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LM2576S-3.3

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UMW DC-DC Converters, TO-263-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM2576S-3.3

UMW · DC-DC Converters · TO-263-5

LM2576S-3.3 from UMW, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VIN power_in Input supply voltage: operating range is 4.5V to 40V for LM2576 (4.5V to 60V for LM2576HV), with absolute maximum supply voltage of 45V for LM2576 (63V for LM2576HV).
2 Output output Switching output that drives the inductor and catch diode, rated for 3A guaranteed output current, with output voltage to ground (steady state) not below -1V.
3 GND power_in Ground reference pin; single-point or ground-plane grounding is recommended for best regulation and minimal ground-loop noise.
4 Feedback input Output voltage feedback input that regulates to the internal 1.23V reference, with feedback bias current of 100/500 nA maximum.
5 ON/OFF input TTL shutdown input that is active when low or floating and turns the regulator off when driven high (VIH 2.2/2.4V min, VIL 1.0/0.8V max), with about 50 µA standby current in shutdown.
6 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer UMW
Package TO-263-5
Category Power Management (PMIC)
Pins 6

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, 3.3V version (VIN=12V, ILOAD=0.5A) VOUT 3.234 3.3 3.366 V VIN=12V, ILOAD=0.5A, Circuit of Figure 2 5
Output voltage, 3.3V version (line and load, LM2576) VOUT 3.135 3.3 3.465 V 6V≤VIN≤40V, 0.5A≤ILOAD≤3A, Circuit of Figure 2 5
Oscillator frequency fO 47 52 58 kHz Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA 8
Saturation voltage VSAT 1.4 2 V IOUT=3A (Note 4) 8
Max duty cycle (ON) DC 93 98 % Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA 8
Current limit ICL 3.5 5.8 7.5 A Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA 8
Feedback bias current IB 50 500 nA Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA 8
Standby quiescent current ISTBY 50 200 µA ON/OFF pin=5V (OFF) 8
ON/OFF pin logic input level high VIH 2.4 1.4 V VOUT=0V 9
ON/OFF pin logic input level low VIL 1.2 0.8 V VOUT=Nominal Output Voltage 9
ON/OFF pin input current high IIH 12 30 µA ON/OFF Pin=5V(OFF) 9
ON/OFF pin input current low IIL 0 10 µA ON/OFF Pin=0V(ON) 9
Minimum supply voltage (LM2576) 45 V 4
ON/OFF pin input voltage -0.3 V Printed as -0.3 ≤ V ≤ +VIN 4
Output voltage to ground (steady state) -1 V Steady state 4
Storage temperature range -65 150 °C 4
Maximum junction temperature 150 °C 4
Minimum ESD rating 2 kV C=100pF, R=1.5kΩ 4
Lead temperature (soldering) 260 °C Soldering, 10 seconds 4
Operating junction temperature range (LM2576) TJ -40 125 °C Temperature Range (LM2576/LM2576HV) 4
Supply voltage (LM2576) 4.5 40 V 4

CAD (KiCad official)

  • Symbol: LM2576S-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
  • 3D model: TO-263-5 (KiCad packages3D, STEP)
  • 3D model files: lm2576s-3-3-etched.step / lm2576s-3-3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2576s-3-3.step / lm2576s-3-3.glb are the bare package body.

Provenance

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

  • Datasheet: UMW datasheet (18 pp, sha256 10275fb18a78ad8b, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF