Order this document by LM317L/D


  
   LOW CURRENT
 THREE–TERMINAL
The LM317L is an adjustable 3–terminal positive voltage regulator ADJUSTABLE POSITIVE
capable of supplying in excess of 100 mA over an output voltage range of VOLTAGE REGULATOR
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 SEMICONDUCTOR
employs internal current limiting, thermal shutdown and safe area TECHNICAL DATA
compensation, making them essentially blow–out proof.
The LM317L 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 Z SUFFIX
output, the LM317L can be used as a precision current regulator. PLASTIC PACKAGE
• Output Current in Excess of 100 mA CASE 29

• Output Adjustable Between 1.2 V and 37 V

Pin 1. Adjust
• Internal Thermal Overload Protection 2. Vout 1
2
• 3. Vin 3
Internal Short Circuit Current Limiting
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications D SUFFIX Pin 1. Vin
• Standard 3–Lead Transistor Package PLASTIC PACKAGE 2. Vout
• Eliminates Stocking Many Fixed Voltages
CASE 751
(SOP–8*)
3.
4.
Vout
Adjust
5. N.C.
6. Vout
7. Vout
8
8. N.C.
1

* SOP–8 is an internally modified SO–8 pack-

age. Pins 2, 3, 6 and 7 are electrically common
to the die attach flag. This internal lead frame
Simplified Application modification decreases package thermal resis-
tance and increases power dissipation capabili-
ty when appropriately mounted on a printed cir-
Vin Vout cuit board. SOP–8 conforms to all external di-
LM317L mensions of the standard SO–8 package.

R1
240
IAdj
Cin* Adjust + C **
O
0.1µF 1.0µF

R2

* Cin is required if regulator is located an appreciable ORDERING INFORMATION

** distance from power supply filter.
** CO is not needed for stability, however, Operating

ǒ Ǔ
** it does improve transient response. Device Temperature Range Package
LM317LD SOP–8
Vout + 1.25 V 1 ) RR21 ) IAdj R2 LM317LZ
TJ = 0° to +125°C
Plastic
LM317LBD SOP–8
Since IAdj is controlled to less than 100 µA, the error TJ = –40° to +125°C
associated with this term is negligible in most applications. LM317LBZ Plastic

 Motorola, Inc. 1996 Rev 1

MOTOROLA ANALOG IC DEVICE DATA 1
 LM317L
MAXIMUM RATINGS
Rating Symbol Value Unit
Input–Output Voltage Differential VI–VO 40 Vdc
Power Dissipation PD Internally Limited W
Operating Junction Temperature Range TJ –40 to +125 °C
Storage Temperature Range Tstg –65 to +150 °C

ELECTRICAL CHARACTERISTICS (VI–VO = 5.0 V; IO = 40 mA; TJ = Tlow to Thigh [Note 1]; Imax and Pmax [Note 2];
unless otherwise noted.)
LM317L, LB
Characteristics Figure Symbol Min Typ Max Unit
Line Regulation (Note 3) 1 Regline – 0.01 0.04 %/V
TA = 25°C, 3.0 V ≤ VI – VO ≤ 40 V

Load Regulation (Note 3), TA = 25°C 2 Regload

10 mA ≤ IO ≤ Imax – LM317L
VO ≤ 5.0 V – 5.0 25 mV
VO ≥ 5.0 V – 0.1 0.5 % VO
Adjustment Pin Current 3 IAdj – 50 100 µA
Adjustment Pin Current Change 1, 2 ∆IAdj – 0.2 5.0 µA
2.5 V ≤ VI – VO ≤ 40 V, PD ≤ Pmax
10 mA ≤ IO ≤ Imax – LM317L
Reference Voltage 3 Vref 1.20 1.25 1.30 V
3.0 V ≤ VI – VO ≤ 40 V, PD ≤ Pmax
10 mA ≤ IO ≤ Imax – LM317L
Line Regulation (Note 3) 1 Regline – 0.02 0.07 %/V
3.0 V ≤ VI – VO ≤ 40 V

Load Regulation (Note 3) 2 Regload

10 mA ≤ IO ≤ Imax – LM317L
VO ≤ 5.0 V – 20 70 mV
VO ≥ 5.0 V – 0.3 1.5 % VO
Temperature Stability (Tlow ≤ TJ ≤ Thigh) 3 TS – 0.7 – % VO
Minimum Load Current to Maintain Regulation (VI – VO = 40 V) 3 ILmin – 3.5 10 mA
Maximum Output Current 3 Imax mA
VI – VO ≤ 6.25 V, PD ≤ Pmax, Z Package 100 200 –
VI – VO ≤ 40 V, PD ≤ Pmax, TA = 25°C, Z Package – 20 –
RMS Noise, % of VO N – 0.003 – % VO
TA = 25°C, 10 Hz ≤ f ≤ 10 kHz

Ripple Rejection (Note 4) 4 RR dB

VO = 1.2 V, f = 120 Hz 60 80 –
CAdj = 10 µF, VO = 10.0 V – 80 –
Long Term Stability, TJ = Thigh (Note 5) 3 S – 0.3 1.0 %/1.0 k
TA = 25°C for Endpoint Measurements Hrs.

Thermal Resistance, Junction–to–Case RθJC – 83 – °C/W

Z Package

Thermal Resistance, Junction–to–Air RθJA – 160 – °C/W

Z Package
NOTES: 1. Tlow to Thigh = 0° to +125°C for LM317L –40° to +125°C for LM317LB
2. Imax = 100 mA Pmax = 625 mW
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.

2 MOTOROLA ANALOG IC DEVICE DATA

 LM317L

Representative Schematic Diagram

Vin

300 300 300 3.0k 30 70 6.8V

0

6.8V

350
18k

8.67k 500
130

40
5.1k 0
200
k

180 180 2.0k 6.0k 10 60 2.5

6.3V pF 10
pF
Vout

2.4k
12.8k 5
0 Adjust

Figure 1. Line Regulation and ∆IAdj/Line Test Circuit

VCC
VOH – VOL
Line Regulation (%/V) = x 100
* VOL
VIH VOH
VIL Vin Vout VOL
LM317L

Adjust R1 240 RL
1%
+
Cin 0.1µF IAdj CO 1µF

* Pulse Testing Required: R2

1% Duty Cycle is suggested. 1
%

MOTOROLA ANALOG IC DEVICE DATA 3

 LM317L

Figure 2. Load Regulation and ∆IAdj/Load Test Circuit

Load Regulation (mV) = VO (min Load) –VO (max Load)

VO (min Load) – VO (max Load)
Load Regulation (% VO) = X
VO (min Load) VO (min Load)
100
VO (max Load)
Vin* Vin Vout
LM317L IL

RL
(max Load)
Adjust 240 RL
R1 1% *
(min Load)
+
Cin 0.1µF IAdj CO 1.0µF

R2
1%

* Pulse Testing Required:

1% Duty Cycle is suggested.

Figure 3. Standard Test Circuit

Vin Vout
LM317L IL

Adjust
240
R1 1% Vref RL
IAdj +
VI Cin 0.1µF CO 1µF VO

ISET

R2
1%

To Calculate R2:
Pulse Testing Required: Vout = ISET R2 + 1.250 V
1% Duty Cycle is suggested. Assume ISET = 5.25 mA

Figure 4. Ripple Rejection Test Circuit

14.30V

Vin Vout Vout = 1.25 V

4.30V
LM317L
f = 120 Hz

D1 *
Adjust R1 240 RL
1% 1N4002
+
Cin 0.1µF CO 1µF VO

+
1.65K 10µF
R2 1% **

* D1 Discharges CAdj if Output is Shorted to Ground. **CAdj provides an AC ground to the adjust pin.

4 MOTOROLA ANALOG IC DEVICE DATA

 LM317L

∆ V out, OUTPUT VOLTAGE CHANGE (%) Figure 5. Load Regulation Figure 6. Ripple Rejection

0.4 Vin = 45 V

RR, RIPPLE REJECTION (dB)

Vout = 5.0 V
0.2 IL = 5.0 mA to 40 mA 80
0

–0.2 70
Vin = 10 V IL = 40 mA
–0.4 Vout = 5.0 V f = 120 Hz
–0.6 IL = 5.0 mA to 100 mA 60 Vout = 10 V
Vin = 14 V to 24 V
–0.8

–1.0 50
–50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C)

Figure 7. Current Limit Figure 8. Dropout Voltage

0.50 2.5
V in –Vout , INPUT–OUTPUT VOLTAGE
TJ = 25°C
IO, OUTPUT CURRENT (A)

0.40
2.0
IL = 100 mA
DIFFERENTIAL (V)

0.30
1.5
0.20 TJ = 150°C
IL = 5.0 mA
1.0
0.10

0 0.5
0 10 20 30 40 50 –50 –25 0 25 50 75 100 125 150
Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V) TJ, JUNCTION TEMPERATURE (°C)

Figure 9. Minimum Operating Current Figure 10. Ripple Rejection versus Frequency
5.0 100
4.5 90
IB , QUIESCENT CURRENT (mA)

RR, RIPPLE REJECTION (dB)

4.0 TJ = 55°C IL = 40 mA
80
TJ = 25°C Vin = 5.0 V ± 1.0 VPP
3.5 TJ = 150°C 70 Vout = 1.25 V
3.0 60
2.5 50
2.0 40
1.5 30
1.0 20
0.5 10

0 10 20 30 40 10 100 1.0 k 10 k 100 k 1.0 M

Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V) f, FREQUENCY (Hz)

MOTOROLA ANALOG IC DEVICE DATA 5

 LM317L

Figure 11. Temperature Stability Figure 12. Adjustment Pin Current

1.260 80

IAdj, ADJUSTMENT PIN CURRENT ( µA)

70 Vin = 6.25 V
V ref , REFERENCE VOLTAGE (V)

Vout = Vref
1.250 65 IL = 10 mA
IL = 100 mA
60

1.240 55

50
Vin = 4.2 V
1.230 Vout = Vref 45
IL = 5.0 mA
40

1.220 35
–50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C)

Figure 13. Line Regulation Figure 14. Output Noise

∆ Vout , OUTPUT VOLTAGE CHANGE (%)

0.4 Vin = 4.25 V to 41.25 V

Vout = Vref Bandwidth 100 Hz to 10 kHz
0.2 IL = 5 mA
NOISE VOLTAGE ( µV) 10
0

–0.2 8.0

–0.4

–0.6 6.0

–0.8

–1.0 4.0
–50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C)
∆ Vout , OUTPUT VOLTAGE

Figure 15. Line Transient Response Figure 16. Load Transient Response
∆ Vout , OUTPUT VOLTAGE
DEVIATION (V)

DEVIATION (V)

1.5 0.3
1.0 0.2 CL = 1 µF; CAdj = 10 µF
0.5 CL = 1 µF 0.1
0 0 Vin = 15 V
Vout = 10 V
–0.5 –0.1 INL = 50 mA
Vout = 1.25 V CL = 0.3 µF; CAdj = 10 µF
–1.0 –0.2 TJ = 25°C
∆ Vin , INPUT VOLTAGE

IL = 20 mA
–1.5 TJ = 25°C CL = 0 –0.3
CURRENT (mA)
CHANGE (V)

I L , LOAD

1.0 100
Vin IL
0.5 50
0 0
0 10 20 30 40 0 10 20 30 40
t, TIME (µs) t, TIME (µs)

6 MOTOROLA ANALOG IC DEVICE DATA

 LM317L
APPLICATIONS INFORMATION
Basic Circuit Operation External Capacitors
The LM317L is a 3–terminal floating regulator. In A 0.1 µF disc or 1.0 µF tantalum input bypass capacitor
operation, the LM317L develops and maintains a nominal (Cin) is recommended to reduce the sensitivity to input line
1.25 V reference (Vref) between its output and adjustment impedance.
terminals. This reference voltage is converted to a The adjustment terminal may be bypassed to ground to
programming current (IPROG) by R1 (see Figure 13), and this improve ripple rejection. This capacitor (CAdj) prevents ripple
constant current flows through R2 to ground. The regulated from being amplified as the output voltage is increased. A
output voltage is given by: 10 µF capacitor should improve ripple rejection about 15 dB
R2 at 120 Hz in a 10 V application.
Vout = Vref (1 + ) + IAdj R2 Although the LM317L is stable with no output capacitance,
R1
like any feedback circuit, certain values of external
Since the current from the adjustment terminal (IAdj) capacitance can cause excessive ringing. An output
represents an error term in the equation, the LM317L was capacitance (CO) in the form of a 1.0 µF tantalum or 25 µF
designed to control IAdj to less than 100 µA and keep it aluminum electrolytic capacitor on the output swamps this
constant. To do this, all quiescent operating current is effect and insures stability.
returned to the output terminal. This imposes the requirement
for a minimum load current. If the load current is less than this Protection Diodes
minimum, the output voltage will rise. When external capacitors are used with any IC regulator it
Since the LM317L is a floating regulator, it is only the is sometimes necessary to add protection diodes to prevent
voltage differential across the circuit which is important to the capacitors from discharging through low current points
performance, and operation at high voltages with respect to into the regulator.
ground is possible. Figure 14 shows the LM317L with the recommended
protection diodes for output voltages in excess of 25 V or high
capacitance values (CO > 10 µF, CAdj > 5.0 µF). Diode D1
Figure 17. Basic Circuit Configuration
prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
Vin Vout
LM317L
discharging through the IC during an output short circuit. The
+ combination of diodes D1 and D2 prevents CAdj from
R1 discharging through the IC during an input short circuit.
Vref
Adjust IPROG
Vout Figure 18. Voltage Regulator with
Protection Diodes
IAdj
R2 D1

Vref = 1.25 V Typical 1N4002

Vin Vout
LM317L
Load Regulation +
The LM317L is capable of providing extremely good load Cin R1 D2 CO
regulation, but a few precautions are needed to obtain Adjust
maximum performance. For best performance, the 1N4002
programming resistor (R1) should be connected as close to R2 CAdj
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.

MOTOROLA ANALOG IC DEVICE DATA 7

 LM317L

Figure 19. Adjustable Current Limiter Figure 20. 5 V Electronic Shutdown Regulator

+25V Vout R1 VO IO D1
LM317L
Vin 1.25k 1N4002
Vin Vout
LM317L
Adjust D1
R2 1N914 +
120 1.0µF
* To provide current limiting of IO 500 D2
to the system ground, the source of 1N914 Adjust
the current limiting diode must be tied to MPS2222
a negative voltage below – 7.25 V. 720 TTL
1.0k Control
1N5314
Vref
R2 ≥
IDSS Minimum Vout = 1.25 V
Vref VSS*
R1 =
IOmax + IDSS
D1 protects the device during an input short circuit.
VO < POV + 1.25 V + VSS
ILmin – IP < IO < 100 mA – IP
As shown O < IO < 95 mA

Figure 21. Slow Turn–On Regulator Figure 22. Current Regulator

Vin Vout Iout

LM317L Vin R1 R2
LM317L
240 1N4002 Vout

Adjust 50k Adjust IAdj

R2 MPS2907 +
10µF
Ioutmax =
Vref
R1
+ IAdj ^ 1.25R1 V

Ioutmax =
Vref
R1 + R2
+ IAdj ^ R1.25 V
1 + R2

5.0 mA < Iout < 100 mA

8 MOTOROLA ANALOG IC DEVICE DATA

 LM317L
OUTLINE
DIMENSIONS

Z SUFFIX
PLASTIC PACKAGE
CASE 29–04
ISSUE AD
NOTES:
A B 1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. CONTOUR OF PACKAGE BEYOND DIMENSION R
R IS UNCONTROLLED.
4. DIMENSION F APPLIES BETWEEN P AND L.
P DIMENSION D AND J APPLY BETWEEN L AND K
MINIMUM. LEAD DIMENSION IS UNCONTROLLED
L IN P AND BEYOND DIMENSION K MINIMUM.
SEATING F
PLANE K INCHES MILLIMETERS
DIM MIN MAX MIN MAX
A 0.175 0.205 4.45 5.20
B 0.170 0.210 4.32 5.33
C 0.125 0.165 3.18 4.19
X X D D 0.016 0.022 0.41 0.55
F 0.016 0.019 0.41 0.48
G
G 0.045 0.055 1.15 1.39
H J H 0.095 0.105 2.42 2.66
J 0.015 0.020 0.39 0.50
V C K 0.500 ––– 12.70 –––
L 0.250 ––– 6.35 –––
SECTION X–X N 0.080 0.105 2.04 2.66
1 N P ––– 0.100 ––– 2.54
R 0.115 ––– 2.93 –––
N V 0.135 ––– 3.43 –––

D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SOP–8)
ISSUE R

NOTES:
A D 1. DIMENSIONING AND TOLERANCING PER ASME
C
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETERS.
8 5 3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
E H 0.25 M B M
5. DIMENSION B DOES NOT INCLUDE MOLD
1 PROTRUSION. ALLOWABLE DAMBAR
4 PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
h X 45 _
B q MILLIMETERS
e DIM MIN MAX
A 1.35 1.75
A A1 0.10 0.25
C B 0.35 0.49
SEATING C 0.18 0.25
PLANE D 4.80 5.00
L E 3.80 4.00
0.10 e 1.27 BSC
H 5.80 6.20
A1 B h 0.25 0.50
L 0.40 1.25
0.25 M C B S A S
q 0_ 7_

MOTOROLA ANALOG IC DEVICE DATA 9

 LM317L
NOTES

10 MOTOROLA ANALOG IC DEVICE DATA

 LM317L
NOTES

MOTOROLA ANALOG IC DEVICE DATA 11

 LM317L

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*LM317L/D*
12 ◊ MOTOROLA ANALOG IC DEVICE DATA
LM317L/D