LM104/LM204/LM304 Negative Regulator
General Description
The LM104 series are precision voltage regulators which can be programmed by a single external resistor to supply any voltage from 40V down to zero while operating from a single unregulated supply. They can also provide 0.01-percent regulation in circuits using a separate, floating bias supply, where the output voltage is limited only by the breakdown of external pass transistors. Although designed primarily as linear, series regulators, the circuits can be used as switching regulators, current regulators or in a number of other control applications. Typical performance characteristics are:
--Subsurface zener reference
--1 mV regulation no load to full load
--0.01%/V line regulation
--0.2 mV/V ripple rejection
--0.3% temperature stability over military temperature range
The LM104 series is the complement of the LM105 positive regulator, intended for systems requiring regulated negative voltages which have a common ground with the unregulated supply. By themselves, they can deliver output currents to 25 mA, but external transistors can be added to get any desired current. The output voltage is set by external resistors, and either constant or foldback current limiting is made available.
The LM104 is specified for operation over the -55°C to +125°C military temperature range. The LM204 is specified for operation over the -25°C to +85°C temperature range. The LM304 is specified for operation from 0°C to +70°C.
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