www.fairchildsemi.com LM337 3-Terminal 1.5A Negative Adjustable Regulator Features 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. 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 TO-220 1 1. Adj 2. Input 3. Output Internal Block Diagram Vadj 1 Voltage Reference 3 Output + Protection Circuitry 2 Input Rev. 1.0.3 ©2010 Fairchild Semiconductor Corporation LM337 Absolute Maximum Ratings Parameter Symbol Value Unit Input-Output Voltage Differential |VI - VO| 40 V PD Internally limited W Operating Temperature Range TOPR 0 ~ +125 °C Storage Temperature Range TSTG -65 ~ +125 °C Power Dissipation Electrical Characteristics (VI - VO = 5V, IO = 40mA, 0°C ≤ TJ ≤ +125°C, PDMAX = 20W, unless otherwise specified) Parameter Line Regulation (Note1) Load Regulation (Note1) Adjustable Pin Current Adjustable Pin Current Change Reference Voltage Temperature Stability Minimum Load Current to Maintain Regulation Symbol Rline Rload Min. Typ. Max. TA = +25°C 3V ≤ I VI - VO I ≤ 40V - 0.01 0.04 3V ≤ I VI - VO I ≤ 40V - 0.02 0.07 TA = +25°C 10mA ≤ IO ≤ 0.5A - 15 50 10mA ≤ IO ≤ 1.5A - 15 150 - 50 100 μA - 2 5 μA IADJ ΔIADJ VREF STT IL(MIN) RMS Noise, % of VOUT eN Ripple Rejection Ratio RR Long Term Stability ST Thermal Resistance Junction to Case Conditions RθJC TA = +25°C 10mA ≤ IO ≤ 1.5A 3V ≤I VI - VO I ≤ 40V TA = +25°C -1.213 -1.250 -1.287 3V ≤ I VI - VO I ≤ 40V 10mA ≤ IO ≤ 1.5A -1.200 -1.250 -1.300 Unit %/ V mV V 0°C ≤ ΤJ ≤ +125°C - 0.6 - 3V ≤I VI - VO I ≤ 40V - 2.5 10 3V ≤I VI - VO I ≤ 10V - 1.5 6 TA = +25°C 10Hz ≤ f ≤10kHz - 0.003 - VO = -10V, f = 120Hz - 60 - CADJ = 10μF (Note2) 66 77 - - 0.3 1 % - 4 - °C/W TJ = 125°C ,1000Hours - % mA % dB Note: 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 R1 Co 1μF Vadj -VI VI KA337 LM337 Vo -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 Package Operating Temperature LM337T TO-220 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. 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. www.fairchildsemi.com 8/23/10 0.0m 001 Stock#DS400296 © 2010 Fairchild Semiconductor Corporation