component

LPW5209B5F-21

Public Unreviewed

by Ray

LOWPOWER AC-DC Controllers and Regulators, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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LPW5209B5F-21

LOWPOWER · AC-DC Controllers and Regulators · SOT-23-5

LPW5209B5F-21 from LOWPOWER, in a SOT-23-5. 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 VOUT power_out Switched power output pin; source of the internal high-side N-MOSFET. Delivers input voltage to the load with 80mΩ typical RDS(ON) and 2.1A current limit. Requires an output bypass capacitor to ground.
2 GND power_in Ground reference for the device.
3 NC unconnected No connect. On the fixed-current-limit LPW5209-21/11/06 variants, pin 3 is not internally connected (the ISET function is only present on the adjustable LPW5209A variant).
4 EN input Active-high device enable input. VEN ≥ 1.4V turns the switch on; VEN ≤ 0.4V disables the switch (shutdown current 0.1µA typ). Must not be left floating and must not go negative with respect to GND; may be tied to VIN to keep the switch always on.
5 VIN power_in Input supply pin, 2.5V to 6V (7V absolute max). Powers the internal circuitry and drain of the internal N-MOSFET switch. Bypass with an input capacitor close to the pin.

Key specifications

Parameter Value
Manufacturer LOWPOWER
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LPW5209B5F-21
  • LPW5209B5F-21AB5F

The extractor listed these alongside LPW5209B5F-21, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LPW5209B5F-11
  • LPW5209B5F-06

CAD (KiCad official)

  • Symbol: LPW5209B5F-21
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lpw5209b5f-21.step 85 KB You want the bare part, or you mark your own boards.
lpw5209b5f-21-etched.step 2.3 MB You want the part with LPW5209B5F-21 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 102 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: LOWPOWER datasheet (7 pp, sha256 a4d2b61137b282f3, 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