The LM137 are adjustable 3-terminal negative voltage regulators capable of supplying in excess of −1.5A over an output voltage range of −37V to −1.2V. These regulators are exceptionally easy to apply, requiring only 2 external resistors to set the output voltage and 1 output capacitor for frequency compensation. 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 compensation, making them virtually blowout-proof against overloads.
The LM137 serves a wide variety of applications including local on-card regulation, programmable-output voltage regulation or precision current regulation. The LM137 are ideal complements to the LM117 adjustable positive regulators.
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| Output options | Adjustable Output, Negative Output |
| Iout (max) (A) | 1.5 |
| Vin (max) (V) | -4.2 |
| Vin (min) (V) | -40 |
| Vout (max) (V) | -1.2 |
| Vout (min) (V) | -37 |
| Fixed output options (V) | 0 |
| Noise (µVrms) | 1110 |
| Iq (typ) (mA) | 0.065 |
| Thermal resistance θJA (°C/W) | 137 |
| Rating | Space |
| Load capacitance (min) (µF) | 1 |
| Regulated outputs (#) | 1 |
| Accuracy (%) | 4 |
| PSRR at 100 KHz (dB) | 30 |
| Dropout voltage (Vdo) (typ) (mV) | 3000 |
| Operating temperature range (°C) | -55 to 150 |
| Radiation, SEL (MeV·cm2/mg) | Bipolar |
| TO-CAN (K) | 2 | 989.0252 mm² 38.938 x 25.4 |
| TO-CAN (NDT) | 3 | 91.6742 mm² 10.03 x 9.14 |
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