KA317 / LM317 3-Terminal Positive Adjustable Regulator September 2014 KA317 / LM317 3-Terminal Positive Adjustable Regulator Description Features This monolithic integrated circuit is an adjustable 3-termi- Output-Current In Excess of 1.5 A nal positive-voltage regulator designed to supply more Output-Adjustable Between 1.2 V and 37 V than 1.5 A of load current with an output voltage adjust- Internal Thermal Overload Protection able over a 1.2 V to 37 V range. It employs internal cur- Internal Short-Circuit Current Limiting rent limiting, thermal shutdown, and safe area Output-Transistor Safe Operating Area Compensation compensation. TO-220 Package TO-220 Output 1 1. Adj 2. Output 3. Input Ordering Information Product Number Package Packing Method Operating Temperature LM317T TO-220 (Single Gauge) Rail 0C to +125C KA317TU TO-220 (Dual Gauge) Rail 0C to +125C Block Diagram Vin 3 Input Voltage Protection Circuitry Reference R LIMIT Rlimit 2 Vo Output 1 VaVAdjdj ADJ Figure 1. Block Diagram 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com KA317 / LM317 Rev. 1.2.2KA317 / LM317 3-Terminal Positive Adjustable Regulator Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi- tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at T = 25C unless otherwise noted. A Symbol Parameter Value Unit V - V Input-Output Voltage Differential 40 V I O T Lead Temperature 230 C LEAD T Operating Junction Temperature Range 0 to +125 C J T Storage Temperature Range -65 to +125 C STG V /T Temperature Coefficient of Output Voltage 0.02 %/C O Thermal Characteristics Values are at T = 25C unless otherwise noted. A Symbol Parameter Value Units P Power Dissipation Internally Limited W D R Thermal Resistance, Junction to Ambient 80 C/W JA R Thermal Resistance, Junction to Case 5 C/W JC 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com KA317 / LM317 Rev. 1.2.2 2