ETC LM317M/D

LM317M
Three-Terminal Adjustable
Output Positive Voltage
Regulator
The LM317M is an adjustable three–terminal positive voltage
regulator capable of supplying in excess of 500 mA 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 LM317M serves a wide variety of applications including local,
on–card regulation. This device also makes an especially simple
adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the
LM317M can be used as a precision current regulator.
• Output Current in Excess of 500 mA
• Output Adjustable between 1.2 V and 37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications
• Eliminates Stocking Many Fixed Voltages
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Heatsink surface
connected to Pin 2
1
2
Vin
Vout
LM317M
*
Cin
0.1µF
IAdj
Vout
SOT–223
ST SUFFIX
CASE 318E
**
+C
O
1.0µF
3
DPAK
DT SUFFIX
CASE 369A
R1
240
Adjust
3
TO–220AB
T SUFFIX
CASE 221A
1
Vin
2
1
2
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
R2
PIN ASSIGNMENT
* = 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.
1
Adjust
2
Vout
3
Vin
R
Vout 1.25 V 1 2 IAdjR2
R1
Since IAdj is controlled to less than 100 µA, the error associated with this
term is negligible in most applications.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
Figure 1. Simplified Application
 Semiconductor Components Industries, LLC, 2001
March, 2001 – Rev. 7
1
Publication Order Number:
LM317M/D
LM317M
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Symbol
Value
Unit
VI–VO
40
Vdc
PD
θJA
θJC
Internally Limited
70
5.0
°C/W
°C/W
PD
θJA
θJC
Internally Limited
92
5.0
°C/W
°C/W
PD
θJA
θJC
Internally Limited
245
15
°C/W
°C/W
Operating Junction Temperature Range
TJ
–40 to +125
°C
Storage Temperature Range
Tstg
–65 to +150
°C
Rating
Input–Output Voltage Differential
Power Dissipation (Package Limitation) (Note 1.)
Plastic Package, T Suffix, Case 221A
TA = 25°C
Thermal Resistance, Junction–to–Air
Thermal Resistance, Junction–to–Case
Plastic Package, DT Suffix, Case 369A
TA = 25°C
Thermal Resistance, Junction–to–Air
Thermal Resistance, Junction–to–Case
Plastic Package, ST Suffix, Case 318E
TA = 25°C
Thermal Resistance, Junction–to–Air
Thermal Resistance, Junction–to–Case
ELECTRICAL CHARACTERISTICS (VI–VO = 5.0 V; IO = 0.1 A, TJ = Tlow to Thigh [Note 2.], unless otherwise noted.)
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 3.)
TA = 25°C, 3.0 V ≤ VI–VO ≤ 40 V
3
Regline
–
0.01
0.04
%/V
Load Regulation (Note 3.)
TA = 25°C, 10 mA ≤ IO ≤ 0.5 A
VO ≤ 5.0 V
VO ≥ 5.0 V
4
Regload
–
–
5.0
0.1
25
0.5
mV
% VO
Adjustment Pin Current
5
IAdj
–
50
100
µA
Adjustment Pin Current Change
2.5 V ≤ VI–VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax
3,4
∆IAdj
–
0.2
5.0
µA
Reference Voltage
3.0 V ≤ VI–VO ≤ 40 V, 10 mA ≤ IO ≤ 0.5 A, PD ≤ Pmax:
5
Vref
1.200
1.250
1.300
Line Regulation (Note 3.)
3.0 V ≤ VI–VO ≤ 40 V
3
Regline
–
0.02
0.07
%/V
Load Regulation (Note 3.)
10 mA ≤ IO ≤ 0.5 A
VO ≤ 5.0 V
VO ≥ 5.0 V
4
Regload
–
–
20
0.3
70
1.5
mV
% VO
Temperature Stability (Tlow ≤ TJ ≤ Thigh)
5
TS
–
0.7
–
% VO
Minimum Load Current to Maintain Regulation
(VI–VO = 40 V)
5
ILmin
–
3.5
10
mA
Maximum Output Current
VI–VO ≤ 15 V, PD ≤ Pmax
VI–VO = 40 V, PD ≤ Pmax, TA = 25°C
5
Imax
0.5
0.15
0.9
0.25
–
–
RMS Noise, % of VO
TA= 25°C, 10 Hz ≤ f ≤ 10 kHz
–
N
–
0.003
–
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4.)
Without CAdj
CAdj = 10 µF
6
RR
–
66
65
80
–
–
Long–Term Stability, TJ = Thigh (Note 5.)
TA= 25°C for Endpoint Measurements
5
–
0.3
1.0
S
V
A
% VO
dB
%/1.0 k
Hrs.
1. Figure 25 provides thermal resistance versus pc board pad size.
2. Tlow to Thigh = 0° to +125°C for LM317M
Tlow to Thigh = –40° to +125°C for LM317MB
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. CAdj, when used, is connected between the adjustment pin and ground.
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.
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2
LM317M
Vin
300
300
300
3.0k
300
70
6.8V
6.8V
350
18k
130
8.67k
500
200k
6.3V
400
5.1k
180
180
2.0k
6.0k
60
10
pF 10
pF
1.25
Vout
2.4k
12.8k
Figure 2. Representative Schematic Diagram
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3
50
Adjust
LM317M
VCC
VOH - VOL
VOL
Line Regulation (%/V) =
*
VIH
VIL
Vin
LM317M
0.1µF
VOH
VOL
Vout
Adjust
Cin
x 100
R1
240
1%
+
CO
IAdj
RL
1.0µF
R2
1%
*Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 3. Line Regulation and ∆IAdj/Line Test Circuit
Load Regulation (mV) = VO (min Load) -VO (max Load)
Load Regulation (% VO) =
Vin
Vin
LM317M
Adjust
Cin
0.1µF
Vout
VO (min Load) - VO (max Load)
VO (min Load)
X 100
VO (min Load)
VO (max Load)
IL
R1
RL
(max Load)
240
1%
CO
IAdj
+
*
1.0µF
R2
1%
*Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 4. Load Regulation and ∆IAdj/Load Test Circuit
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4
RL
(min Load)
LM317M
Vin
Vout
LM317M
IL
Adjust
VI
Cin
IAdj
0.1µF
240
1%
R1
Vref
RL
+
CO
1µF
VO
ISET
R2
1%
To Calculate R2:
Vout = ISET R2 + 1.250 V
Assume ISET = 5.25 mA
*Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 5. Standard Test Circuit
24V
Vin
14V
f = 120 Hz
Vout
LM317M
Adjust
Cin
Vout = 10 V
240
1%
R1
D1 *
1N4002
0.1µF
CO
R2
1.65K
1%
**
CAdj
+
+
RL
1.0µF
10µF
*D1 Discharges CAdj if Output is Shorted to Ground.
**CAdj provides an AC ground to the adjust pin.
Figure 6. Ripple Rejection Test Circuit
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5
VO
LM317M
0.4
Vin = 45 V
Vout = 5.0 V
IL = 5.0 mA to 40 mA
0.2
RR, RIPPLE REJECTION (dB)
∆ V out , OUTPUT VOLTAGE CHANGE (%)
90
0
-0.2
Vin = 10 V
Vout = 5.0 V
IL = 5.0 mA to 100 mA
-0.4
-0.6
-0.8
-1.0
-50
-25
0
25
50
75
100 125
TJ, JUNCTION TEMPERATURE (°C)
80
Without CAdj = 10 µF
70
50
150
-50
-25
Figure 7. Load Regulation
V in -Vout , INPUT-OUTPUT VOLTAGE
DIFFERENTIAL (V)
Iout , OUTPUT CURRENT (A)
0.80
0.60
TJ = 25°C
TJ = 125°C
0.20
0
0
10
20
30
40
Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
IL = 500 mA
2.0
IL = 100 mA
1.5
1.0
0.5
50
-50
90
RR, RIPPLE REJECTION (dB)
IB , QUIESCENT CURRENT (mA)
100
4.5
4.0
3.5
TJ = 25°C
TJ = 125°C
2.0
-25
0
25
50
75
100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 10. Dropout Voltage
5.0
2.5
150
2.5
Figure 9. Current Limit
3.0
0
25
50
75
100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 8. Ripple Rejection
1.0
0.40
Without CAdj
IL = 100 mA
f = 120 Hz
Vout = 10 V
Vin = 14 V to 24 V
60
1.5
1.0
IL = 40 mA
Vin = 5.0 V ± 1.0 VPP
Vout = 1.25 V
80
70
60
50
40
30
20
10
0.5
0
10
20
30
40
Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
10
Figure 11. Minimum Operating Current
100
1.0 k
10 k
100 k 1.0 M
f, FREQUENCY (Hz)
Figure 12. Ripple Rejection versus Frequency
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6
LM317M
1.250
1.240
Vin = 4.2 V
Vout = Vref
IL = 5.0 mA
1.230
1.220
-50
-25
80
IAdj, ADJUSTMENT PIN CURRENT ( µA)
Vref, REFERENCE VOLTAGE (V)
1.260
0
25
50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Vin = 6.25 V
Vout = Vref
IL = 10 mA
IL = 100 mA
70
65
60
55
50
45
40
35
150
-50
-0.2
75
100
125
150
-0.4
-0.6
8.0
6.0
-0.8
-50
-25
0
25
50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
4.0
150
-50
25
50
75
100
∆ Vout , OUTPUT VOLTAGE
DEVIATION (V)
1.5
1.0
Vout = 10 V
IL = 50 mA
TJ = 25°C
-1.0
-1.5
1.0
CL = 1.0 µF; CAdj = 10 µF
Vin = 15 V
Vout = 10 V
INL = 50 mA
TJ = 25°C
CL = 0
Vin
0
10
CL = 0.3 µF; CAdj = 10 µF
-3.0
0.5
20
t, TIME (µs)
150
0
-2.0
-0.5
125
2.0
-1.0
0
0
3.0
I L , LOAD
CURRENT (A)
CL = 1.0 µF
0.5
0
Figure 16. Output Noise
1.5
1.0
-25
TJ, JUNCTION TEMPERATURE (°C)
Figure 15. Line Regulation
∆ Vout , OUTPUT VOLTAGE
DEVIATION (V)
50
Bandwidth 100 Hz to 10 kHz
10
NOISE VOLTAGE ( µV)
∆ Vout , OUTPUT VOLTAGE CHANGE (%)
0
-1.0
∆ Vin , INPUT VOLTAGE
CHANGE (V)
25
Figure 14. Adjustment Pin Current
Vin = 4.25 V to 41.25 V
Vout = Vref
IL = 5.0 mA
0.2
0
TJ, JUNCTION TEMPERATURE (°C)
Figure 13. Temperature Stability
0.4
-25
30
40
1.0
IL
0.5
0
0
10
20
t, TIME (µs)
30
Figure 18. Load Transient Response
Figure 17. Line Transient Response
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7
40
LM317M
APPLICATIONS INFORMATION
Basic Circuit Operation
External Capacitors
The LM317M is a three–terminal floating regulator. In
operation, the LM317M develops and maintains a nominal
1.25 V reference (Vref) between its output and adjustment
terminals. This reference voltage is converted to a
programming current (IPROG) by R1 (see Figure 19), and this
constant current flows through R2 to ground. The regulated
output voltage is given by:
A 0.1 µF disc or 1.0 µF tantalum input bypass capacitor
(Cin) is recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (CAdj) prevents
ripple from being amplified as the output voltage is
increased. A 10 µF capacitor should improve ripple
rejection about 15 dB at 120 Hz in a 10 V application.
Although the LM317M is stable with no output
capacitance, like any feedback circuit, certain values of
external capacitance can cause excessive ringing. An output
capacitance (CO) in the form of a 1.0 µF tantalum or 25 µF
aluminum electrolytic capacitor on the output swamps this
effect and insures stability.
R
Vout Vref 1 2 IAdj R2
R1
Since the current from the terminal (IAdj) represents an
error term in the equation, the LM317M was designed to
control IAdj to less than 100 µA and keep it constant. To do
this, all quiescent operating current is returned to the output
terminal. This imposes the requirement for a minimum load
current. If the load current is less than this minimum, the
output voltage will rise.
Since the LM317M is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
Vin
LM317M
When external capacitors are used with any IC regulator
it is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 20 shows the LM317M with the recommended
protection diodes for output voltages in excess of 25 V or
high capacitance values (CO > 25 µF, CAdj > 5.0 µF). Diode
D1 prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit.
The combination of diodes D1 and D2 prevents CAdj from
discharging through the IC during an input short circuit.
Vout
+
Vref
Adjust
Protection Diodes
R1
IPROG
Vout
IAdj
D1
R2
1N4002
Vref = 1.25 V Typical
Vin
Figure 19. Basic Circuit Configuration
Vout
LM317M
Cin
R1
Vout
+
D2
Adjust
Load Regulation
The LM317M is capable of providing extremely good
load regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
degrading regulation. The ground end of R2 can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
1N4002
R2
CAdj
Figure 20. Voltage Regulator with
Protection Diodes
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8
CO
LM317M
+25V
Vin
Vout
LM317M
1.25k
Adjust
D1
D1
1N914
R2
500
* To provide current limiting of IO
to the system ground, the source of
the current limiting diode must be tied to
a negative voltage below - 7.25 V.
1N4002
Vin
Vin
D2
1N914
Vout
LM317M
Adjust
TTL
Control
1.0k
VSS*
Minimum Vout = 1.25 V
VO < POV + 1.25 V + VSS
ILmin - IP < IO < 500 mA - IP
As shown O < IO < 495 mA
D1 protects the device during an input short circuit.
Figure 21. Adjustable Current Limiter
Vin
1.0µF
MPS2222
720
Vref
IOmax + IDSS
Vout
+
120
1N5314
Vref
R2 ≥
IDSS
R1 =
IO
VO
R1
LM317M
Vout
Figure 22. 5 V Electronic Shutdown Regulator
Vin
Vout
240
LM317M
R2
IAdj
Adjust
MPS2907
+
Ioutmax =
10µF
Iout
R2
Vout
1N4001
50k
Adjust
R1
Vref
R1 + R2
1.25 V
+ IAdj R + R
1
2
5.0 mA < Iout < 100 mA
R θ JA, THERMAL RESISTANCE, JUNCTION-TO-AIR (° C/W)
Figure 23. Slow Turn–On Regulator
100
Minimum
Size Pad
L
60
50
40
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
2.0 oz. Copper
L
80
70
2.4
PD(max) for TA = 50°C
Free Air
Mounted
Vertically
90
Figure 24. Current Regulator
RθJA
0
5.0
10
15
20
25
30
280
2.0
240
1.6
200
1.2
160
0.8
120
0.4
80
0
40
2.50
PD(max) for TA = 50°C
Free Air
Mounted
Vertically
1.25
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
Minimum
Size Pad
2.0 oz. Copper
L
0.83
L
0.63
0.50
0.42
RθJA
0
5.0
10
15
20
25
30
0.35
L, LENGTH OF COPPER (mm)
L, LENGTH OF COPPER (mm)
Figure 25. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
Figure 26. SOT–223 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
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9
LM317M
ORDERING INFORMATION
Operating Temperature Range
Package
Shipping
LM317MT
Device
TJ = 0°C to 125°C
TO–220
50 units/rail
LM317MDT
TJ = 0°C to 125°C
DPAK
75 units/rail
LM317MDTRK
TJ = 0°C to 125°C
DPAK
2500 units/Tape & Reel
LM317MSTT3
TJ = 0°C to 125°C
SOT–223
4000 units/Tape & Reel
LM317MBT
TJ = –40°C to 125°C
TO–220
50 units/rail
LM317MBDT
TJ = –40°C to 125°C
DPAK
75 units/rail
LM317MBDTRK
TJ = –40°C to 125°C
DPAK
2500 units/Tape & Reel
LM317MBSTT3
TJ = –40°C to 125°C
SOT–223
4000 units/Tape & Reel
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10
LM317M
PACKAGE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 221A–09
ISSUE AA
–T–
B
SEATING
PLANE
C
F
T
S
4
DIM
A
B
C
D
F
G
H
J
K
L
N
Q
R
S
T
U
V
Z
A
Q
1 2 3
U
H
K
Z
L
R
V
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.
J
G
D
N
INCHES
MIN
MAX
0.570
0.620
0.380
0.405
0.160
0.190
0.025
0.035
0.142
0.147
0.095
0.105
0.110
0.155
0.018
0.025
0.500
0.562
0.045
0.060
0.190
0.210
0.100
0.120
0.080
0.110
0.045
0.055
0.235
0.255
0.000
0.050
0.045
----0.080
MILLIMETERS
MIN
MAX
14.48
15.75
9.66
10.28
4.07
4.82
0.64
0.88
3.61
3.73
2.42
2.66
2.80
3.93
0.46
0.64
12.70
14.27
1.15
1.52
4.83
5.33
2.54
3.04
2.04
2.79
1.15
1.39
5.97
6.47
0.00
1.27
1.15
----2.04
(SOT–223)
ST SUFFIX
PLASTIC PACKAGE
CASE 318E–04
ISSUE K
A
F
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
4
S
1
2
3
B
D
L
G
J
M
K
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11
INCHES
DIM MIN
MAX
A
0.249
0.263
B
0.130
0.145
C
0.060
0.068
D
0.024
0.035
F
0.115
0.126
G
0.087
0.094
H 0.0008 0.0040
J
0.009
0.014
K
0.060
0.078
L
0.033
0.041
M
0
10 S
0.264
0.287
MILLIMETERS
MIN
MAX
6.30
6.70
3.30
3.70
1.50
1.75
0.60
0.89
2.90
3.20
2.20
2.40
0.020
0.100
0.24
0.35
1.50
2.00
0.85
1.05
0
10 6.70
7.30
LM317M
PACKAGE DIMENSIONS
(DPAK)
DT SUFFIX
PLASTIC PACKAGE
CASE 369A–13
ISSUE AA
–T–
C
B
V
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
SEATING
PLANE
E
R
4
Z
A
S
1
2
3
U
K
F
J
L
H
D
G
2 PL
0.13 (0.005)
M
DIM
A
B
C
D
E
F
G
H
J
K
L
R
S
U
V
Z
INCHES
MIN
MAX
0.235
0.250
0.250
0.265
0.086
0.094
0.027
0.035
0.033
0.040
0.037
0.047
0.180 BSC
0.034
0.040
0.018
0.023
0.102
0.114
0.090 BSC
0.175
0.215
0.020
0.050
0.020
--0.030
0.050
0.138
---
MILLIMETERS
MIN
MAX
5.97
6.35
6.35
6.73
2.19
2.38
0.69
0.88
0.84
1.01
0.94
1.19
4.58 BSC
0.87
1.01
0.46
0.58
2.60
2.89
2.29 BSC
4.45
5.46
0.51
1.27
0.51
--0.77
1.27
3.51
---
T
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