©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.5
Features
• Output Current in Excess of 0.5A
• Output Adjustable Between 1.2V and 37V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe Area Compensation
• Floating Operation for High Voltage Applications
Description
The LM317M is a 3-terminal adjustabl e positi ve voltage
regulator capable of supplying in excess of 500mA over an
output voltage range of 1.2V to 37V. This voltage regulator
is exceptionally easy to use and requires only two external
resistors to set the output voltage.
D-PAK
1. Adj 2. Output 3. Input
1
TO-220 (Single Gauge)
1
2
3
3
2
Internal Block Diagram
Rlimit
3Vin
Vo
1
Voltage
Reference
Vad
j
2
Protection
Circuitry
+
-
Input
Output
LM317M
3-Terminal 0.5A Positive Adjustable Regulator
LM317M
2
Absolute Maximum Ratings
Electrical Characteristics
(VI-VO = 5V, IO = 0.1A, 0°C ≤ TJ ≤ +125°C, PDMAX = 7.5W, unle ss ot he rw ise sp ecified)
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
3. Load and Line regulation are speci fie d at constant junction temperature. Change 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.
Parameter Symbol Value Unit
Input-Output Voltage Differential VI - VO40 V
Power Dissipation PDInternally Limited W
Thermal Resistance Junction-Case (TO- 220)
Thermal Resistance Junction-Air (TO-220)
Thermal Resistance Junction-Air (D-PAK (Note1,2))
RθJC
RθJA
RθJA
5
81
100
°C/W
°C/W
°C/W
Operating Junction Temperature Range Tj0 ~ +125 °C
Storage Temperature Range TSTG -65 ~ +125 °C
Parameter Symbol Conditions Min. Typ. Max. Unit
Line Regulation (Note3) Rline TA = +25°C, 3V ≤ VI −VO ≤ 40 V - 0.01 0.04 %/ V
3V ≤ VI −VO ≤ 40V - 0.02 0.07
Load Regulation (Note3) Rload
TA =+25°C, 10mA ≤ IO ≤ 0.5A
VO ≤ 5V
VO ≥ 5V -5
0.1 25
0.5 mV
%/VO
10mA ≤ IO ≤ 0.5A
VO ≤ 5V
VO ≥ 5V -20
0.3 70
1.5 mV
%/VO
Adjustment Pin Current IADJ --50100 uA
Adjustment Pin Current Change ΔIADJ 3V ≤ VI - VO ≤ 40V
10mA ≤ IO ≤ 0.5A, PD < PDMAX -0.25 uA
Reference Volt ag e VREF 3V < VI - VO < 40V
10mA ≤ IO ≤ 0.5A, PD < PDMAX 1.20 1.25 1.30 V
Temperature Stability STT-- 0.7 - %/VO
Minimum Load Current to
Maintain Regulation IL(MIN) VI - VO = 40V - 3.5 10 mA
Maximum Output Current IO(MAX) VI - VO ≤ 15V, PD < PDMAX 0.5 0.9 -
VI - VO = 40V
PD < PDMAX, TA =+25°C0.15 0.25 - A
RMS Noise, % of VOUT eNTA = +25°C, 10Hz < f < 10kHz - 0.003 - %/VO
Ripple Rejection RR VO = 10V, f = 120Hz
without CADJ
CADJ = 10uF (Note4) 66 65
80 -dB
Long-Term Stability ST TJ = +125°C, 1000Hours - 0.3 1 %/1000Hrs
LM317M
3
Typical Performance Characteristics
Figure 1. Minimum Load Current Figure 2. Peak Output Current vs. Input-Output
Differential Voltage
Figure 3. Adjustment Pin Current vs. Temperature Figure 4. Ripple Rejection vs. Frequency
Figure 5. Load Regulation vs. Temperature Figure 6. Line Re gulation vs. Temperature
LM317M
4
Typical Performance Characteristics (Continued)
Figure 7. Outputvoltage vs. Temperature Figure 8. Thermal Shutdown
LM317M
5
Typical Application
Figure 1. 1 5V Electronic Shutdown Regulator
D1 protects the device during an input short circuit.
Figure 2. Slow Turn-On Regulator
Figure 3. Current Regulator
LM317M
120
Output
Input
1K
KSP2222
720 TTL CONTROL
1.0uF
1N4002
D1
VADJ
VO
MINIMUM VO = 1.25V
+
LM317M Output
Input
KSP2907
50K 1N4001
1.0uF
+
VADJ
VO
240
R2
Output
Input R2
VO
IADJ
VADJ
R1 IO
LM317M
IOMAX VREF
R1
-----------------
⎝⎠
⎛⎞
IADJ 1.25V
R1
----------------
≅+=
IOMAX VREF
R1 R2+
----------------------
⎝⎠
⎛⎞
=IADJ
+1.25V
R1 R2+
----------------------
≅
5mA IO500mA<<
LM317M
6
Mechanical Dimensions
Package Dimensions in millimeters
6.60
±0.20
2.30 ±0.1
0
0.50 ±0.1
0
5.34 ±0.30
0.70 ±0.20
0.60 ±0.20
0.80 ±0.20
9.50 ±0.30
6.10 ±0.20
2.70 ±0.20 9.50 ±0.30
6.10 ±0.20
2.70 ±0.20
MIN0.55
0.76 ±0.10 0.50 ±0.1
0
1.02 ±0.2
0
2.30 ±0.2
0
6.60 ±0.20
0.76 ±0.10
(5.34)
(1.50)
(2XR0.25)
(5.04)
0.89 ±0.10
(0.10) (3.05)
(1.00)
(0.90)
(0.70)
0.91 ±0.10
2.30TYP
[2.30±0.20]
2.30TYP
[2.30±0.20]
MAX0.96
(4.34)(0.50) (0.50)
D-PAK
LM317M
7
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
TO-220 [ SINGLE GAUGE ]
LM317M
9/8/11 0.0m 001
Stock#DS400298
© 2011 Fairchild Semiconductor Corporation
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
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
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.
Ordering Information
Product Number Package Operating Temperature
LM317MDT D-PAK 0 ~ 125°C
LM317MT TO-220 (Single Gauge)
