Order this document by LM317L/D
LM317L
Three-Terminal Adjustable
Output Positive Voltage
Regulator
The LM317L is an adjustable 3–terminal positive voltage regulator
capable of supplying in excess of 100 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 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
output, the LM317L can be used as a precision current regulator.
• Output Current in Excess of 100 mA
•
•
•
•
•
•
•
Output Adjustable Between 1.2 V and 37 V
LOW CURRENT
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
Z SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Adjust
2. Vout
3. Vin
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
1
2
3
Output Transistor Safe–Area Compensation
Floating Operation for High Voltage Applications
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8*)
Standard 3–Lead Transistor Package
Eliminates Stocking Many Fixed Voltages
8
1
LM317L
Vin
Vout
Vout
Adjust
N.C.
Vout
Vout
N.C.
* SOP–8 is an internally modified SO–8 package. Pins 2, 3, 6 and 7 are electrically common
to the die attach flag. This internal lead frame
modification decreases package thermal resistance and increases power dissipation capability when appropriately mounted on a printed circuit board. SOP–8 conforms to all external dimensions of the standard SO–8 package.
Simplified Application
Vin
Pin 1.
2.
3.
4.
5.
6.
7.
8.
Vout
R1
240
IAdj
Cin*
0.1µF
Adjust
+ C **
O
1.0µF
R2
* 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.
Vout
ǒ Ǔ
+ 1.25 V 1 ) R2 ) IAdj R2
R1
Since IAdj is controlled to less than 100 µA, the error
associated with this term is negligible in most applications.
ORDERING INFORMATION
Device
LM317LD
LM317LZ
LM317LBD
LM317LBZ
Operating
Temperature Range
TJ = 0° to +125°C
TJ = –40° to +125°C
© Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
Package
SOP–8
Plastic
SOP–8
Plastic
Rev 1
1
