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ON Semiconductor - LM317LB

Numéro de référence 317LB
Description LM317LB
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317LB fiche technique
ON Semiconductort
100 mA 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
www.DataSheet4U.com
LM317L
LOW CURRENT
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
Z SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Adjust
2. Vout
3. Vin
1
2
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 package.
Pins 2, 3, 6 and 7 are electrically common to the
die attach flag. This internal lead frame modifi-
cation decreases package thermal resistance
and increases power dissipation capability
when appropriately mounted on a printed circuit
board. SOP–8 conforms to all external dimen-
sions of the standard SO–8 package.
ă* 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.
ǒ ǓVout + 1.25āVā
1
)
R2
R1
) IAdjāāR2
Since IAdj is controlled to less than 100 µA, the error
associated with this term is negligible in most applications.
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
© Semiconductor Components Industries, LLC, 2002
January, 2002 – Rev. 3
1
Publication Order Number:
LM317L/D

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