Maker : Linear Technology
Part No. : LM338P

  Datasheet PDF : LM338P.pdf
  Cross Reference : LM338P Cross Reference
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Shortcut : LM338  LM338  LM338  LM338K  LM338K  LM338K  LM338P  LM338T 

Product Information

LT138A/LT338A LM138/LM338 5A Positive Adjustable Voltage Regulator FEATURES s s s s s DESCRIPTIO Guaranteed 1% Initial Tolerance Guaranteed 0.3% Load Regulation Guaranteed 5A Output Current 100% Thermal Limit Burn-In 12A Transient Output Current APPLICATIO S s s s s High Power Linear Regulator Battery Chargers Power Driver Constant-Current Regulator 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. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Parallel Regulators for Higher Current* 12 LT338A VIN VIN ADJ VOUT 0.01Ω** OUTPUT VOLTAGE ERROR (%) 5V 8A 11 10 9 8 7 6 5 4 3 2 1 0 1% RESISTORS 2% RESISTORS LT338A 2% RESISTORS 1% RESISTORS LM338 LM338 LT338A LT350A VIN ADJ VOUT 0.016Ω** 121Ω 1% 365Ω 1% 138/338 TA01 1 *THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES **CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1% U Output Voltage Error 10 OUTPUT VOLTAGE (V) 100 138A/338A TA02 U U 1 LT138A/LT338A LM138/LM338 ABSOLUTE AXI U RATI GS 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 PRECONDITIONI G 100% Thermal Limit Burn-In PACKAGE/ORDER I FOR ATIO BOTTOM VIEW VIN 2 CASE IS OUTPUT 1 ADJ K PACKAGE 2-LEAD TO-3 METAL CAN TJMAX = 150°C, θJA = 35°C/ W, θJC = 1°C/ W (LT138A/LT138) TJMAX = 125°C, θJA = 35°C/ W, θJC = 1°C/ W (LT338A/LT338) ORDER PART NUMBER LT138AK LT338AK LM138K LM338K FRONT VIEW 3 2 1 P PACKAGE 3-LEAD PLASTIC TO-3P TJMAX = 125°C, θJA = 45°C/ W VOUT VIN ADJ Consult factory for Industrial grade parts. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) SYMBOL VREF PARAMETER Reference Voltage CONDITIONS IOUT = 10mA, TJ = 25°C 3V ≤ (VIN – VOUT) ≤ 35V, 10mA ≤ IOUT ≤ 5A, P ≤ 50W ∆VOUT ∆VIN ∆VOUT ∆IOUT Line Regulation Load Regulation 3V ≤ (VIN – VOUT) ≤ 35V, (Note 3) q q ELECTRICAL CHARACTERISTICS MIN 1.238 1.225 LT138A TYP MAX 1.250 1.250 0.005 0.02 5 0.1 1.262 1.270 0.01 0.04 15 0.3 30 0.6 0.01 10mA ≤ IOUT ≤ 5A, (Note 3) VOUT ≤ 5V VOUT ≥ 5V VOUT ≤ 5V VOUT ≥ 5V q q 20 0.3 0.002 Thermal Regulation Ripple Rejection 20ms Pulse 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 (VIN – VOUT) = 30V, TJ = 25°C q q q q q q q 60 60 75 45 0.2 3.5 100 5 5 IADJ ∆IADJ Adjust Pin Current Adjust Pin Current Change Minimum Load Current ISC Current Limit 5 6 8 12 1 2 2 UU U U U W W W U W (Note 1) Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER LM338P MIN 1.19 LM138 TYP 1.24 0.005 0.02 5 0.1 20 0.3 0.002 60 75 45 0.2 3.5 MAX 1.29 0.01 0.04 15 0.3 30 0.6 0.01 UNITS V V %/V %/V mV % mV % %/W dB dB 60 100 5 5 µA µA mA A A A 5 6 8 12 1 LT138A/LT338A LM138/LM338 ELECTRICAL CHARACTERISTICS...

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