BL8034CS8TR from BL Shanghai Belling, in a ESOP-8. 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	High-side power transistor gate-drive bootstrap input. Connect a 1uF ceramic capacitor between BST and SW to generate the boosted gate-drive rail for the internal high-side MOSFET. Absolute maximum: -0.3V to SW+6V.
2	VIN	power_in	Main power input, 4.2V to 16V operating range (17V absolute max). Bypass with a 10uF to 22uF ceramic capacitor to GND placed close to the pin.
3	SW	power_out	Switching node connecting the internal high-side and low-side MOSFETs to the external inductor. Absolute max -0.3V to VIN+0.3V; internally current-limited to ~6A peak (cycle-by-cycle).
4	GND	power_in	Device ground return. Tie the exposed pad to this pin on the PCB and to a large GND copper area for thermal performance.
5	FB	input	Feedback input to the internal error amplifier. Regulates to an internal reference of 0.923V (typical, 0.904V-0.942V). Set output voltage with a resistor divider from VOUT to FB to GND. Absolute max -0.3V to 6V.
6	NC	unconnected	No internal connection. May be left floating or tied to GND.
7	EN	input	Enable input. Drive high (>=1.5V) to enable the converter; drive low (<=0.6V) to place the device in shutdown (~5uA typical). Absolute max -0.3V to VIN+0.3V. Do not leave floating; a 100k pull-up to VIN is typical.
8	NC	unconnected	No internal connection. May be left floating or tied to GND.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	ESOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

BL8034CS8TR

CAD (KiCad official)

Symbol: BL8034CS8TR
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: BL Shanghai Belling datasheet (5 pp, sha256 58a69f29e7369773, 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