TPSY8120B1ABC from TECH PUBLIC, in a SOT-23-6. 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	Boot-strap pin. Supplies the high-side gate driver. Connect a 100 nF ceramic capacitor between BS and LX to develop the gate-drive voltage for the internal high-side MOSFET.
2	GND	power_in	Ground return for the device. Maximize copper area on this pin for thermal and noise performance; connect to the ground plane.
3	FB	input	Output feedback pin. Connect to the center tap of the output resistor divider (R1/R2) to program Vout = 0.6 V × (1 + R1/R2). Feedback reference is 0.6 V (±2%).
4	EN	input	Enable control. Pull high (>2 V) to turn the regulator on; pull low (<0.5 V) to shut it down. Do not float. Typical EN input sink current 1 µA.
5	IN	power_in	Input supply pin, 4.5 V to 16 V (18 V absolute max). Decouple with at least a 1 µF (recommended 4.7 µF) low-ESR ceramic capacitor to GND, placed close to the IN and GND pins.
6	LX	power_out	Switching node. Connect to the external output inductor. Internally tied to the drain of the high-side MOSFET and source of the low-side MOSFET; also the low reference for the BS bootstrap capacitor.

Key specifications

Parameter	Value
Manufacturer	TECH PUBLIC
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

TPSY8120B1ABC

CAD (KiCad official)

Symbol: TPSY8120B1ABC
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

Provenance

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

Datasheet: TECH PUBLIC datasheet (7 pp, sha256 1949de73e9fcd222, 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