LM317CM & LM317CT Vishay Semiconductor New Product 3-Terminal Adjustable Output Positive Voltage Regulators Pin Arrangement TO-263 (LM317CM) 2 TO-220 1 (LM317CT) 2 3 1 3 1. Adjust 2. Vout 3. Vin Heatsink is connected to pin 2 • Internal thermal overload protection LM317 Cin 0.1µF Features • Output adjustable between 1.2V and 37V Vout IADJ The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5A over an output voltage range of 1.2V to 37V. 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. • Output current in excess of 1.5 ampere Standard Application Vin Description R1 Adjust 240Ω Co 1µF R2 • Internal short-circuit current limiting constant with temperature • Output transistor safe-area compensation • Floating operation for high voltage applications • Eliminates stocking many fixed voltages Notes: Cin is required if regulator is located an appreciable distance from power supply filter. Co is not needed for stability, however, it does improve transient response. Vout = 1.25V (1 + R2 / R1) + IAdj R2 Since IAdj is controlled to less than 100µA, the error associated with this term is negligible in most applications Mechanical Data Case: TO-220 and TO-263 packages Weight: approx. 1.35g Case outlines are on the back page. Functional Block Diagram Input 3 + -Voltage Reference Protection Circuitry Rlimit 2 Output Vadj 1 Maximum Ratings Ratings at 25°C ambient temperature unless otherwise specified. Parameter Symbol Value Unit Vi-Vo 40 Vdc Power Dissipation, 25°C Free-Air Temperature PD 2 W Power Dissipation, 25°C Case Temperature PD 15 W Operating Junction Temperature Range TJ 0 to +125 °C Tstg –65 to +150 °C Input-Output Voltage Differential Storage Junction Temperature Range Document Number 74809 29-Nov-01 www.vishay.com 1 Part Number Vishay Semiconductor Electrical Characteristics – LM317 Vi -Vo = 5V, Io = 0.5A, TJ = Tlow to Thigh (see Note 1), Imax and Pmax per Note 2, unless otherwise noted. Parameter Symbol Line Regulation (Fig. 1) (3) 3.0V ≤ VI – Vo ≤ 40V REG line Load Regulation (Fig. 2) (3) TJ = 25°C, 10mA ≤ Io ≤ 1.5A REG load Load Regulation (Fig. 2) (3) 10mA ≤ Io ≤ 1.5A REG load Thermal Regulation REG therm Adjustment Pin Current (Fig. 3) Conditions Min. Typ. Max. TA = 25°C – 0.01 0.04 TJ = 0°C thru 125°C – 0.02 0.07 Vo ≤ 5.0 – 5 25 mV Vo ≥ 5.0 – 0.1 0.5 %Vo Vo ≤ 5.0 – 20 70 mV Vo ≥ 5.0 – 0.3 1.5 %Vo TJ = 25°C, 20ms Pulse – 0.03 0.07 %Vo/W – 50 100 µA IAdj Unit %Vo/V Adjustment Pin Current Change ∆IAdj 10mA ≤ IL ≤ 1.5A 2.5V ≤ VI – Vo ≤ 40V – 0.2 5 µA Reference Voltage (Fig. 3) (4) Vref 10mA ≤ Io ≤ 1.5A 3V ≤ VI – Vo ≤ 40V 1.225 1.25 1.275 V Temperature Stability (Fig. 3) TS Tlow ≤ TJ ≤ Thigh – 1 – %Vo Min. Load Current to Maintain Regulation (Fig. 3) ILmin VI – Vo = 40V – 3.5 10 mA Maximum Output Current (Fig. 3) Imax VI – Vo ≤ 15V 1.5 2.2 – VI – Vo = 40V, TJ = 25°C 0.15 0.4 – N TJ = 25°C, 10HZ ≤ f ≤ 10KHZ — 0.003 – %Vo RR Vo = 10V, f = 120HZ(5) CAdj = 10µF — 66 65 80 – – dB S TJ = 125°C(6), TJ = 25°C for Endpoint Measurements – 0.3 1.0 % RθJC Tlow ≤ TJ ≤ Thigh – 5.0 – °C/W RMS Noise, % of Vo Ripple Rejection (Fig. 4) Long-Term Stability (after 1000 hr) Fig. 3 Thermal Resistance Junction to Case A Notes: (1) Tlow = 0°C Thigh = 125°C (2) Imax = 1.5A Pmax : TO-220 = 2W, TO-263 = 2W (3) 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. (4) Selected devices with tightened tolerance reference voltage available. (5) CAdj, when used, is connected between the addjustment pin and ground. (6) 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. www.vishay.com 2 Document Number 74809 29-Nov-01 Part Number Vishay Semiconductor Fig. 1 – Line Regulation Test Circuit Fig. 2 – Load Regulation and ∆Iadj /Load Test Circuit V V Line Regulation (%/V) = OH -- OL x100 VOL VIH VIL Vin VOH VOL Vout Load Regulator (mV) = Vo(min. Load) -- Vo(max. Load) Vo(min. Load) -- Vo(max. Load) Load Regulator (%Vo) = x100 Vo(min. Load) VI Vin LM317 IADJ IL LM317 240Ω 1% Adjust R1 IADJ Co RL Cin 0.1µF 1µF Pulse Testing Required: 1% Duty Cycle is Suggested Adjust R1 240Ω 1% Cin RL (min. Load) Co 0.1µF R2 1% VOH (min. Load) VOL (max. Load) Vout 1µF R2 1% Pulse Testing Required: 1% Duty Cycle is Suggested Fig. 3 – Standard Test Circuit Fig. 4 – Ripple Rejection Test Circuit 24V 14V f = 120HZ Vin Vin Vout IL LM317 IADJ VI Adjust R1 240 1% R1 Vref Adjust Cin Co 0.1µF 1µF R2 1% Document Number 74809 29-Nov-01 Vo = 10V 240 1% Cin RL ISET Pulse Testing Required: 1% Duty Cycle is Suggested Vout LM317 1N4002 Co Vo RL 0.1µF CAdj R2 1% To Calculate R2: Vo = ISET R2 + 1.250V Assume ISET = 5.25mA *D1 Vo 1µF 10µF *D1 Discharges CADJ if Output is Shorted to Ground www.vishay.com 3 Part Number Vishay Semiconductor Ratings and Characteristic Curves (T A = 25°C unless otherwise noted) Fig. 6 – Current Limit Fig. 5 – Load Regulation 4 0.4 0.2 IL = 0.5A 0 --0.2 IL = 1.5A --0.4 VI = 15V Vo = 10V --0.6 Io -- Output Current (A) ∆Vo -- Output Voltage Change (%) 0.6 3 TJ = 25°C 2 1 --0.8 --1.0 --75 0 --50 --25 0 25 50 75 0 100 125 150 175 10 Fig. 7 – Adjustment Pin Current 30 40 Fig. 8 – Dropout Voltage VI -- Vo -- Input -- Output Voltage Differential (Vdc) 70 65 60 55 50 45 40 35 --75 20 3.0 75 IADJ -- Adjustment Pin Current (µA) TJ = --55°C TJ = 150°C --50 --25 0 25 50 75 ∆Vo = 100mV 2.5 IL = 1.5A IL = 1.0A 2.0 IL = 500mA 1.5 IL = 200mA IL = 20mA 1.0 --75 100 125 150 175 Fig. 9 – Temperature Stability --50 --25 0 25 50 75 100 125 150 175 Fig. 10 – Minimum Operating Current 5.0 1.260 IO -- Quiescent Current (mA) Vref -- Reference Voltage (V) 4.5 1.250 1.240 1.230 4.0 TJ = 25°C 3.5 TJ = --55°C TJ = 150°C 3.0 2.5 2.0 1.5 1.0 0.5 1.220 --75 0 --50 --25 www.vishay.com 4 0 25 50 75 100 125 150 175 0 10 20 30 40 50 Document Number 74809 29-Nov-01 Part Number Vishay Semiconductor Ratings and Characteristic Curves (T A = 25°C unless otherwise noted) Fig. 12 – Ripple Rejection vs. Output Current Fig. 11 – Ripple Rejection vs. Output Voltage 140 100 120 80 RR -- Ripple Rejection (db) RR -- Ripple Rejection (db) CAdj = 10µF Without CAdj 60 40 VI -- Vo = 5V IL = 500mA f = 120HZ TJ = 25°C 20 0 5 0 10 15 20 25 30 35 CAdj = 10µF 100 80 Without CAdj 60 40 VI = 15V Vo = 10V f = 120HZ TJ = 25°C 20 0 0.01 40 0.1 Fig. 13 – Ripple Rejection vs. Frequency Fig. 14 – Output Impedance 100 101 VI = 15V Vo = 10V IL = 500mA TJ = 25°C 80 Output Impedance (Ω) RR -- Ripple Rejection (db) 10 Io -- Output Current (A) Vo -- Output Voltage (V) CAdj = 10µF 60 Without CAdj 40 IL = 500mA VI = 15V Vo = 10V TJ = 25°C 20 0 10 100 100 10--1 Without CAdj 10--2 CAdj = 10µF 1K 10K 100K 10--3 10 1M 100 f -- Frequency (Hz) 1K 10K 100K 1M f -- Frequency (Hz) Fig. 15 – Line Transient Response Fig. 16 – Load Transient Response Vo -- Output Voltage Deviation (V) 3 1.5 1.0 CL = 1µF CAdj = 10µF 0.5 0 --0.5 Vo = 10V IL = 50mA TJ = 25°C --1.0 2 1 CL = 1µF CAdj = 10µF 0 --1 --2 CL = 0 Without CAdj --3 IL -- Load Current (A) ∆VI -- Input Voltage ∆Vo -- Output Voltage Change (V) Deviation (V) 1 CL = 0 Without CAdj --1.5 1.0 VI 0.5 0 VI = 15V Vo = 10V INL = 50mA TJ = 25°C 1.5 1.0 IL 0.5 0 0 10 20 t -- Time (µs) Document Number 74809 29-Nov-01 30 40 0 10 20 30 40 t -- Time (µs) www.vishay.com 5 Part Number Vishay Semiconductor TO-220 Case Outline 4.85 ± 0.375 10.25 ± 0.25 3.84 ± 0.6 Dia. 1.27 ± 0.12 2.69 ± 0.25 6.26 ± 0.25 14.8 ± 0.51 8.54 ± 0.26 28.7 ± 0.92 3.94 ± 0.375 13.9 ± 0.41 Dimensions in millimeters 2.53 ± 0.185 1.3 ± 0.185 0.387 ± 0.09 2.55 ± 0.375 0.8 ± 0.12 TO-263 Case Outline 10.29 4.47 1.65 20° 1.27 9.14 15.24 Seating Plane .10 8° Max. 2.54 2.54 1.27 0.38 Dimensions in millimeters www.vishay.com 6 Document Number 74809 29-Nov-01