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LM2576SX-3.3

Public Unreviewed

by Ray

TECH PUBLIC LM2576SX 3 3 DC-DC Converters, TO-263-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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LM2576SX-3.3

TECH PUBLIC · DC-DC Converters · TO-263-5

LM2576SX-3.3 from TECH PUBLIC, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Vin power_in Unregulated DC input supply. Recommended operating range 4.75V to 40V (absolute max 45V). Bypass locally with a low-ESR bulk capacitor (typ. 100µF) to ground.
2 Output output Switching output (SW) from the internal 3A NPN power switch. Connects to the catch diode cathode and the output inductor of the buck converter. Absolute max -1V to +25V relative to ground.
3 GND power_in Device ground reference for control circuitry and return for the internal power switch. Tie directly to the ground plane.
4 Feedback input Output voltage sense input for the internal error amplifier. On the fixed 3.3V version, connect directly to the regulated output node; the internal divider sets Vout = 3.3V (±4%). Feedback bias current is typically 50nA.
5 Enable input ON/OFF shutdown control input. Logic LOW (<1.0V) or tied to GND enables the regulator; logic HIGH (>2.2V, up to 25V absolute max) forces the regulator into low-power standby (typ. 70µA). Input current typ. 12µA at 5V.

Key specifications

Parameter Value
Manufacturer TECH PUBLIC
Package TO-263-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LM2576SX-3.3

The extractor listed these alongside LM2576SX-3.3, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM2576SX-3.3SX-5.0
  • LM2576SX-3.3SX-ADJ

CAD (KiCad official)

  • Symbol: LM2576SX-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
  • 3D model: TO-263-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm2576sx-3-3.step 180 KB You want the bare part, or you mark your own boards.
lm2576sx-3-3-etched.step 2.2 MB You want the part with LM2576SX-3.3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 572 faces against 135 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: TECH PUBLIC datasheet (6 pp, sha256 0072318ac087ed5c, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF