LM337

www.fairchildsemi.com LM337 3-Terminal 1.5A Negative Adjustable Regulator Features • • • • • • • Output Current in Excess of 1.5A Output Voltage Adjustable Between -1.2V and -37V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe Area Compensation Floating Operation for High Voltage Applications Standard 3-Pin TO-220 Package Description The LM337 is a 3-terminal negative adjustable regulator. It supplies in excess of 1.5A over an output voltage range of -1.2V to -37V. This regulator requires only two external resistor to set the output voltage. Included on the chip are current limiting, thermal overload protection and safe area compensation. TO-220 1 1. Adj 2. Input 3. Output Internal Block Diagram Vadj 1 3 Output Voltage Reference + Protection Circuitry 2 Input Rev. 1.0.3 ©2010 Fairchild Semiconductor Corporation LM337 Absolute Maximum Ratings Parameter Input-Output Voltage Differential Power Dissipation Operating Temperature Range Storage Temperature Range Symbol |VI - VO| PD TOPR TSTG Value 40 Internally limited 0 ~ +125 -65 ~ +125 Unit V W °C °C Electrical Characteristics (VI - VO = 5V, IO = 40mA, 0°C ≤ TJ ≤ +125°C, PDMAX = 20W, unless otherwise specified) Parameter Line Regulation (Note1) Symbol Rline Conditions TA = +25°C 3V ≤ I VI - VO I ≤ 40V 3V ≤ I VI - VO I ≤ 40V Load Regulation (Note1) Adjustable Pin Current Adjustable Pin Current Change Rload IADJ ΔIADJ TA = +25°C 10mA ≤ IO ≤ 0.5A 10mA ≤ IO ≤ 1.5A TA = +25°C 10mA ≤ IO ≤ 1.5A 3V ≤I VI - VO I ≤ 40V TA = +25°C Reference Voltage Temperature Stability Minimum Load Current to Maintain Regulation RMS Noise, % of VOUT Ripple Rejection Ratio Long Term Stability Thermal Resistance Junction to Case Note: Min. - Typ. 0.01 0.02 15 15 50 2 Max. 0.04 0.07 50 150 100 5 Unit %/ V mV μA μA -1.213 -1.250 -1.287 -1.200 -1.250 -1.300 66 0.6 2.5 1.5 0.003 60 77 0.3 4 10 6 1 V % mA % dB % °C/W VREF STT IL(MIN) eN RR ST RθJC 3V ≤ I VI - VO I ≤ 40V 10mA ≤ IO ≤ 1.5A 0°C ≤ ΤJ ≤ +125°C 3V ≤I VI - VO I ≤ 40V 3V ≤I VI - VO I ≤ 10V TA = +25°C 10Hz ≤ f ≤10kHz VO = -10V, f = 120Hz CADJ = 10μF (Note2) TJ = 125°C ,1000Hours - 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 2. CADJ, when used, is connected between the adjustment pin and ground. 2 LM337 Typical Application IPROG R2 Ci 0. 1μF + Iadj Vadj + R1 Vo Co 1μF -VI VI KA337 LM337 -Vo Figure 1. Programmable Regulator • Ci is required if regulator is located more then 4 inches from power supply filter. A 1.0μF solid tantalum or 10μF aluminum electrolytic is recommended. Co is necessary for stability. A 1.0μF solid tantalum or 10μF aluminum electrolytic is recommended. • VO= -1.25V (1+R2/R1) 3 LM337 Mechanical Dimensions Package Dimensions in millimeters TO-220 [SINGLE GAUGE] 4 LM337 Ordering Information Product Number LM337T Package TO-220 Operating Temperature 0°C to +125°C 5 LM337 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 8/23/10 0.0m 001 Stock#DS400296 © 2010 Fairchild Semiconductor Corporation 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.