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LM2575S-3.3

Public Made by Adom

by adom

UMW DC-DC Converters, TO-263-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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LM2575S-3.3

UMW · DC-DC Converters · TO-263-5

LM2575S-3.3 from UMW, 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 Input supply voltage. Operating range 4.75V to 40V for the LM2575 (up to 60V for the HV variant); absolute max 45V (LM2575) / 63V (LM2575HV). Requires a bulk input capacitor (e.g. 680 uF) close to this pin.
2 Output output Switching output from the internal 2A power transistor. Connects to the catch diode (e.g. 1N5824 Schottky) cathode and the output filter inductor. Saturation voltage ~1.16V at 2A; internal current limit typ. 2.2A.
3 GND power_in Device ground return. Also the thermal path for the TO-263 tab; the exposed tab is electrically connected to GND and should be soldered to a copper pour for heatsinking (theta_JA ~20-50 C/W depending on copper area).
4 Feedback input Output voltage feedback sense. On the fixed 3.3V version this pin is tied directly to the regulated output node; the internal reference regulates it to 3.3V (Vout tolerance +/-4% over line/load). Feedback bias current 10 nA typ (adjustable variant).
5 ON/OFF input Active-low shutdown input. Regulator is ON when the pin is low or left floating (VIL max 1.2V) and enters low-power standby when driven high (VIH min 1.4V, IQ_standby ~50 uA). Input range -0.3V to +VIN; TTL-compatible.

Key specifications

Parameter Value
Manufacturer UMW
Package TO-263-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LM2575S-3.3
  • LM2575HVS-3.3
  • LM2575T-3.3
  • LM2575HVT-3.3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output voltage (3.3 V fixed version) VOUT 3.135 3.3 3.465 V VIN=12V, ILOAD=2A (system parameters, Fig. 1); min/max are full-temperature (bold) limits; 25°C limits 3.168 / 3.432 5
Oscillator frequency fO 42 52 63 kHz VIN=12V, ILOAD=500mA (table header note); full-temperature limits; 25°C limits 47 / 58 6
Saturation voltage VSAT 1.16 1.5 V IOUT=2A (Notes 7, 8); full-temperature limit; 25°C max 1.4 6
ON/OFF pin logic input threshold voltage, high (regulator OFF) VIH 2.4 1.4 V Full-temperature limit; 25°C min 2.2 7
ON/OFF pin logic input threshold voltage, low (regulator ON) VIL 1.2 0.8 V Full-temperature limit; 25°C max 1.0 7
ON/OFF pin input current, high (regulator OFF) IH 12 30 µA VLOGIC=2.5V (Regulator OFF) 7
ON/OFF pin input current, low (regulator ON) IL 0 10 µA VLOGIC=0.5V (Regulator ON) 7
Junction to case thermal resistance (TO-220 or TO-263) θJC 2 °C/W TO-220 or TO-263 package, junction to case 7
Junction to ambient thermal resistance, TO-263, 0.5 in² copper θJA 50 °C/W TO-263 package tab soldered to single PCB, 0.5 in² of 1 oz copper (Note 12) 7
Junction to ambient thermal resistance, TO-263, 2.5 in² copper θJA 30 °C/W TO-263 package tab soldered to single-sided PCB, 2.5 in² of 1 oz copper (Note 13) 7
Junction to ambient thermal resistance, TO-263, 3 in² copper double-sided θJA 20 °C/W TO-263 package tab soldered to double-sided PCB, 3 in² of 1 oz copper on LM2575 side (Note 14) 7
Maximum supply voltage (LM2575, non-HV) 45 V 4
ON/OFF pin input voltage -0.3 V Printed as -0.3 ≤ V ≤ +VIN; upper limit is +VIN (not numeric) 4
Output voltage to ground (steady state) -1 V Steady state 4
ESD susceptibility, human body model 2 kV Human body model (100 pF through 1.5 kΩ) 4
Storage temperature range -65 150 °C 4
Maximum junction temperature TJ 150 °C 4
Junction temperature range (operating) TJ -40 125 °C 4
Supply voltage (LM2575, non-HV) 40 V 4

CAD (KiCad official)

  • Symbol: LM2575S-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
  • 3D model: TO-263-5 (KiCad packages3D, STEP)
  • 3D model files: lm2575s-3-3-etched.step / lm2575s-3-3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2575s-3-3.step / lm2575s-3-3.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm2575s-3-3.step 180 KB You want the bare part, or you mark your own boards.
lm2575s-3-3-etched.step 2.0 MB You want the part with LM2575S-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: 539 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: UMW datasheet (30 pp, sha256 b0c31af439f0b6b9, 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