Maker : Cystech Electonics
Part No. : LM317E3

Datasheet PDF : LM317E3.pdf
Cross Reference : LM317E3 Cross Reference
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Product Information

CYStech Electronics Corp. Three Terminal Adjustable Output Positive Voltage Regulators Spec. No. : C513E3 www.DataSheet4U.com Issued Date : 2003.04.09 Revised Date :2005.05.17 Page No. : 1/10 LM317E3 The LM317E3 is an adjustable 3–terminal positive voltage regulator capable of supplying in excess of 1.5 A 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 LM317E3 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 LM317E3 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 TO-220AB Standard Application Vin PL317 LM317 + Vout R1 + ＊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. IAdj R2 Cin Cout 0.1µF 1.0µF 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. Maximum Ratings Rating Input-Output Voltage Differential Power Dissipation TA=25℃ Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Operating Junction Temperature Range Storage Temperature Range LM317E3 Symbol VI-VO PD θJA θJC TJ Tstg Value 40 Internally Limited 65 5.0 -40 to +125 -65 to +150 Unit V W ℃/W ℃/W ℃ ℃ CYStek Product Specification CYStech Electronics Corp. Spec. No. : C513E3 www.DataSheet4U.com Issued Date : 2003.04.09 Revised Date :2005.05.17 Page No. : 2/10 Electrical Characteristics(VI-VO=5V,IO=0.5A,TJ=0 to 125℃, unless otherwise noted) Characteristics Line Regulation(Note 1) Load Regulation(Note 1) Symbol Conditions Reg line TA=25℃,3.0V≤VI-VO≤40V Reg load TA=25℃,10mA≤IO≤1.5A VO≤5.0V VO≥5.0V Thermal Regulation(Note 4) Reg therm TA=25℃, 20ms pulse Adjust Pin Current IAdj 2.5V≤VI-VO≤40V,10mA≤IL≤1.5A Adjust Pin Current Change ∆IAdj PD≤20W 3.0V≤VI-VO≤40V,10mA≤IO≤1.5A Reference Voltage Vref PD≤20W Temperature Stability Ts 0≤TJ≤125℃ Minimum Load Current to ILmin VI-VO=40V maintain Regulation Maximum Output Current Imax VI-VO≤15V,PD≤20W VI-VO≤40V,PD≤20W,TA=25℃ % of VO,TA=25℃,10Hz≤f≤10kHz RMS Noise N Ripple Rejection(Note 2) RR VO=10V,f=120Hz Without CAdj CAdj=10µF Long-Term Stability(Note 3) S TJ=125℃,TA=25℃ for endpoint measurements Min 1.2 1. 5 0.15 66 Typ 0.01 5.0 0.1 0.03 50 0.2 1.25 0.7 3.5 2.2 0.4 0.003 65 80 0.3 Max 0.04 25 0.5 0.07 100 5.0 1.3 10 1.0 Unit %/V mV %VO %VO/W µA µA V %VO mA A %VO dB %/1.0k Hrs Notes:1.Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 2.CAdj, when used, is connected between the adjustment pin and ground. 3.Since long-term stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 4.Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage o...

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