AP5100WG-7 from Diodes Incorporated, in a SOT-26. 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	BST	passive	Bootstrap. A capacitor (0.1µF to 1µF typical) connected between SW and BST forms a floating supply across the internal power switch driver, boosting the high-side MOSFET gate above the supply voltage.
2	GND	power_in	Ground reference for the regulated output voltage and all internal control circuits. Careful PCB layout is required to minimize noise coupling into this reference.
3	FB	input	Feedback input, nominally 0.81V. Connect to the output resistor divider (or directly to VOUT for 0.81V output) to set the regulated output voltage. Includes a frequency foldback comparator that lowers the oscillator frequency to ~480kHz when FB falls below 400mV during current limit.
4	EN	input	On/Off control input. Pull above 1.2V to enable the converter and below 0.4V to disable it. Do not leave floating; if unused, tie to VIN through a 100kΩ resistor.
5	IN	power_in	Supply voltage input, 4.75V to 24V (absolute maximum 26V). A local decoupling capacitor (C1) is required close to the pin to prevent large voltage spikes at the input.
6	SW	power_out	Switch output from the internal high-side MOSFET (RDS(on) ~0.35Ω, current limit ~2.4A). Connects to the external inductor and catch diode; also the reference return for the BST floating supply capacitor.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-26
Category	PMIC
Pins	6

Ordering variants

AP5100WG-7

CAD (KiCad official)

Symbol: AP5100WG-7
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-26 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ap5100wg-7.step`	97 KB	You want the bare part, or you mark your own boards.
`ap5100wg-7-etched.step`	1.8 MB	You want the part with `AP5100WG-7` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 449 faces against 117 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 (12 pp, sha256 cc0494aed30da802, retrieved 2026-08-17, tier: manufacturer)
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