Features: Guaranteed 1% initial accuracy (A version)
3 amp output current
Internal current and thermal limiting
0.01 typical output impedance
7.5V minimum input voltage
30W power dissipation
P+ Product Enhancement tested
Specifications
| Output Current |
3000 mA |
| Output Voltage |
5 Volt |
| Input Min Voltage |
7.5 Volt |
| Input Max Voltage |
20 Volt |
| Adjustable Output |
No |
| On/Off Pin |
No |
| Error Flag |
No |
| Temperature Min |
-55 deg C |
| Temperature Max |
150 deg C |
| RegType |
Linear Regulator |
| View Using Catalog |
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
(Note 5)
Input Voltage 20V
Power Dissipation Internally Limited
Operating Junction Temperature Range
LM123 −55to +150
LM323A −40to +125
LM323 0 to +125
Storage Temperature Range −65 to +150
Lead Temperature (Soldering, 10 sec.) 300
ESD Tolerance (Note 5) 2000V
DescriptionThe 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 junction temperature range -55°C to +150°C for LM123, -40°C to +125°C for LM323A, and 0°C to +125°C for LM323. A hermetic TO-3 package is used for high reliability and low thermal resistance.
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If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
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 F solid tantalum capacitor should be used on the input. A 0.1 F 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 junction temperature range −55to +150 for LM123, −40 to +125for LM323A, and 0to +125for LM323. A hermetic TO-3 package is used for high reliability and low thermal resistance.
LM123 Data Sheet
