BL8028CB5TR from BL Shanghai Belling, 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	EN	input	Enable input for the IC. Drive high (VIH >= 1.2V) to enable the converter; drive low (VIL <= 0.5V) to place the part in shutdown (IQ < 1uA). EN leakage current is typically <1uA.
2	GND	power_in	Device ground. Return path for internal control circuitry and the low-side NMOS synchronous rectifier. Must be tied to the system ground plane with a low-impedance connection.
3	SW	output	Switching node. Connect an external inductor (typ. 1uH to 2.2uH) between SW and the regulator output. Internally tied to the drain of the high-side PMOS and low-side NMOS power switches; peak current limit ~2.3A.
4	VIN	power_in	Supply input voltage, 2.6V to 5.5V (absolute max 8V; OVP threshold 6.1V typ). Decouple with a low-ESR ceramic capacitor (e.g. 10uF) placed as close to the pin as possible.
5	FB	input	Feedback input to the internal error amplifier. Connect an external resistor divider from VOUT to FB and FB to GND to program the output voltage between 0.6V and VIN. Internal reference is 0.6V (typ); FB leakage <1uA.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

BL8028CB5TR
BL8028CB5TRCB5BTR
BL8028CB5TRCKCTR

CAD (KiCad official)

Symbol: BL8028CB5TR
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
`bl8028cb5tr.step`	85 KB	You want the bare part, or you mark your own boards.
`bl8028cb5tr-etched.step`	2.5 MB	You want the part with `BL8028CB5TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 586 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: BL Shanghai Belling datasheet (7 pp, sha256 42b7f3890d1ac673, 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