LM137 Datasheet | National Semiconductor

Description The LM137/LM337 are adjustable 3-terminal negative voltage regulators capable of supplying in excess of - 1.5A over an output voltage range of - 1.2V to - 37V. These regulators are exceptionally easy to apply, requiring only 2 external resistors to set the output voltage and 1 output capacitor for frequency pensation. The circuit design has been optimized for excellent regulation and low thermal transients. Further, the LM137 series features internal current limiting, thermal shutdown and safe-area pensation, making them virtually blowout-proof against overloads. The LM137/LM337 serve a wide variety of applications including local on-card regulation, programmable-output voltage regulation or precision current regulation. The LM137/ LM337 are ideal plements to the LM117/LM317 adjustable positive regulators. n n n n n n n n 77 d B ripple rejection Excellent rejection of thermal transients 50 ppm/˚C temperature coefficient Temperature-independent current limit Internal thermal overload protection P+ Product Enhancement tested Standard 3-lead transistor package Output is short circuit protected LM137 Series Packages and Power Capability Rated Device LM137/337 LM337 LM337 Package TO-3 (K) TO-39 (H) TO-220 (T) SOT-223 (MP) Power Dissipation 20W 2W 15W 2W Design Load Current 1.5A 0.5A 1.5A 1A Features n n n n n Output voltage adjustable from - 1.2V to - 37V 1.5A output current guaranteed, - 55˚C to +150˚C Line regulation typically 0.01%/V Load regulation typically 0.3% Excellent thermal regulation, 0.002%/W Typical Applications Adjustable Negative Voltage Regulator parison between SOT-223 and D-Pak (TO-252) Packages DS009067-31 Scale 1:1 DS009067-1 Full output current not available at high input-output voltages †C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for stability - C2 = 1 µF solid tantalum is required only if regulator is more than 4" from power-supply filter capacitor Output capacitors in the range of 1 µF to 1000 µF of aluminum or...