H7544-1 from Shanghai Siproin Microelectronics, in a SOT-23. 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	GND	power_in	Ground / common return for the regulator. Connect to system ground; single-point ground is recommended per the application circuits.
2	VIN	power_in	Unregulated input supply. Absolute max 18V; typical operating input up to 15V. A 10uF input decoupling capacitor (C1) to GND is recommended.
3	VOUT	power_out	Regulated 4.4V output (min 4.312V, typ 4.400V, max 4.488V at IOUT=10mA). Sources up to 150mA. A 10uF output capacitor (C2) to GND is recommended for stability.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

H7544-1TR
H7544-1TG
H7544-1PR
H7544-1PG
H7544-1NR
H7544-1NG

CAD (KiCad official)

Symbol: H7544-1
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Shanghai Siproin Microelectronics datasheet (12 pp, sha256 68d89a2084487dc3, 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