LSP5523-R8A from Diodes Incorporated, in a SOP-8-EP. 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	BS	passive	Bootstrap. Positive rail for the high-side switch's gate driver. Connect a 0.01µF capacitor between BS and SW.
2	VIN	power_in	Input supply, 4.5V to 27V (abs max 30V). Bypass to GND with a low-ESR capacitor placed close to the pin.
3	SW	power_out	Switch output. Connect to the switching end of the inductor. Abs max -0.3V to Vin+0.3V.
4	GND	power_in	Ground return. Also tie to the exposed pad on the backside.
5	FB	input	Feedback input. Regulated to 0.925V (typ). Connect to a resistor divider between Vout and GND to set the output voltage. Abs max -0.3V to 5V.
6	COMP	passive	Error amplifier compensation node. Connect an RC network to GND for loop stability (see Stability Compensation in the Application Information). Abs max -0.3V to 5V.
7	EN	input	Enable input. IC turns on when EN > ~2.7V and turns off when EN < ~1.1V; output is discharged when off. Do not float - recommend a 200kΩ pull-up to VIN. Abs max -0.3V to 8V.
8	SS	passive	Soft-start control input. A capacitor from SS to GND sets the soft-start period (0.1µF ≈ 13ms). Leave unconnected to disable soft-start. Charge current ~6µA.
9	EP	power_in	Exposed thermal pad on the backside. Must be connected to the GND pin/plane for thermal dissipation.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOP-8-EP
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

LSP5523-R8A

CAD (KiCad official)

Symbol: LSP5523-R8A
Footprint: Package_SO:Diodes_SO-8EP
3D model: SOP-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lsp5523-r8a.step`	194 KB	You want the bare part, or you mark your own boards.
`lsp5523-r8a-etched.step`	2.2 MB	You want the part with `LSP5523-R8A` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 529 faces against 63 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: Diodes Incorporated datasheet (17 pp, sha256 e680424967a0ff3b, 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