LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator
April 1998
LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator
Gen...
LM123/LM323A/LM323 3-Amp, 5-Volt Positive
Regulator
April 1998
LM123/LM323A/LM323 3-Amp, 5-Volt Positive
Regulator
General Description
The LM123 is a three-terminal positive
regulator with a preset 5V output and a load driving capability of 3 amps. New circuit design and processing techniques are used to provide the high output current without sacrificing the regulation characteristics of lower current devices. The LM323A offers improved precision over the standard LM323. Parameters with tightened specifications include output voltage tolerance, line regulation, and load regulation. The 3 amp
regulator is virtually blowout proof. Current limiting, power limiting, and thermal shutdown provide the same high level of reliability obtained with these techniques in the LM109 1 amp
regulator. No external components are required for operation of the LM123. If the device is more than 4 inches from the filter capacitor, however, a 1 µF solid tantalum capacitor should be used on the input. A 0.1 µF or larger capacitor may be used on the output to reduce load transient spikes created by fast switching digital logic, or to swamp out stray load capacitance. An overall worst case specification for the combined effects of input voltage, load currents, ambient temperature, and power dissipation ensure that the LM123 will perform satisfactorily as a system element. For applications requiring other voltages, see LM150 series adjustable
regulator data sheet. Operation is guaranteed over the ju...