Explore LM2576 pins, signal names, electrical functions and connection guidance for each package.
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Click a lead or use the arrow keys. Front view · leads down · pin 3 and tab are GND
Supplies the internal power switch, control circuit and bias current.
Connect the positive DC supply and a short, local input bypass to ground.
The 5 V version is specified with 8–40 V input under its stated load conditions; 45 V is an absolute maximum, not an operating target.
Pulsed output of the internal high-side switch. This node drives the external inductor.
Connect to the inductor input and Schottky cathode. The diode anode returns to GND.
This is not the filtered 5 V rail. Keep switch-node copper compact and away from feedback wiring.
Common return for the controller and power stage. The exposed metal tab is also ground.
Connect to the input-capacitor return, catch-diode anode and output-capacitor return with short power paths.
On the SMD footprint, pin 3 and the thermal-pad sections have the same electrical pad number.
Senses the filtered output and closes the regulation loop. The fixed 5 V device includes its feedback divider internally.
For the fixed 5 V example, connect directly to the output after the inductor, near COUT.
The adjustable variant instead needs an external divider referenced to approximately 1.23 V. Do not mix the two circuits.
Low enables switching; high shuts the regulator down.
Connect to ground for an always-on converter.
Logic ON is guaranteed at 0.8 V or below and OFF at 2.4 V or above over the specified temperature range. The typical switching threshold is approximately 1.4 V.
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