LT338A

LT138A LINER | Alldatasheet

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n Guaranteed 1% Initial Tolerance n Guaranteed 0.3% Load Regulation n Guaranteed 5A Output Current n 100% Thermal Limit Burn-In n 12A Transient Output Current 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 excel- lent 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 tech- niques to provide superior performance and reliability. The graph below shows the significant improvement in output voltage tolerance achieved by using the LT138A or LT338A. n High Power Linear Regulator n Battery Chargers n Power Driver n Constant-Current Regulator , LTC and LT are registered trademarks of Linear Technology Corporation. Parallel Regulators for Higher Current* LT338A 0.01Ω VINVIN THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1% V OUT ADJ LT350A VIN 138/338 TA01 121Ω VOUT ADJ 0.016Ω 365Ω Output Voltage Error OUTPUT VOLTAGE (V) OUTPUT VOLTAGE ERROR (%) 10 100 138A/338A TA02 2% RESISTORS 2% RESISTORS 1% RESISTORS 1% RESISTORS LM338 LM338 LT338A LT338A DESCRIPTIO UFEATURES APPLICATIO SU TYPICAL APPLICATIO U

A UGWA WU WARBSOLUTEX I T I S Operating Junction Temperature Range PRECONDITIONI GU U U 100% Thermal Limit Burn-In (Note 1) LT138A LM138 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VREF Reference Voltage I OUT = 10mA, TJ = 25°C 1.238 1.250 1.262 V 10mA £ IOUT £ 5A, P £ 50W DVOUT Line Regulation 3V £ (VIN – VOUT) £ 35V, (Note 3) 0.005 0.01 0.005 0.01 %/V DVIN l 0.02 0.04 0.02 0.04 %/V DVOUT Load Regulation 10mA £ IOUT £ 5A, (Note 3) DIOUT VOUT £ 5V 5 15 5 15 mV VOUT ‡ 5V 0.1 0.3 0.1 0.3 % VOUT £ 5V l 20 30 20 30 mV VOUT ‡ 5V l 0.3 0.6 0.3 0.6 % Thermal Regulation 20ms Pulse 0.002 0.01 0.002 0.01 %/W Ripple Rejection V OUT = 10V, f = 120Hz CADJ = 0mF l 60 60 dB CADJ = 10mF l 60 75 60 75 dB IADJ Adjust Pin Current l 45 100 45 100 mA DIADJ Adjust Pin Current Change 10mA £ IOUT £ 5A, l 0.2 5 0.2 5 mA 3V £ (VIN – VOUT) £ 35V Minimum Load Current (V IN – VOUT) = 35V l 3.5 5 3.5 5 mA ISC Current Limit (V IN – VOUT) £ 10V DC l 58 58 A 0.5ms Peak l 61 2 61 2 A (VIN – VOUT) = 30V, TJ = 25°C1 2 1 A ELECTRICAL CHARACTERISTICSThe l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) WU UPACKAGE/ORDER I FOR ATIO ORDER PART NUMBER LT138AK LT338AK LM138K LM338K TJMAX = 150°C, qJA = 35°C/ W, qJC = 1°C/ W (LT138A/LT138) TJMAX = 125°C, qJA = 35°C/ W, qJC = 1°C/ W (LT338A/LT338) Consult factory for Industrial grade parts. ORDER PART NUMBER LM338PVOUT VIN ADJ FRONT VIEW P PACKAGE 3-LEAD PLASTIC TO-3P TJMAX = 125°C, qJA = 45°C/ W VIN CASE IS OUTPUT ADJ K PACKAGE 2-LEAD TO-3 METAL CAN BOTTOM VIEW

ELECTRICAL CHARACTERISTICSThe l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) LT138A LM138 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS DVOUT Temperature Stability l 12 1 % DTemp DVOUT Long-Term Stability T A = 125°C, 1000 Hours 0.3 1 0.3 1 % DTime en RMS Output Noise (% of VOUT) 10Hz £ f £ 10kHz 0.001 0.003 % qJC Thermal Resistance K Package 1 1 °C/W Junction-to-Case The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) LT338A LM338 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VREF Reference Voltage I OUT = 10mA 1.238 1.250 1.262 V 10mA £ IOUT £ 5A, P £ 50W DVOUT Line Regulation 3V £ (VIN – VOUT) £ 35V, (Note 3) 0.005 0.01 0.005 0.03 %/V DVIN l 0.02 0.04 0.02 0.06 %/V DVOUT Load Regulation 10mA £ IOUT £ 5A, (Note 3) DIOUT VOUT £ 5V 5 15 5 25 mV VOUT ‡ 5V 0.1 0.3 0.1 0.5 % VOUT £ 5V l 20 30 20 50 mV VOUT ‡ 5V l 0.3 0.6 0.3 1 % Thermal Regulation 20ms Pulse 0.002 0.02 0.002 0.02 %/W Ripple Rejection V OUT = 10V, f = 120Hz CADJ = 0mF l 60 60 dB CADJ = 10mF l 60 75 60 75 dB IADJ Adjust Pin Current l 45 100 45 100 mA DIADJ Adjust Pin Current Change 10mA £ IOUT £ 5A, l 0.2 5 0.2 5 mA 3V £ (VIN – VOUT) £ 35V Minimum Load Current (V IN – VOUT) = 35V l 3.5 10 3.5 10 mA ISC Current Limit (V IN – VOUT) £ 10V DC l 58 58 A 0.5ms Peak l 61 2 61 2 A (VIN – VOUT) = 30V, TJ = 25°C1 2 1 A DVOUT Temperature Stability l 12 1 % DTemp DVOUT Long-Term Stability T A = 125°C, 1000 Hours 0.3 1 0.3 1 % DTime en RMS Output Noise (% of VOUT) 10Hz £ f £ 10kHz 0.001 0.003 % qJC Thermal Resistance K Package 1 1 °C/W Junction-to-Case Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: Unless otherwise specified, these specifications apply: VIN – VOUT = 5V and IOUT = 2.5A. These specifications are applicable for power dissipations up to 50W. Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.

TYPICAL PERFOR A CE CHARACTERISTICS UW TEMPERATURE (°C) –75 –0.4 OUTPUT VOLTAGE DEVIATION (%)–0.3 –0.1 0.1 –25 25 50 150 138/338 G01 –0.2 –50 0 75 100 125 0.2 IOUT = 5A IOUT = 3A VIN = 15V VOUT = 10V PRELOAD = 50mA Load RegulationLoad Regulation TEMPERATURE (°C) –50 1.230 REFERENCE VOLTAGE (V)1.240 1.250 1.260 1.270 –25 0 25 50 138A/338A G04 75 100 125 150 Temperature Stability INPUT-OUTPUT DIFFERENTIAL (V) QUIESCENT CURRENT (mA) 15 25 40 138A/338A G06 51 0 20 30 35 TJ = 25°C TJ = 150°C TJ = –55 °C TEMPERATURE (°C) –75 ADJUSTMENT CURRENT (µA) 138A/338A G03 –25 25 125 Adjustment Current TEMPERATURE (°C) –75 INPUT-OUTPUT DIFFERENTIAL (V) –25 25 50 150 138/338 G02 –50 0 75 100 125 IOUT = 5A IOUT = 3A IOUT = 1A ∆VOUT = 100mV Dropout Voltage FREQUENCY (Hz) OUTPUT IMPEDANCE (Ω ) 0.1 100k 138/338 G05 0.01 0.001 0.0001 100 1k 10k 1M VIN = 15V VOUT = 10V IOUT = 500mA CADJ = COUT = 10µF CADJ = COUT = 0µF Output Impedance Minimum Operating Current Ripple Rejection Ripple RejectionRipple Rejection OUTPUT VOLTAGE (V) RIPPLE REJECTION (dB) 100 10 20 25 138A/338A G07 15 30 35 CADJ = 10µF CADJ = 0µF VIN – VOUT = 5V IOUT = 500mA f = 120Hz T J = 25°C FREQUENCY (Hz) RIPPLE REJECTION (dB) 100 100k 138A/338A G08 100 1k 10k 1M CADJ = 10µF CADJ = 0µF VIN = 15V VOUT = 10V IOUT = 0.2A OUTPUT CURRENT (A) 0.1 RIPPLE REJECTION (dB)50 11 0 138/338 G09 CADJ = 10µF CADJ = 0µF VIN = 15V VOUT = 10V f = 120Hz T CASE = 25°C

16 PEAK CURRENT LIMIT

is the specified minimum load current of 5mA or 10mA. ing additional error to the output voltage tolerance. Figure 1. Basic Adjustable Regulator

sive and not conductive to volume production. set the output voltage within an acceptable tolerance. is shown on the front page of this data sheet. Table 1. 0.5% and 1% Standard Resistance Values capacitor to use is solid tantalum. from the adjustment terminal to the output (see Figure 2). tor to improve ripple rejection.

ratio. RP is about 0.004W per foot using 16 gauge wire. Figure 3. Connections for Best Load Regulation

5V Regulator with Shutdown LT338A VIN 121Ω 1%1µF 138A/338A TA05 VOUT ADJ 2N3904 VIN TTL 365Ω 1%1k LT338A VINVIN RETURN VOUT ADJ LM301A VIN 100pF 138A/338A TA06 25Ω RP (MAX DROP 300mV) 25Ω 121Ω RL 365Ω 5µF VOUT RETURN LT338A VIN 243Ω 138A/338A TA07 VOUT 2N3906 ADJ 50k 10k 12V 50Ω Temperature Compensated Lead Acid Battery Charger Remote Sensing

200Ω 300Ω VIN VOUT ADJ 120Ω 16k Q27Q26 Q22 Q25 12k 1.6k 6.7k 20k5.6k50Ω190Ω310Ω310Ω 5pF 18k Q24Q23 Q21 Q19 Q13 Q9Q6Q4 Q18 Q16 Q28 160Ω 160k 0.01Ω 138A/338A SS 400Ω 2.4k 12.4k 130Ω 30k 12k 5.1k4.1k 10Ω4.1k180Ω 160k Q14 Q20Q17 30pF 30pF Q12 Q10 Q2 Q15 Q11 LT138A/LT338A

Dimensions in inches (millimeters) unless otherwise noted. K Package 2-Lead TO-3 Metal Can (LTC DWG # 05-08-1310) K2 (TO-3) 1098 0.038 – 0.043 (0.965 – 1.09) 0.060 – 0.135 (1.524 – 3.429) 0.320 – 0.350 (8.13 – 8.89) 0.420 – 0.480 (10.67 – 12.19) 0.760 – 0.775 (19.30 – 19.69) 0.490 – 0.510 (12.45 – 12.95) R 0.167 – 0.177 (4.24 – 4.49) R 0.151 – 0.161 (3.86 – 4.09) DIA, 2PLCS 1.177 – 1.197 (29.90 – 30.40) 0.655 – 0.675 (16.64 – 17.15) 0.067 – 0.077 (1.70 – 1.96) 0.210 – 0.220 (5.33 – 5.59) 0.425 – 0.435 (10.80 – 11.05)

3-Lead Plastic TO-3P (Similar to TO-247) (LTC DWG # 05-08-1450) PACKAGE DESCRIPTIONU Dimensions in inches (millimeters) unless otherwise noted. 0.580 – 0.6OO (14.73 – 15.24) 0.170 (4.32) MAX 0.325 (8.255) 0.580 (14.732) 0.560 (15.75 – 16.26) 0.170 – 0.2OO (4.32 – 5.08) MOUNTING HOLE 0.115 – 0.145 (2.92 – 3.68) DIA 0.580 – 0.6OO (14.73 – 15.24) 0.830 – 0.870 (21.08 – 22.10) 0.780 – 0.800 (19.81 – 20.32) 0.620 – 0.64O (15.75 – 16.26) 0.215 (5.46) BSC 0.113 – 0.123 (2.87 – 3.12) 0.042 – 0.052 (1.07 – 1.32) 0.074 – 0.084 (1.88 – 2.13) 0.187 – 0.207 (4.75 – 5.26) 0.060 – 0.080 3° – 7° 0.087 – 0.102 (2.21 – 2.59) 0.020 – 0.040 (0.51 – 1.02) EJECTOR PIN MARKS 0.105 – 0.125 (2.67 – 3.18) DIA P3 0996 0.098 (2.489) 0.124 (3.149) 0.700 (17.780) 0.275 (6.985) BOTTOM VIEW OF TO-3P HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

ª LINEAR TECHNOLOGY CORPORATION 1 991 138afa LT/LT 1199 2K REV A • PRINTED IN THE USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear-tech.com PART NUMBER DESCRIPTION COMMENTS LT1084 5A Low Dropout Operates to 30V Input LT1580 7A Fast Transient Response Regulator with 0.7V Dropout For 3.3V to 2.xxV Applications LT1581 10A Fast Transient Response Regulator For 3.3V to 2.xxV Applications LT1585/LT1587 7A/4.6A/3A Low Dropout Fast Transient Response Regulator For 1.2V to 3.3V Outputs from 5V Lamp Flasher LT338A VIN 138A/338A TA08 VOUT ADJ 12k 1µF 10µF 12V 15V 12k1k OFF 12k 10µF 10µF+ 2N3904 Automatic Light Control LT338A VIN 138A/338A TA09 VOUT ADJ 1.2k Protected High Current Lamp Driver LT338A VOUT 12V 138A/338A TA10 VIN TTL OR CMOS ADJ 15V 10k TYPICAL APPLICATIONSU