LM2940 has high conversion
efficiency than the 7805. There will be 3mA current consumption (quiescent
current)when 7805 without direct input connected to the output of the internal
situation. LDO element quiescent current is far smaller than it.The LM2940 is a
LDO (LDO means a low dropout regulator, which means higher low dropout linear
regulator, as opposed to the traditional linear regulator. The traditional
linear regulators, such as the 78xx series chips' input voltage are required to
higher than the output voltage 2v ~ 3V at least, or it will not work properly.
However, in some cases, this condition is clearly too harsh, such as 5v turn
3.3v, differential input and output is only 1.7v, apparently not
satisfied with the conditions. The LDO class power conversion chip were
invented only for this case.
LM2940-5.0 low dropout
three-terminal regulator chip
Model: LM2940-5.0P
+ Package: TO-220
Fixed output
voltage low dropout three-terminal regulator; the output voltage of 5V; Output
Current 1A; the output current is 1A, the minimum input-output voltage is less
than 0.8V; maximum input voltage of 26V; Operating Temperature -40 ~ + 125 ℃; intron quiescent current
reduction circuit, current limiting, thermal protection, and reverse battery
protection circuit-insertion.
The UTC LM2940 is a low dropout regulator designed to
provide output current up to 1A with a typically 500mV dropout
Voltage and a maximum of 1V. It is capable of reducing the ground current
when the differential between the input voltage and the output voltage.
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