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LM317
3-Terminal Positive Adjustable Regulator
Features Description
" Output Current In Excess of 1. 5A This monolithic integrated circuit is an adjustable 3-terminal
" Output Adjustable Between 1. 2V and 37V positive voltage regulator designed to supply more than 1.5A
" Internal Thermal Overload Protection of load current with an output voltage adjustable over a 1.2
" Internal Short Circuit Current Limiting to 37V. It employs internal current limiting, thermal
" Output Transistor Safe Operating Area Compensation shut-down and safe area compensation.
" TO-220 Package
TO-220
1
1. Adj 2. Output 3. Input
Internal Block Diagram
Vin
Input 3
+
-
Protection
Voltage
Circuitry
Reference
Rlimit
2
Vo
Output
1
Adj
Vadj
Rev. 1.0.0
©2001 Fairchild Semiconductor Corporation
LM317
Absolute Maximum Ratings
Parameter Symbol Value Unit
Input-Output Voltage Differential VI - VO 40 V
Lead Temperature T 230 °C
LEAD
Power Dissipation P Internally limited W
D
Operating Junction Temperature Range Tj 0 ~ +125 °C
Storage Temperature Range T -65 ~+125 °C
STG
Temperature Coefficient of Output Voltage "Vo/"T Ä…0.02 %/°C
Electrical Characteristics
(V =5V, I = 0.5A, 0°C d" T d" + 125°C, I = 1.5A, P = 20W, unless otherwise specified)
I-V
O O J MAX DMAX
Parameter Symbol Conditions Min Typ. Max. Unit
T = +25°C
A
- 0.01 0.04 % / V
3V d" V - V d" 40V
I O
Line Regulation (Note1) Rline
3V d" V - V d" 40V - 0.02 0.07 % / V
I O
T = +25°C, 10mA d" IO d" I
A MAX
VO< 5V - 18 25 mV% / V
O
VO e" 5V 0.4 0.5
Load Regulation (Note1) Rload
10mA d" I d" I
O MAX
V < 5V - 40 70 mV% / V
O O
V e" 5V 0.8 1.5
O
Adjustable Pin Current I - - 46 100 µA
ADJ
3V d" VI - VO d" 40V
Adjustable Pin Current Change "I - 2.0 5 µA
ADJ
10mA d" I d" I PD d" PMAX
O MAX
3V d" V - V d" 40V
IN O
Reference Voltage V 10mA d" I d" I 1.20 1.25 1.30 V
REF O MAX
P d" P
D MAX
Temperature Stability ST -- 0.7 - % / V
T O
Minimum Load Current to Maintain
I V - V = 40V - 3.5 12 mA
L(MIN) I O
Regulation
V - V d" 15V, P d" P
I O D MAX
2.2
Maximum Output Current I V - V d" 40V, P d" P 1.0 - A
O(MAX) I O D MAX
0.3
T =25°C
A
RMS Noise, % of V e T = +25°C, 10Hz d" f d" 10KHz - 0.003 0.01 % / V
OUT N A O
V = 10V, f = 120Hz
O
Ripple Rejection RR without CADJ 66 60 - dB
CADJ = 10µF (Note2) 75
Long-Term Stability, T = T T = +25°C for end point
J HIGH A
ST - 0.3 1 %
measurements, 1000HR
Thermal Resistance Junction to
R - - 5 - °C / W
¸JC
Case
Note:
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. (P = 20W)
MAX
2. C , when used, is connected between the adjustment pin and ground.
ADJ
2
LM317
Typical Perfomance Characteristics
TEMPERATURE (°C) TEMPERATURE (°C)
Figure 1. Load Regulation Figure 2. Adjustment Current
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. Dropout Voltage Figure 4. Reference Voltage
3
ADJUSTMENT CURRENT(uA)
OUTPUT VOLTAGE DEVIATION(%)
REFERENCE VOLTAGE(V)
INPUT-OUTPUT DIFFERENTIAL(V)
LM317
Typical Application
V VI LM317 Vo
I KA317 Output
Input
Vadj
R
1
Ci
Co
I
0. 1µF adj
µ
µ
µ
1µF
µ
µ
µ
I
adj
R
2
V = 1.25V (1+ R / R )+I R
O 2 1 adj 2
Figure 5. Programmable Regulator
C is required when regulator is located an appreciable distance from power supply filter.
i
C is not needed for stability, however, it does improve transient response.
o
Since I is controlled to less than 100µA, the error associated with this term is negligible in most applications.
ADJ
4
LM317
Mechanical Dimensions
Package
TO-220
9.90 Ä…0.20 4.50 Ä…0.20
(8.70)
+0.10
1.30
Å‚3.60 Ä…0.10
 0.05
1.27 Ä…0.10 1.52 Ä…0.10
0.80 Ä…0.10
+0.10
0.50
2.40 Ä…0.20
 0.05
2.54TYP 2.54TYP
[2.54 Ä…0.20] [2.54 Ä…0.20]
10.00 Ä…0.20
5
(1.70)
1.30
Ä…
0.10
2.80
Ä…
0.10
18.95MAX.
15.90
Ä…
0.20
9.20
Ä…
0.20
(1.46)
(3.00)
(3.70)
(1.00)
13.08
Ä…
0.20
10.08
Ä…
0.30
(45
°
)
LM317
Ordering Information
Product Number Package Operating Temperature
LM317T TO-220 0°C to + 125°C
6
LM317
7
LM317
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems 2. A critical component in any component of a life support
which, (a) are intended for surgical implant into the body, device or system whose failure to perform can be
or (b) support or sustain life, and (c) whose failure to reasonably expected to cause the failure of the life support
perform when properly used in accordance with device or system, or to affect its safety or effectiveness.
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
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© 2001 Fairchild Semiconductor Corporation