ICW3150ASPG from ICW, 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	NC	unconnected	No connect. Leave floating.
2	SW	output	Power MOSFET switching output. Connects to the external inductor and Schottky freewheeling diode of the buck converter. Absolute maximum voltage -0.3V to VIN.
3	GND	power_in	Ground reference for the IC.
4	FB	input	Voltage feedback pin. Senses output voltage via an external resistor divider. Internal reference is 1.25V; Vout = 1.25 × (1 + R2/R1).
5	CS	input	Current-sense pin for constant-current loop feedback. Senses the voltage drop across an external Rcs (typical CS threshold ~118 mV). Tie to GND when only the CV loop is used.
6	NC	unconnected	No connect. Leave floating.
7	VC	passive	Internal LDO bypass capacitor pin. Connect a bypass capacitor (typ. 1nF, adjustable 1~4nF for CC-loop stability) between VC (pin 7) and VIN (pin 8).
8	VIN	power_in	Input supply pin. Wide operating range 8V to 36V (absolute max 45V). Bypass to GND with 100µF/50V bulk plus 1µF (105) ceramic near the pin.
9	EP	power_in	Exposed thermal pad on package underside. Per the pin table, the backside pad is tied to the SW node (pin 2). Solder to a copper thermal-relief plane sized for heat dissipation; do NOT connect to GND.

Key specifications

Parameter	Value
Manufacturer	ICW
Package	ESOP-8
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

ICW3150ASPG

CAD (KiCad official)

Symbol: ICW3150ASPG
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: ICW datasheet (11 pp, sha256 dfe341afd68077f1, 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