LM317

LM317 New Product Vishay formerly General Semiconductor 3-Terminal Adjustable Output Positive Voltage Regulators Pin Arrangement TO-263 (LM317CM) 2 3 3 1 1. Adjust 2. Vout 3. Vin Heatsink is connected to pin 2 Description 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. TO-220 (LM317CT) 1 2 Features • Output current in excess of 1.5 ampere • Output adjustable between 1.2V and 37V Standard Application Vin Vout LM317 Cin 0.1µF IADJ R1 Adjust 240Ω R2 Co 1µF • 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 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. Input 3 Functional Block Diagram + -Voltage Reference Protection Circuitry Rlimit Vadj 1 2 Output Ratings at 25°C ambient temperature unless otherwise specified. Maximum Ratings Parameter Symbol Vi-Vo TO-220 TO-263 RθJC PD TJ Tstg Value 40 3.0 3.0 15 0 to +125 –65 to +150 Unit Vdc °C W °C °C www.vishay.com 1 Input-Output Voltage Differential Junction-to-Case Thermal Resistance Power Dissipation, 25°C Case Temperature Operating Junction Temperature Range Storage Junction Temperature Range Document Number 74809 30-Oct-02 LM317 Vishay formerly General 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 Line Regulation (Fig. 1) (3) 3.0V ≤ VI – Vo ≤ 40V Load Regulation (Fig. 2) (3) TJ = 25°C, 10mA ≤ Io ≤ 1.5A Load Regulation (Fig. 2) (3) 10mA ≤ Io ≤ 1.5A Thermal Regulation Adjustment Pin Current (Fig. 3) Adjustment Pin Current Change Reference Voltage (Fig. 3) (4) Temperature Stability (Fig. 3) Min. Load Current to Maintain Regulation (Fig. 3) Maximum Output Current (Fig. 3) RMS Noise, % of Vo Ripple Rejection (Fig. 4) Long-Term Stability (after 1000 hr) Fig. 3 Symbol REG line Conditions TA = 25°C TJ = 0°C thru 125°C Vo ≤ 5.0 Vo ≥ 5.0 Vo ≤ 5.0 Vo ≥ 5.0 TJ = 25°C, 20ms Pulse 10mA ≤ IL ≤ 1.5A 2.5V ≤ VI – Vo ≤ 40V 10mA ≤ Io ≤ 1.5A 3V ≤ VI – Vo ≤ 40V Tlow ≤ TJ ≤ Thigh VI – Vo = 40V VI – Vo ≤ 15V VI – Vo = 40V, TJ = 25°C TJ = 25°C, 10HZ ≤ f ≤ 10KHZ Vo = 10V, f = 120HZ(5) CAdj = 10µF TJ = 125°C(6), TJ = 25°C for Endpoint Measurements Tlow ≤ TJ ≤ Thigh Min. – – – – – – – – – 1.225 – – 1.5 0.15 — — 66 – – Typ. 0.01 0.02 5 0.1 20 0.3 0.03 50 0.2 1.25 1 3.5 2.2 0.4 0.003 65 80 0.3 5.0 Max. 0.04 0.07 25 0.5 70 1.5 0.07 100 5 1.275 – 10 – – – – – 1.0 – Unit %Vo/V mV %Vo mV %Vo %Vo/W µA µA V %Vo mA A %Vo dB % °C/W REG load REG load REG therm IAdj ∆IAdj Vref TS ILmin Imax N RR S RθJC Thermal Resistance Junction to Case Notes: (1) Tlow = 0°C Thigh = 125°C (2) Imax = 1.5A Pmax is internally limited (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 30-Oct-02 LM317 Vishay formerly General Semiconductor Fig. 1 – Line Regulation Test Circuit V V Line Regulation (%/V) = OH -- OL x100 VOL VIH VIL VOH VOL Fig. 2 – Load Regulation and ∆Iadj /Load Test Circuit Load Regulator (mV) = Vo(min. Load) -- Vo(max. Load) Vo(min. Load) -- Vo(max. Load) Load Regulator (%Vo) = x100 Vo(min. Load) VOH (min. Load) VOL (max. Load) IL 240Ω 1% Co R2 1% 1µF Vin LM317 Vout 240Ω 1% VI Vin LM317 Vout IADJ Cin 0.1µF Adjust R1 Co RL 1µF IADJ Cin 0.1µF Adjust R1 RL (min. Load) R2 1% Pulse Testing Required: 1% Duty Cycle is Suggested Pulse Testing Required: 1% Duty Cycle is Suggested Fig. 3 – Standard Test Circuit 24V 14V f = 120HZ Fig. 4 – Ripple Rejection Test Circuit Vin LM317 Vout IL 240 1% Vref Co 1µF ISET R2 1% RL Vo Vin LM317 Vout 240 1% Vo = 10V *D1 IADJ Cin VI 0.1µF Adjust R1 R1 Adjust Cin 0.1µF R2 1% 1N4002 Co CAdj 10µF 1µF RL Vo Pulse Testing Required: 1% Duty Cycle is Suggested To Calculate R2: Vo = ISET R2 + 1.250V Assume ISET = 5.25mA *D1 Discharges CADJ if Output is Shorted to Ground Document Number 74809 30-Oct-02 www.vishay.com 3 LM317 Vishay formerly General Semiconductor Ratings and Characteristic Curves (T 0.6 A = 25°C unless otherwise noted) Fig. 5 – Load Regulation 4 Fig. 6 – Current Limit ∆Vo -- Output Voltage Change (%) 0.4 0 --0.2 IL = 0.5A Io -- Output Current (A) 0.2 3 TJ = 25°C 2 TJ = 150°C 1 TJ = --55°C IL = 1.5A --0.4 --0.6 --0.8 --1.0 --75 VI = 15V Vo = 10V 0 --50 --25 0 25 50 75 100 125 150 175 0 10 20 30 40 Fig. 7 – Adjustment Pin Current 75 3.0 Fig. 8 – Dropout Voltage VI -- Vo -- Input -- Output Voltage Differential (Vdc) IADJ -- Adjustment Pin Current (µA) 70 65 60 55 50 45 40 35 --75 ∆Vo = 100mV 2.5 IL = 1.5A 2.0 IL = 1.0A IL = 500mA 1.5 IL = 200mA IL = 20mA 1.0 --75 --50 --25 0 25 50 75 100 125 150 175 --50 --25 0 25 50 75 100 125 150 175 Fig. 9 – Temperature Stability 1.260 5.0 4.5 Fig. 10 – Minimum Operating Current Vref -- Reference Voltage (V) IO -- Quiescent Current (mA) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 TJ = --55°C 1.250 TJ = 25°C TJ = 150°C 1.240 1.230 1.220 --75 0 --50 --25 0 25 50 75 100 125 150 175 0 10 20 30 40 50 www.vishay.com 4 Document Number 74809 30-Oct-02 LM317 Vishay formerly General Semiconductor Ratings and Characteristic Curves (T 100 CAdj = 10µF A = 25°C unless otherwise noted) Fig. 11 – Ripple Rejection vs. Output Voltage 140 120 Fig. 12 – Ripple Rejection vs. Output Current RR -- Ripple Rejection (db) RR -- Ripple Rejection (db) 80 Without CAdj 60 100 80 60 40 20 0 0.01 VI = 15V Vo = 10V f = 120HZ TJ = 25°C 0.1 CAdj = 10µF 40 VI -- Vo = 5V IL = 500mA f = 120HZ TJ = 25°C 0 5 10 15 20 25 30 35 40 Without CAdj 20 0 1 10 Vo -- Output Voltage (V) Io -- Output Current (A) Fig. 13 – Ripple Rejection vs. Frequency 100 101 Fig. 14 – Output Impedance VI = 15V Vo = 10V IL = 500mA TJ = 25°C RR -- Ripple Rejection (db) 80 CAdj = 10µF 60 Without CAdj Output Impedance (Ω) 100 10--1 Without CAdj 10--2 40 IL = 500mA VI = 15V Vo = 10V TJ = 25°C 100 1K 10K 100K 1M 20 CAdj = 10µF 0 10 10--3 10 100 1K 10K 100K 1M f -- Frequency (Hz) f -- Frequency (Hz) ∆VI -- Input Voltage ∆Vo -- Output Voltage Change (V) Deviation (V) Fig. 15 – Line Transient Response 3 Fig. 16 – Load Transient Response Vo -- Output Voltage Deviation (V) 2 1 0 --1 --2 --3 CL = 0 Without CAdj VI = 15V Vo = 10V INL = 50mA TJ = 25°C CL = 1µF CAdj = 10µF 1.5 1.0 0.5 0 --0.5 --1.0 --1.5 1.0 0.5 0 0 10 20 30 40 VI Vo = 10V IL = 50mA TJ = 25°C CL = 0 Without CAdj CL = 1µF CAdj = 10µF IL -- Load Current (A) 1.5 1.0 0.5 0 0 10 20 30 IL 40 t -- Time (µs) Document Number 74809 30-Oct-02 t -- Time (µs) www.vishay.com 5 LM317 Vishay formerly General Semiconductor TO-220 Case Outline 4.85 ± 0.375 1.27 ± 0.12 10.25 ± 0.25 3.84 ± 0.6 Dia. 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 0.8 ± 0.12 0.387 ± 0.09 2.55 ± 0.375 TO-263 Case Outline 10.29 1.65 20° 4.47 1.27 8.5 15.24 Seating Plane .10 8 ° Max. 2.54 0.8 0.6 2.54 Dimensions in millimeters www.vishay.com 6 Document Number 74809 30-Oct-02