1.25
0.02
20
0.3
0.7
3.5
2.2
0.4
0.003
65
80
180
0.3
0.04
%/V
25
mV
0.5
% VO
0.07 % VO/W
100
mA
5.0
mA
1.3
V
0.07
%/V
70
mV
1.5
% VO
% VO
10
mA
A
% VO
dB
°C
1.0
%/1.0
kHrs.
Thermal Resistance JunctiontoCase, T Package
RqJC
5.0
°C/W
1. Tlow to Thigh = 0° to +125°C, for LM317T, D2T. Tlow to Thigh = 40° to +125°C, for LM317BT, BD2T, Tlow to Thigh = 55° to +150°C, for
NCV317BT, BD2T.
2. Imax = 1.5 A, Pmax = 20 W
3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
4. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die.
These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these
temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
5. CAdj, when used, is connected between the adjustment pin and ground.
6. Thermal characteristics are not subject to production test.
7. Since LongTerm Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average
stability from lot to lot.
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