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XL1509-3.3

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by Ray

UMW DC-DC Converters, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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XL1509-3.3

UMW · DC-DC Converters · SOP-8

XL1509-3.3 from UMW, in a SOP-8. 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 Supply Voltage Input Pin. Operates from 4.5V to 40V DC (absolute max 45V). Bypass VIN to GND with a suitably large capacitor to eliminate input-line noise.
2 OUTPUT output Power Switch Output Pin (SW). Switch node connecting the internal power transistor's emitter to the external inductor and Schottky catch diode; delivers up to 2A of switched current at 150 kHz.
3 FEEDBACK input Feedback Pin (FB). For fixed-output versions (3.3V here), tie directly to the regulated output; internal divider senses against the 1.23V reference. Absolute max: -0.3 to VIN.
4 ON/OFF input Enable Pin. Drive low (<0.8V) to turn the regulator ON, drive high (>1.4V) to turn it OFF. Floating defaults low (ON). Shutdown supply current typ. 80 µA.
5 GND power_in Ground pin. Should be placed outside the Schottky diode to output capacitor ground path to prevent switching-current spikes from inducing voltage noise into the IC. Pins 5, 6, 7, 8 are all GND and should be tied together.
6 GND power_in Ground pin (see pin 5). Tie all four GND pins to a solid ground plane for current return and thermal dissipation.
7 GND power_in Ground pin (see pin 5). Tie all four GND pins to a solid ground plane for current return and thermal dissipation.
8 GND power_in Ground pin (see pin 5). Tie all four GND pins to a solid ground plane for current return and thermal dissipation.

Key specifications

Parameter Value
Manufacturer UMW
Package SOP-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • XL1509-3.3
  • XL1509E-3.3

CAD (KiCad official)

  • Symbol: XL1509-3.3
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: UMW datasheet (15 pp, sha256 bd5713838034a224, 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