LM317BT

Part: LM317, NCV317 from onsemi

Type: Adjustable Positive Voltage Regulator

Description: The LM317 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, featuring internal current limiting, thermal shutdown, and safe area compensation.

Operating Conditions:

• Supply voltage: 3.0–40 V (Input-Output Differential)
• Operating temperature: -55 to +150 °C (Junction)
• Output voltage range: 1.2 V to 37 V

Absolute Maximum Ratings:

• Max supply voltage: 40 V (Input-Output Voltage Differential)
• Max continuous current: 1.5 A (Output)
• Max junction/storage temperature: +150 °C

Key Specs:

• Output Voltage Range: 1.2 V to 37 V
• Maximum Output Current (I_max): 1.5 A (Min, V_I - V_O ≤ 15 V, P_D ≤ P_max, T Package)
• Reference Voltage (V_ref): 1.2 V (Min) to 1.3 V (Max)
• Line Regulation: 0.04 %/V (Max, T_A = +25 °C, 3.0 V ≤ V_I - V_O ≤ 40 V)
• Load Regulation: 25 mV (Max, T_A = +25 °C, 10 mA ≤ I_O ≤ I_max, V_O ≤ 5.0 V)
• Adjustment Pin Current (I_Adj): 100 μA (Max)
• Minimum Load Current to Maintain Regulation (I_Lmin): 10 mA (Max, V_I - V_O = 40 V)
• Ripple Rejection (RR): 66 dB (Min, V_O = 10 V, f = 120 Hz, Without C_Adj)

Features:

• Output Adjustable between 1.2 V and 37 V
• Output Current in Excess of 1.5 A
• Internal Thermal Overload Protection
• Output Transistor Safe-Area Compensation
• Internal Short Circuit Current Limiting Constant with Temperature
• Floating Operation for High Voltage Applications
• Available in Surface Mount D2PAK-3, and Standard 3-Lead Transistor Package
• Eliminates Stocking many Fixed Voltages
• NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q100 Qualified and PPAP Capable
• These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant

Applications:

• Local, on card regulation
• Programmable output regulator
• Precision current regulator

Package:

• D2PAK-3
• TO-220

• Output Adjustable between 1.2 V and 37 V
• Output Current in Excess of 1.5 A
• Internal Thermal Overload Protection
• Output Transistor Safe -Area Compensation
• Internal Short Circuit Current Limiting Constant with Temperature
• Floating Operation for High Voltage Applications
• Available in Surface Mount D 2 PAK -3, and Standard 3 -Lead Transistor Package
• Eliminates Stocking many Fixed Voltages
• NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC -Q100 Qualified and PPAP Capable
• These Devices are Pb -Free, Halogen Free/BFR Free and are RoHS Compliant

Since I Adj is controlled to less than 100 m A, the error associated with this term is negligible in most applications.

(V I -VO = 5.0 V; I O = 0.5 A for D2T and T packages; T J = T low to T high (Note 1); I max and P max (Note 2); unless otherwise noted.)

This device contains 29 active transistors.

Figure 2. Representative Schematic Diagram

Figure 3. Line Regulation and D I Adj /Line Test Circuit

Figure 4. Load Regulation and D I Adj /Load Test Circuit

Figure 5. Standard Test Circuit

Figure 6. Ripple Rejection Test Circuit

Figure 7. Load Regulation

Figure 7. Load Regulation

Figure 9. Adjustment Pin Current

Figure 11. Temperature Stability

Figure 8. Current Limit

Figure 10. Dropout Voltage

Figure 12. Minimum Operating Current

Figure 13. Ripple Rejection versus Output Voltage

Figure 13. Ripple Rejection versus Output Voltage

Figure 15. Ripple Rejection versus Frequency

Figure 17. Line Transient Response

Figure 14. Ripple Rejection versus Output Current

Figure 16. Output Impedance

Figure 18. Load Transient Response

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.