LM317L3 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – Three Terminal Adjustable Output Positive Voltage Regulators

CYStech Electronics Corp.
Three Terminal Adjustable Output
Positive Voltage Regulators
LM317L3
Spec. No. : C513L3
Issued Date : 2003.04.09
Revised Date :2005.05.03
Page No. : 1/9
The LM317L3 is an adjustable 3–terminal positive voltage regulator capable of supplying in excess of
1.5A 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 it essentially blow–out proof.
The LM317L3 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 LM317L3 can be used as a precision current regulator.
● Output Current in Excess of 1.5 A
● Output Adjustable between 1.2 V and 37 V
● Internal Thermal Overload Protection
● Internal Short Circuit Current Limiting Constant with Temperature
● Output Transistor Safe–Area Compensation
● Floating Operation for High Voltage Applications
● Eliminates Stocking many Fixed Voltages
Standard Application
Vin
+
Cin
0.1µF
P^LL^M31³7¹⁷
IAdj
R2
Vout
R1
+
Cout
1.0µF
＊Cin is required if regulator is located an appreciate
distance from power supply filter.
＊＊Cout is not needed for stability, however, it does
improve transient response.
Vout=1.25(1+R2/R1)+IAdjR2
Since IAdj is controlled to less than 100 µA, the
error associated with this term is negligible in
most applications.
Package Information
Pin
1
123
2
3
SOT-223
LM317L3
Function
ADJ
OUTPUT
INPUT
CYStek Product Specification