LM2574MX-ADJ National Semiconductor, LM2574MX-ADJ Datasheet - Page 22

• Manufacturer Part Number: LM2574MX-ADJ
• Manufacturer: National Semiconductor

Specifications of LM2574MX-ADJ

• Dc To Dc Converter Type: Inverting/Step Down
• Number Of Outputs: 1
• Pin Count: 14
• Input Voltage: 40V
• Output Voltage: 1.23 to 37V
• Switching Freq: 47 TO 58KHz
• Output Current: 500mA
• Efficiency: 77%
• Package Type: SOIC W
• Output Type: Adjustable
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 4V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Lead Free Status / Rohs Status: Not Compliant

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Definition of Terms
INDUCTOR SATURATION
The condition which exists when an inductor cannot hold any
more magnetic flux. When an inductor saturates, the induc-
tor appears less inductive and the resistive component domi-
nates. Inductor current is then limited only by the DC resis-
tance of the wire and the available source current.
(Continued)
22
OPERATING VOLT MICROSECOND CONSTANT (E • T
The product (in VoIt • µs) of the voltage applied to the inductor
and the time the voltage is applied. This E • T
measure of the energy handling capability of an inductor and
is dependent upon the type of core, the core area, the num-
ber of turns, and the duty cycle.
op
constant is a
op
)