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LM338 Dataheets PDF



Part Number LM338
Manufacturers Linear Technology
Logo Linear Technology
Description 5A Positive Adjustable Voltage Regulator
Datasheet LM338 DatasheetLM338 Datasheet (PDF)

OBSOLETE: FOR INFORMATION PURPOSES ONLY Contact Linear Technology for Potential Replacement Features nn Guaranteed 1% Initial Tolerance nn Guaranteed 0.3% Load Regulation nn Guaranteed 5A Output Current nn 100% Thermal Limit Burn-In nn 12A Transient Output Current Applications nn High Power Linear Regulator nn Battery Chargers nn Power Driver nn Constant-Current Regulator Typical Application Parallel Regulators for Higher Current* LT338A 0.01Ω∗∗ VIN VIN VOUT ADJ 5V 8A LT350A VIN VOUT ADJ.

  LM338   LM338


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OBSOLETE: FOR INFORMATION PURPOSES ONLY Contact Linear Technology for Potential Replacement Features nn Guaranteed 1% Initial Tolerance nn Guaranteed 0.3% Load Regulation nn Guaranteed 5A Output Current nn 100% Thermal Limit Burn-In nn 12A Transient Output Current Applications nn High Power Linear Regulator nn Battery Chargers nn Power Driver nn Constant-Current Regulator Typical Application Parallel Regulators for Higher Current* LT338A 0.01Ω∗∗ VIN VIN VOUT ADJ 5V 8A LT350A VIN VOUT ADJ 0.016Ω** 121Ω 1% 365Ω 1% 138/338 TA01 *THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES **CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1% LT138A/LT338A LM138/LM338 5A Positive Adjustable Voltage Regulator Description The LT®138A series of adjustable regulators provide 5A output current over an output voltage range of 1.2V to 32V. The internal voltage reference is trimmed to less than 1%, enabling a very tight output voltage. In addition to excellent line and load regulation, with full overload protection, the LT138A incorporates new current limiting circuitry allowing large transient load currents to be handled for short periods. Transient load currents of up to 12A can be supplied without limiting, eliminating the need for a large output capacitor. The LT138A is an improved version of the popular LM138 with improved circuit design and advanced process techniques to provide superior performance and reliability. The graph below shows the significant improvement in output voltage tolerance achieved by using the LT138A or LT338A. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. OUTPUT VOLTAGE ERROR (%) Output Voltage Error 12 11 10 9 8 2% RESISTORS LM338 7 6 1% RESISTORS LM338 5 LT338A 4 2% RESISTORS 3 LT338A 2 1% RESISTORS 1 0 1 10 100 OUTPUT VOLTAGE (V) 138A/338A TA02 For more information www.linear.com/LT138A 138afd 1 LT138A/LT339A LM138/LM338 Absolute Maximum Ratings (Note 1) Power Dissipation............................... Internally Limited Input-to-Output Voltage Differential.......................... 35V Operating Junction Temperature Range LT138A/LM138.................................. – 55°C to 150°C LT338A/LM338..................................... 0°C to 125°C Storage Temperature Range.................. –65°C to 150°C Lead Temperature (Soldering, 10 sec).................... 300°C Preconditioning 100% Thermal Limit Burn-In Pin Configuration BOTTOM VIEW VIN 2 1 CASE IS OUTPUT ADJ (GND*) K PACKAGE 2-LEAD TO-3 METAL CAN TJMAX = 150°C, θJA = 35°C/W, θJA = 1°C/W (LT138A/LT138) TJMAX = 125°C, θJA = 35°C/W, θJA = 1°C/W (LT338A/LT338) OBSOLETE PACKAGE FRONT VIEW 3 2 1 P PACKAGE 3-LEAD PLASTIC TO-3P TJMAX = 125°C, θJA = 45°C/W OBSOLETE PACKAGE VIN VOUT ADJ 138afd 2 For more information www.linear.com/LT138A LT138A/LT338A LM138/LM338 E lectrical Characteristics The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) SYMBOL PARAMETER CONDITIONS LT138A MIN TYP MAX LM138 MIN TYP MAX VREF Reference Voltage ΔVOUT ΔVIN ΔVOUT ΔVOUT Line Regulation Load Regulation Thermal Regulation IOUT = 10mA, TJ = 25°C 3V ≤ (VIN – VOUT) ≤ 35V, 10mA ≤ IOUT ≤ 5A, P ≤ 50W 3V ≤ (VIN – VOUT) ≤ 35V, (Note 3) 10mA ≤ IOUT ≤ 5A, (Note 3) VOUT ≤ 5V VOUT ≥ 5V VOUT ≤ 5V VOUT ≥ 5V 20ms Pulse l l l l 1.238 1.225 1.250 1.250 0.005 0.02 5 0.1 20 0.3 0.002 1.262 1.270 1.119 1.24 0.01 0.005 0.04 0.02 15 5 0.3 0.1 30 20 0.6 0.3 0.01 0.002 1.29 0.01 0.04 15 0.3 30 0.6 0.01 IADJ ΔIADJ ISC Ripple Rejection Adjust Pin Current Adjust Pin Current Change Minimum Load Current Current Limit VOUT = 10V, f = 120Hz CADJ = 0µF CADJ = 10µF 10mA ≤ IOUT ≤ 5A, 3V ≤ (VIN – VOUT) ≤ 35V (VIN – VOUT) = 35V (VIN – VOUT) ≤ 10V DC 0.5ms Peak l l 60 60 75 60 60 75 l 45 100 45 100 l 0.2 5 0.2 5 l 3.5 5 3.5 5 l5 l6 8 12 58 6 12 ΔVOUT ΔTemp Temperature Stability (VIN – VOUT) = 30V, TJ = 25ºC l 12 12 1 1 ΔVOUT ΔTime Long-Term Stability TA = 125ºC, 1000 Hours 0.3 1 0.3 1 en RMS Output Noise (% of VOUT) 10HZ ≤ f ≤ 10kHz θJC Thermal Resistance Junction-to-Case K Package 0.001 1 0.003 1 UNITS V V %/V %/V mV % mV % %/W dB dB µA µA mA A A A % % % ºC/W The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. SYMBOL PARAMETER CONDITIONS LT138A LM138 MIN TYP MAX MIN TYP MAX UNITS VREF Reference Voltage ΔVOUT ΔVIN ΔVOUT ΔVOUT Line Regulation Load Regulation Thermal Regulation IOUT = 10mA 1.238 1.250 1.262 3V ≤ (VIN – VOUT) ≤ 35V, 10mA ≤ IOUT ≤ 5A, P ≤ 50W l 1.225 1.250 1.270 1.19 1.24 1.29 3V ≤ (VIN – VOUT) ≤ 35V, (Note 3) l 0.005 0.01 0.02 0.04 0.005 0.03 0.02 0.06 10mA ≤ IOUT ≤ 5A, (Note 3) VOUT ≤ 5V VOUT ≥ 5V VOUT ≤ 5V VOUT ≥ 5V 20ms Pulse l l 5 0.1 20 0.3 0.002 15 0.3 30 0.6 0..


LM338 LM338 LM339


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