MOTOROLA LM317 Technical data
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The LM317 is an adjustable 3–terminal 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 blow–out 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.
• 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 Safe–Area Compensation
• Floating Operation for High Voltage Applications
• A vailable in Surface Mount D
Package
2
P AK, and Standard 3–Lead Transistor
• Eliminates Stocking many Fixed Voltages
Standard Application
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
Pin 1. Adjust
2. V
3. V
out
in
1
2
3
V
in
Cin*
µ
F
0.1
**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.
+
V
out
Since I
is controlled to less than 100
Adj
negligible in most applications.
LM317
I
Adj
Adjust
R
2
1.25 Vǒ1
R
)
R
µ
A, the error associated with this term is
V
out
R
1
240
+
CO**
1.0
2
Ǔ
)
I
R
2
Adj
1
MOTOROLA ANALOG IC DEVICE DATA
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
µ
F
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
2
1
3
ORDERING INFORMATION
Operating
Device
LM317BD2T
LM317BT
LM317D2T
LM317T
Motorola, Inc. 1996 Rev 1
Temperature Range
TJ = –40° to +125°C
TJ = 0° to +125°C
Package
Surface Mount
Insertion Mount
Surface Mount
Insertion Mount
1
MAXIMUM RATINGS
Rating Symbol Value Unit
Input–Output V oltage Differential VI–V
Power Dissipation
Case 221A
TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ
Case 936 (D2PAK)
TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ
Operating Junction Temperature Range T
Storage Temperature Range T
D
JA
JC
D
JA
JC
J
stg
LM317
O
40 Vdc
Internally Limited W
65 °C/W
5.0 °C/W
Internally Limited W
70 °C/W
5.0 °C/W
–40 to +125 °C
–65 to +150 °C
ELECTRICAL CHARACTERISTICS (V
= 5.0 V; IO = 0.5 A for D2T and T packages; TJ = T
I–VO
low
to T
high
[Note 1]; I
max
and P
[Note 2]; unless otherwise noted.)
Characteristics
Line Regulation (Note 3), TA = +25°C, 3.0 V ≤ VI–VO ≤ 40 V 1 Reg
Load Regulation (Note 3), TA = +25°C, 10 mA ≤ IO ≤ I
VO ≤ 5.0 V
max
VO ≥ 5.0 V
Thermal Regulation, TA = +25°C (Note 6), 20 ms Pulse Reg
Adjustment Pin Current 3 I
Adjustment Pin Current Change, 2.5 V ≤ VI–VO ≤ 40 V,
10 mA ≤ IL ≤ I
max
, PD ≤ P
max
Reference Voltage, 3.0 V ≤VI–VO ≤ 40 V,
10 mA ≤ IO ≤ I
max
, PD ≤ P
max
Line Regulation (Note 3), 3.0 V ≤ VI–VO ≤ 40 V 1 Reg
Load Regulation (Note 3), 10 mA ≤ IO ≤ I
VO ≤ 5.0 V
max
VO ≥ 5.0 V
Temperature Stability (T
low
≤ TJ ≤ T
) 3 T
high
Minimum Load Current to Maintain Regulation (VI–VO = 40 V) 3 I
Maximum Output Current
VI–VO ≤ 15 V, PD ≤ P
VI–VO = 40 V, PD ≤ P
T Package
max,
, TA = +25°C, T Package
max
Figure Symbol Min Typ Max Unit
– 0.01 0.04 %/V
–
–
5.0
0.1
25
0.5
– 0.03 0.07 % VO/W
– 50 100 µA
– 0.2 5.0 µA
1.2 1.25 1.3 V
– 0.02 0.07 % V
–
–
20
0.3
70
1.5
– 0.7 – % V
– 3.5 10 mA
1.5
0.15
2.2
0.4
–
–
2 Reg
1, 2 ∆I
3 V
2 Reg
3 I
line
load
therm
Adj
Adj
ref
line
load
S
Lmin
max
RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz N – 0.003 – % V
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4)
Without C
C
Long–Term Stability, TJ = T
Endpoint Measurements
Adj
Adj
= 10 µF
(Note 5), TA = +25°C for
high
Thermal Resistance Junction to Case, T Package R
NOTES: 1. T
to T
low
2.I
max
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.C
Adj
5.Since Long–Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.
6.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.
= 0° to +125°C, for LM317T, D2T. T
high
= 1.5 A, P
, when used, is connected between the adjustment pin and ground.
max
= 20 W
low
to T
high
4 RR
–
66
65
80
–
–
3 S – 0.3 1.0 %/1.0 k
θJC
= –40° to +125°C, for LM317BT, BD2T.
– 5.0 – °C/W
mV
% V
mV
% V
dB
Hrs.
max
O
O
O
A
O
2
MOTOROLA ANALOG IC DEVICE DATA
125k
31
0
310 230 120
12.4k
135
LM317
Representative Schematic Diagram
5.6k
6.7k
5.0pF
12k
6.8k
510
170
160
200
6.3V
13k
6.3V
V
in
6.3V
190
V
CC
*
* Pulse testing required.
* 1% Duty Cycle
* is suggested.
3.6k 5.8k 110 5.1k
This device contains 29 active transistors.
Figure 1. Line Regulation and ∆I
V
IH
V
IL
V
in
C
0.1
µ
in
F
30
pF
LM317
I
Adj
30
pF
Line Regulation (%
Adjust
2.4k
12.5k
/Line T est Circuit
Adj
ńV)+
V
out
240
R
1
1%
|VOH–VOL|
|VOL|
+
1.0
O
µ
x 100
FC
105
4.0
0.1
V
out
Adjust
V
OH
V
OL
R
L
MOTOROLA ANALOG IC DEVICE DATA
R
1%
2
3
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