LM317,

Part: LM317 (LM317BD2TG, LM317BTG, LM317D2TG, LM317TG, NCV317B variants) — onsemi

Type: Adjustable Positive Linear Voltage Regulator

Description: 1.2–37 V adjustable output, 1.5 A 3-terminal positive linear regulator with internal current limiting, thermal shutdown and safe-area compensation.

Operating Conditions:

• Output voltage range: 1.2 V to 37 V
• Input-output voltage differential: up to 40 V
• Operating junction temperature: 0 to +125 °C (LM317 non-B suffix); -40 to +125 °C (B suffix); -55 to +150 °C (NCV317B) — grade-dependent, see ordering table
• Output current: in excess of 1.5 A

Absolute Maximum Ratings:

• Input-output voltage differential: -0.3 to 40 V
• Operating junction temperature range: -55 to +150 °C
• Storage temperature: -65 to +150 °C
• Power dissipation: internally limited

Key Specs:

• Reference voltage (Vref): 1.2 / 1.25 / 1.3 V (min/typ/max), 3.0 V ≤ VI-VO ≤ 40 V, 10 mA ≤ IO ≤ Imax
• Line regulation: 0.01 %/V typ, 0.04 %/V max (TA = +25 °C, 3.0 V ≤ VI-VO ≤ 40 V)
• Load regulation: 5 mV typ, 25 mV max for VO ≤ 5 V (TA = +25 °C); 0.1 % VO typ, 0.5 % VO max for VO ≥ 5 V
• Adjustment pin current: 50 μA typ, 100 μA max
• Minimum load current: 3.5 mA typ, 10 mA max (VI-VO = 40 V)
• Maximum output current: 1.5 A min, 2.2 A typ (VI-VO ≤ 15 V); 0.15 A min, 0.4 A typ (VI-VO = 40 V, TA = +25 °C)
• Ripple rejection (VO = 10 V, 120 Hz): 65 dB typ without CAdj; 66 dB min, 80 dB typ with CAdj = 10 μF
• RMS noise: 0.003 % VO typ (10 Hz–10 kHz)
• Thermal shutdown: 180 °C typ
• Thermal resistance: RθJC 5.0 °C/W; θJA 65 °C/W (TO-220), 70 °C/W (D²PAK)

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
• NCV prefix for automotive, AEC-Q100 qualified and PPAP capable
• Pb-free, halogen free/BFR free, RoHS compliant

Applications:

• Local on-card regulation
• Programmable output regulator
• Precision current regulator
• Adjustable laboratory power supplies and current limiters

Package:

• D²PAK-3 (Case 936)
• TO-220 (3-lead)

• 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

$$V_{out} = 1.25,V\left(1 + \frac{R_2}{R_1}\right) + I_{Adj},R_2$$

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

Figure 1. Standard Application

D 2 PAK-3 D2T SUFFIX CASE 936

Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.

Heatsink surface connected to Pin 2.

(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.)

1. Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.

2. 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 of output change per watt of power change in a specified time.

3. CAdj , when used, is connected between the adjustment pin and ground.

4. Thermal characteristics are not subject to production test.

5. 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.

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 9. Adjustment Pin Current

Figure 8. Current Limit

Figure 11. Temperature Stability

Figure 10. Dropout Voltage

Figure 12. Minimum Operating Current

Figure 13. Ripple Rejection versus Output Voltage

Figure 15. Ripple Rejection versus Frequency

Figure 14. Ripple Rejection versus Output Current

Figure 16. Output Impedance

Figure 17. Line Transient Response

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.