AP3128AE3036ES6 from Wuxi Chipown Micro electronics, in a SOT-23-6L. 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	SW	output	Switch pin. Drain of the internal N-MOSFET; connect to the boost inductor and Schottky diode anode. Absolute maximum rating -0.3V to 40V; 1.2A typical current limit; 0.7Ω typical RDS(ON).
2	GND	power_in	Ground pin. Must connect to a large PCB ground area to ensure maximum power dissipation.
3	FB	input	Feedback voltage pin. Regulates to a 300mV (typ, 285-315mV) reference; LED current set by RSET from FB to GND (ILED = VREF / RSET).
4	EN	input	Chip enable pin (active high). VIH ≥ 1.4V enables the IC; VIL ≤ 0.5V shuts it down (ISHDN ≈ 1uA). Also accepts a PWM signal (100Hz-200kHz) for LED dimming - VFB effectively = Duty × 300mV.
5	VOUT	power_out	Output voltage sense pin. Connects to the boost converter output for OVP monitoring (VOVP ≈ 36V typ, 34-38V). Absolute max -0.3V to 40V.
6	VIN	power_in	Input supply pin. Operating range 2.5V to 5.5V (absolute max 6V). UVLO threshold ≈ 2.2V (2.0-2.45V) with 0.1V hysteresis. Bypass with a 2.2uF ceramic capacitor close to the pin.

Key specifications

Parameter	Value
Manufacturer	Wuxi Chipown Micro electronics
Package	SOT-23-6L
Category	LED-drv
Pins	6

Ordering variants

AP3128AE3036ES6
AP3128AE3036ES6AP3128AE3036IDE

CAD (KiCad official)

Symbol: AP3128AE3036ES6
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ap3128ae3036es6.step`	97 KB	You want the bare part, or you mark your own boards.
`ap3128ae3036es6-etched.step`	3.2 MB	You want the part with `AP3128AE3036ES6` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 758 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: Wuxi Chipown Micro electronics datasheet (10 pp, sha256 3b7df0e4cdd8bd25, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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