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LM123K
THREE-TERMINAL 3A-5V POSITIVE VOLTAGE REGULATORS
1/10February 2003 OUTPUT CURRENT: 3A INTERNAL CURRENT AND THERMAL
LIMITING TYPICAL OUTPUT IMPEDANCE: 0.01Ω MINIMUM INPUT VOLTAGE: 7.5V POWER DISSIPATION: 30W
DESCRIPTIONThe LM123, LM223, LM323 are three-terminal
positive voltage regulators witha preset 5V output
anda load driving capabilityof 3A. New circuit
design and processing techniques are usedto
provide the high output current without sacrificing
the regulation characteristics of lower current
devices.
The 3A regulatoris virtually blowout proof.
Current limiting, power limiting and thermal
shut-down provide the same high levelof reliability
obtained with these techniquesin the LM209, 1A
regulator. An overall worst case specification for
the combined effects of input voltage, load
current, ambient temperature, and power
dissipation ensure that the LM123, LM223, LM323
will perform satisfactorilyasa system element.
LM123/LM223
LM323THREE-TERMINAL 3A-5V
POSITIVE VOLTAGE REGULATORS
SCHEMATIC DIAGRAM
LM123-LM223-LM3232/10
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
THERMAL DATA
CONNECTION DIAGRAM (top view)
ORDERING CODES
LM123-LM223-LM3233/10
ELECTRICAL CHARACTERISTICS OF LM123/LM223(TJ= -55to 150°Cfor LM123,= -25to 150°C for LM223 unless otherwise specified).
Notes:1. Although power dissipationis internally limited, specifications apply onlyforP≤ 30W. Selected devices with tightened tolerance output voltage available. Loadandline regulationare specifiedat constant junction temperature. Pulse testingis required witha pulse width≤ 1msand
duty cycle≤ 5%.
ELECTRICAL CHARACTERISTICS OF LM323 (TJ=0to 150°C, unless otherwise specified).
Notes:1. Although power dissipationis internally limited, specifications apply onlyforP≤ 30W. Selected devices with tightened tolerance output voltage available. Loadandline regulationare specifiedat constant junction temperature. Pulse testingis required witha pulse width≤ 1msand
duty cycle≤ 5%.
LM123-LM223-LM3234/10
Figure1: Output Noise Voltage
Figure2: Output Impedance
Figure3: Peak Available Output Current
Figure4: Short Circuit Current
Figure5: Ripple Rejection
Figure6: Dropout Voltage
LM123-LM223-LM3235/10
Figure7: Line Transient Response
Figure8: Output Voltage
Figure9: Quiescent Current
Figure10: Load Transient Response
TYPICAL APPLICATION
BASIC 3A REGULATOR= Requiredif regulatoris distant from filter capacitors.= Regulatoris stable withno load capacitorinto resistive loads.
