LM317L Datasheet, PDF (1/12 Pages) Texas Instruments – 3-TERMINAL ADJUSTABLE REGULATOR

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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
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications
• Standard 3–Lead Transistor Package
• Eliminates Stocking Many Fixed Voltages
Simplified Application
Vin
Cin*
0.1µF
LM317L
IAdj
Adjust
R2
Vout
R1
240
+ _CO**
1.0µF
LOW CURRENT
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
Z SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Adjust
2. Vout
1
2
3. Vin
3
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8*)
8
1
Pin 1. Vin
2. Vout
3. Vout
4. Adjust
5. N.C.
6. Vout
7. Vout
8. N.C.
* 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
modification decreases package thermal resis-
tance and increases power dissipation capabili-
ty when appropriately mounted on a printed cir-
cuit board. SOP–8 conforms to all external di-
mensions of the standard SO–8 package.
* Cin is required if regulator is located an appreciable
** distance from power supply filter.
** CO is not needed for stability, however,
+ ǒ ) Ǔ ) ^{** it does improve transient response.}
Vout
1.25 V 1
R2
R1
IAdj R2
Since IAdj is controlled to less than 100 µA, the error
associated with this term is negligible in most applications.
MOTOROLA ANALOG IC DEVICE DATA
ORDERING INFORMATION
Operating
Device Temperature Range
Package
LM317LD
LM317LZ
TJ = 0° to +125°C
SOP–8
Plastic
LM317LBD
LM317LBZ ^{TJ = –40° to +125°C}
SOP–8
Plastic
© Motorola, Inc. 1996
Rev 1
1