Features
| • | Preset output voltage error less than ±3% |
| • | Preset current limit |
| • | Internal thermal shutdown |
| • | Operates with input-output voltage differential down to 1V |
| • | Excellent ripple rejection |
| • | Low temperature drift |
| • | Easily adjustable to higher output voltage |
Description The LM120 series are three-terminal negative regulators with a fixed output voltage of −5V, −12V, and −15V, and up to 1.5A
load current capability. Where other voltages are required, the LM137 and LM137HV series provide an output voltage range of
−1.2V to −47V.
The LM120 need only one external component—a compensation capacitor at the output, making them easy to apply. Worst case guarantees
on output voltage deviation due to any combination of line, load or temperature variation assure satisfactory system operation.
Exceptional effort has been made to make the LM120 Series immune to overload conditions. The regulators have current limiting
which is independent of temperature, combined with thermal overload protection. Internal current limiting protects against
momentary faults while thermal shutdown prevents junction temperatures from exceeding safe limits during prolonged overloads.
Although primarily intended for fixed output voltage applications, the LM120 Series may be programmed for higher output voltages
with a simple resistive divider. The low quiescent drain current of the devices allows this technique to be used with good
regulation.
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