LM317A

UNISONIC TECHNOLOGIES CO., LTD LM317A MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR DESCRIPTION The UTC LM317A is an adjustable 3-terminal positive voltage regulator, designed to supply 1.5A of output current with voltage adjustable from 1.2V ~ 37V. LINEAR INTEGRATED CIRCUIT FEATURES * Output voltage adjustable from 1.2V ~ 37V * Output current in excess of 1.5A * Internal thermal overload protection * Internal short circuit current limiting * Output transistor safe area compensation ORDERING INFORMATION Ordering Number Lead Free Halogen Free LM317AL-AA3-R LM317AG-AA3-R LM317AL-TA3-T LM317AG-TA3-T LM317AL-TN3-R LM317AG-TN3-R LM317AL-TQ2-R LM317AG-TQ2-R LM317AL-TQ2-T LM317AG-TQ2-T Note: Pin Assignment: I: VIN O: VOUT Package SOT-223 TO-220 TO-252 TO-263 TO-263 1 ADJ ADJ ADJ ADJ ADJ Pin Assignment 2 O O O O O 3 I I I I I Packing Tape Reel Tube Tape Reel Tape Reel Tube www.unisonic.com.tw 1 of 5 QW-R101-026.C Copyright © 2009 Unisonic Technologies Co., Ltd LM317A BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R101-026.C LM317A ABSOLUTE MAXIMUM RATINGS LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL RATINGS UNIT Input-Output Voltage Differential VIN-VOUT 40 V Power Dissipation PD Internally limited Junction Temperature TJ +125 °C Operating Temperature TOPR 0 ~ +125 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER Junction to Ambient SOT-223 TO-220 TO-252 TO-263 SOT-223 TO-220 TO-252 TO-263 SYMBOL θJA RATINGS 140 50 103 62.5 23.5 3 12 3 UNIT °C/W °C/W °C/W °C/W °C/W °C/W °C/W °C/W Junction to Case θJC ELECTRICAL CHARACTERISTICS (VIN-VOUT=5V, IOUT=0.5A, PMAX=20W, Ta=25°C, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS Line Regulation ΔVOUT/VOUT 3V≤VIN-VOUT≤40V, IOUT=100mA VOUT≤5V Load Regulation ΔVOUT 10mA≤IOUT≤1.5A VOUT≥5V Adjustable Pin Current IADJ 3V≤VIN-VOUT≤40V, Adjustable Pin Current Change ΔIADJ 10mA≤IOUT≤500mA 3V≤VIN-VOUT≤40V, Reference Voltage VREF 10mA≤IOUT≤1.5A, PD＜PMAX Temperature Stability Minimum Load Current for Regulation Maximum Output Current RMS Noise vs. %of VOUT Ripple Rejection IL(MIN) IO(MAX) eN RR TMIN≤TJ≤TMAX VIN-VOUT=40V VIN-VOUT=40V, PD≤PMAX VIN-VOUT=15V, PD＜PMAX 10HZ≤f≤10KHZ VOUT=10V,f=120HZ CADJ=0 CADJ=10μF 66 MIN TYP 0.01 5 0.1 50 0.2 1.20 1.25 0.7 4.5 0.3 1.5 0.4 2.2 0.003 65 80 MAX 0.04 25 0.5 100 5 1.30 UNIT %/V mV % μA μA V %/VOUT mA A A %/VOUT dB dB UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R101-026.C LM317A APPLICATION CIRCUITS VIN 3 LINEAR INTEGRATED CIRCUIT UTC LM317A IADJ 1 2 VOUT D1 1N4002 R1 Co 1μF C1 0.1μF VIN 3 UTC LM317A 1 2 120Ω 1kΩ VOUT 1μF R2 720Ω VOUT=1.25V×(1+R2/R1)+IADJ×R2 C1 is required when regulator is located an appreciated distance from power supply. Co is needed to improve transient response. Fig.1 Programmable voltage regulator TTL Level signal Fig.2 Regulator with On-off control VREF 1.25 V ) + IADJ = R1 R1 1.25 V VREF ) + IADJ = IO(MIN) = ( R1+ R2 R1+ R2 5mA < IOUT < 100mA IO(MAX ) = ( Fig.3 Soft Start Application Fig.4 Constant Current Application UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R101-026.C LM317A TYPICAL CHARACTERISTICS LINEAR INTEGRATED CIRCUIT Output Voltage Deviation, ∆VOUT (%) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Min Output Current, IOUT (mA) Output Current, IOUT (A) Adjustment Current, IADJ (μA) 5 of 5 QW-R101-026.C